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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_STR75x_IAR/] [serial/] [serial.c] - Rev 594
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/* FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd. *************************************************************************** * * * If you are: * * * * + New to FreeRTOS, * * + Wanting to learn FreeRTOS or multitasking in general quickly * * + Looking for basic training, * * + Wanting to improve your FreeRTOS skills and productivity * * * * then take a look at the FreeRTOS books - available as PDF or paperback * * * * "Using the FreeRTOS Real Time Kernel - a Practical Guide" * * http://www.FreeRTOS.org/Documentation * * * * A pdf reference manual is also available. Both are usually delivered * * to your inbox within 20 minutes to two hours when purchased between 8am * * and 8pm GMT (although please allow up to 24 hours in case of * * exceptional circumstances). Thank you for your support! * * * *************************************************************************** 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. FreeRTOS 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 and the FreeRTOS license exception along with FreeRTOS; if not it can be viewed here: http://www.freertos.org/a00114.html and also obtained by writing to Richard Barry, contact details for whom are available on the FreeRTOS WEB site. 1 tab == 4 spaces! 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. */ /* Library includes. */ #include "75x_uart.h" #include "75x_gpio.h" #include "75x_eic.h" #include "75x_mrcc.h" /* Scheduler includes. */ #include "FreeRTOS.h" #include "queue.h" /* Demo application includes. */ #include "serial.h" #define serINVALID_QUEUE ( ( xQueueHandle ) 0 ) #define serNO_BLOCK ( ( portTickType ) 0 ) /*-----------------------------------------------------------*/ /* Queues used to hold received characters, and characters waiting to be transmitted. */ static xQueueHandle xRxedChars; static xQueueHandle xCharsForTx; static volatile portBASE_TYPE xQueueEmpty = pdTRUE; /*-----------------------------------------------------------*/ /* The interrupt service routine - called from the assembly entry point. */ __arm void vSerialISR( void ); /*-----------------------------------------------------------*/ /* * See the serial2.h header file. */ xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) { xComPortHandle xReturn; UART_InitTypeDef UART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; EIC_IRQInitTypeDef EIC_IRQInitStructure; /* 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(); { /* Enable the UART0 Clock. */ MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE ); /* Configure the UART0_Tx as alternate function */ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_Init(GPIO0, &GPIO_InitStructure); /* Configure the UART0_Rx as input floating */ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_Init(GPIO0, &GPIO_InitStructure); /* Configure UART0. */ UART_InitStructure.UART_WordLength = UART_WordLength_8D; UART_InitStructure.UART_StopBits = UART_StopBits_1; UART_InitStructure.UART_Parity = UART_Parity_No; UART_InitStructure.UART_BaudRate = ulWantedBaud; UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None; UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx; UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */ UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */ UART_Init(UART0, &UART_InitStructure); /* Enable the UART0 */ UART_Cmd(UART0, ENABLE); /* Configure the IEC for the UART interrupts. */ EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE; EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel; EIC_IRQInitStructure.EIC_IRQChannelPriority = 1; EIC_IRQInit(&EIC_IRQInitStructure); xQueueEmpty = pdTRUE; UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE ); } 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 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 { return pdFALSE; } } /*-----------------------------------------------------------*/ 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++; } } /*-----------------------------------------------------------*/ signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime ) { portBASE_TYPE xReturn; /* Place the character in the queue of characters to be transmitted. */ portENTER_CRITICAL(); { if( xQueueEmpty == pdTRUE ) { UART0->DR = cOutChar; xReturn = pdPASS; } else { if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) { xReturn = pdFAIL; } else { xReturn = pdPASS; } } xQueueEmpty = pdFALSE; } portEXIT_CRITICAL(); return xReturn; } /*-----------------------------------------------------------*/ void vSerialClose( xComPortHandle xPort ) { /* Not supported as not required by the demo application. */ } /*-----------------------------------------------------------*/ __arm void vSerialISR( void ) { signed char cChar; portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; do { if( UART0->MIS & UART_IT_Transmit ) { /* 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. */ UART0->DR = cChar; } else { xQueueEmpty = pdTRUE; } UART_ClearITPendingBit( UART0, UART_IT_Transmit ); } if( UART0->MIS & UART_IT_Receive ) { /* The interrupt was caused by a character being received. Grab the character from the RHR and place it in the queue of received characters. */ cChar = UART0->DR; xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ); UART_ClearITPendingBit( UART0, UART_IT_Receive ); } } while( UART0->MIS ); /* 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 ); }
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