mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-04-20 05:21:59 -04:00
237 lines
8.9 KiB
C
237 lines
8.9 KiB
C
/*
|
|
FreeRTOS V6.0.5 - Copyright (C) 2010 Real Time Engineers Ltd.
|
|
|
|
***************************************************************************
|
|
* *
|
|
* If you are: *
|
|
* *
|
|
* + New to FreeRTOS, *
|
|
* + Wanting to learn FreeRTOS or multitasking in general quickly *
|
|
* + Looking for basic training, *
|
|
* + Wanting to improve your FreeRTOS skills and productivity *
|
|
* *
|
|
* then take a look at the FreeRTOS eBook *
|
|
* *
|
|
* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
|
|
* http://www.FreeRTOS.org/Documentation *
|
|
* *
|
|
* A pdf reference manual is also available. Both are usually delivered *
|
|
* to your inbox within 20 minutes to two hours when purchased between 8am *
|
|
* and 8pm GMT (although please allow up to 24 hours in case of *
|
|
* exceptional circumstances). Thank you for your support! *
|
|
* *
|
|
***************************************************************************
|
|
|
|
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 exception 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. See the GNU General Public License for
|
|
more details. You should have received a copy of the GNU General Public
|
|
License and the FreeRTOS license exception along with FreeRTOS; if not it
|
|
can be viewed here: http://www.freertos.org/a00114.html and also obtained
|
|
by writing to Richard Barry, contact details for whom are available on the
|
|
FreeRTOS WEB site.
|
|
|
|
1 tab == 4 spaces!
|
|
|
|
http://www.FreeRTOS.org - Documentation, latest information, license and
|
|
contact details.
|
|
|
|
http://www.SafeRTOS.com - A version that is certified for use in safety
|
|
critical systems.
|
|
|
|
http://www.OpenRTOS.com - Commercial support, development, porting,
|
|
licensing and training services.
|
|
*/
|
|
|
|
/* 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 xQueueHandle xRxedChars;
|
|
static xQueueHandle xCharsForTx;
|
|
extern unsigned portBASE_TYPE *pxVectorTable;
|
|
/*-----------------------------------------------------------*/
|
|
|
|
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_TX].ipl = portSYSTEM_INTERRUPT_PRIORITY_LEVEL;
|
|
irq[IRQ_UART1_RX].ien = 1;
|
|
irq[IRQ_UART1_RX].ipl = portSYSTEM_INTERRUPT_PRIORITY_LEVEL;
|
|
}
|
|
|
|
return ( xComPortHandle ) 0;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType 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, portTickType 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 );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
|