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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98 + ISRcode removed. Is now pulled inline to reduce stack-usage.
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100 Changes from V3.0.1
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103 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER. */
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105 /* Scheduler header files. */
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106 #include "FreeRTOS.h"
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110 #include "serial.h"
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112 /* Hardware pin definitions. */
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113 #define serTX_PIN bTRC6
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114 #define serRX_PIN bTRC7
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116 /* Bit/register definitions. */
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117 #define serINPUT ( 1 )
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118 #define serOUTPUT ( 0 )
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119 #define serINTERRUPT_ENABLED ( 1 )
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121 /* All ISR's use the PIC18 low priority interrupt. */
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122 #define serLOW_PRIORITY ( 0 )
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124 /*-----------------------------------------------------------*/
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126 /* Queues to interface between comms API and interrupt routines. */
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127 QueueHandle_t xRxedChars;
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128 QueueHandle_t xCharsForTx;
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129 portBASE_TYPE xHigherPriorityTaskWoken;
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131 /*-----------------------------------------------------------*/
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133 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned char ucQueueLength )
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135 unsigned short usSPBRG;
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137 /* Create the queues used by the ISR's to interface to tasks. */
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138 xRxedChars = xQueueCreate( ucQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) );
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139 xCharsForTx = xQueueCreate( ucQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) );
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141 portENTER_CRITICAL();
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143 /* Setup the IO pins to enable the USART IO. */
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144 serTX_PIN = serINPUT; // YES really! See datasheet
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145 serRX_PIN = serINPUT;
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147 /* Set the TX config register. */
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148 TXSTA = 0b00100000;
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149 // ||||||||--bit0: TX9D = n/a
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150 // |||||||---bit1: TRMT = ReadOnly
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151 // ||||||----bit2: BRGH = High speed
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152 // |||||-----bit3: SENDB = n/a
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153 // ||||------bit4: SYNC = Asynchronous mode
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154 // |||-------bit5: TXEN = Transmit enable
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155 // ||--------bit6: TX9 = 8-bit transmission
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156 // |---------bit7: CSRC = n/a
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158 /* Set the Receive config register. */
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159 RCSTA = 0b10010000;
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160 // ||||||||--bit0: RX9D = ReadOnly
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161 // |||||||---bit1: OERR = ReadOnly
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162 // ||||||----bit2: FERR = ReadOnly
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163 // |||||-----bit3: ADDEN = n/a
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164 // ||||------bit4: CREN = Enable receiver
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165 // |||-------bit5: SREN = n/a
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166 // ||--------bit6: RX9 = 8-bit reception
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167 // |---------bit7: SPEN = Serial port enabled
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169 /* Calculate the baud rate generator value.
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170 We use low-speed (BRGH=0), the formula is
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171 SPBRG = ( ( FOSC / Desired Baud Rate ) / 64 ) - 1 */
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172 usSPBRG = ( ( APROCFREQ / ulWantedBaud ) / 64 ) - 1;
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173 if( usSPBRG > 255 )
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182 /* Set the serial interrupts to use the same priority as the tick. */
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183 bTXIP = serLOW_PRIORITY;
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184 bRCIP = serLOW_PRIORITY;
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186 /* Enable the Rx interrupt now, the Tx interrupt will get enabled when
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187 we have data to send. */
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188 bRCIE = serINTERRUPT_ENABLED;
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190 portEXIT_CRITICAL();
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192 /* Unlike other ports, this serial code does not allow for more than one
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193 com port. We therefore don't return a pointer to a port structure and
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194 can instead just return NULL. */
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197 /*-----------------------------------------------------------*/
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199 xComPortHandle xSerialPortInit( eCOMPort ePort, eBaud eWantedBaud, eParity eWantedParity, eDataBits eWantedDataBits, eStopBits eWantedStopBits, unsigned char ucBufferLength )
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201 /* This is not implemented in this port.
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202 Use xSerialPortInitMinimal() instead. */
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205 /*-----------------------------------------------------------*/
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207 portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, char *pcRxedChar, TickType_t xBlockTime )
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209 /* Get the next character from the buffer. Return false if no characters
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210 are available, or arrive before xBlockTime expires. */
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211 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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213 return ( char ) pdTRUE;
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216 return ( char ) pdFALSE;
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218 /*-----------------------------------------------------------*/
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220 portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, char cOutChar, TickType_t xBlockTime )
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222 /* Return false if after the block time there is no room on the Tx queue. */
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223 if( xQueueSend( xCharsForTx, ( const void * ) &cOutChar, xBlockTime ) != ( char ) pdPASS )
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228 /* Turn interrupt on - ensure the compiler only generates a single
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229 instruction for this. */
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230 bTXIE = serINTERRUPT_ENABLED;
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234 /*-----------------------------------------------------------*/
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236 void vSerialClose( xComPortHandle xPort )
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238 /* Not implemented for this port.
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239 To implement, turn off the interrupts and delete the memory
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240 allocated to the queues. */
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