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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [lwIP_MCF5235_GCC/] [system/] [serial.c] - Rev 596
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/* FreeRTOS MCF5235 port - Copyright (C) 2006 Christian Walter. 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** as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. 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 along with FreeRTOS; 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, 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. */ /* ------------------------ MCF523x includes ------------------------------ */ #include "mcf5xxx.h" #include "mcf523x.h" /* ------------------------ FreeRTOS includes ----------------------------- */ #include "FreeRTOS.h" #include "queue.h" #include "task.h" #include "serial.h" /* ----------------------- Defines ----------------------------------------- */ #define BAUDRATE_VALUE(fsys, baud) ( ( fsys )/(32UL * baud) ) #define MCF_UART_VECTOR ( 64 + 13 ) #define COM_NIFACE 1 #define COM_BLOCK_RETRYTIME 10 /* ------------------------ Static functions ------------------------------ */ static void prvSerialISR( void ); /* ------------------------ Static variables ------------------------------ */ typedef struct { portBASE_TYPE xInitialized; xQueueHandle xRXChars; xQueueHandle xTXChars; } xComPortIF_t; static xComPortIF_t xComPortIF[ COM_NIFACE ]; /* ------------------------ Begin implementation -------------------------- */ xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) { extern void ( *__RAMVEC[] ) ( ); xComPortHandle xReturn; portBASE_TYPE xOldIPL; /* Create the queues used to hold Rx and Tx characters. */ xComPortIF[ 0 ].xRXChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE )sizeof( signed char ) ); xComPortIF[ 0 ].xTXChars = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE )sizeof( signed char ) ); /* If the queues were created correctly then setup the serial port hardware. */ if( ( xComPortIF[ 0 ].xRXChars != 0 ) && ( xComPortIF[ 0 ].xTXChars != 0 ) ) { xOldIPL = portSET_IPL( portIPL_MAX ); /* UART 0: Reset transmitter, receiver and mode register pointer */ MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x3 ); MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x2 ); MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x1 ); /* Enable receive interrupts. */ MCF_UART_UIMR0 = MCF_UART_UIMR_RXRDY_FU; /* 8 Databits, 1 Stopbit and no parity */ MCF_UART_UMR0 = MCF_UART_UMR_PM( 0x3 ) | MCF_UART_UMR_SB( 0x7 ) | MCF_UART_UMR_BC( 0x3 ); /* UART 0 Clocking */ MCF_UART_UCSR0 = MCF_UART_UCSR_RCS( 0xd ) | MCF_UART_UCSR_TCS( 0xd ); MCF_UART_UBG10 = BAUDRATE_VALUE( FSYS_2, ulWantedBaud ) >> 8U; MCF_UART_UBG20 = BAUDRATE_VALUE( FSYS_2, ulWantedBaud ) & 0xFFU; /* UART 0: Enable interrupts */ __RAMVEC[MCF_UART_VECTOR] = prvSerialISR; MCF_INTC0_ICR13 = MCF_INTC0_ICRn_IL( 0x2 ) | MCF_INTC0_ICRn_IP( 0x1 ); MCF_INTC0_IMRL &= ~MCF_INTC0_IMRL_INT_MASK13; /* UART 0 Miscellaneous */ MCF_UART_UACR0 = 0; /* UART 0: Enable pins */ MCF_GPIO_PAR_UART = MCF_GPIO_PAR_UART_PAR_U0RXD | MCF_GPIO_PAR_UART_PAR_U0TXD; /* Enable the UART. */ MCF_UART_UCR0 = MCF_UART_UCR_RXC( 0x1 ) | MCF_UART_UCR_TXC( 0x1 ); xComPortIF[ 0 ].xInitialized = TRUE; xReturn = ( xComPortHandle ) &xComPortIF[ 0 ]; ( void )portSET_IPL( xOldIPL ); } else { xReturn = ( xComPortHandle ) 0; } return xReturn; } signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char * pcRxedChar, portTickType xBlockTime ) { int i; portBASE_TYPE xResult = pdFALSE; /* Lookup the correct interface. */ for( i = 0; i < COM_NIFACE; i++ ) { if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] ) { break; } } /* This COM port is available. */ if( ( i != COM_NIFACE ) && xComPortIF[ i ].xInitialized ) { /* Get the next character from the buffer. Return false if no characters * are available, or arrive before xBlockTime expires. */ if( xQueueReceive( xComPortIF[ i ].xRXChars, pcRxedChar, xBlockTime ) ) { xResult = pdTRUE; } } return xResult; } void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength ) { int i; signed char *pChNext; /* Send each character in the string, one at a time. */ pChNext = ( signed char * )pcString; for( i = 0; i < usStringLength; i++ ) { /* Block until character has been transmitted. */ while( xSerialPutChar( pxPort, *pChNext, COM_BLOCK_RETRYTIME ) != pdTRUE ); pChNext++; } } signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime ) { int i; portBASE_TYPE xResult = pdFALSE; portBASE_TYPE xOldIPL; /* Lookup the correct interface. */ for( i = 0; i < COM_NIFACE; i++ ) { if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] ) { break; } } /* This COM port is available. */ if( ( i != COM_NIFACE ) && xComPortIF[ i ].xInitialized ) { /* Place the character in the queue of characters to be transmitted. */ if( xQueueSend( xComPortIF[ i ].xTXChars, &cOutChar, xBlockTime ) == pdPASS ) { /* Turn on the Tx interrupt so the ISR will remove the character from the * queue and send it. */ MCF_UART_UIMR0 = MCF_UART_UIMR_TXRDY | MCF_UART_UIMR_RXRDY_FU; xResult = pdTRUE; } } return xResult; } signed portBASE_TYPE xSerialPutCharNOISR( xComPortHandle pxPort, signed char cOutChar ) { int i; portBASE_TYPE xResult = pdFALSE; portBASE_TYPE xOldIPL = portSET_IPL( portIPL_MAX ); /* Lookup the correct interface. */ for( i = 0; i < COM_NIFACE; i++ ) { if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] ) { break; } } /* This COM port is available. Support for this only available for COM1 right now. */ if( ( i != COM_NIFACE ) && ( i == 0 ) ) { /* Wait until the transmit buffer is ready. */ while( !( MCF_UART_USR0 & MCF_UART_USR_TXRDY ) ); /* Place the character in the transmit buffer. */ MCF_UART_UTB0 = cOutChar; xResult = pdTRUE; } ( void )portSET_IPL( xOldIPL ); return xResult; } void vSerialPutStringNOISR( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength ) { int i; signed char *pChNext; portBASE_TYPE xOldIPL = portSET_IPL( portIPL_MAX ); /* Send each character in the string, one at a time. */ pChNext = ( signed char * )pcString; for( i = 0; i < usStringLength; i++ ) { /* Block until character has been transmitted. */ while( xSerialPutCharNOISR( pxPort, *pChNext ) != pdTRUE ); pChNext++; } ( void )portSET_IPL( xOldIPL ); } void vSerialClose( xComPortHandle xPort ) { /* Not supported as not required by the demo application. */ } void prvSerialISR( void ) { static signed char cChar; static portBASE_TYPE xHigherPriorityTaskWoken; /* We have to remvoe the effect of the GCC. Please note that the * __attribute__ ((interrupt_handler)) does not work here because we * have to do the storing of the registers ourself. Another problem * is the usage of a frame pointer which is unlinked on entry. */ #if _GCC_USES_FP == 1 asm volatile ( "unlk %fp\n\t" ); #endif /* This ISR can cause a context switch, so the first statement must be * a call to the portENTER_SWITCHING_ISR() macro. This must be BEFORE any * variable declarations. */ portENTER_SWITCHING_ISR(); xHigherPriorityTaskWoken = pdFALSE; /* Ready to send a character from the buffer. */ if( MCF_UART_USR0 & MCF_UART_USR_TXRDY ) { /* Transmit buffer is ready. Test if there are characters available. */ if( xQueueReceiveFromISR( xComPortIF[ 0 ].xTXChars, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE ) { /* A character was retrieved from the queue so can be sent. */ MCF_UART_UTB0 = cChar; } else { /* Leave only receiver enabled. */ MCF_UART_UIMR0 = MCF_UART_UIMR_RXRDY_FU; } } if( MCF_UART_USR0 & MCF_UART_USR_RXRDY ) { cChar = MCF_UART_URB0; xQueueSendFromISR( xComPortIF[ 0].xRXChars, &cChar, &xHigherPriorityTaskWoken ); } /* Exit the ISR. If a task was woken by either a character being * or transmitted then a context switch will occur. */ portEXIT_SWITCHING_ISR( xHigherPriorityTaskWoken ); }
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