| /* | |
| FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd. | |
| All rights reserved | |
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| *************************************************************************** | |
| * * | |
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| *************************************************************************** | |
| 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. | |
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| >>! outside of the FreeRTOS kernel. !<< | |
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| FOR A PARTICULAR PURPOSE. Full license text is available from the following | |
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| *************************************************************************** | |
| * * | |
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| 1 tab == 4 spaces! | |
| */ | |
| /* | |
| BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0. | |
| *NOTE* - This file is designed to test some of the RTOS features - it is | |
| not intended to represent an efficient implementation! | |
| */ | |
| /* Standard includes. */ | |
| #include <stdlib.h> | |
| /* Scheduler includes. */ | |
| #include "FreeRTOS.h" | |
| #include "queue.h" | |
| /* Demo application includes. */ | |
| #include "serial.h" | |
| /* Hardware specifics. */ | |
| #define serRX_DATA_PIN ( 0x01 ) | |
| #define serTX_DATA_PIN ( 0x02 ) | |
| #define serCLOCK_Fxx_DIV_8 0x03 | |
| #define serUPWR ( 0x80 ) | |
| #define serUTXE ( 0x40 ) | |
| #define serURXE ( 0x20 ) | |
| #define serUCL ( 0x02 ) | |
| #define serLSB ( 0x10 ) | |
| /* Misc. */ | |
| #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 ) | |
| #define serHANDLE ( ( xComPortHandle ) 1 ) | |
| #define serNO_BLOCK ( ( TickType_t ) 0 ) | |
| /*-----------------------------------------------------------*/ | |
| /* Queues used to hold received characters, and characters waiting to be | |
| transmitted. */ | |
| static QueueHandle_t xRxedChars; | |
| static QueueHandle_t xCharsForTx; | |
| /*-----------------------------------------------------------*/ | |
| /* Interrupt entry point written in the assembler file serialISR.s85. */ | |
| extern void vSerialISREntry( void ); | |
| /* Flag to indicate whether or not there are characters already queued to send. */ | |
| static volatile unsigned long ulTxInProgress = pdFALSE; | |
| /*-----------------------------------------------------------*/ | |
| /* | |
| * See the serial2.h header file. | |
| */ | |
| xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
| { | |
| xComPortHandle xReturn = serHANDLE; | |
| const unsigned long ulFuclk = ( configCPU_CLOCK_HZ / 2 ) / 8UL; | |
| /* 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(); | |
| { | |
| /* Set the UART0 Rx and Tx pins to their alternative function. */ | |
| PMC3 |= ( serRX_DATA_PIN | serTX_DATA_PIN ); | |
| PM3 &= ~( serTX_DATA_PIN ); | |
| /* Setup clock for required baud. */ | |
| UD0CTL1 = serCLOCK_Fxx_DIV_8; | |
| UD0CTL2 = ulFuclk / ( 2 * ulWantedBaud ); | |
| /* Enable, n81. */ | |
| UD0CTL0 = ( serUPWR | serUTXE | serURXE | serUCL | serLSB ); | |
| /* Enable interrupts for both Rx and Tx. */ | |
| UD0TIC = 0x07; | |
| UD0RIC = 0x07; | |
| ulTxInProgress = pdFALSE; | |
| } | |
| 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, TickType_t 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, TickType_t xBlockTime ) | |
| { | |
| portBASE_TYPE xReturn = pdPASS; | |
| portENTER_CRITICAL(); | |
| { | |
| /* There are currently no characters queued up to send so write the | |
| character directly to the UART. */ | |
| if( ulTxInProgress == pdFALSE ) | |
| { | |
| UD0TX = cOutChar; | |
| ulTxInProgress = pdTRUE; | |
| } | |
| else | |
| { | |
| /* The UART is already busy so write the character to the Tx queue. | |
| The queue is drained from within the Tx interrupt. */ | |
| if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) | |
| { | |
| xReturn = pdFAIL; | |
| } | |
| } | |
| } | |
| portEXIT_CRITICAL(); | |
| return xReturn; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void vSerialClose( xComPortHandle xPort ) | |
| { | |
| /* Not supported as not required by the demo application. */ | |
| } | |
| /*-----------------------------------------------------------*/ | |
| /* Tx interrupt handler. This is called from the asm file wrapper. */ | |
| void vUARTTxISRHandler( void ) | |
| { | |
| char cChar; | |
| portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
| /* Are there any more characters queue to transmit? */ | |
| if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE ) | |
| { | |
| /* Send the next character. */ | |
| UD0TX = cChar; | |
| } | |
| else | |
| { | |
| /* The UART is no longer active. */ | |
| ulTxInProgress = pdFALSE; | |
| } | |
| /* If reading a character from the Rx queue caused a task to unblock, and | |
| the unblocked task has a priority higher than the currently running task, | |
| then xHigherPriorityTaskWoken will have been set to true and a context | |
| switch should occur now. */ | |
| portYIELD_FROM_ISR( xHigherPriorityTaskWoken ); | |
| } | |
| /*-----------------------------------------------------------*/ | |
| /* Rx interrupt handler. This is called from the asm file wrapper. */ | |
| void vUARTRxISRHandler( void ) | |
| { | |
| char cChar; | |
| portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
| /* Send the received character to the Rx queue. */ | |
| cChar = UD0RX; | |
| xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ); | |
| /* If sending a character to the Tx queue caused a task to unblock, and | |
| the unblocked task has a priority higher than the currently running task, | |
| then xHigherPriorityTaskWoken will have been set to true and a context | |
| switch should occur now. */ | |
| portYIELD_FROM_ISR( xHigherPriorityTaskWoken ); | |
| } | |