From 2a1782b01dec899b0182f41cbd66914283a890ec Mon Sep 17 00:00:00 2001 From: richardbarry Date: Fri, 24 Oct 2008 09:52:56 +0000 Subject: [PATCH] Add missing file. git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@521 1d2547de-c912-0410-9cb9-b8ca96c0e9e2 --- .../sources/serial/serial.c | 224 ++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100644 Demo/ColdFire_MCF52221_CodeWarrior/sources/serial/serial.c diff --git a/Demo/ColdFire_MCF52221_CodeWarrior/sources/serial/serial.c b/Demo/ColdFire_MCF52221_CodeWarrior/sources/serial/serial.c new file mode 100644 index 000000000..c553bd49f --- /dev/null +++ b/Demo/ColdFire_MCF52221_CodeWarrior/sources/serial/serial.c @@ -0,0 +1,224 @@ +/* + FreeRTOS.org V5.0.4 - Copyright (C) 2003-2008 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. + + *************************************************************************** + *************************************************************************** + * * + * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, * + * and even write all or part of your application on your behalf. * + * See http://www.OpenRTOS.com for details of the services we provide to * + * expedite your project. * + * * + *************************************************************************** + *************************************************************************** + + 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. + +NOTE: This driver is primarily to test the scheduler functionality. It does +not effectively use the buffers or DMA and is therefore not intended to be +an example of an efficient driver. */ + +/* Standard include file. */ +#include + +/* Scheduler include files. */ +#include "FreeRTOS.h" +#include "queue.h" +#include "task.h" + +/* Demo app include files. */ +#include "serial.h" + +/* Hardware definitions. */ +#define serNO_PARITY ( ( unsigned portCHAR ) 0x02 << 3 ) +#define ser8DATA_BITS ( ( unsigned portCHAR ) 0x03 ) +#define ser1STOP_BIT ( ( unsigned portCHAR ) 0x07 ) +#define serSYSTEM_CLOCK ( ( unsigned portCHAR ) 0xdd ) +#define serTX_ENABLE ( ( unsigned portCHAR ) 0x04 ) +#define serRX_ENABLE ( ( unsigned portCHAR ) 0x01 ) +#define serTX_INT ( ( unsigned portCHAR ) 0x01 ) +#define serRX_INT ( ( unsigned portCHAR ) 0x02 ) + + +/* The queues used to communicate between tasks and ISR's. */ +static xQueueHandle xRxedChars; +static xQueueHandle xCharsForTx; + +/* Flag used to indicate the tx status. */ +static portBASE_TYPE xTxHasEnded = pdTRUE; + +/*-----------------------------------------------------------*/ + +xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) +{ +const unsigned portLONG ulBaudRateDivisor = ( configCPU_CLOCK_HZ / ( 32UL * ulWantedBaud ) ); + + /* Create the queues used by the com test task. */ + xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) ); + xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) ); + + xTxHasEnded = pdTRUE; + + /* Set the pins to UART mode. */ + MCF_GPIO_PUAPAR |= MCF_GPIO_PUAPAR_UTXD0_UTXD0; + MCF_GPIO_PUAPAR |= MCF_GPIO_PUAPAR_URXD0_URXD0; + + /* Reset the peripheral. */ + MCF_UART0_UCR = MCF_UART_UCR_RESET_RX; + MCF_UART0_UCR = MCF_UART_UCR_RESET_TX; + MCF_UART0_UCR = MCF_UART_UCR_RESET_ERROR; + MCF_UART0_UCR = MCF_UART_UCR_RESET_BKCHGINT; + MCF_UART0_UCR = MCF_UART_UCR_RESET_MR | MCF_UART_UCR_RX_DISABLED | MCF_UART_UCR_TX_DISABLED; + + /* Configure the UART. */ + MCF_UART0_UMR1 = serNO_PARITY | ser8DATA_BITS; + MCF_UART0_UMR2 = ser1STOP_BIT; + MCF_UART0_UCSR = serSYSTEM_CLOCK; + + MCF_UART0_UBG1 = ( unsigned portCHAR ) ( ( ulBaudRateDivisor >> 8UL ) & 0xffUL ); + MCF_UART0_UBG2 = ( unsigned portCHAR ) ( ulBaudRateDivisor & 0xffUL ); + + /* Turn it on. */ + MCF_UART0_UCR = serTX_ENABLE | serRX_ENABLE; + + /* Configure the interrupt controller. Run the UARTs above the kernel + interrupt priority for demo purposes. */ + MCF_INTC0_ICR13 = ( ( configMAX_SYSCALL_INTERRUPT_PRIORITY - 1 ) << 3 ); + MCF_INTC0_IMRL &= ~( MCF_INTC_IMRL_INT_MASK13 | 0x01 ); + + /* The Tx interrupt is not enabled until there is data to send. */ + MCF_UART0_UIMR = serRX_INT; + + /* Only a single port is implemented so we don't need to return anything. */ + return NULL; +} +/*-----------------------------------------------------------*/ + +signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime ) +{ + /* Only one port is supported. */ + ( 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; + } +} +/*-----------------------------------------------------------*/ + +signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime ) +{ + /* Only one port is supported. */ + ( void ) pxPort; + + /* Return false if after the block time there is no room on the Tx queue. */ + if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) + { + return pdFAIL; + } + + /* A critical section should not be required as xTxHasEnded will not be + written to by the ISR if it is already 0 (is this correct?). */ + if( xTxHasEnded != pdFALSE ) + { + xTxHasEnded = pdFALSE; + MCF_UART0_UIMR = serRX_INT | serTX_INT; + } + + return pdPASS; +} +/*-----------------------------------------------------------*/ + +void vSerialClose( xComPortHandle xPort ) +{ + ( void ) xPort; +} +/*-----------------------------------------------------------*/ + +__declspec(interrupt:0) void vUART0InterruptHandler( void ) +{ +unsigned portCHAR ucChar; +portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE, xDoneSomething = pdTRUE; + + while( xDoneSomething != pdFALSE ) + { + xDoneSomething = pdFALSE; + + /* Does the tx buffer contain space? */ + if( ( MCF_UART0_USR & MCF_UART_USR_TXRDY ) != 0x00 ) + { + /* Are there any characters queued to be sent? */ + if( xQueueReceiveFromISR( xCharsForTx, &ucChar, &xHigherPriorityTaskWoken ) == pdTRUE ) + { + /* Send the next char. */ + MCF_UART0_UTB = ucChar; + xDoneSomething = pdTRUE; + } + else + { + /* Turn off the Tx interrupt until such time as another character + is being transmitted. */ + MCF_UART0_UIMR = serRX_INT; + xTxHasEnded = pdTRUE; + } + } + + if( MCF_UART0_USR & MCF_UART_USR_RXRDY ) + { + ucChar = MCF_UART0_URB; + xQueueSendFromISR( xRxedChars, &ucChar, &xHigherPriorityTaskWoken ); + xDoneSomething = pdTRUE; + } + } + + portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); +} + + + + + + + -- 2.39.2