2 FreeRTOS.org V4.2.1 - Copyright (C) 2003-2007 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 See http://www.FreeRTOS.org for documentation, latest information, license
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28 and contact details. Please ensure to read the configuration and relevant
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29 port sections of the online documentation.
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31 Also see http://www.SafeRTOS.com for an IEC 61508 compliant version along
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32 with commercial development and support options.
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33 ***************************************************************************
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37 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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40 /* Library includes. */
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41 #include "75x_uart.h"
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42 #include "75x_gpio.h"
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43 #include "75x_eic.h"
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44 #include "75x_mrcc.h"
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46 /* Scheduler includes. */
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47 #include "FreeRTOS.h"
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50 /* Demo application includes. */
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53 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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54 #define serNO_BLOCK ( ( portTickType ) 0 )
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56 /*-----------------------------------------------------------*/
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58 /* Queues used to hold received characters, and characters waiting to be
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60 static xQueueHandle xRxedChars;
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61 static xQueueHandle xCharsForTx;
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63 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
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65 /*-----------------------------------------------------------*/
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67 /* The interrupt service routine - called from the assembly entry point. */
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68 __arm void vSerialISR( void );
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70 /*-----------------------------------------------------------*/
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73 * See the serial2.h header file.
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75 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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77 xComPortHandle xReturn;
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78 UART_InitTypeDef UART_InitStructure;
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79 GPIO_InitTypeDef GPIO_InitStructure;
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80 EIC_IRQInitTypeDef EIC_IRQInitStructure;
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82 /* Create the queues used to hold Rx and Tx characters. */
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83 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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84 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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86 /* If the queues were created correctly then setup the serial port
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88 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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90 portENTER_CRITICAL();
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92 /* Enable the UART0 Clock. */
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93 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
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95 /* Configure the UART0_Tx as alternate function */
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96 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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97 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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98 GPIO_Init(GPIO0, &GPIO_InitStructure);
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100 /* Configure the UART0_Rx as input floating */
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101 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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102 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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103 GPIO_Init(GPIO0, &GPIO_InitStructure);
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105 /* Configure UART0. */
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106 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
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107 UART_InitStructure.UART_StopBits = UART_StopBits_1;
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108 UART_InitStructure.UART_Parity = UART_Parity_No;
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109 UART_InitStructure.UART_BaudRate = ulWantedBaud;
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110 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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111 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
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112 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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113 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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114 UART_Init(UART0, &UART_InitStructure);
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116 /* Enable the UART0 */
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117 UART_Cmd(UART0, ENABLE);
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119 /* Configure the IEC for the UART interrupts. */
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120 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
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121 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
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122 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
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123 EIC_IRQInit(&EIC_IRQInitStructure);
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125 xQueueEmpty = pdTRUE;
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126 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
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128 portEXIT_CRITICAL();
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132 xReturn = ( xComPortHandle ) 0;
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135 /* This demo file only supports a single port but we have to return
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136 something to comply with the standard demo header file. */
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139 /*-----------------------------------------------------------*/
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141 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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143 /* The port handle is not required as this driver only supports one port. */
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146 /* Get the next character from the buffer. Return false if no characters
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147 are available, or arrive before xBlockTime expires. */
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148 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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157 /*-----------------------------------------------------------*/
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159 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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161 signed portCHAR *pxNext;
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163 /* A couple of parameters that this port does not use. */
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164 ( void ) usStringLength;
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167 /* NOTE: This implementation does not handle the queue being full as no
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168 block time is used! */
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170 /* The port handle is not required as this driver only supports UART0. */
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173 /* Send each character in the string, one at a time. */
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174 pxNext = ( signed portCHAR * ) pcString;
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177 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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181 /*-----------------------------------------------------------*/
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183 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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185 portBASE_TYPE xReturn;
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187 /* Place the character in the queue of characters to be transmitted. */
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188 portENTER_CRITICAL();
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190 if( xQueueEmpty == pdTRUE )
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192 UART0->DR = cOutChar;
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197 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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207 xQueueEmpty = pdFALSE;
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209 portEXIT_CRITICAL();
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213 /*-----------------------------------------------------------*/
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215 void vSerialClose( xComPortHandle xPort )
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217 /* Not supported as not required by the demo application. */
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219 /*-----------------------------------------------------------*/
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221 __arm void vSerialISR( void )
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223 signed portCHAR cChar;
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224 portBASE_TYPE xTaskWokenByTx = pdFALSE, xTaskWokenByPost = pdFALSE;
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228 if( UART0->MIS & UART_IT_Transmit )
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230 /* The interrupt was caused by the THR becoming empty. Are there any
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231 more characters to transmit? */
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232 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWokenByTx ) == pdTRUE )
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234 /* A character was retrieved from the queue so can be sent to the
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240 xQueueEmpty = pdTRUE;
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243 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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246 if( UART0->MIS & UART_IT_Receive )
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248 /* The interrupt was caused by a character being received. Grab the
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249 character from the RHR and place it in the queue of received
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252 xTaskWokenByPost = xQueueSendFromISR( xRxedChars, &cChar, xTaskWokenByPost );
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253 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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255 } while( UART0->MIS );
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257 /* If a task was woken by either a character being received or a character
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258 being transmitted then we may need to switch to another task. */
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259 portEND_SWITCHING_ISR( ( xTaskWokenByPost || xTaskWokenByTx ) );
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