2 * FreeRTOS Kernel V10.0.0
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3 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software. If you wish to use our Amazon
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14 * FreeRTOS name, please do so in a fair use way that does not cause confusion.
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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18 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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19 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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20 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 * http://www.FreeRTOS.org
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24 * http://aws.amazon.com/freertos
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26 * 1 tab == 4 spaces!
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30 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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34 /*-----------------------------------------------------------
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35 * Components that can be compiled to either ARM or THUMB mode are
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36 * contained in this file.c The ISR routines, which can only be compiled
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37 * to ARM mode, are contained in serialISR.c.
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38 *----------------------------------------------------------*/
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42 /* Library includes. */
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43 #include "75x_uart.h"
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44 #include "75x_gpio.h"
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45 #include "75x_eic.h"
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46 #include "75x_mrcc.h"
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48 /* Scheduler includes. */
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49 #include "FreeRTOS.h"
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52 /* Demo application includes. */
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55 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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56 #define serNO_BLOCK ( ( TickType_t ) 0 )
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58 /*-----------------------------------------------------------*/
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60 /* Queues used to hold received characters, and characters waiting to be
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62 static QueueHandle_t xRxedChars;
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63 static QueueHandle_t xCharsForTx;
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65 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
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67 /*-----------------------------------------------------------*/
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69 /* The interrupt service routine - called from the assembly entry point. */
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70 void vSerialISR( void );
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71 void vConfigureQueues( QueueHandle_t xQForRx, QueueHandle_t xQForTx, volatile portBASE_TYPE *pxEmptyFlag );
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73 /*-----------------------------------------------------------*/
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76 * See the serial2.h header file.
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78 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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80 xComPortHandle xReturn;
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81 UART_InitTypeDef UART_InitStructure;
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82 GPIO_InitTypeDef GPIO_InitStructure;
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83 EIC_IRQInitTypeDef EIC_IRQInitStructure;
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85 /* Create the queues used to hold Rx and Tx characters. */
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86 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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87 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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89 /* If the queues were created correctly then setup the serial port
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91 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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94 vConfigureQueues( xRxedChars, xCharsForTx, &xQueueEmpty );
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96 portENTER_CRITICAL();
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98 /* Enable the UART0 Clock. */
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99 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
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101 /* Configure the UART0_Tx as alternate function */
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102 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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103 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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104 GPIO_Init(GPIO0, &GPIO_InitStructure);
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106 /* Configure the UART0_Rx as input floating */
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107 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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108 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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109 GPIO_Init(GPIO0, &GPIO_InitStructure);
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111 /* Configure UART0. */
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112 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
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113 UART_InitStructure.UART_StopBits = UART_StopBits_1;
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114 UART_InitStructure.UART_Parity = UART_Parity_No;
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115 UART_InitStructure.UART_BaudRate = ulWantedBaud;
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116 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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117 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
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118 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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119 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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120 UART_Init(UART0, &UART_InitStructure);
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122 /* Enable the UART0 */
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123 UART_Cmd(UART0, ENABLE);
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125 /* Configure the IEC for the UART interrupts. */
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126 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
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127 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
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128 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
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129 EIC_IRQInit(&EIC_IRQInitStructure);
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131 xQueueEmpty = pdTRUE;
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132 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
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134 portEXIT_CRITICAL();
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138 xReturn = ( xComPortHandle ) 0;
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141 /* This demo file only supports a single port but we have to return
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142 something to comply with the standard demo header file. */
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145 /*-----------------------------------------------------------*/
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147 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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149 /* The port handle is not required as this driver only supports one port. */
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152 /* Get the next character from the buffer. Return false if no characters
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153 are available, or arrive before xBlockTime expires. */
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154 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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163 /*-----------------------------------------------------------*/
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165 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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167 signed char *pxNext;
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169 /* A couple of parameters that this port does not use. */
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170 ( void ) usStringLength;
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173 /* NOTE: This implementation does not handle the queue being full as no
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174 block time is used! */
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176 /* The port handle is not required as this driver only supports UART0. */
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179 /* Send each character in the string, one at a time. */
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180 pxNext = ( signed char * ) pcString;
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183 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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187 /*-----------------------------------------------------------*/
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189 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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191 portBASE_TYPE xReturn;
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193 /* Place the character in the queue of characters to be transmitted. */
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194 portENTER_CRITICAL();
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196 if( xQueueEmpty == pdTRUE )
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198 UART0->DR = cOutChar;
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203 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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213 xQueueEmpty = pdFALSE;
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215 portEXIT_CRITICAL();
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219 /*-----------------------------------------------------------*/
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221 void vSerialClose( xComPortHandle xPort )
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223 /* Not supported as not required by the demo application. */
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225 /*-----------------------------------------------------------*/
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