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/*
* FreeRTOS Kernel V10.4.0
* 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!
*/
/* NOTE: This is just a test file and not intended to be a generic
COM driver. */
#include "altera_avalon_uart.h"
#include "altera_avalon_uart_regs.h"
#include "sys/alt_irq.h"
#include "FreeRTOS.h"
#include "queue.h"
#include "system.h"
#include "Serial.h"
/*---------------------------------------------------------------------------*/
#define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
#define serNO_BLOCK ( ( TickType_t ) 0 )
/*---------------------------------------------------------------------------*/
static QueueHandle_t xRxedChars;
static QueueHandle_t xCharsForTx;
alt_u32 uartControl;
/*---------------------------------------------------------------------------*/
static void vUARTInterruptHandler( void* context, alt_u32 id );
static void vUARTReceiveHandler( alt_u32 status );
static void vUARTTransmitHandler( alt_u32 status );
/*---------------------------------------------------------------------------*/
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 the queues were created correctly then setup the serial port hardware. */
if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
{
portENTER_CRITICAL();
{
uartControl = ALTERA_AVALON_UART_CONTROL_RTS_MSK | ALTERA_AVALON_UART_CONTROL_RRDY_MSK | ALTERA_AVALON_UART_CONTROL_DCTS_MSK;
IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
/* register the interrupt handler */
alt_irq_register ( UART_IRQ, NULL, vUARTInterruptHandler );
}
portEXIT_CRITICAL();
}
else
{
return ( xComPortHandle ) 0;
}
return ( xComPortHandle ) 1;
}
/*---------------------------------------------------------------------------*/
void vSerialClose( xComPortHandle xPort )
{
/* Never used. */
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
{
/* The port handle is not required as this driver only supports one port. */
( 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
{
uartControl |= ALTERA_AVALON_UART_CONTROL_RRDY_MSK;
IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
return pdFALSE;
}
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
{
signed portBASE_TYPE lReturn = pdPASS;
/* Place the character in the queue of characters to be transmitted. */
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
{
/*Triggers an interrupt on every character or (down) when queue is full. */
uartControl |= ALTERA_AVALON_UART_CONTROL_TRDY_MSK;
IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
lReturn = pdPASS;
}
else
{
lReturn = pdFAIL;
}
return lReturn;
}
/*---------------------------------------------------------------------------*/
void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
{
signed char *pxNext;
/* A couple of parameters that this port does not use. */
( void ) usStringLength;
( void ) pxPort;
/* NOTE: This implementation does not handle the queue being full as no block time is used! */
/* The port handle is not required as this driver only supports UART0. */
( void ) pxPort;
/* Send each character in the string, one at a time. */
pxNext = ( signed char * ) pcString;
while( *pxNext )
{
xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
pxNext++;
}
}
/*-----------------------------------------------------------*/
static void vUARTInterruptHandler( void* context, alt_u32 id )
{
alt_u32 status;
/* Read the status register in order to determine the cause of the
interrupt. */
status = IORD_ALTERA_AVALON_UART_STATUS( UART_BASE );
/* Clear any error flags set at the device */
IOWR_ALTERA_AVALON_UART_STATUS( UART_BASE, 0 );
/* process a read irq */
if ( status & ALTERA_AVALON_UART_STATUS_RRDY_MSK )
{
vUARTReceiveHandler( status );
}
/* process a write irq */
if ( status & ( ALTERA_AVALON_UART_STATUS_TRDY_MSK ) )
{
vUARTTransmitHandler( status );
}
}
/*---------------------------------------------------------------------------*/
static void vUARTReceiveHandler( alt_u32 status )
{
signed char cChar;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
/* If there was an error, discard the data */
if ( status & ( ALTERA_AVALON_UART_STATUS_PE_MSK | ALTERA_AVALON_UART_STATUS_FE_MSK ) )
{
asm("break");
return;
}
/* Transfer data from the device to the circular buffer */
cChar = IORD_ALTERA_AVALON_UART_RXDATA( UART_BASE );
if ( pdTRUE != xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ) )
{
/* If the circular buffer was full, disable interrupts. Interrupts will
be re-enabled when data is removed from the buffer. */
uartControl &= ~ALTERA_AVALON_UART_CONTROL_RRDY_MSK;
IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
}
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
static void vUARTTransmitHandler( alt_u32 status )
{
signed char cChar;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
/* Transfer data if there is some ready to be transferred */
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
{
IOWR_ALTERA_AVALON_UART_TXDATA( UART_BASE, cChar );
}
else
{
uartControl &= ~ALTERA_AVALON_UART_CONTROL_TRDY_MSK;
}
IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
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