2 FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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34 distribute a combined work that includes FreeRTOS without being obliged to
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35 provide the source code for proprietary components outside of the FreeRTOS
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38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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41 details. You should have received a copy of the GNU General Public License
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42 and the FreeRTOS license exception along with FreeRTOS; if not it can be
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43 viewed here: http://www.freertos.org/a00114.html and also obtained by
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44 writing to Real Time Engineers Ltd., contact details for whom are available
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45 on the FreeRTOS WEB site.
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49 ***************************************************************************
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51 * Having a problem? Start by reading the FAQ "My application does *
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52 * not run, what could be wrong?" *
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54 * http://www.FreeRTOS.org/FAQHelp.html *
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56 ***************************************************************************
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59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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60 license and Real Time Engineers Ltd. contact details.
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62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
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64 fully thread aware and reentrant UDP/IP stack.
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66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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67 Integrity Systems, who sell the code with commercial support,
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68 indemnification and middleware, under the OpenRTOS brand.
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70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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71 engineered and independently SIL3 certified version for use in safety and
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72 mission critical applications that require provable dependability.
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76 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
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78 NOTE: This driver is primarily to test the scheduler functionality. It does
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79 not effectively use the buffers or DMA and is therefore not intended to be
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80 an example of an efficient driver. */
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82 /* Standard include file. */
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85 /* Scheduler include files. */
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86 #include "FreeRTOS.h"
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90 /* Demo app include files. */
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93 /* Hardware definitions. */
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94 #define serNO_PARITY ( ( unsigned portCHAR ) 0x02 << 3 )
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95 #define ser8DATA_BITS ( ( unsigned portCHAR ) 0x03 )
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96 #define ser1STOP_BIT ( ( unsigned portCHAR ) 0x07 )
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97 #define serSYSTEM_CLOCK ( ( unsigned portCHAR ) 0xdd )
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98 #define serTX_ENABLE ( ( unsigned portCHAR ) 0x04 )
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99 #define serRX_ENABLE ( ( unsigned portCHAR ) 0x01 )
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100 #define serTX_INT ( ( unsigned portCHAR ) 0x01 )
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101 #define serRX_INT ( ( unsigned portCHAR ) 0x02 )
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104 /* The queues used to communicate between tasks and ISR's. */
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105 static xQueueHandle xRxedChars;
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106 static xQueueHandle xCharsForTx;
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108 /* Flag used to indicate the tx status. */
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109 static portBASE_TYPE xTxHasEnded = pdTRUE;
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111 /*-----------------------------------------------------------*/
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113 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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115 const unsigned portLONG ulBaudRateDivisor = ( configCPU_CLOCK_HZ / ( 32UL * ulWantedBaud ) );
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117 /* Create the queues used by the com test task. */
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118 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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119 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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121 xTxHasEnded = pdTRUE;
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123 /* Set the pins to UART mode. */
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124 MCF_GPIO_PUAPAR |= MCF_GPIO_PUAPAR_UTXD0_UTXD0;
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125 MCF_GPIO_PUAPAR |= MCF_GPIO_PUAPAR_URXD0_URXD0;
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127 /* Reset the peripheral. */
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128 MCF_UART0_UCR = MCF_UART_UCR_RESET_RX;
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129 MCF_UART0_UCR = MCF_UART_UCR_RESET_TX;
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130 MCF_UART0_UCR = MCF_UART_UCR_RESET_ERROR;
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131 MCF_UART0_UCR = MCF_UART_UCR_RESET_BKCHGINT;
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132 MCF_UART0_UCR = MCF_UART_UCR_RESET_MR | MCF_UART_UCR_RX_DISABLED | MCF_UART_UCR_TX_DISABLED;
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134 /* Configure the UART. */
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135 MCF_UART0_UMR1 = serNO_PARITY | ser8DATA_BITS;
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136 MCF_UART0_UMR2 = ser1STOP_BIT;
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137 MCF_UART0_UCSR = serSYSTEM_CLOCK;
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139 MCF_UART0_UBG1 = ( unsigned portCHAR ) ( ( ulBaudRateDivisor >> 8UL ) & 0xffUL );
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140 MCF_UART0_UBG2 = ( unsigned portCHAR ) ( ulBaudRateDivisor & 0xffUL );
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143 MCF_UART0_UCR = serTX_ENABLE | serRX_ENABLE;
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145 /* Configure the interrupt controller. Run the UARTs above the kernel
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146 interrupt priority for demo purposes. */
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147 MCF_INTC0_ICR13 = ( ( configMAX_SYSCALL_INTERRUPT_PRIORITY - 1 ) << 3 );
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148 MCF_INTC0_IMRL &= ~( MCF_INTC_IMRL_INT_MASK13 | 0x01 );
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150 /* The Tx interrupt is not enabled until there is data to send. */
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151 MCF_UART0_UIMR = serRX_INT;
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153 /* Only a single port is implemented so we don't need to return anything. */
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156 /*-----------------------------------------------------------*/
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158 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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160 /* Only one port is supported. */
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163 /* Get the next character from the buffer. Return false if no characters
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164 are available or arrive before xBlockTime expires. */
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165 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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174 /*-----------------------------------------------------------*/
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176 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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178 /* Only one port is supported. */
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181 /* Return false if after the block time there is no room on the Tx queue. */
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182 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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187 /* A critical section should not be required as xTxHasEnded will not be
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188 written to by the ISR if it is already 0 (is this correct?). */
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189 if( xTxHasEnded != pdFALSE )
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191 xTxHasEnded = pdFALSE;
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192 MCF_UART0_UIMR = serRX_INT | serTX_INT;
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197 /*-----------------------------------------------------------*/
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199 void vSerialClose( xComPortHandle xPort )
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203 /*-----------------------------------------------------------*/
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205 __declspec(interrupt:0) void vUART0InterruptHandler( void )
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207 unsigned portCHAR ucChar;
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208 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE, xDoneSomething = pdTRUE;
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210 while( xDoneSomething != pdFALSE )
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212 xDoneSomething = pdFALSE;
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214 /* Does the tx buffer contain space? */
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215 if( ( MCF_UART0_USR & MCF_UART_USR_TXRDY ) != 0x00 )
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217 /* Are there any characters queued to be sent? */
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218 if( xQueueReceiveFromISR( xCharsForTx, &ucChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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220 /* Send the next char. */
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221 MCF_UART0_UTB = ucChar;
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222 xDoneSomething = pdTRUE;
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226 /* Turn off the Tx interrupt until such time as another character
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227 is being transmitted. */
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228 MCF_UART0_UIMR = serRX_INT;
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229 xTxHasEnded = pdTRUE;
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233 if( MCF_UART0_USR & MCF_UART_USR_RXRDY )
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235 ucChar = MCF_UART0_URB;
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236 xQueueSendFromISR( xRxedChars, &ucChar, &xHigherPriorityTaskWoken );
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237 xDoneSomething = pdTRUE;
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241 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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