2 FreeRTOS V8.2.0rc1 - Copyright (C) 2014 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 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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13 >>! NOTE: The modification to the GPL is included to allow you to !<<
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14 >>! distribute a combined work that includes FreeRTOS without being !<<
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15 >>! obliged to provide the source code for proprietary components !<<
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16 >>! outside of the FreeRTOS kernel. !<<
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18 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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19 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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20 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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21 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * Having a problem? Start by reading the FAQ "My application does *
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28 * not run, what could be wrong?". Have you defined configASSERT()? *
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30 * http://www.FreeRTOS.org/FAQHelp.html *
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32 ***************************************************************************
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34 ***************************************************************************
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36 * FreeRTOS provides completely free yet professionally developed, *
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37 * robust, strictly quality controlled, supported, and cross *
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38 * platform software that is more than just the market leader, it *
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39 * is the industry's de facto standard. *
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41 * Help yourself get started quickly while simultaneously helping *
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42 * to support the FreeRTOS project by purchasing a FreeRTOS *
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43 * tutorial book, reference manual, or both: *
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44 * http://www.FreeRTOS.org/Documentation *
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46 ***************************************************************************
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48 ***************************************************************************
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50 * Investing in training allows your team to be as productive as *
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51 * possible as early as possible, lowering your overall development *
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52 * cost, and enabling you to bring a more robust product to market *
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53 * earlier than would otherwise be possible. Richard Barry is both *
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54 * the architect and key author of FreeRTOS, and so also the world's *
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55 * leading authority on what is the world's most popular real time *
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56 * kernel for deeply embedded MCU designs. Obtaining your training *
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57 * from Richard ensures your team will gain directly from his in-depth *
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58 * product knowledge and years of usage experience. Contact Real Time *
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59 * Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
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60 * by Richard Barry: http://www.FreeRTOS.org/contact
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62 ***************************************************************************
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64 ***************************************************************************
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66 * You are receiving this top quality software for free. Please play *
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67 * fair and reciprocate by reporting any suspected issues and *
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68 * participating in the community forum: *
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69 * http://www.FreeRTOS.org/support *
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73 ***************************************************************************
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75 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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76 license and Real Time Engineers Ltd. contact details.
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78 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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79 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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80 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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82 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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83 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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85 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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86 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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87 licenses offer ticketed support, indemnification and commercial middleware.
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89 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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90 engineered and independently SIL3 certified version for use in safety and
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91 mission critical applications that require provable dependability.
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97 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR USART0.
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99 This file contains all the serial port components that can be compiled to
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100 either ARM or THUMB mode. Components that must be compiled to ARM mode are
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101 contained in serialISR.c.
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104 /* Standard includes. */
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105 #include <stdlib.h>
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107 /* Scheduler includes. */
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108 #include "FreeRTOS.h"
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112 /* Demo application includes. */
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113 #include "serial.h"
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114 #include "AT91R40008.h"
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119 /*-----------------------------------------------------------*/
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121 /* Constants to setup and access the UART. */
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122 #define portUSART0_AIC_CHANNEL ( ( unsigned long ) 2 )
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124 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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125 #define serHANDLE ( ( xComPortHandle ) 1 )
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126 #define serNO_BLOCK ( ( TickType_t ) 0 )
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128 /*-----------------------------------------------------------*/
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130 /* Queues used to hold received characters, and characters waiting to be
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132 static QueueHandle_t xRxedChars;
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133 static QueueHandle_t xCharsForTx;
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135 /*-----------------------------------------------------------*/
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138 * The queues are created in serialISR.c as they are used from the ISR.
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139 * Obtain references to the queues and THRE Empty flag.
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141 extern void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, QueueHandle_t *pxRxedChars, QueueHandle_t *pxCharsForTx );
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143 /*-----------------------------------------------------------*/
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145 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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147 unsigned long ulSpeed;
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148 unsigned long ulCD;
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149 xComPortHandle xReturn = serHANDLE;
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150 extern void ( vUART_ISR_Wrapper )( void );
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152 /* The queues are used in the serial ISR routine, so are created from
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153 serialISR.c (which is always compiled to ARM mode. */
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154 vSerialISRCreateQueues( uxQueueLength, &xRxedChars, &xCharsForTx );
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157 ( xRxedChars != serINVALID_QUEUE ) &&
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158 ( xCharsForTx != serINVALID_QUEUE ) &&
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159 ( ulWantedBaud != ( unsigned long ) 0 )
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162 portENTER_CRITICAL();
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164 /* Enable clock to USART0... */
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165 AT91C_BASE_PS->PS_PCER = AT91C_PS_US0;
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167 /* Disable all USART0 interrupt sources to begin... */
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168 AT91C_BASE_US0->US_IDR = 0xFFFFFFFF;
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170 /* Reset various status bits (just in case)... */
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171 AT91C_BASE_US0->US_CR = US_RSTSTA;
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173 AT91C_BASE_PIO->PIO_PDR = TXD0 | RXD0; /* Enable RXD and TXD pins */
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174 AT91C_BASE_US0->US_CR = US_RSTRX | US_RSTTX | US_RXDIS | US_TXDIS;
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176 /* Clear Transmit and Receive Counters */
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177 AT91C_BASE_US0->US_RCR = 0;
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178 AT91C_BASE_US0->US_TCR = 0;
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180 /* Input clock to baud rate generator is MCK */
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181 ulSpeed = configCPU_CLOCK_HZ * 10;
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182 ulSpeed = ulSpeed / 16;
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183 ulSpeed = ulSpeed / ulWantedBaud;
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185 /* compute the error */
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186 ulCD = ulSpeed / 10;
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187 if ((ulSpeed - (ulCD * 10)) >= 5)
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190 /* Define the baud rate divisor register */
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191 AT91C_BASE_US0->US_BRGR = ulCD;
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193 /* Define the USART mode */
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194 AT91C_BASE_US0->US_MR = US_CLKS_MCK | US_CHRL_8 | US_PAR_NO | US_NBSTOP_1 | US_CHMODE_NORMAL;
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196 /* Write the Timeguard Register */
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197 AT91C_BASE_US0->US_TTGR = 0;
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199 /* Setup the interrupt for USART0.
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201 Store interrupt handler function address in USART0 vector register... */
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202 AT91C_BASE_AIC->AIC_SVR[ portUSART0_AIC_CHANNEL ] = (unsigned long)vUART_ISR_Wrapper;
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204 /* USART0 interrupt level-sensitive, priority 1... */
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205 AT91C_BASE_AIC->AIC_SMR[ portUSART0_AIC_CHANNEL ] = AIC_SRCTYPE_INT_LEVEL_SENSITIVE | 1;
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207 /* Clear some pending USART0 interrupts (just in case)... */
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208 AT91C_BASE_US0->US_CR = US_RSTSTA;
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210 /* Enable USART0 interrupt sources (but not Tx for now)... */
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211 AT91C_BASE_US0->US_IER = US_RXRDY;
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213 /* Enable USART0 interrupts in the AIC... */
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214 AT91C_BASE_AIC->AIC_IECR = ( 1 << portUSART0_AIC_CHANNEL );
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216 /* Enable receiver and transmitter... */
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217 AT91C_BASE_US0->US_CR = US_RXEN | US_TXEN;
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219 portEXIT_CRITICAL();
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223 xReturn = ( xComPortHandle ) 0;
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228 /*-----------------------------------------------------------*/
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230 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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232 /* The port handle is not required as this driver only supports UART0. */
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235 /* Get the next character from the buffer. Return false if no characters
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236 are available, or arrive before xBlockTime expires. */
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237 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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246 /*-----------------------------------------------------------*/
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248 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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250 signed char *pxNext;
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252 /* NOTE: This implementation does not handle the queue being full as no
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253 block time is used! */
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255 /* The port handle is not required as this driver only supports UART0. */
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257 ( void ) usStringLength;
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259 /* Send each character in the string, one at a time. */
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260 pxNext = ( signed char * ) pcString;
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263 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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267 /*-----------------------------------------------------------*/
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269 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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273 /* Place the character in the queue of characters to be transmitted. */
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274 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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279 /* Turn on the Tx interrupt so the ISR will remove the character from the
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280 queue and send it. This does not need to be in a critical section as
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281 if the interrupt has already removed the character the next interrupt
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282 will simply turn off the Tx interrupt again. */
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283 AT91C_BASE_US0->US_IER = US_TXRDY;
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287 /*-----------------------------------------------------------*/
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289 void vSerialClose( xComPortHandle xPort )
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291 /* Not supported as not required by the demo application. */
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294 /*-----------------------------------------------------------*/
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