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/*
FreeRTOS V8.1.2 - 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!
*/
#include <device.h>
#include "FreeRTOS.h"
#include "queue.h"
#include "task.h"
#include "serial.h"
/*---------------------------------------------------------------------------*/
#define serialSTRING_DELAY_TICKS ( portMAX_DELAY )
/*---------------------------------------------------------------------------*/
CY_ISR_PROTO( vUartRxISR );
CY_ISR_PROTO( vUartTxISR );
/*---------------------------------------------------------------------------*/
static QueueHandle_t xSerialTxQueue = NULL;
static QueueHandle_t xSerialRxQueue = NULL;
/*---------------------------------------------------------------------------*/
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
/* Configure Rx. */
xSerialRxQueue = xQueueCreate( uxQueueLength, sizeof( signed char ) );
isr_UART1_RX_BYTE_RECEIVED_ClearPending();
isr_UART1_RX_BYTE_RECEIVED_StartEx(vUartRxISR);
/* Configure Tx */
xSerialTxQueue = xQueueCreate( uxQueueLength, sizeof( signed char ) );
isr_UART1_TX_BYTE_COMPLETE_ClearPending() ;
isr_UART1_TX_BYTE_COMPLETE_StartEx(vUartTxISR);
/* Clear the interrupt modes for the Tx for the time being. */
UART_1_SetTxInterruptMode( 0 );
/* Both configured successfully. */
return ( xComPortHandle )( xSerialTxQueue && xSerialRxQueue );
}
/*---------------------------------------------------------------------------*/
void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
{
unsigned short usIndex = 0;
for( usIndex = 0; usIndex < usStringLength; usIndex++ )
{
/* Check for pre-mature end of line. */
if( '\0' == pcString[ usIndex ] )
{
break;
}
/* Send out, one character at a time. */
if( pdTRUE != xSerialPutChar( NULL, pcString[ usIndex ], serialSTRING_DELAY_TICKS ) )
{
/* Failed to send, this will be picked up in the receive comtest task. */
}
}
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
{
portBASE_TYPE xReturn = pdFALSE;
if( pdTRUE == xQueueReceive( xSerialRxQueue, pcRxedChar, xBlockTime ) )
{
/* Picked up a character. */
xReturn = pdTRUE;
}
return xReturn;
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
{
portBASE_TYPE xReturn = pdFALSE;
/* The ISR is processing characters is so just add to the end of the queue. */
if( pdTRUE == xQueueSend( xSerialTxQueue, &cOutChar, xBlockTime ) )
{
xReturn = pdTRUE;
}
else
{
/* The queue is probably full. */
xReturn = pdFALSE;
}
/* Make sure that the interrupt will fire in the case where:
Currently sending so the Tx Complete will fire.
Not sending so the Empty will fire. */
taskENTER_CRITICAL();
UART_1_SetTxInterruptMode( UART_1_TX_STS_COMPLETE | UART_1_TX_STS_FIFO_EMPTY );
taskEXIT_CRITICAL();
return xReturn;
}
/*---------------------------------------------------------------------------*/
CY_ISR(vUartRxISR)
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
volatile unsigned char ucStatus = 0;
signed char cInChar = 0;
unsigned long ulMask = 0;
/* Read the status to acknowledge. */
ucStatus = UART_1_ReadRxStatus();
/* Only interested in a character being received. */
if( 0 != ( ucStatus & UART_1_RX_STS_FIFO_NOTEMPTY ) )
{
/* Get the character. */
cInChar = UART_1_GetChar();
/* Mask off the other RTOS interrupts to interact with the queue. */
ulMask = portSET_INTERRUPT_MASK_FROM_ISR();
{
/* Try to deliver the character. */
if( pdTRUE != xQueueSendFromISR( xSerialRxQueue, &cInChar, &xHigherPriorityTaskWoken ) )
{
/* Run out of space. */
}
}
portCLEAR_INTERRUPT_MASK_FROM_ISR( ulMask );
}
/* If we delivered the character then a context switch might be required.
xHigherPriorityTaskWoken was set to pdFALSE on interrupt entry. If calling
xQueueSendFromISR() caused a task to unblock, and the unblocked task has
a priority equal to or higher than the currently running task (the task this
ISR interrupted), then xHigherPriorityTaskWoken will have been set to pdTRUE and
portEND_SWITCHING_ISR() will request a context switch to the newly unblocked
task. */
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
CY_ISR(vUartTxISR)
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
volatile unsigned char ucStatus = 0;
signed char cOutChar = 0;
unsigned long ulMask = 0;
/* Read the status to acknowledge. */
ucStatus = UART_1_ReadTxStatus();
/* Check to see whether this is a genuine interrupt. */
if( ( 0 != ( ucStatus & UART_1_TX_STS_COMPLETE ) ) || ( 0 != ( ucStatus & UART_1_TX_STS_FIFO_EMPTY ) ) )
{
/* Mask off the other RTOS interrupts to interact with the queue. */
ulMask = portSET_INTERRUPT_MASK_FROM_ISR();
{
if( pdTRUE == xQueueReceiveFromISR( xSerialTxQueue, &cOutChar, &xHigherPriorityTaskWoken ) )
{
/* Send the next character. */
UART_1_PutChar( cOutChar );
/* If we are firing, then the only interrupt we are interested in
is the Complete. The application code will add the Empty interrupt
when there is something else to be done. */
UART_1_SetTxInterruptMode( UART_1_TX_STS_COMPLETE );
}
else
{
/* There is no work left so disable the interrupt until the application
puts more into the queue. */
UART_1_SetTxInterruptMode( 0 );
}
}
portCLEAR_INTERRUPT_MASK_FROM_ISR( ulMask );
}
/* If we delivered the character then a context switch might be required.
xHigherPriorityTaskWoken was set to pdFALSE on interrupt entry. If calling
xQueueSendFromISR() caused a task to unblock, and the unblocked task has
a priority equal to or higher than the currently running task (the task this
ISR interrupted), then xHigherPriorityTaskWoken will have been set to pdTRUE and
portEND_SWITCHING_ISR() will request a context switch to the newly unblocked
task. */
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
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