FreeRTOS/Demo/CORTUS_APS3_GCC/Demo/serial.c - nest-detect/1.0.2/freertos - Git at Google

 /*
     FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
     All rights reserved

     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

     ***************************************************************************
      *                                                                       *
      *    FreeRTOS provides completely free yet professionally developed,    *
      *    robust, strictly quality controlled, supported, and cross          *
      *    platform software that has become a de facto standard.             *
      *                                                                       *
      *    Help yourself get started quickly and support the FreeRTOS         *
      *    project by purchasing a FreeRTOS tutorial book, reference          *
      *    manual, or both from: http://www.FreeRTOS.org/Documentation        *
      *                                                                       *
      *    Thank you!                                                         *
      *                                                                       *
     ***************************************************************************

     This file is part of the FreeRTOS distribution.

     FreeRTOS is free software; you can redistribute it and/or modify it under
     the terms of the GNU General Public License (version 2) as published by the
     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.

     >>!   NOTE: The modification to the GPL is included to allow you to     !<<
     >>!   distribute a combined work that includes FreeRTOS without being   !<<
     >>!   obliged to provide the source code for proprietary components     !<<
     >>!   outside of the FreeRTOS kernel.                                   !<<

     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
     FOR A PARTICULAR PURPOSE.  Full license text is available from the following
     link: http://www.freertos.org/a00114.html

     1 tab == 4 spaces!

     ***************************************************************************
      *                                                                       *
      *    Having a problem?  Start by reading the FAQ "My application does   *
      *    not run, what could be wrong?"                                     *
      *                                                                       *
      *    http://www.FreeRTOS.org/FAQHelp.html                               *
      *                                                                       *
     ***************************************************************************

     http://www.FreeRTOS.org - Documentation, books, training, latest versions,
     license and Real Time Engineers Ltd. contact details.

     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
     including FreeRTOS+Trace - an indispensable productivity tool, a DOS
     compatible FAT file system, and our tiny thread aware UDP/IP stack.

     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
     Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS
     licenses offer ticketed support, indemnification and middleware.

     http://www.SafeRTOS.com - High Integrity Systems also provide a safety
     engineered and independently SIL3 certified version for use in safety and
     mission critical applications that require provable dependability.

     1 tab == 4 spaces!
 */

 /*  Basic interrupt driven serial port driver for uart1.
 */

 /* Standard includes. */
 #include <stdlib.h>

 /* Kernel includes. */
 #include "FreeRTOS.h"
 #include "queue.h"
 #include "task.h"

 /* Demo application includes. */
 #include <machine/uart.h>
 #include <machine/ic.h>
 #include "serial.h"
 /*-----------------------------------------------------------*/

 #define comBLOCK_RETRY_TIME				10
 /*-----------------------------------------------------------*/

 /* The interrupt handlers are naked functions that call C handlers.  The C
 handlers are marked as noinline to ensure they work correctly when the
 optimiser is on. */
 void interrupt5_handler( void ) __attribute__((naked));
 static void prvTxHandler( void ) __attribute__((noinline));
 void interrupt6_handler( void ) __attribute__((naked));
 static void prvRxHandler( void ) __attribute__((noinline));

 /*-----------------------------------------------------------*/

 /* Queues used to hold received characters, and characters waiting to be
 transmitted. */
 static QueueHandle_t xRxedChars;
 static QueueHandle_t xCharsForTx;
 /*-----------------------------------------------------------*/

 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
 {
 	/* Create the queues used to hold Rx and Tx characters. */
 	xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
 	xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );

 	if( ( xRxedChars ) && ( xCharsForTx ) )
 	{
 		/* Set up interrupts */
 		/* tx interrupt will be enabled when we need to send something */
 		uart1->tx_mask = 0;
 		uart1->rx_mask = 1;
 		irq[IRQ_UART1_TX].ien = 1;
 		irq[IRQ_UART1_RX].ien = 1;
 	}

 	return ( xComPortHandle ) 0;
 }
 /*-----------------------------------------------------------*/

 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
 {
 	/* The port handle is not required as this driver only supports uart1. */
 	(void) pxPort;

 	/* Get the next character from the buffer.	Return false if no characters
 	   are available, or arrive before xBlockTime expires. */
 	if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
 	{
 		return pdTRUE;
 	}
 	else
 	{
 		return pdFALSE;
 	}
 }
 /*-----------------------------------------------------------*/

 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
 {
 	int i;
 	signed char *pChNext;

 	/* Send each character in the string, one at a time. */
 	pChNext = ( signed char * )pcString;
 	for( i = 0; i < usStringLength; i++ )
 	{
 		/* Block until character has been transmitted. */
 		while( xSerialPutChar( pxPort, *pChNext, comBLOCK_RETRY_TIME ) != pdTRUE ); pChNext++;
 	}
 }
 /*-----------------------------------------------------------*/

 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
 {
 	( void ) pxPort;

 	/* Place the character in the queue of characters to be transmitted. */
 	if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
 	{
 		return pdFAIL;
 	}

 	/* Turn on the Tx interrupt so the ISR will remove the character from the
 	   queue and send it. This does not need to be in a critical section as
 	   if the interrupt has already removed the character the next interrupt
 	   will simply turn off the Tx interrupt again. */
 	uart1->tx_mask = 1;

 	return pdPASS;
 }
 /*-----------------------------------------------------------*/

 void vSerialClose( xComPortHandle xPort )
 {
 	/* Not supported as not required by the demo application. */
 	( void ) xPort;
 }
 /*-----------------------------------------------------------*/

 /* UART Tx interrupt handler. */
 void interrupt5_handler( void )
 {
 	/* This is a naked function. */
 	portSAVE_CONTEXT();
 	prvTxHandler();
 	portRESTORE_CONTEXT();
 }
 /*-----------------------------------------------------------*/

 static void prvTxHandler( void )
 {
 signed char cChar;
 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

 	/* The interrupt was caused by the transmit fifo having space for at least one
 	character. Are there any more characters to transmit? */
 	if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
 	{
 		/* A character was retrieved from the queue so can be sent to the uart now. */
 		uart1->tx_data = cChar;
 	}
 	else
 	{
 		/* Queue empty, nothing to send so turn off the Tx interrupt. */
 		uart1->tx_mask = 0;
 	}

 	/* If an event caused a task to unblock then we call "Yield from ISR" to
 	ensure that the unblocked task is the task that executes when the interrupt
 	completes if the unblocked task has a priority higher than the interrupted
 	task. */
 	portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
 }
 /*-----------------------------------------------------------*/

 /* UART Rx interrupt. */
 void interrupt6_handler( void )
 {
 	portSAVE_CONTEXT();
 	prvRxHandler();
 	portRESTORE_CONTEXT();
 }
 /*-----------------------------------------------------------*/

 static void prvRxHandler( void )
 {
 signed char cChar;
 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

 	/* The interrupt was caused by the receiver getting data. */
 	cChar = uart1->rx_data;

 	xQueueSendFromISR(xRxedChars, &cChar, &xHigherPriorityTaskWoken );

 	/* If an event caused a task to unblock then we call "Yield from ISR" to
 	ensure that the unblocked task is the task that executes when the interrupt
 	completes if the unblocked task has a priority higher than the interrupted
 	task. */
 	portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
 }
 /*-----------------------------------------------------------*/
	/*
	FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
	All rights reserved

	VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

	***************************************************************************
	* *
	* FreeRTOS provides completely free yet professionally developed, *
	* robust, strictly quality controlled, supported, and cross *
	* platform software that has become a de facto standard. *
	* *
	* Help yourself get started quickly and support the FreeRTOS *
	* project by purchasing a FreeRTOS tutorial book, reference *
	* manual, or both from: http://www.FreeRTOS.org/Documentation *
	* *
	* Thank you! *
	* *
	***************************************************************************

	This file is part of the FreeRTOS distribution.

	FreeRTOS is free software; you can redistribute it and/or modify it under
	the terms of the GNU General Public License (version 2) as published by the
	Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.

	>>! NOTE: The modification to the GPL is included to allow you to !<<
	>>! distribute a combined work that includes FreeRTOS without being !<<
	>>! obliged to provide the source code for proprietary components !<<
	>>! outside of the FreeRTOS kernel. !<<

	FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
	FOR A PARTICULAR PURPOSE. Full license text is available from the following
	link: http://www.freertos.org/a00114.html

	1 tab == 4 spaces!

	***************************************************************************
	* *
	* Having a problem? Start by reading the FAQ "My application does *
	* not run, what could be wrong?" *
	* *
	* http://www.FreeRTOS.org/FAQHelp.html *
	* *
	***************************************************************************

	http://www.FreeRTOS.org - Documentation, books, training, latest versions,
	license and Real Time Engineers Ltd. contact details.

	http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
	including FreeRTOS+Trace - an indispensable productivity tool, a DOS
	compatible FAT file system, and our tiny thread aware UDP/IP stack.

	http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
	Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
	licenses offer ticketed support, indemnification and middleware.

	http://www.SafeRTOS.com - High Integrity Systems also provide a safety
	engineered and independently SIL3 certified version for use in safety and
	mission critical applications that require provable dependability.

	1 tab == 4 spaces!
	*/

	/* Basic interrupt driven serial port driver for uart1.
	*/

	/* Standard includes. */
	#include <stdlib.h>

	/* Kernel includes. */
	#include "FreeRTOS.h"
	#include "queue.h"
	#include "task.h"

	/* Demo application includes. */
	#include <machine/uart.h>
	#include <machine/ic.h>
	#include "serial.h"
	/-----------------------------------------------------------/

	#define comBLOCK_RETRY_TIME 10
	/-----------------------------------------------------------/

	/* The interrupt handlers are naked functions that call C handlers. The C
	handlers are marked as noinline to ensure they work correctly when the
	optimiser is on. */
	void interrupt5_handler( void ) __attribute__((naked));
	static void prvTxHandler( void ) __attribute__((noinline));
	void interrupt6_handler( void ) __attribute__((naked));
	static void prvRxHandler( void ) __attribute__((noinline));

	/-----------------------------------------------------------/

	/* Queues used to hold received characters, and characters waiting to be
	transmitted. */
	static QueueHandle_t xRxedChars;
	static QueueHandle_t xCharsForTx;
	/-----------------------------------------------------------/

	xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
	{
	/* Create the queues used to hold Rx and Tx characters. */
	xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
	xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );

	if( ( xRxedChars ) && ( xCharsForTx ) )
	{
	/* Set up interrupts */
	/* tx interrupt will be enabled when we need to send something */
	uart1->tx_mask = 0;
	uart1->rx_mask = 1;
	irq[IRQ_UART1_TX].ien = 1;
	irq[IRQ_UART1_RX].ien = 1;
	}

	return ( xComPortHandle ) 0;
	}
	/-----------------------------------------------------------/

	signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
	{
	/* The port handle is not required as this driver only supports uart1. */
	(void) pxPort;

	/* Get the next character from the buffer. Return false if no characters
	are available, or arrive before xBlockTime expires. */
	if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
	{
	return pdTRUE;
	}
	else
	{
	return pdFALSE;
	}
	}
	/-----------------------------------------------------------/

	void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
	{
	int i;
	signed char *pChNext;

	/* Send each character in the string, one at a time. */
	pChNext = ( signed char * )pcString;
	for( i = 0; i < usStringLength; i++ )
	{
	/* Block until character has been transmitted. */
	while( xSerialPutChar( pxPort, *pChNext, comBLOCK_RETRY_TIME ) != pdTRUE ); pChNext++;
	}
	}
	/-----------------------------------------------------------/

	signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
	{
	( void ) pxPort;

	/* Place the character in the queue of characters to be transmitted. */
	if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
	{
	return pdFAIL;
	}

	/* Turn on the Tx interrupt so the ISR will remove the character from the
	queue and send it. This does not need to be in a critical section as
	if the interrupt has already removed the character the next interrupt
	will simply turn off the Tx interrupt again. */
	uart1->tx_mask = 1;

	return pdPASS;
	}
	/-----------------------------------------------------------/

	void vSerialClose( xComPortHandle xPort )
	{
	/* Not supported as not required by the demo application. */
	( void ) xPort;
	}
	/-----------------------------------------------------------/

	/* UART Tx interrupt handler. */
	void interrupt5_handler( void )
	{
	/* This is a naked function. */
	portSAVE_CONTEXT();
	prvTxHandler();
	portRESTORE_CONTEXT();
	}
	/-----------------------------------------------------------/

	static void prvTxHandler( void )
	{
	signed char cChar;
	portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

	/* The interrupt was caused by the transmit fifo having space for at least one
	character. Are there any more characters to transmit? */
	if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
	{
	/* A character was retrieved from the queue so can be sent to the uart now. */
	uart1->tx_data = cChar;
	}
	else
	{
	/* Queue empty, nothing to send so turn off the Tx interrupt. */
	uart1->tx_mask = 0;
	}

	/* If an event caused a task to unblock then we call "Yield from ISR" to
	ensure that the unblocked task is the task that executes when the interrupt
	completes if the unblocked task has a priority higher than the interrupted
	task. */
	portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
	}
	/-----------------------------------------------------------/

	/* UART Rx interrupt. */
	void interrupt6_handler( void )
	{
	portSAVE_CONTEXT();
	prvRxHandler();
	portRESTORE_CONTEXT();
	}
	/-----------------------------------------------------------/

	static void prvRxHandler( void )
	{
	signed char cChar;
	portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

	/* The interrupt was caused by the receiver getting data. */
	cChar = uart1->rx_data;

	xQueueSendFromISR(xRxedChars, &cChar, &xHigherPriorityTaskWoken );

	/* If an event caused a task to unblock then we call "Yield from ISR" to
	ensure that the unblocked task is the task that executes when the interrupt
	completes if the unblocked task has a priority higher than the interrupted
	task. */
	portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
	}
	/-----------------------------------------------------------/