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| */ | |
| /* | |
| BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART2. | |
| ***Note*** This example uses queues to send each character into an interrupt | |
| service routine and out of an interrupt service routine individually. This | |
| is done to demonstrate queues being used in an interrupt, and to deliberately | |
| load the system to test the FreeRTOS port. It is *NOT* meant to be an | |
| example of an efficient implementation. An efficient implementation should | |
| use the DMA, and only use FreeRTOS API functions when enough has been | |
| received to warrant a task being unblocked to process the data. | |
| */ | |
| /* Scheduler includes. */ | |
| #include "FreeRTOS.h" | |
| #include "queue.h" | |
| #include "semphr.h" | |
| #include "comtest2.h" | |
| /* Driver includes. */ | |
| #include "r_typedefs.h" | |
| #include "dev_drv.h" | |
| #include "devdrv_scif_uart.h" | |
| #include "sio_char.h" | |
| #include "iodefine.h" | |
| #include "devdrv_intc.h" | |
| /* Demo application includes. */ | |
| #include "serial.h" | |
| /*-----------------------------------------------------------*/ | |
| /* Misc defines. */ | |
| #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 ) | |
| #define serNO_BLOCK ( ( TickType_t ) 0 ) | |
| /*-----------------------------------------------------------*/ | |
| /* Handlers for the Rx and Tx interrupts respectively. */ | |
| static void prvRXI_Handler( uint32_t ulUnusedParameter ); | |
| static void prvTXI_Handler( uint32_t ulUnusedParameter ); | |
| /*-----------------------------------------------------------*/ | |
| /* The queue used to hold received characters. */ | |
| static QueueHandle_t xRxedChars; | |
| static QueueHandle_t xCharsForTx; | |
| /*-----------------------------------------------------------*/ | |
| /* | |
| * See the serial2.h header file. | |
| */ | |
| xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
| { | |
| /* Baud is set in IoInitScif2(), called in prvSetupHardware() in main.c. */ | |
| ( void ) ulWantedBaud; | |
| /* Create the queues used to hold Rx/Tx characters. Note the comments at | |
| the top of this file regarding the use of queues in this manner. */ | |
| xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) ); | |
| xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( char ) ); | |
| /* If the queues were created correctly then setup the serial port | |
| hardware. */ | |
| if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) ) | |
| { | |
| /* Register RXI and TXI handlers. */ | |
| R_INTC_RegistIntFunc( INTC_ID_RXI2, prvRXI_Handler ); | |
| R_INTC_RegistIntFunc( INTC_ID_TXI2, prvTXI_Handler ); | |
| /* Set both interrupts such that they can interrupt the tick. Also | |
| set the Rx interrupt above the Tx interrupt in the hope that (for test | |
| purposes) the Tx interrupt will interrupt the Rx interrupt. */ | |
| R_INTC_SetPriority( INTC_ID_RXI2, configMAX_API_CALL_INTERRUPT_PRIORITY ); | |
| R_INTC_SetPriority( INTC_ID_TXI2, ( configMAX_API_CALL_INTERRUPT_PRIORITY + 1 ) ); | |
| /* This driver is intended to test interrupt interactions, and not | |
| intended to be efficient. Therefore set the RX trigger level to 1. */ | |
| SCIF2.SCFCR.BIT.RTRG = 0; | |
| SCIF2.SCFCR.BIT.TTRG = 3; | |
| /* Enable Rx interrupt. Tx interrupt will be enabled when a Tx is | |
| performed. */ | |
| SCIF2.SCSCR.BIT.RIE = 1; | |
| R_INTC_Enable( INTC_ID_RXI2 ); | |
| R_INTC_Enable( INTC_ID_TXI2 ); | |
| } | |
| /* This demo file only supports a single port but we have to return | |
| something to comply with the standard demo header file. */ | |
| return ( xComPortHandle ) 0; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| 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 ) | |
| { | |
| char *pxNext; | |
| /* A couple of parameters that this port does not use. */ | |
| ( void ) usStringLength; | |
| ( void ) pxPort; | |
| /* Send each character in the string, one at a time. */ | |
| pxNext = ( char * ) pcString; | |
| while( *pxNext ) | |
| { | |
| xSerialPutChar( pxPort, *pxNext, portMAX_DELAY ); | |
| pxNext++; | |
| } | |
| } | |
| /*-----------------------------------------------------------*/ | |
| signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime ) | |
| { | |
| signed portBASE_TYPE xReturn; | |
| /* Note the comments at the top of this file regarding the use of queues in | |
| this manner. */ | |
| if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS ) | |
| { | |
| xReturn = pdPASS; | |
| /* Enable the interrupt which will remove the character from the | |
| queue. */ | |
| SCIF2.SCSCR.BIT.TIE = 1; | |
| } | |
| else | |
| { | |
| xReturn = pdFAIL; | |
| } | |
| return xReturn; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void vSerialClose( xComPortHandle xPort ) | |
| { | |
| /* Not supported as not required by the demo application. */ | |
| } | |
| /*-----------------------------------------------------------*/ | |
| static void prvRXI_Handler( uint32_t ulUnusedParameter ) | |
| { | |
| unsigned char ucRxedByte; | |
| long lHigherPriorityTaskWoken = pdFALSE; | |
| /* The parameter is not used. It is only present because Renesas drivers | |
| are used to install the interrupt handlers, and the drivers expect the | |
| parameter to be present. */ | |
| ( void ) ulUnusedParameter; | |
| /* Note the comments at the top of this file regarding the use of queues in | |
| this manner. */ | |
| while( ( SCIF2.SCFDR.WORD & 0x1F ) != 0 ) | |
| { | |
| ucRxedByte = SCIF2.SCFRDR.BYTE; | |
| xQueueSendFromISR( xRxedChars, &ucRxedByte, &lHigherPriorityTaskWoken ); | |
| } | |
| SCIF2.SCFSR.BIT.RDF = 0; | |
| /* If sending to the queue has caused a task to unblock, and the unblocked | |
| task has a priority equal to or higher than the currently running task (the | |
| task this ISR interrupted), then lHigherPriorityTaskWoken will have | |
| automatically been set to pdTRUE within the queue send function. | |
| portYIELD_FROM_ISR() will then ensure that this ISR returns directly to the | |
| higher priority unblocked task. */ | |
| portYIELD_FROM_ISR( lHigherPriorityTaskWoken ); | |
| } | |
| /*-----------------------------------------------------------*/ | |
| static void prvTXI_Handler( uint32_t ulUnusedParameter ) | |
| { | |
| unsigned char ucByte; | |
| long lHigherPriorityTaskWoken = pdFALSE; | |
| /* The parameter is not used. It is only present because Renesas drivers | |
| are used to install the interrupt handlers, and the drivers expect the | |
| parameter to be present. */ | |
| ( void ) ulUnusedParameter; | |
| /* Note the comments at the top of this file regarding the use of queues in | |
| this manner. */ | |
| if( xQueueReceiveFromISR( xCharsForTx, &ucByte, &lHigherPriorityTaskWoken ) == pdPASS ) | |
| { | |
| SCIF2.SCFTDR.BYTE = ucByte; | |
| /* Clear TDRE and TEND flag */ | |
| SCIF2.SCFSR.WORD &= ~0x0060; | |
| } | |
| else | |
| { | |
| /* No more characters. Disable the interrupt. */ | |
| SCIF2.SCSCR.BIT.TIE = 0; | |
| } | |
| /* If receiving from the queue has caused a task to unblock, and the | |
| unblocked task has a priority equal to or higher than the currently running | |
| task (the task this ISR interrupted), then lHigherPriorityTaskWoken will | |
| have automatically been set to pdTRUE within the queue receive function. | |
| portYIELD_FROM_ISR() will then ensure that this ISR returns directly to the | |
| higher priority unblocked task. */ | |
| portYIELD_FROM_ISR( lHigherPriorityTaskWoken ); | |
| } | |
| /*-----------------------------------------------------------*/ | |