/* | |
FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd. | |
*************************************************************************** | |
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*************************************************************************** | |
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. | |
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
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License and the FreeRTOS license exception along with FreeRTOS; if not it | |
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*/ | |
/* 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 ( ( xQueueHandle ) 0 ) | |
#define serNO_BLOCK ( ( portTickType ) 0 ) | |
/*---------------------------------------------------------------------------*/ | |
static xQueueHandle xRxedChars; | |
static xQueueHandle 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, portTickType 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, portTickType 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 ); | |
} | |
/*---------------------------------------------------------------------------*/ |