/* FreeRTOS V7.5.1 - Copyright (C) 2013 Real Time Engineers Ltd. VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. *************************************************************************** * * * FreeRTOS provides completely free yet professionally developed, * * robust, strictly quality controlled, supported, and cross * * platform software that has become a de facto standard. * * * * Help yourself get started quickly and support the FreeRTOS * * project by purchasing a FreeRTOS tutorial book, reference * * manual, or both from: http://www.FreeRTOS.org/Documentation * * * * Thank you! * * * *************************************************************************** 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 modification 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. Full license text is available from the following link: http://www.freertos.org/a00114.html 1 tab == 4 spaces! *************************************************************************** * * * Having a problem? Start by reading the FAQ "My application does * * not run, what could be wrong?" * * * * http://www.FreeRTOS.org/FAQHelp.html * * * *************************************************************************** http://www.FreeRTOS.org - Documentation, books, training, latest versions, license and Real Time Engineers Ltd. contact details. http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, including FreeRTOS+Trace - an indispensable productivity tool, a DOS compatible FAT file system, and our tiny thread aware UDP/IP stack. http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS licenses offer ticketed support, indemnification and middleware. http://www.SafeRTOS.com - High Integrity Systems also provide a safety engineered and independently SIL3 certified version for use in safety and mission critical applications that require provable dependability. 1 tab == 4 spaces! */ /* 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 ); }