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/*
* FreeRTOS Kernel V10.4.1
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 1 tab == 4 spaces!
*/
/* Hardware specific includes. */
#include <tc1782.h>
#include <machine/intrinsics.h>
#include <machine/cint.h>
#include <machine/wdtcon.h>
/* Scheduler Includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
/* Demo Includes. */
#include "serial.h"
/*****************************************************************************
* Please note!
*
* This file is here to provide a means of generating interrupts to test the
* FreeRTOS tricore port. First - it configures the UART into loopback mode,
* and has only been used in loopback mode. Therefore, the baud rate
* calculation used has never been verified for correctness. Second -
* characters are passed into and out of the interrupt service routines using
* character queues. This provides a good test of the interrupt interaction,
* context switching mechanism, and kernel loading, it is however highly
* inefficient if the UART is being used to handle even moderate amounts of
* data throughput.
*/
/*---------------------------------------------------------------------------*/
/*
* See if the Serial Transmit Interrupt is currently activated, meaning that
* the interrupt is working through the back log of bytes that it needs to
* send. If the ISR is not enabled, then it will be triggered to send the first
* byte, and it will be automatically re-triggered when that byte has been
* sent. When the queue is exhausted, the ISR disables itself.
*/
static void prvCheckTransmit( void );
/*
* The transmit and receive interrupt handlers.
*/
static void prvTxBufferInterruptHandler( int iArg ) __attribute__( ( longcall ) );
static void prvRxInterruptHandler( int iArg )__attribute__( ( longcall ) );
/*-----------------------------------------------------------*/
/* Queues used to pass bytes into and out of the interrupt handlers.
NOTE: This is not intended to be an example of an efficient interrupt handler,
but instead to load the kernel and interrupt mechanisms in order to test the
FreeRTOS port. Using a FIFO, DMA, circular buffer, etc. architecture will
to improve efficiency. */
static QueueHandle_t xSerialTransmitQueue = NULL;
static QueueHandle_t xSerialReceiveQueue = NULL;
static volatile portBASE_TYPE xTransmitStatus = 0UL;
/*-----------------------------------------------------------*/
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
unsigned long ulReloadValue = 0UL;
ulReloadValue = ( configPERIPHERAL_CLOCK_HZ / ( 48UL * ulWantedBaud ) ) - 1UL;
if( NULL == xSerialTransmitQueue )
{
xSerialTransmitQueue = xQueueCreate( uxQueueLength, sizeof( char ) );
xSerialReceiveQueue = xQueueCreate( uxQueueLength, sizeof( char ) );
}
/* Enable ASC0 Module. */
unlock_wdtcon();
{
while ( 0 != ( WDT_CON0.reg & 0x1UL ) );
ASC0_CLC.reg = 0x0200UL;
}
lock_wdtcon();
/* Disable the Operation. */
ASC0_CON.reg &= 0xFFFF7FFF;
/* Set-up the GPIO Ports. */
P3_IOCR0.reg = 0x00009000; /* 3.0 ASC In, 3.1 Alt ASC Out */
/* Write the baud rate. */
ASC0_BG.reg = ulReloadValue;
/* Reconfigure and re-initialise the Operation. */
ASC0_PISEL.reg = 0UL;
ASC0_CON.reg = 0UL;
ASC0_CON.bits.M = 0x01; /* 8bit async. */
ASC0_CON.bits.REN = 0x01; /* Receiver enabled. */
ASC0_CON.bits.FDE = 0x01; /* Fractional divider enabled. */
ASC0_CON.bits.BRS = 0x01; /* Divide by three. */
ASC0_CON.bits.LB = 0x01; /* Loopback enabled. */
ASC0_CON.bits.R = 0x01; /* Enable the baud rate generator. */
/* Install the Tx interrupt. */
if( 0 != _install_int_handler( configINTERRUPT_PRIORITY_TX, prvTxBufferInterruptHandler, 0 ) )
{
ASC0_TBSRC.reg = configINTERRUPT_PRIORITY_TX | 0x5000UL;
xTransmitStatus = 0UL;
}
/* Install the Rx interrupt. */
if( 0 != _install_int_handler( configINTERRUPT_PRIORITY_RX, prvRxInterruptHandler, 0 ) )
{
ASC0_RSRC.reg = configINTERRUPT_PRIORITY_RX | 0x5000UL;
}
/* COM Handle is never used by demo code. */
return (xComPortHandle) pdPASS;
}
/*---------------------------------------------------------------------------*/
void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
{
unsigned short usChar;
for( usChar = 0; usChar < usStringLength; usChar++ )
{
xSerialPutChar( pxPort, pcString[ usChar ], portMAX_DELAY );
}
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
{
/* Just to remove compiler warnings about unused parameters. */
( void )pxPort;
return xQueueReceive( xSerialReceiveQueue, pcRxedChar, xBlockTime );
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
{
portBASE_TYPE xReturn = pdPASS;
/* Just to remove compiler warnings about unused parameters. */
( void )pxPort;
/* Send the character to the interrupt handler. */
xReturn = xQueueSend( xSerialTransmitQueue, &cOutChar, xBlockTime );
/* Start the transmission of bytes if necessary. */
prvCheckTransmit();
return xReturn;
}
/*---------------------------------------------------------------------------*/
static void prvTxBufferInterruptHandler( int iArg )
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
unsigned char ucTx;
/* Just to remove compiler warnings about unused parameters. */
( void ) iArg;
/* ACK. */
ASC0_TBSRC.reg |= 0x4000UL;
xTransmitStatus = 1UL;
/* TBUF Can be refilled. */
if( pdPASS == xQueueReceiveFromISR( xSerialTransmitQueue, &ucTx, &xHigherPriorityTaskWoken ) )
{
ASC0_TBUF.reg = ucTx;
}
else
{
/* Failed to get a character out of the Queue. No longer busy. */
xTransmitStatus = 0UL;
}
/* Finally end ISR and switch Task if necessary. */
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
static void prvRxInterruptHandler( int iArg )
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
unsigned char ucRx;
/* Just to remove compiler warnings about unused parameters. */
( void ) iArg;
/* Grab the character as early as possible. */
ucRx = ( unsigned char ) ASC0_RBUF.reg;
/* ACK. */
ASC0_RSRC.reg |= 0x4000UL;
/* Frame available in RBUF. */
if( pdPASS != xQueueSendFromISR( xSerialReceiveQueue, &ucRx, &xHigherPriorityTaskWoken ) )
{
/* Error handling code can go here. */
}
/* Finally end ISR and switch Task if necessary. */
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
void prvCheckTransmit( void )
{
/* Check to see if the interrupt handler is working its way through the
buffer. */
if( 0 == xTransmitStatus )
{
/* Not currently operational so kick off the first byte. */
ASC0_TBSRC.reg |= 0x8000UL;
}
}
/*---------------------------------------------------------------------------*/
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