2 * FreeRTOS Kernel V10.3.0
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3 * Copyright (C) 2020 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.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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29 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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32 /* Library includes. */
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33 #include "75x_uart.h"
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34 #include "75x_gpio.h"
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35 #include "75x_eic.h"
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36 #include "75x_mrcc.h"
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38 /* Scheduler includes. */
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39 #include "FreeRTOS.h"
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42 /* Demo application includes. */
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45 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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46 #define serNO_BLOCK ( ( TickType_t ) 0 )
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48 /*-----------------------------------------------------------*/
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50 /* Queues used to hold received characters, and characters waiting to be
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52 static QueueHandle_t xRxedChars;
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53 static QueueHandle_t xCharsForTx;
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55 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
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57 /*-----------------------------------------------------------*/
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59 /* The interrupt service routine - called from the assembly entry point. */
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60 __arm void vSerialISR( void );
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62 /*-----------------------------------------------------------*/
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65 * See the serial2.h header file.
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67 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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69 xComPortHandle xReturn;
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70 UART_InitTypeDef UART_InitStructure;
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71 GPIO_InitTypeDef GPIO_InitStructure;
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72 EIC_IRQInitTypeDef EIC_IRQInitStructure;
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74 /* Create the queues used to hold Rx and Tx characters. */
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75 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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76 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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78 /* If the queues were created correctly then setup the serial port
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80 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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82 portENTER_CRITICAL();
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84 /* Enable the UART0 Clock. */
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85 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
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87 /* Configure the UART0_Tx as alternate function */
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88 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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89 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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90 GPIO_Init(GPIO0, &GPIO_InitStructure);
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92 /* Configure the UART0_Rx as input floating */
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93 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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94 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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95 GPIO_Init(GPIO0, &GPIO_InitStructure);
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97 /* Configure UART0. */
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98 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
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99 UART_InitStructure.UART_StopBits = UART_StopBits_1;
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100 UART_InitStructure.UART_Parity = UART_Parity_No;
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101 UART_InitStructure.UART_BaudRate = ulWantedBaud;
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102 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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103 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
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104 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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105 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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106 UART_Init(UART0, &UART_InitStructure);
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108 /* Enable the UART0 */
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109 UART_Cmd(UART0, ENABLE);
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111 /* Configure the IEC for the UART interrupts. */
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112 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
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113 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
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114 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
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115 EIC_IRQInit(&EIC_IRQInitStructure);
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117 xQueueEmpty = pdTRUE;
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118 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
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120 portEXIT_CRITICAL();
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124 xReturn = ( xComPortHandle ) 0;
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127 /* This demo file only supports a single port but we have to return
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128 something to comply with the standard demo header file. */
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131 /*-----------------------------------------------------------*/
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133 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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135 /* The port handle is not required as this driver only supports one port. */
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138 /* Get the next character from the buffer. Return false if no characters
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139 are available, or arrive before xBlockTime expires. */
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140 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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149 /*-----------------------------------------------------------*/
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151 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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153 signed char *pxNext;
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155 /* A couple of parameters that this port does not use. */
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156 ( void ) usStringLength;
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159 /* NOTE: This implementation does not handle the queue being full as no
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160 block time is used! */
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162 /* The port handle is not required as this driver only supports UART0. */
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165 /* Send each character in the string, one at a time. */
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166 pxNext = ( signed char * ) pcString;
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169 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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173 /*-----------------------------------------------------------*/
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175 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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177 portBASE_TYPE xReturn;
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179 /* Place the character in the queue of characters to be transmitted. */
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180 portENTER_CRITICAL();
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182 if( xQueueEmpty == pdTRUE )
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184 UART0->DR = cOutChar;
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189 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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199 xQueueEmpty = pdFALSE;
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201 portEXIT_CRITICAL();
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205 /*-----------------------------------------------------------*/
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207 void vSerialClose( xComPortHandle xPort )
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209 /* Not supported as not required by the demo application. */
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211 /*-----------------------------------------------------------*/
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213 __arm void vSerialISR( void )
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216 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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220 if( UART0->MIS & UART_IT_Transmit )
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222 /* The interrupt was caused by the THR becoming empty. Are there any
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223 more characters to transmit? */
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224 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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226 /* A character was retrieved from the queue so can be sent to the
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232 xQueueEmpty = pdTRUE;
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235 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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238 if( UART0->MIS & UART_IT_Receive )
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240 /* The interrupt was caused by a character being received. Grab the
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241 character from the RHR and place it in the queue of received
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244 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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245 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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247 } while( UART0->MIS );
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249 /* If a task was woken by either a character being received or a character
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250 being transmitted then we may need to switch to another task. */
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251 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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