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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96 /* NOTE: This is just a test file and not intended to be a generic
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99 #include "altera_avalon_uart.h"
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100 #include "altera_avalon_uart_regs.h"
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101 #include "sys/alt_irq.h"
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103 #include "FreeRTOS.h"
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105 #include "system.h"
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106 #include "Serial.h"
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107 /*---------------------------------------------------------------------------*/
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109 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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110 #define serNO_BLOCK ( ( TickType_t ) 0 )
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111 /*---------------------------------------------------------------------------*/
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113 static QueueHandle_t xRxedChars;
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114 static QueueHandle_t xCharsForTx;
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116 alt_u32 uartControl;
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117 /*---------------------------------------------------------------------------*/
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119 static void vUARTInterruptHandler( void* context, alt_u32 id );
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120 static void vUARTReceiveHandler( alt_u32 status );
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121 static void vUARTTransmitHandler( alt_u32 status );
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122 /*---------------------------------------------------------------------------*/
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124 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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126 /* Create the queues used to hold Rx and Tx characters. */
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127 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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128 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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130 /* If the queues were created correctly then setup the serial port hardware. */
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131 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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133 portENTER_CRITICAL();
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135 uartControl = ALTERA_AVALON_UART_CONTROL_RTS_MSK | ALTERA_AVALON_UART_CONTROL_RRDY_MSK | ALTERA_AVALON_UART_CONTROL_DCTS_MSK;
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136 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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138 /* register the interrupt handler */
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139 alt_irq_register ( UART_IRQ, NULL, vUARTInterruptHandler );
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141 portEXIT_CRITICAL();
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145 return ( xComPortHandle ) 0;
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147 return ( xComPortHandle ) 1;
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149 /*---------------------------------------------------------------------------*/
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151 void vSerialClose( xComPortHandle xPort )
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155 /*---------------------------------------------------------------------------*/
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157 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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159 /* The port handle is not required as this driver only supports one port. */
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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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171 uartControl |= ALTERA_AVALON_UART_CONTROL_RRDY_MSK;
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172 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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176 /*---------------------------------------------------------------------------*/
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178 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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180 signed portBASE_TYPE lReturn = pdPASS;
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182 /* Place the character in the queue of characters to be transmitted. */
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183 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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185 /*Triggers an interrupt on every character or (down) when queue is full. */
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186 uartControl |= ALTERA_AVALON_UART_CONTROL_TRDY_MSK;
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187 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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196 /*---------------------------------------------------------------------------*/
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198 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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200 signed char *pxNext;
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202 /* A couple of parameters that this port does not use. */
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203 ( void ) usStringLength;
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206 /* NOTE: This implementation does not handle the queue being full as no block time is used! */
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208 /* The port handle is not required as this driver only supports UART0. */
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211 /* Send each character in the string, one at a time. */
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212 pxNext = ( signed char * ) pcString;
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215 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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219 /*-----------------------------------------------------------*/
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221 static void vUARTInterruptHandler( void* context, alt_u32 id )
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225 /* Read the status register in order to determine the cause of the
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227 status = IORD_ALTERA_AVALON_UART_STATUS( UART_BASE );
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229 /* Clear any error flags set at the device */
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230 IOWR_ALTERA_AVALON_UART_STATUS( UART_BASE, 0 );
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232 /* process a read irq */
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233 if ( status & ALTERA_AVALON_UART_STATUS_RRDY_MSK )
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235 vUARTReceiveHandler( status );
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238 /* process a write irq */
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239 if ( status & ( ALTERA_AVALON_UART_STATUS_TRDY_MSK ) )
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241 vUARTTransmitHandler( status );
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244 /*---------------------------------------------------------------------------*/
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246 static void vUARTReceiveHandler( alt_u32 status )
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249 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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251 /* If there was an error, discard the data */
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252 if ( status & ( ALTERA_AVALON_UART_STATUS_PE_MSK | ALTERA_AVALON_UART_STATUS_FE_MSK ) )
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258 /* Transfer data from the device to the circular buffer */
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259 cChar = IORD_ALTERA_AVALON_UART_RXDATA( UART_BASE );
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260 if ( pdTRUE != xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ) )
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262 /* If the circular buffer was full, disable interrupts. Interrupts will
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263 be re-enabled when data is removed from the buffer. */
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264 uartControl &= ~ALTERA_AVALON_UART_CONTROL_RRDY_MSK;
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265 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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268 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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270 /*---------------------------------------------------------------------------*/
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272 static void vUARTTransmitHandler( alt_u32 status )
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275 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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276 /* Transfer data if there is some ready to be transferred */
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277 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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279 IOWR_ALTERA_AVALON_UART_TXDATA( UART_BASE, cChar );
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283 uartControl &= ~ALTERA_AVALON_UART_CONTROL_TRDY_MSK;
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286 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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287 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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289 /*---------------------------------------------------------------------------*/
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