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231 lines
7.2 KiB
C
231 lines
7.2 KiB
C
/*
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* FreeRTOS Kernel V10.0.0
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* Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software. If you wish to use our Amazon
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* FreeRTOS name, please do so in a fair use way that does not cause confusion.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
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NOTE: This driver is primarily to test the scheduler functionality. It does
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not effectively use the buffers or DMA and is therefore not intended to be
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an example of an efficient driver. */
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/* Standard include file. */
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#include <stdlib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "task.h"
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/* Demo app include files. */
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#include "serial.h"
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/* Hardware setup. */
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#define serOUTPUT 0
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#define serINPUT 1
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#define serLOW_SPEED 0
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#define serONE_STOP_BIT 0
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#define serEIGHT_DATA_BITS_NO_PARITY 0
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#define serNORMAL_IDLE_STATE 0
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#define serAUTO_BAUD_OFF 0
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#define serLOOPBACK_OFF 0
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#define serWAKE_UP_DISABLE 0
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#define serNO_HARDWARE_FLOW_CONTROL 0
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#define serSTANDARD_IO 0
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#define serNO_IRDA 0
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#define serCONTINUE_IN_IDLE_MODE 0
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#define serUART_ENABLED 1
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#define serINTERRUPT_ON_SINGLE_CHAR 0
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#define serTX_ENABLE 1
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#define serINTERRUPT_ENABLE 1
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#define serINTERRUPT_DISABLE 0
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#define serCLEAR_FLAG 0
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#define serSET_FLAG 1
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/* The queues used to communicate between tasks and ISR's. */
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static QueueHandle_t xRxedChars;
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static QueueHandle_t xCharsForTx;
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static portBASE_TYPE xTxHasEnded;
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/*-----------------------------------------------------------*/
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xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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{
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char cChar;
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/* Create the queues used by the com test task. */
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xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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/* Setup the UART. */
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U2MODEbits.BRGH = serLOW_SPEED;
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U2MODEbits.STSEL = serONE_STOP_BIT;
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U2MODEbits.PDSEL = serEIGHT_DATA_BITS_NO_PARITY;
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U2MODEbits.RXINV = serNORMAL_IDLE_STATE;
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U2MODEbits.ABAUD = serAUTO_BAUD_OFF;
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U2MODEbits.LPBACK = serLOOPBACK_OFF;
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U2MODEbits.WAKE = serWAKE_UP_DISABLE;
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U2MODEbits.UEN = serNO_HARDWARE_FLOW_CONTROL;
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U2MODEbits.IREN = serNO_IRDA;
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U2MODEbits.USIDL = serCONTINUE_IN_IDLE_MODE;
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U2MODEbits.UARTEN = serUART_ENABLED;
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U2BRG = (unsigned short)(( (float)configCPU_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5);
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U2STAbits.URXISEL = serINTERRUPT_ON_SINGLE_CHAR;
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U2STAbits.UTXEN = serTX_ENABLE;
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U2STAbits.UTXINV = serNORMAL_IDLE_STATE;
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U2STAbits.UTXISEL0 = serINTERRUPT_ON_SINGLE_CHAR;
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U2STAbits.UTXISEL1 = serINTERRUPT_ON_SINGLE_CHAR;
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/* It is assumed that this function is called prior to the scheduler being
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started. Therefore interrupts must not be allowed to occur yet as they
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may attempt to perform a context switch. */
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portDISABLE_INTERRUPTS();
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IFS1bits.U2RXIF = serCLEAR_FLAG;
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IFS1bits.U2TXIF = serCLEAR_FLAG;
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IPC7bits.U2RXIP = configKERNEL_INTERRUPT_PRIORITY;
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IPC7bits.U2TXIP = configKERNEL_INTERRUPT_PRIORITY;
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IEC1bits.U2TXIE = serINTERRUPT_ENABLE;
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IEC1bits.U2RXIE = serINTERRUPT_ENABLE;
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/* Clear the Rx buffer. */
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while( U2STAbits.URXDA == serSET_FLAG )
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{
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cChar = U2RXREG;
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}
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xTxHasEnded = pdTRUE;
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return NULL;
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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{
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/* Only one port is supported. */
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( void ) pxPort;
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/* Get the next character from the buffer. Return false if no characters
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are available or arrive before xBlockTime expires. */
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if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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{
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return pdTRUE;
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}
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else
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{
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return pdFALSE;
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}
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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{
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/* Only one port is supported. */
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( void ) pxPort;
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/* Return false if after the block time there is no room on the Tx queue. */
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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{
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return pdFAIL;
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}
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/* A critical section should not be required as xTxHasEnded will not be
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written to by the ISR if it is already 0 (is this correct?). */
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if( xTxHasEnded )
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{
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xTxHasEnded = pdFALSE;
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IFS1bits.U2TXIF = serSET_FLAG;
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}
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return pdPASS;
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}
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/*-----------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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/* Note implemented. */
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( void ) xPort;
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}
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/*-----------------------------------------------------------*/
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void __attribute__((__interrupt__, auto_psv)) _U2RXInterrupt( void )
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{
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char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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/* Get the character and post it on the queue of Rxed characters.
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If the post causes a task to wake force a context switch as the woken task
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may have a higher priority than the task we have interrupted. */
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IFS1bits.U2RXIF = serCLEAR_FLAG;
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while( U2STAbits.URXDA )
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{
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cChar = U2RXREG;
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xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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}
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if( xHigherPriorityTaskWoken != pdFALSE )
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{
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taskYIELD();
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}
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}
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/*-----------------------------------------------------------*/
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void __attribute__((__interrupt__, auto_psv)) _U2TXInterrupt( void )
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{
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signed char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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/* If the transmit buffer is full we cannot get the next character.
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Another interrupt will occur the next time there is space so this does
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not matter. */
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IFS1bits.U2TXIF = serCLEAR_FLAG;
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while( !( U2STAbits.UTXBF ) )
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{
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if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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/* Send the next character queued for Tx. */
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U2TXREG = cChar;
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}
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else
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{
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/* Queue empty, nothing to send. */
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xTxHasEnded = pdTRUE;
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break;
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}
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}
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if( xHigherPriorityTaskWoken != pdFALSE )
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{
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taskYIELD();
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}
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}
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