--- /dev/null
+/*\r
+ FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.\r
+\r
+ ***************************************************************************\r
+ * *\r
+ * If you are: *\r
+ * *\r
+ * + New to FreeRTOS, *\r
+ * + Wanting to learn FreeRTOS or multitasking in general quickly *\r
+ * + Looking for basic training, *\r
+ * + Wanting to improve your FreeRTOS skills and productivity *\r
+ * *\r
+ * then take a look at the FreeRTOS books - available as PDF or paperback *\r
+ * *\r
+ * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *\r
+ * http://www.FreeRTOS.org/Documentation *\r
+ * *\r
+ * A pdf reference manual is also available. Both are usually delivered *\r
+ * to your inbox within 20 minutes to two hours when purchased between 8am *\r
+ * and 8pm GMT (although please allow up to 24 hours in case of *\r
+ * exceptional circumstances). Thank you for your support! *\r
+ * *\r
+ ***************************************************************************\r
+\r
+ This file is part of the FreeRTOS distribution.\r
+\r
+ FreeRTOS is free software; you can redistribute it and/or modify it under\r
+ the terms of the GNU General Public License (version 2) as published by the\r
+ Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
+ ***NOTE*** The exception to the GPL is included to allow you to distribute\r
+ a combined work that includes FreeRTOS without being obliged to provide the\r
+ source code for proprietary components outside of the FreeRTOS kernel.\r
+ FreeRTOS is distributed in the hope that it will be useful, but WITHOUT\r
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or\r
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for\r
+ more details. You should have received a copy of the GNU General Public\r
+ License and the FreeRTOS license exception along with FreeRTOS; if not it\r
+ can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
+ by writing to Richard Barry, contact details for whom are available on the\r
+ FreeRTOS WEB site.\r
+\r
+ 1 tab == 4 spaces!\r
+\r
+ http://www.FreeRTOS.org - Documentation, latest information, license and\r
+ contact details.\r
+\r
+ http://www.SafeRTOS.com - A version that is certified for use in safety\r
+ critical systems.\r
+\r
+ http://www.OpenRTOS.com - Commercial support, development, porting,\r
+ licensing and training services.\r
+*/\r
+\r
+/*\r
+ BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.\r
+*/\r
+\r
+/* Scheduler includes. */\r
+#include "FreeRTOS.h"\r
+#include "queue.h"\r
+#include "semphr.h"\r
+#include "comtest2.h"\r
+\r
+/* Library includes. */\r
+#include "stm32l152_eval.h"\r
+\r
+/* Demo application includes. */\r
+#include "serial.h"\r
+/*-----------------------------------------------------------*/\r
+\r
+/* Misc defines. */\r
+#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )\r
+#define serNO_BLOCK ( ( portTickType ) 0 )\r
+#define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )\r
+\r
+/*-----------------------------------------------------------*/\r
+\r
+/* The queue used to hold received characters. */\r
+static xQueueHandle xRxedChars;\r
+static xQueueHandle xCharsForTx;\r
+\r
+/*-----------------------------------------------------------*/\r
+\r
+/*\r
+ * See the serial2.h header file.\r
+ */\r
+xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )\r
+{\r
+USART_InitTypeDef USART_InitStructure;\r
+xComPortHandle xReturn;\r
+NVIC_InitTypeDef NVIC_InitStructure;\r
+\r
+ /* Create the queues used to hold Rx/Tx characters. */\r
+ xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );\r
+ xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );\r
+ \r
+ /* If the queue/semaphore was created correctly then setup the serial port\r
+ hardware. */\r
+ if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )\r
+ {\r
+ USART_InitStructure.USART_BaudRate = ulWantedBaud;\r
+ USART_InitStructure.USART_WordLength = USART_WordLength_8b;\r
+ USART_InitStructure.USART_StopBits = USART_StopBits_1;\r
+ USART_InitStructure.USART_Parity = USART_Parity_No;\r
+ USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;\r
+ USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;\r
+ \r
+ /* The Eval board COM2 is being used, which in reality is the STM32\r
+ USART3. */\r
+ STM_EVAL_COMInit( COM2, &USART_InitStructure );\r
+ \r
+ NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;\r
+ NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY;\r
+ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; /* Not used as 4 bits are used for the pre-emption priority. */;\r
+ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;\r
+ NVIC_Init( &NVIC_InitStructure );\r
+ USART_ITConfig( USART3, USART_IT_RXNE, ENABLE );\r
+ }\r
+ else\r
+ {\r
+ xReturn = ( xComPortHandle ) 0;\r
+ }\r
+\r
+ /* This demo file only supports a single port but we have to return\r
+ something to comply with the standard demo header file. */\r
+ return xReturn;\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )\r
+{\r
+ /* The port handle is not required as this driver only supports one port. */\r
+ ( void ) pxPort;\r
+\r
+ /* Get the next character from the buffer. Return false if no characters\r
+ are available, or arrive before xBlockTime expires. */\r
+ if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )\r
+ {\r
+ return pdTRUE;\r
+ }\r
+ else\r
+ {\r
+ return pdFALSE;\r
+ }\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )\r
+{\r
+signed portCHAR *pxNext;\r
+\r
+ /* A couple of parameters that this port does not use. */\r
+ ( void ) usStringLength;\r
+ ( void ) pxPort;\r
+\r
+ /* NOTE: This implementation does not handle the queue being full as no\r
+ block time is used! */\r
+\r
+ /* The port handle is not required as this driver only supports UART1. */\r
+ ( void ) pxPort;\r
+\r
+ /* Send each character in the string, one at a time. */\r
+ pxNext = ( signed portCHAR * ) pcString;\r
+ while( *pxNext )\r
+ {\r
+ xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );\r
+ pxNext++;\r
+ }\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )\r
+{\r
+signed portBASE_TYPE xReturn;\r
+\r
+ if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )\r
+ {\r
+ xReturn = pdPASS;\r
+ USART_ITConfig( USART3, USART_IT_TXE, ENABLE );\r
+ }\r
+ else\r
+ {\r
+ xReturn = pdFAIL;\r
+ }\r
+\r
+ return xReturn;\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+void vSerialClose( xComPortHandle xPort )\r
+{\r
+ /* Not supported as not required by the demo application. */\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+void USART3_IRQHandler( void )\r
+{\r
+portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;\r
+portCHAR cChar;\r
+\r
+ if( USART_GetITStatus( USART3, USART_IT_TXE ) == SET )\r
+ {\r
+ /* The interrupt was caused by the THR becoming empty. Are there any\r
+ more characters to transmit? */\r
+ if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )\r
+ {\r
+ /* A character was retrieved from the queue so can be sent to the\r
+ THR now. */\r
+ USART_SendData( USART3, cChar );\r
+ }\r
+ else\r
+ {\r
+ USART_ITConfig( USART3, USART_IT_TXE, DISABLE ); \r
+ } \r
+ }\r
+ \r
+ if( USART_GetITStatus( USART3, USART_IT_RXNE ) == SET )\r
+ {\r
+ cChar = USART_ReceiveData( USART3 );\r
+ xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );\r
+ } \r
+\r
+ portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );\r
+}\r
+\r
+\r
+\r
+\r
+\r
+ \r
--- /dev/null
+/**\r
+ ******************************************************************************\r
+ * @file stm32l1xx_usart.h\r
+ * @author MCD Application Team\r
+ * @version V1.0.0RC1\r
+ * @date 07/02/2010\r
+ * @brief This file contains all the functions prototypes for the USART \r
+ * firmware library.\r
+ ******************************************************************************\r
+ * @copy\r
+ *\r
+ * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS\r
+ * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE\r
+ * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY\r
+ * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING\r
+ * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE\r
+ * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.\r
+ *\r
+ * <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>\r
+ */ \r
+\r
+/* Define to prevent recursive inclusion -------------------------------------*/\r
+#ifndef __STM32L1xx_USART_H\r
+#define __STM32L1xx_USART_H\r
+\r
+#ifdef __cplusplus\r
+ extern "C" {\r
+#endif\r
+\r
+/* Includes ------------------------------------------------------------------*/\r
+#include "stm32l1xx.h"\r
+\r
+/** @addtogroup STM32L1xx_StdPeriph_Driver\r
+ * @{\r
+ */\r
+\r
+/** @addtogroup USART\r
+ * @{\r
+ */ \r
+\r
+/** @defgroup USART_Exported_Types\r
+ * @{\r
+ */ \r
+\r
+/** \r
+ * @brief USART Init Structure definition \r
+ */ \r
+ \r
+typedef struct\r
+{\r
+ uint32_t USART_BaudRate; /*!< This member configures the USART communication baud rate.\r
+ The baud rate is computed using the following formula:\r
+ - IntegerDivider = ((PCLKx) / (16 * (USART_InitStruct->USART_BaudRate)))\r
+ - FractionalDivider = ((IntegerDivider - ((u32) IntegerDivider)) * 16) + 0.5 */\r
+\r
+ uint16_t USART_WordLength; /*!< Specifies the number of data bits transmitted or received in a frame.\r
+ This parameter can be a value of @ref USART_Word_Length */\r
+\r
+ uint16_t USART_StopBits; /*!< Specifies the number of stop bits transmitted.\r
+ This parameter can be a value of @ref USART_Stop_Bits */\r
+\r
+ uint16_t USART_Parity; /*!< Specifies the parity mode.\r
+ This parameter can be a value of @ref USART_Parity\r
+ @note When parity is enabled, the computed parity is inserted\r
+ at the MSB position of the transmitted data (9th bit when\r
+ the word length is set to 9 data bits; 8th bit when the\r
+ word length is set to 8 data bits). */\r
+ \r
+ uint16_t USART_Mode; /*!< Specifies wether the Receive or Transmit mode is enabled or disabled.\r
+ This parameter can be a value of @ref USART_Mode */\r
+\r
+ uint16_t USART_HardwareFlowControl; /*!< Specifies wether the hardware flow control mode is enabled\r
+ or disabled.\r
+ This parameter can be a value of @ref USART_Hardware_Flow_Control */\r
+} USART_InitTypeDef;\r
+\r
+/** \r
+ * @brief USART Clock Init Structure definition \r
+ */ \r
+ \r
+typedef struct\r
+{\r
+\r
+ uint16_t USART_Clock; /*!< Specifies whether the USART clock is enabled or disabled.\r
+ This parameter can be a value of @ref USART_Clock */\r
+\r
+ uint16_t USART_CPOL; /*!< Specifies the steady state value of the serial clock.\r
+ This parameter can be a value of @ref USART_Clock_Polarity */\r
+\r
+ uint16_t USART_CPHA; /*!< Specifies the clock transition on which the bit capture is made.\r
+ This parameter can be a value of @ref USART_Clock_Phase */\r
+\r
+ uint16_t USART_LastBit; /*!< Specifies whether the clock pulse corresponding to the last transmitted\r
+ data bit (MSB) has to be output on the SCLK pin in synchronous mode.\r
+ This parameter can be a value of @ref USART_Last_Bit */\r
+} USART_ClockInitTypeDef;\r
+\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Exported_Constants\r
+ * @{\r
+ */ \r
+ \r
+#define IS_USART_ALL_PERIPH(PERIPH) (((PERIPH) == USART1) || \\r
+ ((PERIPH) == USART2) || \\r
+ ((PERIPH) == USART3))\r
+\r
+/** @defgroup USART_Word_Length \r
+ * @{\r
+ */ \r
+ \r
+#define USART_WordLength_8b ((uint16_t)0x0000)\r
+#define USART_WordLength_9b ((uint16_t)0x1000)\r
+ \r
+#define IS_USART_WORD_LENGTH(LENGTH) (((LENGTH) == USART_WordLength_8b) || \\r
+ ((LENGTH) == USART_WordLength_9b))\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Stop_Bits \r
+ * @{\r
+ */ \r
+ \r
+#define USART_StopBits_1 ((uint16_t)0x0000)\r
+#define USART_StopBits_0_5 ((uint16_t)0x1000)\r
+#define USART_StopBits_2 ((uint16_t)0x2000)\r
+#define USART_StopBits_1_5 ((uint16_t)0x3000)\r
+#define IS_USART_STOPBITS(STOPBITS) (((STOPBITS) == USART_StopBits_1) || \\r
+ ((STOPBITS) == USART_StopBits_0_5) || \\r
+ ((STOPBITS) == USART_StopBits_2) || \\r
+ ((STOPBITS) == USART_StopBits_1_5))\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Parity \r
+ * @{\r
+ */ \r
+ \r
+#define USART_Parity_No ((uint16_t)0x0000)\r
+#define USART_Parity_Even ((uint16_t)0x0400)\r
+#define USART_Parity_Odd ((uint16_t)0x0600) \r
+#define IS_USART_PARITY(PARITY) (((PARITY) == USART_Parity_No) || \\r
+ ((PARITY) == USART_Parity_Even) || \\r
+ ((PARITY) == USART_Parity_Odd))\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Mode \r
+ * @{\r
+ */ \r
+ \r
+#define USART_Mode_Rx ((uint16_t)0x0004)\r
+#define USART_Mode_Tx ((uint16_t)0x0008)\r
+#define IS_USART_MODE(MODE) ((((MODE) & (uint16_t)0xFFF3) == 0x00) && ((MODE) != (uint16_t)0x00))\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Hardware_Flow_Control \r
+ * @{\r
+ */ \r
+#define USART_HardwareFlowControl_None ((uint16_t)0x0000)\r
+#define USART_HardwareFlowControl_RTS ((uint16_t)0x0100)\r
+#define USART_HardwareFlowControl_CTS ((uint16_t)0x0200)\r
+#define USART_HardwareFlowControl_RTS_CTS ((uint16_t)0x0300)\r
+#define IS_USART_HARDWARE_FLOW_CONTROL(CONTROL)\\r
+ (((CONTROL) == USART_HardwareFlowControl_None) || \\r
+ ((CONTROL) == USART_HardwareFlowControl_RTS) || \\r
+ ((CONTROL) == USART_HardwareFlowControl_CTS) || \\r
+ ((CONTROL) == USART_HardwareFlowControl_RTS_CTS))\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Clock \r
+ * @{\r
+ */ \r
+#define USART_Clock_Disable ((uint16_t)0x0000)\r
+#define USART_Clock_Enable ((uint16_t)0x0800)\r
+#define IS_USART_CLOCK(CLOCK) (((CLOCK) == USART_Clock_Disable) || \\r
+ ((CLOCK) == USART_Clock_Enable))\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Clock_Polarity \r
+ * @{\r
+ */\r
+ \r
+#define USART_CPOL_Low ((uint16_t)0x0000)\r
+#define USART_CPOL_High ((uint16_t)0x0400)\r
+#define IS_USART_CPOL(CPOL) (((CPOL) == USART_CPOL_Low) || ((CPOL) == USART_CPOL_High))\r
+\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Clock_Phase\r
+ * @{\r
+ */\r
+\r
+#define USART_CPHA_1Edge ((uint16_t)0x0000)\r
+#define USART_CPHA_2Edge ((uint16_t)0x0200)\r
+#define IS_USART_CPHA(CPHA) (((CPHA) == USART_CPHA_1Edge) || ((CPHA) == USART_CPHA_2Edge))\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_Last_Bit\r
+ * @{\r
+ */\r
+\r
+#define USART_LastBit_Disable ((uint16_t)0x0000)\r
+#define USART_LastBit_Enable ((uint16_t)0x0100)\r
+#define IS_USART_LASTBIT(LASTBIT) (((LASTBIT) == USART_LastBit_Disable) || \\r
+ ((LASTBIT) == USART_LastBit_Enable))\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Interrupt_definition \r
+ * @{\r
+ */\r
+ \r
+#define USART_IT_PE ((uint16_t)0x0028)\r
+#define USART_IT_TXE ((uint16_t)0x0727)\r
+#define USART_IT_TC ((uint16_t)0x0626)\r
+#define USART_IT_RXNE ((uint16_t)0x0525)\r
+#define USART_IT_IDLE ((uint16_t)0x0424)\r
+#define USART_IT_LBD ((uint16_t)0x0846)\r
+#define USART_IT_CTS ((uint16_t)0x096A)\r
+#define USART_IT_ERR ((uint16_t)0x0060)\r
+#define USART_IT_ORE ((uint16_t)0x0360)\r
+#define USART_IT_NE ((uint16_t)0x0260)\r
+#define USART_IT_FE ((uint16_t)0x0160)\r
+#define IS_USART_CONFIG_IT(IT) (((IT) == USART_IT_PE) || ((IT) == USART_IT_TXE) || \\r
+ ((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \\r
+ ((IT) == USART_IT_IDLE) || ((IT) == USART_IT_LBD) || \\r
+ ((IT) == USART_IT_CTS) || ((IT) == USART_IT_ERR))\r
+#define IS_USART_GET_IT(IT) (((IT) == USART_IT_PE) || ((IT) == USART_IT_TXE) || \\r
+ ((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \\r
+ ((IT) == USART_IT_IDLE) || ((IT) == USART_IT_LBD) || \\r
+ ((IT) == USART_IT_CTS) || ((IT) == USART_IT_ORE) || \\r
+ ((IT) == USART_IT_NE) || ((IT) == USART_IT_FE))\r
+#define IS_USART_CLEAR_IT(IT) (((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \\r
+ ((IT) == USART_IT_LBD) || ((IT) == USART_IT_CTS))\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_DMA_Requests \r
+ * @{\r
+ */\r
+\r
+#define USART_DMAReq_Tx ((uint16_t)0x0080)\r
+#define USART_DMAReq_Rx ((uint16_t)0x0040)\r
+#define IS_USART_DMAREQ(DMAREQ) ((((DMAREQ) & (uint16_t)0xFF3F) == 0x00) && ((DMAREQ) != (uint16_t)0x00))\r
+\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_WakeUp_methods\r
+ * @{\r
+ */\r
+\r
+#define USART_WakeUp_IdleLine ((uint16_t)0x0000)\r
+#define USART_WakeUp_AddressMark ((uint16_t)0x0800)\r
+#define IS_USART_WAKEUP(WAKEUP) (((WAKEUP) == USART_WakeUp_IdleLine) || \\r
+ ((WAKEUP) == USART_WakeUp_AddressMark))\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_LIN_Break_Detection_Length \r
+ * @{\r
+ */\r
+ \r
+#define USART_LINBreakDetectLength_10b ((uint16_t)0x0000)\r
+#define USART_LINBreakDetectLength_11b ((uint16_t)0x0020)\r
+#define IS_USART_LIN_BREAK_DETECT_LENGTH(LENGTH) \\r
+ (((LENGTH) == USART_LINBreakDetectLength_10b) || \\r
+ ((LENGTH) == USART_LINBreakDetectLength_11b))\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_IrDA_Low_Power \r
+ * @{\r
+ */\r
+\r
+#define USART_IrDAMode_LowPower ((uint16_t)0x0004)\r
+#define USART_IrDAMode_Normal ((uint16_t)0x0000)\r
+#define IS_USART_IRDA_MODE(MODE) (((MODE) == USART_IrDAMode_LowPower) || \\r
+ ((MODE) == USART_IrDAMode_Normal))\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Flags \r
+ * @{\r
+ */\r
+\r
+#define USART_FLAG_CTS ((uint16_t)0x0200)\r
+#define USART_FLAG_LBD ((uint16_t)0x0100)\r
+#define USART_FLAG_TXE ((uint16_t)0x0080)\r
+#define USART_FLAG_TC ((uint16_t)0x0040)\r
+#define USART_FLAG_RXNE ((uint16_t)0x0020)\r
+#define USART_FLAG_IDLE ((uint16_t)0x0010)\r
+#define USART_FLAG_ORE ((uint16_t)0x0008)\r
+#define USART_FLAG_NE ((uint16_t)0x0004)\r
+#define USART_FLAG_FE ((uint16_t)0x0002)\r
+#define USART_FLAG_PE ((uint16_t)0x0001)\r
+#define IS_USART_FLAG(FLAG) (((FLAG) == USART_FLAG_PE) || ((FLAG) == USART_FLAG_TXE) || \\r
+ ((FLAG) == USART_FLAG_TC) || ((FLAG) == USART_FLAG_RXNE) || \\r
+ ((FLAG) == USART_FLAG_IDLE) || ((FLAG) == USART_FLAG_LBD) || \\r
+ ((FLAG) == USART_FLAG_CTS) || ((FLAG) == USART_FLAG_ORE) || \\r
+ ((FLAG) == USART_FLAG_NE) || ((FLAG) == USART_FLAG_FE))\r
+ \r
+#define IS_USART_CLEAR_FLAG(FLAG) ((((FLAG) & (uint16_t)0xFC9F) == 0x00) && ((FLAG) != (uint16_t)0x00))\r
+\r
+#define IS_USART_BAUDRATE(BAUDRATE) (((BAUDRATE) > 0) && ((BAUDRATE) < 0x003D0901))\r
+#define IS_USART_ADDRESS(ADDRESS) ((ADDRESS) <= 0xF)\r
+#define IS_USART_DATA(DATA) ((DATA) <= 0x1FF)\r
+\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Exported_Macros\r
+ * @{\r
+ */ \r
+\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/** @defgroup USART_Exported_Functions\r
+ * @{\r
+ */\r
+\r
+void USART_DeInit(USART_TypeDef* USARTx);\r
+void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct);\r
+void USART_StructInit(USART_InitTypeDef* USART_InitStruct);\r
+void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct);\r
+void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct);\r
+void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);\r
+void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);\r
+void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address);\r
+void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp);\r
+void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength);\r
+void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+void USART_SendData(USART_TypeDef* USARTx, uint16_t Data);\r
+uint16_t USART_ReceiveData(USART_TypeDef* USARTx);\r
+void USART_SendBreak(USART_TypeDef* USARTx);\r
+void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime);\r
+void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler);\r
+void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode);\r
+void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState);\r
+FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG);\r
+void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG);\r
+ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT);\r
+void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT);\r
+\r
+#ifdef __cplusplus\r
+}\r
+#endif\r
+\r
+#endif /* __STM32L1xx_USART_H */\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/**\r
+ * @}\r
+ */ \r
+\r
+/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/\r
--- /dev/null
+/**\r
+ ******************************************************************************\r
+ * @file stm32l1xx_usart.c\r
+ * @author MCD Application Team\r
+ * @version V1.0.0RC1\r
+ * @date 07/02/2010\r
+ * @brief This file provides all the USART firmware functions.\r
+ ******************************************************************************\r
+ * @copy\r
+ *\r
+ * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS\r
+ * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE\r
+ * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY\r
+ * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING\r
+ * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE\r
+ * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.\r
+ *\r
+ * <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>\r
+ */ \r
+\r
+/* Includes ------------------------------------------------------------------*/\r
+#include "stm32l1xx_usart.h"\r
+#include "stm32l1xx_rcc.h"\r
+\r
+/** @addtogroup STM32L1xx_StdPeriph_Driver\r
+ * @{\r
+ */\r
+\r
+/** @defgroup USART \r
+ * @brief USART driver modules\r
+ * @{\r
+ */\r
+\r
+/** @defgroup USART_Private_TypesDefinitions\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_Private_Defines\r
+ * @{\r
+ */\r
+\r
+/*!< USART CR1 register clear Mask ((~(uint16_t)0xE9F3)) */\r
+#define CR1_CLEAR_MASK ((uint16_t)(USART_CR1_M | USART_CR1_PCE | \\r
+ USART_CR1_PS | USART_CR1_TE | \\r
+ USART_CR1_RE))\r
+\r
+/*!< USART CR2 register clock bits clear Mask ((~(uint16_t)0xF0FF)) */\r
+#define CR2_CLOCK_CLEAR_MASK ((uint16_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \\r
+ USART_CR2_CPHA | USART_CR2_LBCL))\r
+\r
+/*!< USART CR3 register clear Mask ((~(uint16_t)0xFCFF)) */\r
+#define CR3_CLEAR_MASK ((uint16_t)(USART_CR3_RTSE | USART_CR3_CTSE))\r
+\r
+/*!< USART Interrupts mask */\r
+#define IT_MASK ((uint16_t)0x001F)\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_Private_Macros\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_Private_Variables\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_Private_FunctionPrototypes\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup USART_Private_Functions\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @brief Deinitializes the USARTx peripheral registers to their default reset values.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values: USART1, USART2 or USART3.\r
+ * @retval None\r
+ */\r
+void USART_DeInit(USART_TypeDef* USARTx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+\r
+ if (USARTx == USART1)\r
+ {\r
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);\r
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);\r
+ }\r
+ else if (USARTx == USART2)\r
+ {\r
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);\r
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);\r
+ }\r
+ else \r
+ {\r
+ if (USARTx == USART3)\r
+ {\r
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);\r
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE); \r
+ }\r
+ } \r
+}\r
+\r
+/**\r
+ * @brief Initializes the USARTx peripheral according to the specified\r
+ * parameters in the USART_InitStruct .\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_InitStruct: pointer to a USART_InitTypeDef structure\r
+ * that contains the configuration information for the specified USART peripheral.\r
+ * @retval None\r
+ */\r
+void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)\r
+{\r
+ uint32_t tmpreg = 0x00, apbclock = 0x00;\r
+ uint32_t integerdivider = 0x00;\r
+ uint32_t fractionaldivider = 0x00;\r
+ RCC_ClocksTypeDef RCC_ClocksStatus;\r
+\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate)); \r
+ assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));\r
+ assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));\r
+ assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));\r
+ assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));\r
+ assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));\r
+ \r
+/*---------------------------- USART CR2 Configuration -----------------------*/\r
+ tmpreg = USARTx->CR2;\r
+ /* Clear STOP[13:12] bits */\r
+ tmpreg &= (uint32_t)~((uint32_t)USART_CR2_STOP);\r
+\r
+ /* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/\r
+ /* Set STOP[13:12] bits according to USART_StopBits value */\r
+ tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;\r
+ \r
+ /* Write to USART CR2 */\r
+ USARTx->CR2 = (uint16_t)tmpreg;\r
+\r
+/*---------------------------- USART CR1 Configuration -----------------------*/\r
+ tmpreg = USARTx->CR1;\r
+ /* Clear M, PCE, PS, TE and RE bits */\r
+ tmpreg &= (uint32_t)~((uint32_t)CR1_CLEAR_MASK);\r
+\r
+ /* Configure the USART Word Length, Parity and mode ----------------------- */\r
+ /* Set the M bits according to USART_WordLength value */\r
+ /* Set PCE and PS bits according to USART_Parity value */\r
+ /* Set TE and RE bits according to USART_Mode value */\r
+ tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |\r
+ USART_InitStruct->USART_Mode;\r
+\r
+ /* Write to USART CR1 */\r
+ USARTx->CR1 = (uint16_t)tmpreg;\r
+\r
+/*---------------------------- USART CR3 Configuration -----------------------*/ \r
+ tmpreg = USARTx->CR3;\r
+ /* Clear CTSE and RTSE bits */\r
+ tmpreg &= (uint32_t)~((uint32_t)CR3_CLEAR_MASK);\r
+\r
+ /* Configure the USART HFC -------------------------------------------------*/\r
+ /* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */\r
+ tmpreg |= USART_InitStruct->USART_HardwareFlowControl;\r
+\r
+ /* Write to USART CR3 */\r
+ USARTx->CR3 = (uint16_t)tmpreg;\r
+\r
+/*---------------------------- USART BRR Configuration -----------------------*/\r
+ /* Configure the USART Baud Rate -------------------------------------------*/\r
+ RCC_GetClocksFreq(&RCC_ClocksStatus);\r
+ if (USARTx == USART1) \r
+ {\r
+ apbclock = RCC_ClocksStatus.PCLK2_Frequency;\r
+ }\r
+ else\r
+ {\r
+ apbclock = RCC_ClocksStatus.PCLK1_Frequency;\r
+ }\r
+\r
+ /* Determine the integer part */\r
+ if ((USARTx->CR1 & USART_CR1_OVER8) != 0)\r
+ {\r
+ /* Integer part computing in case Oversampling mode is 8 Samples */\r
+ integerdivider = ((25 * apbclock) / (2 * (USART_InitStruct->USART_BaudRate))); \r
+ }\r
+ else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */\r
+ {\r
+ /* Integer part computing in case Oversampling mode is 16 Samples */\r
+ integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate))); \r
+ }\r
+ tmpreg = (integerdivider / 100) << 4;\r
+\r
+ /* Determine the fractional part */\r
+ fractionaldivider = integerdivider - (100 * (tmpreg >> 4));\r
+\r
+ /* Implement the fractional part in the register */\r
+ if ((USARTx->CR1 & USART_CR1_OVER8) != 0)\r
+ {\r
+ tmpreg |= ((((fractionaldivider * 8) + 50) / 100)) & ((uint8_t)0x07);\r
+ }\r
+ else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */\r
+ {\r
+ tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);\r
+ }\r
+ \r
+ /* Write to USART BRR */\r
+ USARTx->BRR = (uint16_t)tmpreg;\r
+}\r
+\r
+/**\r
+ * @brief Fills each USART_InitStruct member with its default value.\r
+ * @param USART_InitStruct: pointer to a USART_InitTypeDef structure\r
+ * which will be initialized.\r
+ * @retval None\r
+ */\r
+void USART_StructInit(USART_InitTypeDef* USART_InitStruct)\r
+{\r
+ /* USART_InitStruct members default value */\r
+ USART_InitStruct->USART_BaudRate = 9600;\r
+ USART_InitStruct->USART_WordLength = USART_WordLength_8b;\r
+ USART_InitStruct->USART_StopBits = USART_StopBits_1;\r
+ USART_InitStruct->USART_Parity = USART_Parity_No ;\r
+ USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;\r
+ USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None; \r
+}\r
+\r
+/**\r
+ * @brief Initializes the USARTx peripheral Clock according to the \r
+ * specified parameters in the USART_ClockInitStruct .\r
+ * @param USARTx: where x can be 1, 2, 3 to select the USART peripheral.\r
+ * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef\r
+ * structure that contains the configuration information for the specified \r
+ * USART peripheral. \r
+ * @retval None\r
+ */\r
+void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)\r
+{\r
+ uint32_t tmpreg = 0x00;\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));\r
+ assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));\r
+ assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));\r
+ assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));\r
+ \r
+/*---------------------------- USART CR2 Configuration -----------------------*/\r
+ tmpreg = USARTx->CR2;\r
+ /* Clear CLKEN, CPOL, CPHA and LBCL bits */\r
+ tmpreg &= (uint32_t)~((uint32_t)CR2_CLOCK_CLEAR_MASK);\r
+ /* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/\r
+ /* Set CLKEN bit according to USART_Clock value */\r
+ /* Set CPOL bit according to USART_CPOL value */\r
+ /* Set CPHA bit according to USART_CPHA value */\r
+ /* Set LBCL bit according to USART_LastBit value */\r
+ tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL | \r
+ USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;\r
+ /* Write to USART CR2 */\r
+ USARTx->CR2 = (uint16_t)tmpreg;\r
+}\r
+\r
+/**\r
+ * @brief Fills each USART_ClockInitStruct member with its default value.\r
+ * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef\r
+ * structure which will be initialized.\r
+ * @retval None\r
+ */\r
+void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)\r
+{\r
+ /* USART_ClockInitStruct members default value */\r
+ USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;\r
+ USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;\r
+ USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;\r
+ USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified USART peripheral.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param NewState: new state of the USARTx peripheral.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ \r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the selected USART by setting the UE bit in the CR1 register */\r
+ USARTx->CR1 |= USART_CR1_UE;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the selected USART by clearing the UE bit in the CR1 register */\r
+ USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_UE);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified USART interrupts.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_IT: specifies the USART interrupt sources to be enabled or disabled.\r
+ * This parameter can be one of the following values:\r
+ * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)\r
+ * @arg USART_IT_LBD: LIN Break detection interrupt\r
+ * @arg USART_IT_TXE: Tansmit Data Register empty interrupt\r
+ * @arg USART_IT_TC: Transmission complete interrupt\r
+ * @arg USART_IT_RXNE: Receive Data register not empty interrupt\r
+ * @arg USART_IT_IDLE: Idle line detection interrupt\r
+ * @arg USART_IT_PE: Parity Error interrupt\r
+ * @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)\r
+ * @param NewState: new state of the specified USARTx interrupts.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState)\r
+{\r
+ uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00;\r
+ uint32_t usartxbase = 0x00;\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_CONFIG_IT(USART_IT));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ \r
+ usartxbase = (uint32_t)USARTx;\r
+\r
+ /* Get the USART register index */\r
+ usartreg = (((uint8_t)USART_IT) >> 0x05);\r
+\r
+ /* Get the interrupt position */\r
+ itpos = USART_IT & IT_MASK;\r
+ itmask = (((uint32_t)0x01) << itpos);\r
+ \r
+ if (usartreg == 0x01) /* The IT is in CR1 register */\r
+ {\r
+ usartxbase += 0x0C;\r
+ }\r
+ else if (usartreg == 0x02) /* The IT is in CR2 register */\r
+ {\r
+ usartxbase += 0x10;\r
+ }\r
+ else /* The IT is in CR3 register */\r
+ {\r
+ usartxbase += 0x14; \r
+ }\r
+ if (NewState != DISABLE)\r
+ {\r
+ *(__IO uint32_t*)usartxbase |= itmask;\r
+ }\r
+ else\r
+ {\r
+ *(__IO uint32_t*)usartxbase &= ~itmask;\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the USART\92s DMA interface.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_DMAReq: specifies the DMA request.\r
+ * This parameter can be any combination of the following values:\r
+ * @arg USART_DMAReq_Tx: USART DMA transmit request\r
+ * @arg USART_DMAReq_Rx: USART DMA receive request\r
+ * @param NewState: new state of the DMA Request sources.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @note The DMA mode is not available for UART5. \r
+ * @retval None\r
+ */\r
+void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_DMAREQ(USART_DMAReq)); \r
+ assert_param(IS_FUNCTIONAL_STATE(NewState)); \r
+\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the DMA transfer for selected requests by setting the DMAT and/or\r
+ DMAR bits in the USART CR3 register */\r
+ USARTx->CR3 |= USART_DMAReq;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the DMA transfer for selected requests by clearing the DMAT and/or\r
+ DMAR bits in the USART CR3 register */\r
+ USARTx->CR3 &= (uint16_t)~USART_DMAReq;\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Sets the address of the USART node.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_Address: Indicates the address of the USART node.\r
+ * @retval None\r
+ */\r
+void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_ADDRESS(USART_Address)); \r
+ \r
+ /* Clear the USART address */\r
+ USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_ADD);\r
+ /* Set the USART address node */\r
+ USARTx->CR2 |= USART_Address;\r
+}\r
+\r
+/**\r
+ * @brief Selects the USART WakeUp method.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_WakeUp: specifies the USART wakeup method.\r
+ * This parameter can be one of the following values:\r
+ * @arg USART_WakeUp_IdleLine: WakeUp by an idle line detection\r
+ * @arg USART_WakeUp_AddressMark: WakeUp by an address mark\r
+ * @retval None\r
+ */\r
+void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_WAKEUP(USART_WakeUp));\r
+ \r
+ USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_WAKE);\r
+ USARTx->CR1 |= USART_WakeUp;\r
+}\r
+\r
+/**\r
+ * @brief Determines if the USART is in mute mode or not.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param NewState: new state of the USART mute mode.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState)); \r
+ \r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the USART mute mode by setting the RWU bit in the CR1 register */\r
+ USARTx->CR1 |= USART_CR1_RWU;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the USART mute mode by clearing the RWU bit in the CR1 register */\r
+ USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_RWU);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Sets the USART LIN Break detection length.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_LINBreakDetectLength: specifies the LIN break detection length.\r
+ * This parameter can be one of the following values:\r
+ * @arg USART_LINBreakDetectLength_10b: 10-bit break detection\r
+ * @arg USART_LINBreakDetectLength_11b: 11-bit break detection\r
+ * @retval None\r
+ */\r
+void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));\r
+ \r
+ USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LBDL);\r
+ USARTx->CR2 |= USART_LINBreakDetectLength; \r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the USART\92s LIN mode.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param NewState: new state of the USART LIN mode.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ \r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the LIN mode by setting the LINEN bit in the CR2 register */\r
+ USARTx->CR2 |= USART_CR2_LINEN;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the LIN mode by clearing the LINEN bit in the CR2 register */\r
+ USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LINEN);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Transmits single data through the USARTx peripheral.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param Data: the data to transmit.\r
+ * @retval None\r
+ */\r
+void USART_SendData(USART_TypeDef* USARTx, uint16_t Data)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_DATA(Data)); \r
+ \r
+ /* Transmit Data */\r
+ USARTx->DR = (Data & (uint16_t)0x01FF);\r
+}\r
+\r
+/**\r
+ * @brief Returns the most recent received data by the USARTx peripheral.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @retval The received data.\r
+ */\r
+uint16_t USART_ReceiveData(USART_TypeDef* USARTx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ \r
+ /* Receive Data */\r
+ return (uint16_t)(USARTx->DR & (uint16_t)0x01FF);\r
+}\r
+\r
+/**\r
+ * @brief Transmits break characters.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @retval None\r
+ */\r
+void USART_SendBreak(USART_TypeDef* USARTx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ \r
+ /* Send break characters */\r
+ USARTx->CR1 |= USART_CR1_SBK;\r
+}\r
+\r
+/**\r
+ * @brief Sets the specified USART guard time.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_GuardTime: specifies the guard time.\r
+ * @note The guard time bits are not available for UART4 and UART5. \r
+ * @retval None\r
+ */\r
+void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime)\r
+{ \r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ \r
+ /* Clear the USART Guard time */\r
+ USARTx->GTPR &= USART_GTPR_PSC;\r
+ /* Set the USART guard time */\r
+ USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);\r
+}\r
+\r
+/**\r
+ * @brief Sets the system clock prescaler.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_Prescaler: specifies the prescaler clock. \r
+ * @note The function is used for IrDA mode with UART4 and UART5.\r
+ * @retval None\r
+ */\r
+void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler)\r
+{ \r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ \r
+ /* Clear the USART prescaler */\r
+ USARTx->GTPR &= USART_GTPR_GT;\r
+ /* Set the USART prescaler */\r
+ USARTx->GTPR |= USART_Prescaler;\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the USART\92s Smart Card mode.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param NewState: new state of the Smart Card mode.\r
+ * This parameter can be: ENABLE or DISABLE. \r
+ * @note The Smart Card mode is not available for UART4 and UART5. \r
+ * @retval None\r
+ */\r
+void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the SC mode by setting the SCEN bit in the CR3 register */\r
+ USARTx->CR3 |= USART_CR3_SCEN;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the SC mode by clearing the SCEN bit in the CR3 register */\r
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_SCEN);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables NACK transmission.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param NewState: new state of the NACK transmission.\r
+ * This parameter can be: ENABLE or DISABLE. \r
+ * @note The Smart Card mode is not available for UART4 and UART5.\r
+ * @retval None\r
+ */\r
+void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx)); \r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the NACK transmission by setting the NACK bit in the CR3 register */\r
+ USARTx->CR3 |= USART_CR3_NACK;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the NACK transmission by clearing the NACK bit in the CR3 register */\r
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_NACK);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the USART\92s Half Duplex communication.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param NewState: new state of the USART Communication.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ \r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */\r
+ USARTx->CR3 |= USART_CR3_HDSEL;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */\r
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_HDSEL);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the USART's 8x oversampling mode.\r
+ * @param USARTx: Select the USART or the UART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2, USART3.\r
+ * @param NewState: new state of the USART 8x oversampling mode.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ *\r
+ * @note\r
+ * This function has to be called before calling USART_Init()\r
+ * function in order to have correct baudrate Divider value.\r
+ * @retval : None\r
+ */\r
+void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ \r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the 8x Oversampling mode by setting the OVER8 bit in the CR1 register */\r
+ USARTx->CR1 |= USART_CR1_OVER8;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */\r
+ USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_OVER8);\r
+ }\r
+} \r
+\r
+/**\r
+ * @brief Enables or disables the USART's one bit sampling methode.\r
+ * @param USARTx: Select the USART or the UART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2, USART3.\r
+ * @param NewState: new state of the USART one bit sampling methode.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval : None\r
+ */\r
+void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ \r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the one bit method by setting the ONEBITE bit in the CR3 register */\r
+ USARTx->CR3 |= USART_CR3_ONEBIT;\r
+ }\r
+ else\r
+ {\r
+ /* Disable tthe one bit method by clearing the ONEBITE bit in the CR3 register */\r
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_ONEBIT);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Configures the USART\92s IrDA interface.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_IrDAMode: specifies the IrDA mode.\r
+ * This parameter can be one of the following values:\r
+ * @arg USART_IrDAMode_LowPower\r
+ * @arg USART_IrDAMode_Normal\r
+ * @retval None\r
+ */\r
+void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));\r
+ \r
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IRLP);\r
+ USARTx->CR3 |= USART_IrDAMode;\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the USART\92s IrDA interface.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param NewState: new state of the IrDA mode.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ \r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the IrDA mode by setting the IREN bit in the CR3 register */\r
+ USARTx->CR3 |= USART_CR3_IREN;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the IrDA mode by clearing the IREN bit in the CR3 register */\r
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IREN);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Checks whether the specified USART flag is set or not.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_FLAG: specifies the flag to check.\r
+ * This parameter can be one of the following values:\r
+ * @arg USART_FLAG_CTS: CTS Change flag\r
+ * @arg USART_FLAG_LBD: LIN Break detection flag\r
+ * @arg USART_FLAG_TXE: Transmit data register empty flag\r
+ * @arg USART_FLAG_TC: Transmission Complete flag\r
+ * @arg USART_FLAG_RXNE: Receive data register not empty flag\r
+ * @arg USART_FLAG_IDLE: Idle Line detection flag\r
+ * @arg USART_FLAG_ORE: OverRun Error flag\r
+ * @arg USART_FLAG_NE: Noise Error flag\r
+ * @arg USART_FLAG_FE: Framing Error flag\r
+ * @arg USART_FLAG_PE: Parity Error flag\r
+ * @retval The new state of USART_FLAG (SET or RESET).\r
+ */\r
+FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG)\r
+{\r
+ FlagStatus bitstatus = RESET;\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_FLAG(USART_FLAG));\r
+ \r
+ if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET)\r
+ {\r
+ bitstatus = SET;\r
+ }\r
+ else\r
+ {\r
+ bitstatus = RESET;\r
+ }\r
+ return bitstatus;\r
+}\r
+\r
+/**\r
+ * @brief Clears the USARTx's pending flags.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_FLAG: specifies the flag to clear.\r
+ * This parameter can be any combination of the following values:\r
+ * @arg USART_FLAG_CTS: CTS Change flag.\r
+ * @arg USART_FLAG_LBD: LIN Break detection flag.\r
+ * @arg USART_FLAG_TC: Transmission Complete flag.\r
+ * @arg USART_FLAG_RXNE: Receive data register not empty flag.\r
+ * \r
+ * @note\r
+ * - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun \r
+ * error) and IDLE (Idle line detected) flags are cleared by software \r
+ * sequence: a read operation to USART_SR register (USART_GetFlagStatus()) \r
+ * followed by a read operation to USART_DR register (USART_ReceiveData()).\r
+ * - RXNE flag can be also cleared by a read to the USART_DR register \r
+ * (USART_ReceiveData()).\r
+ * - TC flag can be also cleared by software sequence: a read operation to \r
+ * USART_SR register (USART_GetFlagStatus()) followed by a write operation\r
+ * to USART_DR register (USART_SendData()).\r
+ * - TXE flag is cleared only by a write to the USART_DR register \r
+ * (USART_SendData()).\r
+ * @retval None\r
+ */\r
+void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));\r
+ \r
+ USARTx->SR = (uint16_t)~USART_FLAG;\r
+}\r
+\r
+/**\r
+ * @brief Checks whether the specified USART interrupt has occurred or not.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_IT: specifies the USART interrupt source to check.\r
+ * This parameter can be one of the following values:\r
+ * @arg USART_IT_CTS: CTS change interrupt\r
+ * @arg USART_IT_LBD: LIN Break detection interrupt\r
+ * @arg USART_IT_TXE: Tansmit Data Register empty interrupt\r
+ * @arg USART_IT_TC: Transmission complete interrupt\r
+ * @arg USART_IT_RXNE: Receive Data register not empty interrupt\r
+ * @arg USART_IT_IDLE: Idle line detection interrupt\r
+ * @arg USART_IT_ORE: OverRun Error interrupt\r
+ * @arg USART_IT_NE: Noise Error interrupt\r
+ * @arg USART_IT_FE: Framing Error interrupt\r
+ * @arg USART_IT_PE: Parity Error interrupt\r
+ * @retval The new state of USART_IT (SET or RESET).\r
+ */\r
+ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT)\r
+{\r
+ uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;\r
+ ITStatus bitstatus = RESET;\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_GET_IT(USART_IT)); \r
+ \r
+ /* Get the USART register index */\r
+ usartreg = (((uint8_t)USART_IT) >> 0x05);\r
+ /* Get the interrupt position */\r
+ itmask = USART_IT & IT_MASK;\r
+ itmask = (uint32_t)0x01 << itmask;\r
+ \r
+ if (usartreg == 0x01) /* The IT is in CR1 register */\r
+ {\r
+ itmask &= USARTx->CR1;\r
+ }\r
+ else if (usartreg == 0x02) /* The IT is in CR2 register */\r
+ {\r
+ itmask &= USARTx->CR2;\r
+ }\r
+ else /* The IT is in CR3 register */\r
+ {\r
+ itmask &= USARTx->CR3;\r
+ }\r
+ \r
+ bitpos = USART_IT >> 0x08;\r
+ bitpos = (uint32_t)0x01 << bitpos;\r
+ bitpos &= USARTx->SR;\r
+ if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))\r
+ {\r
+ bitstatus = SET;\r
+ }\r
+ else\r
+ {\r
+ bitstatus = RESET;\r
+ }\r
+ \r
+ return bitstatus; \r
+}\r
+\r
+/**\r
+ * @brief Clears the USARTx\92s interrupt pending bits.\r
+ * @param USARTx: Select the USART peripheral. \r
+ * This parameter can be one of the following values:\r
+ * USART1, USART2 or USART3.\r
+ * @param USART_IT: specifies the interrupt pending bit to clear.\r
+ * This parameter can be one of the following values:\r
+ * @arg USART_IT_CTS: CTS change interrupt\r
+ * @arg USART_IT_LBD: LIN Break detection interrupt\r
+ * @arg USART_IT_TC: Transmission complete interrupt. \r
+ * @arg USART_IT_RXNE: Receive Data register not empty interrupt.\r
+ * \r
+ * @note\r
+ * - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun \r
+ * error) and IDLE (Idle line detected) pending bits are cleared by \r
+ * software sequence: a read operation to USART_SR register \r
+ * (USART_GetITStatus()) followed by a read operation to USART_DR register \r
+ * (USART_ReceiveData()).\r
+ * - RXNE pending bit can be also cleared by a read to the USART_DR register \r
+ * (USART_ReceiveData()).\r
+ * - TC pending bit can be also cleared by software sequence: a read \r
+ * operation to USART_SR register (USART_GetITStatus()) followed by a write \r
+ * operation to USART_DR register (USART_SendData()).\r
+ * - TXE pending bit is cleared only by a write to the USART_DR register \r
+ * (USART_SendData()).\r
+ * @retval None\r
+ */\r
+void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT)\r
+{\r
+ uint16_t bitpos = 0x00, itmask = 0x00;\r
+ /* Check the parameters */\r
+ assert_param(IS_USART_ALL_PERIPH(USARTx));\r
+ assert_param(IS_USART_CLEAR_IT(USART_IT)); \r
+ \r
+ bitpos = USART_IT >> 0x08;\r
+ itmask = ((uint16_t)0x01 << (uint16_t)bitpos);\r
+ USARTx->SR = (uint16_t)~itmask;\r
+}\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/\r
projects / freertos / commitdiff