2 FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
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4 This file is part of the FreeRTOS distribution.
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6 FreeRTOS is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License (version 2) as published by the
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8 Free Software Foundation and modified by the FreeRTOS exception.
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9 **NOTE** The exception to the GPL is included to allow you to distribute a
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10 combined work that includes FreeRTOS without being obliged to provide the
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11 source code for proprietary components outside of the FreeRTOS kernel.
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12 Alternative commercial license and support terms are also available upon
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13 request. See the licensing section of http://www.FreeRTOS.org for full
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16 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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21 You should have received a copy of the GNU General Public License along
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22 with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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23 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 ***************************************************************************
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28 * The FreeRTOS eBook and reference manual are available to purchase for a *
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29 * small fee. Help yourself get started quickly while also helping the *
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30 * FreeRTOS project! See http://www.FreeRTOS.org/Documentation for details *
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32 ***************************************************************************
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36 Please ensure to read the configuration and relevant port sections of the
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37 online documentation.
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39 http://www.FreeRTOS.org - Documentation, latest information, license and
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42 http://www.SafeRTOS.com - A version that is certified for use in safety
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45 http://www.OpenRTOS.com - Commercial support, development, porting,
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46 licensing and training services.
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50 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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54 /*-----------------------------------------------------------
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55 * Components that can be compiled to either ARM or THUMB mode are
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56 * contained in this file.c The ISR routines, which can only be compiled
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57 * to ARM mode, are contained in serialISR.c.
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58 *----------------------------------------------------------*/
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62 /* Library includes. */
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63 #include "75x_uart.h"
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64 #include "75x_gpio.h"
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65 #include "75x_eic.h"
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66 #include "75x_mrcc.h"
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68 /* Scheduler includes. */
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69 #include "FreeRTOS.h"
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72 /* Demo application includes. */
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75 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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76 #define serNO_BLOCK ( ( portTickType ) 0 )
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78 /*-----------------------------------------------------------*/
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80 /* Queues used to hold received characters, and characters waiting to be
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82 static xQueueHandle xRxedChars;
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83 static xQueueHandle xCharsForTx;
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85 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
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87 /*-----------------------------------------------------------*/
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89 /* The interrupt service routine - called from the assembly entry point. */
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90 void vSerialISR( void );
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91 void vConfigureQueues( xQueueHandle xQForRx, xQueueHandle xQForTx, volatile portBASE_TYPE *pxEmptyFlag );
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93 /*-----------------------------------------------------------*/
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96 * See the serial2.h header file.
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98 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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100 xComPortHandle xReturn;
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101 UART_InitTypeDef UART_InitStructure;
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102 GPIO_InitTypeDef GPIO_InitStructure;
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103 EIC_IRQInitTypeDef EIC_IRQInitStructure;
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105 /* Create the queues used to hold Rx and Tx characters. */
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106 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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107 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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109 /* If the queues were created correctly then setup the serial port
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111 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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114 vConfigureQueues( xRxedChars, xCharsForTx, &xQueueEmpty );
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116 portENTER_CRITICAL();
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118 /* Enable the UART0 Clock. */
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119 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
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121 /* Configure the UART0_Tx as alternate function */
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122 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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123 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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124 GPIO_Init(GPIO0, &GPIO_InitStructure);
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126 /* Configure the UART0_Rx as input floating */
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127 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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128 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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129 GPIO_Init(GPIO0, &GPIO_InitStructure);
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131 /* Configure UART0. */
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132 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
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133 UART_InitStructure.UART_StopBits = UART_StopBits_1;
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134 UART_InitStructure.UART_Parity = UART_Parity_No;
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135 UART_InitStructure.UART_BaudRate = ulWantedBaud;
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136 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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137 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
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138 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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139 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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140 UART_Init(UART0, &UART_InitStructure);
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142 /* Enable the UART0 */
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143 UART_Cmd(UART0, ENABLE);
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145 /* Configure the IEC for the UART interrupts. */
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146 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
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147 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
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148 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
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149 EIC_IRQInit(&EIC_IRQInitStructure);
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151 xQueueEmpty = pdTRUE;
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152 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
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154 portEXIT_CRITICAL();
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158 xReturn = ( xComPortHandle ) 0;
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161 /* This demo file only supports a single port but we have to return
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162 something to comply with the standard demo header file. */
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165 /*-----------------------------------------------------------*/
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167 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
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169 /* The port handle is not required as this driver only supports one port. */
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172 /* Get the next character from the buffer. Return false if no characters
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173 are available, or arrive before xBlockTime expires. */
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174 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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183 /*-----------------------------------------------------------*/
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185 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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187 signed char *pxNext;
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189 /* A couple of parameters that this port does not use. */
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190 ( void ) usStringLength;
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193 /* NOTE: This implementation does not handle the queue being full as no
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194 block time is used! */
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196 /* The port handle is not required as this driver only supports UART0. */
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199 /* Send each character in the string, one at a time. */
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200 pxNext = ( signed char * ) pcString;
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203 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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207 /*-----------------------------------------------------------*/
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209 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
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211 portBASE_TYPE xReturn;
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213 /* Place the character in the queue of characters to be transmitted. */
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214 portENTER_CRITICAL();
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216 if( xQueueEmpty == pdTRUE )
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218 UART0->DR = cOutChar;
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223 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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233 xQueueEmpty = pdFALSE;
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235 portEXIT_CRITICAL();
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239 /*-----------------------------------------------------------*/
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241 void vSerialClose( xComPortHandle xPort )
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243 /* Not supported as not required by the demo application. */
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245 /*-----------------------------------------------------------*/
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