/* FreeRTOS V8.1.1 - Copyright (C) 2014 Real Time Engineers Ltd. All rights reserved 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 USART0. This file contains all the serial port components that can be compiled to either ARM or THUMB mode. Components that must be compiled to ARM mode are contained in serialISR.c. */ /* Standard includes. */ #include /* Scheduler includes. */ #include "FreeRTOS.h" #include "queue.h" #include "task.h" /* Demo application includes. */ #include "serial.h" #include "AT91R40008.h" #include "usart.h" #include "pio.h" #include "aic.h" /*-----------------------------------------------------------*/ /* Constants to setup and access the UART. */ #define portUSART0_AIC_CHANNEL ( ( unsigned long ) 2 ) #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; /*-----------------------------------------------------------*/ /* * The queues are created in serialISR.c as they are used from the ISR. * Obtain references to the queues and THRE Empty flag. */ extern void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, QueueHandle_t *pxRxedChars, QueueHandle_t *pxCharsForTx ); /*-----------------------------------------------------------*/ xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) { unsigned long ulSpeed; unsigned long ulCD; xComPortHandle xReturn = serHANDLE; extern void ( vUART_ISR_Wrapper )( void ); /* The queues are used in the serial ISR routine, so are created from serialISR.c (which is always compiled to ARM mode. */ vSerialISRCreateQueues( uxQueueLength, &xRxedChars, &xCharsForTx ); if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) && ( ulWantedBaud != ( unsigned long ) 0 ) ) { portENTER_CRITICAL(); { /* Enable clock to USART0... */ AT91C_BASE_PS->PS_PCER = AT91C_PS_US0; /* Disable all USART0 interrupt sources to begin... */ AT91C_BASE_US0->US_IDR = 0xFFFFFFFF; /* Reset various status bits (just in case)... */ AT91C_BASE_US0->US_CR = US_RSTSTA; AT91C_BASE_PIO->PIO_PDR = TXD0 | RXD0; /* Enable RXD and TXD pins */ AT91C_BASE_US0->US_CR = US_RSTRX | US_RSTTX | US_RXDIS | US_TXDIS; /* Clear Transmit and Receive Counters */ AT91C_BASE_US0->US_RCR = 0; AT91C_BASE_US0->US_TCR = 0; /* Input clock to baud rate generator is MCK */ ulSpeed = configCPU_CLOCK_HZ * 10; ulSpeed = ulSpeed / 16; ulSpeed = ulSpeed / ulWantedBaud; /* compute the error */ ulCD = ulSpeed / 10; if ((ulSpeed - (ulCD * 10)) >= 5) ulCD++; /* Define the baud rate divisor register */ AT91C_BASE_US0->US_BRGR = ulCD; /* Define the USART mode */ AT91C_BASE_US0->US_MR = US_CLKS_MCK | US_CHRL_8 | US_PAR_NO | US_NBSTOP_1 | US_CHMODE_NORMAL; /* Write the Timeguard Register */ AT91C_BASE_US0->US_TTGR = 0; /* Setup the interrupt for USART0. Store interrupt handler function address in USART0 vector register... */ AT91C_BASE_AIC->AIC_SVR[ portUSART0_AIC_CHANNEL ] = (unsigned long)vUART_ISR_Wrapper; /* USART0 interrupt level-sensitive, priority 1... */ AT91C_BASE_AIC->AIC_SMR[ portUSART0_AIC_CHANNEL ] = AIC_SRCTYPE_INT_LEVEL_SENSITIVE | 1; /* Clear some pending USART0 interrupts (just in case)... */ AT91C_BASE_US0->US_CR = US_RSTSTA; /* Enable USART0 interrupt sources (but not Tx for now)... */ AT91C_BASE_US0->US_IER = US_RXRDY; /* Enable USART0 interrupts in the AIC... */ AT91C_BASE_AIC->AIC_IECR = ( 1 << portUSART0_AIC_CHANNEL ); /* Enable receiver and transmitter... */ AT91C_BASE_US0->US_CR = US_RXEN | US_TXEN; } portEXIT_CRITICAL(); } else { xReturn = ( xComPortHandle ) 0; } 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 UART0. */ ( 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; /* 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; ( void ) usStringLength; /* 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 ) { ( void ) pxPort; /* Place the character in the queue of characters to be transmitted. */ if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) { return pdFAIL; } /* Turn on the Tx interrupt so the ISR will remove the character from the queue and send it. This does not need to be in a critical section as if the interrupt has already removed the character the next interrupt will simply turn off the Tx interrupt again. */ AT91C_BASE_US0->US_IER = US_TXRDY; return pdPASS; } /*-----------------------------------------------------------*/ void vSerialClose( xComPortHandle xPort ) { /* Not supported as not required by the demo application. */ ( void ) xPort; } /*-----------------------------------------------------------*/