2 FreeRTOS V7.5.3 - Copyright (C) 2013 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to distribute
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28 >>! a combined work that includes FreeRTOS without being obliged to provide
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29 >>! the source code for proprietary components outside of the FreeRTOS
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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67 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
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69 NOTE: This driver is primarily to test the scheduler functionality. It does
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70 not effectively use the buffers or DMA and is therefore not intended to be
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71 an example of an efficient driver. */
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73 /* Standard include file. */
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76 /* Scheduler include files. */
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77 #include "FreeRTOS.h"
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81 /* Demo app include files. */
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84 /* Hardware definitions. */
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85 #define serNO_PARITY ( ( unsigned portCHAR ) 0x02 << 3 )
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86 #define ser8DATA_BITS ( ( unsigned portCHAR ) 0x03 )
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87 #define ser1STOP_BIT ( ( unsigned portCHAR ) 0x07 )
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88 #define serSYSTEM_CLOCK ( ( unsigned portCHAR ) 0xdd )
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89 #define serTX_ENABLE ( ( unsigned portCHAR ) 0x04 )
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90 #define serRX_ENABLE ( ( unsigned portCHAR ) 0x01 )
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91 #define serTX_INT ( ( unsigned portCHAR ) 0x01 )
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92 #define serRX_INT ( ( unsigned portCHAR ) 0x02 )
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95 /* The queues used to communicate between tasks and ISR's. */
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96 static xQueueHandle xRxedChars;
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97 static xQueueHandle xCharsForTx;
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99 /* Flag used to indicate the tx status. */
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100 static portBASE_TYPE xTxHasEnded = pdTRUE;
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102 /*-----------------------------------------------------------*/
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104 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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106 const unsigned portLONG ulBaudRateDivisor = ( configCPU_CLOCK_HZ / ( 32UL * ulWantedBaud ) );
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108 /* Create the queues used by the com test task. */
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109 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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110 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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112 xTxHasEnded = pdTRUE;
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114 /* Set the pins to UART mode. */
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115 MCF_GPIO_PUAPAR |= MCF_GPIO_PUAPAR_UTXD0_UTXD0;
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116 MCF_GPIO_PUAPAR |= MCF_GPIO_PUAPAR_URXD0_URXD0;
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118 /* Reset the peripheral. */
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119 MCF_UART0_UCR = MCF_UART_UCR_RESET_RX;
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120 MCF_UART0_UCR = MCF_UART_UCR_RESET_TX;
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121 MCF_UART0_UCR = MCF_UART_UCR_RESET_ERROR;
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122 MCF_UART0_UCR = MCF_UART_UCR_RESET_BKCHGINT;
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123 MCF_UART0_UCR = MCF_UART_UCR_RESET_MR | MCF_UART_UCR_RX_DISABLED | MCF_UART_UCR_TX_DISABLED;
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125 /* Configure the UART. */
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126 MCF_UART0_UMR1 = serNO_PARITY | ser8DATA_BITS;
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127 MCF_UART0_UMR2 = ser1STOP_BIT;
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128 MCF_UART0_UCSR = serSYSTEM_CLOCK;
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130 MCF_UART0_UBG1 = ( unsigned portCHAR ) ( ( ulBaudRateDivisor >> 8UL ) & 0xffUL );
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131 MCF_UART0_UBG2 = ( unsigned portCHAR ) ( ulBaudRateDivisor & 0xffUL );
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134 MCF_UART0_UCR = serTX_ENABLE | serRX_ENABLE;
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136 /* Configure the interrupt controller. Run the UARTs above the kernel
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137 interrupt priority for demo purposes. */
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138 MCF_INTC0_ICR13 = ( ( configMAX_SYSCALL_INTERRUPT_PRIORITY - 1 ) << 3 );
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139 MCF_INTC0_IMRL &= ~( MCF_INTC_IMRL_INT_MASK13 | 0x01 );
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141 /* The Tx interrupt is not enabled until there is data to send. */
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142 MCF_UART0_UIMR = serRX_INT;
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144 /* Only a single port is implemented so we don't need to return anything. */
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147 /*-----------------------------------------------------------*/
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149 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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151 /* Only one port is supported. */
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154 /* Get the next character from the buffer. Return false if no characters
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155 are available or arrive before xBlockTime expires. */
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156 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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165 /*-----------------------------------------------------------*/
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167 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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169 /* Only one port is supported. */
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172 /* Return false if after the block time there is no room on the Tx queue. */
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173 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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178 /* A critical section should not be required as xTxHasEnded will not be
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179 written to by the ISR if it is already 0 (is this correct?). */
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180 if( xTxHasEnded != pdFALSE )
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182 xTxHasEnded = pdFALSE;
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183 MCF_UART0_UIMR = serRX_INT | serTX_INT;
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188 /*-----------------------------------------------------------*/
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190 void vSerialClose( xComPortHandle xPort )
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194 /*-----------------------------------------------------------*/
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196 __declspec(interrupt:0) void vUART0InterruptHandler( void )
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198 unsigned portCHAR ucChar;
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199 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE, xDoneSomething = pdTRUE;
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201 while( xDoneSomething != pdFALSE )
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203 xDoneSomething = pdFALSE;
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205 /* Does the tx buffer contain space? */
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206 if( ( MCF_UART0_USR & MCF_UART_USR_TXRDY ) != 0x00 )
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208 /* Are there any characters queued to be sent? */
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209 if( xQueueReceiveFromISR( xCharsForTx, &ucChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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211 /* Send the next char. */
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212 MCF_UART0_UTB = ucChar;
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213 xDoneSomething = pdTRUE;
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217 /* Turn off the Tx interrupt until such time as another character
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218 is being transmitted. */
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219 MCF_UART0_UIMR = serRX_INT;
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220 xTxHasEnded = pdTRUE;
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224 if( MCF_UART0_USR & MCF_UART_USR_RXRDY )
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226 ucChar = MCF_UART0_URB;
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227 xQueueSendFromISR( xRxedChars, &ucChar, &xHigherPriorityTaskWoken );
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228 xDoneSomething = pdTRUE;
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232 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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