2 FreeRTOS V9.0.0 - Copyright (C) 2016 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 ***************************************************************************
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14 >>! NOTE: The modification to the GPL is included to allow you to !<<
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15 >>! distribute a combined work that includes FreeRTOS without being !<<
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16 >>! obliged to provide the source code for proprietary components !<<
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17 >>! outside of the FreeRTOS kernel. !<<
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18 ***************************************************************************
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20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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23 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * FreeRTOS provides completely free yet professionally developed, *
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28 * robust, strictly quality controlled, supported, and cross *
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29 * platform software that is more than just the market leader, it *
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30 * is the industry's de facto standard. *
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32 * Help yourself get started quickly while simultaneously helping *
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33 * to support the FreeRTOS project by purchasing a FreeRTOS *
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34 * tutorial book, reference manual, or both: *
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35 * http://www.FreeRTOS.org/Documentation *
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37 ***************************************************************************
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39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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40 the FAQ page "My application does not run, what could be wrong?". Have you
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41 defined configASSERT()?
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43 http://www.FreeRTOS.org/support - In return for receiving this top quality
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44 embedded software for free we request you assist our global community by
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45 participating in the support forum.
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47 http://www.FreeRTOS.org/training - Investing in training allows your team to
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48 be as productive as possible as early as possible. Now you can receive
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49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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50 Ltd, and the world's leading authority on the world's leading RTOS.
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52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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61 licenses offer ticketed support, indemnification and commercial middleware.
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63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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64 engineered and independently SIL3 certified version for use in safety and
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65 mission critical applications that require provable dependability.
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70 /* NOTE: This is just a test file and not intended to be a generic
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73 #include "altera_avalon_uart.h"
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74 #include "altera_avalon_uart_regs.h"
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75 #include "sys/alt_irq.h"
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77 #include "FreeRTOS.h"
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81 /*---------------------------------------------------------------------------*/
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83 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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84 #define serNO_BLOCK ( ( TickType_t ) 0 )
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85 /*---------------------------------------------------------------------------*/
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87 static QueueHandle_t xRxedChars;
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88 static QueueHandle_t xCharsForTx;
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90 alt_u32 uartControl;
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91 /*---------------------------------------------------------------------------*/
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93 static void vUARTInterruptHandler( void* context, alt_u32 id );
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94 static void vUARTReceiveHandler( alt_u32 status );
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95 static void vUARTTransmitHandler( alt_u32 status );
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96 /*---------------------------------------------------------------------------*/
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98 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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100 /* Create the queues used to hold Rx and Tx characters. */
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101 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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102 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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104 /* If the queues were created correctly then setup the serial port hardware. */
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105 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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107 portENTER_CRITICAL();
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109 uartControl = ALTERA_AVALON_UART_CONTROL_RTS_MSK | ALTERA_AVALON_UART_CONTROL_RRDY_MSK | ALTERA_AVALON_UART_CONTROL_DCTS_MSK;
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110 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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112 /* register the interrupt handler */
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113 alt_irq_register ( UART_IRQ, NULL, vUARTInterruptHandler );
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115 portEXIT_CRITICAL();
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119 return ( xComPortHandle ) 0;
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121 return ( xComPortHandle ) 1;
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123 /*---------------------------------------------------------------------------*/
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125 void vSerialClose( xComPortHandle xPort )
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129 /*---------------------------------------------------------------------------*/
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131 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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133 /* The port handle is not required as this driver only supports one port. */
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137 /* Get the next character from the buffer. Return false if no characters
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138 are available, or arrive before xBlockTime expires. */
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139 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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145 uartControl |= ALTERA_AVALON_UART_CONTROL_RRDY_MSK;
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146 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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150 /*---------------------------------------------------------------------------*/
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152 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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154 signed portBASE_TYPE lReturn = pdPASS;
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156 /* Place the character in the queue of characters to be transmitted. */
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157 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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159 /*Triggers an interrupt on every character or (down) when queue is full. */
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160 uartControl |= ALTERA_AVALON_UART_CONTROL_TRDY_MSK;
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161 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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170 /*---------------------------------------------------------------------------*/
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172 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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174 signed char *pxNext;
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176 /* A couple of parameters that this port does not use. */
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177 ( void ) usStringLength;
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180 /* NOTE: This implementation does not handle the queue being full as no block time is used! */
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182 /* The port handle is not required as this driver only supports UART0. */
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185 /* Send each character in the string, one at a time. */
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186 pxNext = ( signed char * ) pcString;
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189 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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193 /*-----------------------------------------------------------*/
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195 static void vUARTInterruptHandler( void* context, alt_u32 id )
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199 /* Read the status register in order to determine the cause of the
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201 status = IORD_ALTERA_AVALON_UART_STATUS( UART_BASE );
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203 /* Clear any error flags set at the device */
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204 IOWR_ALTERA_AVALON_UART_STATUS( UART_BASE, 0 );
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206 /* process a read irq */
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207 if ( status & ALTERA_AVALON_UART_STATUS_RRDY_MSK )
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209 vUARTReceiveHandler( status );
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212 /* process a write irq */
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213 if ( status & ( ALTERA_AVALON_UART_STATUS_TRDY_MSK ) )
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215 vUARTTransmitHandler( status );
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218 /*---------------------------------------------------------------------------*/
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220 static void vUARTReceiveHandler( alt_u32 status )
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223 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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225 /* If there was an error, discard the data */
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226 if ( status & ( ALTERA_AVALON_UART_STATUS_PE_MSK | ALTERA_AVALON_UART_STATUS_FE_MSK ) )
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232 /* Transfer data from the device to the circular buffer */
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233 cChar = IORD_ALTERA_AVALON_UART_RXDATA( UART_BASE );
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234 if ( pdTRUE != xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ) )
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236 /* If the circular buffer was full, disable interrupts. Interrupts will
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237 be re-enabled when data is removed from the buffer. */
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238 uartControl &= ~ALTERA_AVALON_UART_CONTROL_RRDY_MSK;
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239 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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242 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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244 /*---------------------------------------------------------------------------*/
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246 static void vUARTTransmitHandler( alt_u32 status )
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249 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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250 /* Transfer data if there is some ready to be transferred */
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251 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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253 IOWR_ALTERA_AVALON_UART_TXDATA( UART_BASE, cChar );
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257 uartControl &= ~ALTERA_AVALON_UART_CONTROL_TRDY_MSK;
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260 IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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261 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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263 /*---------------------------------------------------------------------------*/
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