| /* | |
| FreeRTOS V7.5.3 - Copyright (C) 2013 Real Time Engineers Ltd. | |
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| This file is part of the FreeRTOS distribution. | |
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| the terms of the GNU General Public License (version 2) as published by the | |
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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 ); | |
| } | |
| /*---------------------------------------------------------------------------*/ |