| /* | |
| FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd. | |
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| */ | |
| /* | |
| BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR a UARTLite peripheral. | |
| */ | |
| /* Scheduler includes. */ | |
| #include "FreeRTOS.h" | |
| #include "queue.h" | |
| #include "comtest_strings.h" | |
| /* Library includes. */ | |
| #include "xuartlite.h" | |
| #include "xuartlite_l.h" | |
| /* Demo application includes. */ | |
| #include "serial.h" | |
| /*-----------------------------------------------------------*/ | |
| /* Functions that are installed as the handler for interrupts that are caused by | |
| Rx and Tx events respectively. */ | |
| static void prvRxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount ); | |
| static void prvTxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount ); | |
| /* Structure that hold the state of the UARTLite peripheral used by this demo. | |
| This is used by the Xilinx peripheral driver API functions. */ | |
| static XUartLite xUartLiteInstance; | |
| /* The queue used to hold received characters. */ | |
| static xQueueHandle xRxedChars; | |
| /*-----------------------------------------------------------*/ | |
| xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
| { | |
| portBASE_TYPE xStatus; | |
| /* The standard demo header file requires a baud rate to be passed into this | |
| function. However, in this case the baud rate is configured when the | |
| hardware is generated, leaving the ulWantedBaud parameter redundant. */ | |
| ( void ) ulWantedBaud; | |
| /* Create the queue used to hold Rx characters. */ | |
| xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) ); | |
| /* If the queue was created correctly, then setup the serial port | |
| hardware. */ | |
| if( xRxedChars != NULL ) | |
| { | |
| xStatus = XUartLite_Initialize( &xUartLiteInstance, XPAR_UARTLITE_1_DEVICE_ID ); | |
| if( xStatus == XST_SUCCESS ) | |
| { | |
| /* Complete initialisation of the UART and its associated | |
| interrupts. */ | |
| XUartLite_ResetFifos( &xUartLiteInstance ); | |
| /* Install the handlers that the standard Xilinx library interrupt | |
| service routine will call when Rx and Tx events occur | |
| respectively. */ | |
| XUartLite_SetRecvHandler( &xUartLiteInstance, ( XUartLite_Handler ) prvRxHandler, NULL ); | |
| XUartLite_SetSendHandler( &xUartLiteInstance, ( XUartLite_Handler ) prvTxHandler, NULL ); | |
| /* Install the standard Xilinx library interrupt handler itself. | |
| *NOTE* The xPortInstallInterruptHandler() API function must be used | |
| for this purpose. */ | |
| xStatus = xPortInstallInterruptHandler( XPAR_INTC_0_UARTLITE_1_VEC_ID, ( XInterruptHandler ) XUartLite_InterruptHandler, &xUartLiteInstance ); | |
| /* Enable the interrupt in the peripheral. */ | |
| XUartLite_EnableIntr( xUartLiteInstance.RegBaseAddress ); | |
| /* Enable the interrupt in the interrupt controller. | |
| *NOTE* The vPortEnableInterrupt() API function must be used for this | |
| purpose. */ | |
| vPortEnableInterrupt( XPAR_INTC_0_UARTLITE_1_VEC_ID ); | |
| } | |
| configASSERT( xStatus == pdPASS ); | |
| } | |
| /* This demo file only supports a single port but something must be | |
| returned to comply with the standard demo header file. */ | |
| return ( xComPortHandle ) 0; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| 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 receive queue. 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 ) | |
| { | |
| ( void ) pxPort; | |
| /* Output uxStringLength bytes starting from pcString. */ | |
| XUartLite_Send( &xUartLiteInstance, ( unsigned char * ) pcString, usStringLength ); | |
| } | |
| /*-----------------------------------------------------------*/ | |
| static void prvRxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount ) | |
| { | |
| signed char cRxedChar; | |
| portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
| ( void ) pvUnused; | |
| ( void ) uxByteCount; | |
| /* Place any received characters into the receive queue. */ | |
| while( XUartLite_IsReceiveEmpty( xUartLiteInstance.RegBaseAddress ) == pdFALSE ) | |
| { | |
| cRxedChar = XUartLite_ReadReg( xUartLiteInstance.RegBaseAddress, XUL_RX_FIFO_OFFSET); | |
| xQueueSendFromISR( xRxedChars, &cRxedChar, &xHigherPriorityTaskWoken ); | |
| } | |
| /* If calling xQueueSendFromISR() caused a task to unblock, and the task | |
| that unblocked has a priority equal to or greater than the task currently | |
| in the Running state (the task that was interrupted), then | |
| xHigherPriorityTaskWoken will have been set to pdTRUE internally within the | |
| xQueueSendFromISR() API function. If xHigherPriorityTaskWoken is equal to | |
| pdTRUE then a context switch should be requested to ensure that the | |
| interrupt returns to the highest priority task that is able to run. */ | |
| portYIELD_FROM_ISR( xHigherPriorityTaskWoken ); | |
| } | |
| /*-----------------------------------------------------------*/ | |
| static void prvTxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount ) | |
| { | |
| ( void ) pvUnused; | |
| ( void ) uxByteCount; | |
| /* Nothing to do here. The Xilinx library function takes care of the | |
| transmission. */ | |
| portNOP(); | |
| } | |