From 5c2a7714b78d121630d33c25309adbe8e305ec0c Mon Sep 17 00:00:00 2001 From: RichardBarry Date: Mon, 9 Feb 2009 20:03:16 +0000 Subject: Add comtest tasks to the AT91SAM9XE demo. git-svn-id: https://freertos.svn.sourceforge.net/svnroot/freertos/trunk@694 1d2547de-c912-0410-9cb9-b8ca96c0e9e2 --- Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c | 267 +++++++++++++++++++++++++++++++ 1 file changed, 267 insertions(+) create mode 100644 Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c diff --git a/Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c b/Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c new file mode 100644 index 00000000..78607505 --- /dev/null +++ b/Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c @@ -0,0 +1,267 @@ +/* + FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry. + + This file is part of the FreeRTOS.org distribution. + + FreeRTOS.org is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + FreeRTOS.org 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. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with FreeRTOS.org; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + A special exception to the GPL can be applied should you wish to distribute + a combined work that includes FreeRTOS.org, without being obliged to provide + the source code for any proprietary components. See the licensing section + of http://www.FreeRTOS.org for full details of how and when the exception + can be applied. + + *************************************************************************** + *************************************************************************** + * * + * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation * + * * + * This is a concise, step by step, 'hands on' guide that describes both * + * general multitasking concepts and FreeRTOS specifics. It presents and * + * explains numerous examples that are written using the FreeRTOS API. * + * Full source code for all the examples is provided in an accompanying * + * .zip file. * + * * + *************************************************************************** + *************************************************************************** + + Please ensure to read the configuration and relevant port sections of the + online documentation. + + http://www.FreeRTOS.org - Documentation, latest information, license and + contact details. + + http://www.SafeRTOS.com - A version that is certified for use in safety + critical systems. + + http://www.OpenRTOS.com - Commercial support, development, porting, + licensing and training services. +*/ + +/* + BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0. +*/ + +/* Standard includes. */ +#include + +/* Scheduler includes. */ +#include "FreeRTOS.h" +#include "queue.h" + +/* Demo application includes. */ +#include "serial.h" + +/* Atmel library includes. */ +#include +#include +#include + +/*-----------------------------------------------------------*/ + +/* Location of the COM0 registers. */ +#define serCOM0 ( ( AT91PS_USART ) AT91C_BASE_US0 ) + +/* Interrupt control macros. */ +#define serINTERRUPT_LEVEL ( 5 ) +#define vInterruptOn() serCOM0->US_IER = ( AT91C_US_TXRDY | AT91C_US_RXRDY ) +#define vInterruptOff() serCOM0->US_IDR = AT91C_US_TXRDY + +/* Misc constants. */ +#define serINVALID_QUEUE ( ( xQueueHandle ) 0 ) +#define serHANDLE ( ( xComPortHandle ) 1 ) +#define serNO_BLOCK ( ( portTickType ) 0 ) +#define serNO_TIMEGUARD ( ( unsigned portLONG ) 0 ) +#define serNO_PERIPHERAL_B_SETUP ( ( unsigned portLONG ) 0 ) + + +/* Queues used to hold received characters, and characters waiting to be +transmitted. */ +static xQueueHandle xRxedChars; +static xQueueHandle xCharsForTx; + +/*-----------------------------------------------------------*/ + +/* The interrupt service routine. */ +__arm void vSerialISR( void ); + +/*-----------------------------------------------------------*/ + +/* + * See the serial2.h header file. + */ +xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) +{ +xComPortHandle xReturn = serHANDLE; + + /* Create the queues used to hold Rx and Tx characters. */ + xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) ); + xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) ); + + /* If the queues were created correctly then setup the serial port + hardware. */ + if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) ) + { + PMC_EnablePeripheral( AT91C_ID_US0 ); + portENTER_CRITICAL(); + { + USART_Configure( serCOM0, ( AT91C_US_CHRL_8_BITS | AT91C_US_PAR_NONE ), ulWantedBaud, configCPU_CLOCK_HZ ); + + /* Enable Rx and Tx. */ + USART_SetTransmitterEnabled( serCOM0, pdTRUE ); + USART_SetReceiverEnabled( serCOM0, pdTRUE ); + + /* Enable the Rx interrupts. The Tx interrupts are not enabled + until there are characters to be transmitted. */ + serCOM0->US_IER = AT91C_US_RXRDY; + + /* Enable the interrupts in the AIC. */ + AIC_ConfigureIT( AT91C_ID_US0, AT91C_AIC_PRIOR_LOWEST, ( void (*)( void ) ) vSerialISR ); + AIC_EnableIT( AT91C_ID_US0 ); + } + portEXIT_CRITICAL(); + } + else + { + xReturn = ( xComPortHandle ) 0; + } + + /* This demo file only supports a single port but we have to return + something to comply with the standard demo header file. */ + return xReturn; +} +/*-----------------------------------------------------------*/ + +signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *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 + { + return pdFALSE; + } +} +/*-----------------------------------------------------------*/ + +void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength ) +{ +signed portCHAR *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 portCHAR * ) pcString; + while( *pxNext ) + { + xSerialPutChar( pxPort, *pxNext, serNO_BLOCK ); + pxNext++; + } +} +/*-----------------------------------------------------------*/ + +signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime ) +{ + /* Just to remove compiler warning. */ + ( void ) pxPort; + + /* Place the character in the queue of characters to be transmitted. */ + if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) + { + return pdFAIL; + } + + /* Turn on the Tx interrupt so the ISR will remove the character from the + queue and send it. This does not need to be in a critical section as + if the interrupt has already removed the character the next interrupt + will simply turn off the Tx interrupt again. */ + vInterruptOn(); + + return pdPASS; +} +/*-----------------------------------------------------------*/ + +void vSerialClose( xComPortHandle xPort ) +{ + /* Not supported as not required by the demo application. */ + ( void ) xPort; +} +/*-----------------------------------------------------------*/ + +/* Serial port ISR. This can cause a context switch so is not defined as a +standard ISR using the __irq keyword. Instead a wrapper function is defined +within serialISR.s79 which in turn calls this function. See the port +documentation on the FreeRTOS.org website for more information. */ +__arm void vSerialISR( void ) +{ +unsigned portLONG ulStatus; +signed portCHAR cChar; +portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; + + /* What caused the interrupt? */ + ulStatus = serCOM0->US_CSR &= serCOM0->US_IMR; + + if( ulStatus & AT91C_US_TXRDY ) + { + /* The interrupt was caused by the THR becoming empty. Are there any + more characters to transmit? */ + if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE ) + { + /* A character was retrieved from the queue so can be sent to the + THR now. */ + serCOM0->US_THR = cChar; + } + else + { + /* Queue empty, nothing to send so turn off the Tx interrupt. */ + vInterruptOff(); + } + } + + if( ulStatus & AT91C_US_RXRDY ) + { + /* The interrupt was caused by a character being received. Grab the + character from the RHR and place it in the queue or received + characters. */ + cChar = serCOM0->US_RHR; + xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ); + } + + /* If a task was woken by either a character being received or a character + being transmitted then we may need to switch to another task. */ + portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); + + /* End the interrupt in the AIC. */ + AT91C_BASE_AIC->AIC_EOICR = 0; +} + + + + + -- cgit v1.2.3