| /* | |
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| */ | |
| /* | |
| BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0. | |
| ***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 FIFOs or DMA if available, 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" | |
| /* Library includes. */ | |
| #include "mb9bf506n.h" | |
| #include "system_mb9bf50x.h" | |
| /* Demo application includes. */ | |
| #include "serial.h" | |
| /*-----------------------------------------------------------*/ | |
| /* Register bit definitions. */ | |
| #define serRX_INT_ENABLE 0x10 | |
| #define serTX_INT_ENABLE 0x08 | |
| #define serRX_ENABLE 0x02 | |
| #define serTX_ENABLE 0x01 | |
| #define serORE_ERROR_BIT 0x08 | |
| #define serFRE_ERROR_BIT 0x10 | |
| #define serPE_ERROR_BIT 0x20 | |
| #define serRX_INT 0x04 | |
| #define serTX_INT 0x02 | |
| /* Misc defines. */ | |
| #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 ) | |
| #define serNO_BLOCK ( ( TickType_t ) 0 ) | |
| /*-----------------------------------------------------------*/ | |
| /* 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 ) | |
| { | |
| /* Create the queues used to hold Rx/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 ) ) | |
| { | |
| /* Ensure interrupts don't fire during the init process. Interrupts | |
| will be enabled automatically when the first task start running. */ | |
| portDISABLE_INTERRUPTS(); | |
| /* Configure P21 and P22 for use by the UART. */ | |
| FM3_GPIO->PFR2 |= ( 1 << 0x01 ) | ( 1 << 0x02 ); | |
| /* SIN0_0 and SOT0_0. */ | |
| FM3_GPIO->EPFR07 |= ( 1 << 6 ); | |
| /* Reset. */ | |
| FM3_MFS0_UART->SCR = 0x80; | |
| /* Enable output in mode 0. */ | |
| FM3_MFS0_UART->SMR = 0x01; | |
| /* Clear all errors that may already be present. */ | |
| FM3_MFS0_UART->SSR = 0x00; | |
| FM3_MFS0_UART->ESCR = 0x00; | |
| FM3_MFS0_UART->BGR = ( configCPU_CLOCK_HZ / 2UL ) / ( ulWantedBaud - 1UL ); | |
| /* Enable Rx, Tx, and the Rx interrupt. */ | |
| FM3_MFS0_UART->SCR |= ( serRX_ENABLE | serTX_ENABLE | serRX_INT_ENABLE ); | |
| /* Configure the NVIC for UART interrupts. */ | |
| NVIC_ClearPendingIRQ( MFS0RX_IRQn ); | |
| NVIC_EnableIRQ( MFS0RX_IRQn ); | |
| /* The priority *MUST* be at or below | |
| configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY as FreeRTOS API functions | |
| are called in the interrupt handler. */ | |
| NVIC_SetPriority( MFS0RX_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY ); | |
| /* Do the same for the Tx interrupts. */ | |
| NVIC_ClearPendingIRQ( MFS0TX_IRQn ); | |
| NVIC_EnableIRQ( MFS0TX_IRQn ); | |
| /* The priority *MUST* be at or below | |
| configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY as FreeRTOS API functions | |
| are called in the interrupt handler. */ | |
| NVIC_SetPriority( MFS0TX_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY ); | |
| } | |
| /* 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 ) | |
| { | |
| 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 one UART. */ | |
| ( 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 ) | |
| { | |
| signed portBASE_TYPE xReturn; | |
| if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS ) | |
| { | |
| xReturn = pdPASS; | |
| /* Enable the UART Tx interrupt. */ | |
| FM3_MFS0_UART->SCR |= serTX_INT_ENABLE; | |
| } | |
| else | |
| { | |
| xReturn = pdFAIL; | |
| } | |
| return xReturn; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void vSerialClose( xComPortHandle xPort ) | |
| { | |
| /* Not supported as not required by the demo application. */ | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void MFS0RX_IRQHandler( void ) | |
| { | |
| portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
| char cChar; | |
| if( ( FM3_MFS0_UART->SSR & ( serORE_ERROR_BIT | serFRE_ERROR_BIT | serPE_ERROR_BIT ) ) != 0 ) | |
| { | |
| /* A PE, ORE or FRE error occurred. Clear it. */ | |
| FM3_MFS0_UART->SSR |= ( 1 << 7 ); | |
| cChar = FM3_MFS0_UART->RDR; | |
| } | |
| else if( FM3_MFS0_UART->SSR & serRX_INT ) | |
| { | |
| /* A character has been received on the USART, send it to the Rx | |
| handler task. */ | |
| cChar = FM3_MFS0_UART->RDR; | |
| xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ); | |
| } | |
| /* If sending or receiving from a 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 xHigherPriorityTaskWoken | |
| will have automatically been set to pdTRUE within the queue send or receive | |
| function. portEND_SWITCHING_ISR() will then ensure that this ISR returns | |
| directly to the higher priority unblocked task. */ | |
| portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void MFS0TX_IRQHandler( void ) | |
| { | |
| portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
| char cChar; | |
| if( FM3_MFS0_UART->SSR & serTX_INT ) | |
| { | |
| /* The interrupt was caused by the TX register 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 | |
| USART now. */ | |
| FM3_MFS0_UART->TDR = cChar; | |
| } | |
| else | |
| { | |
| /* Disable the Tx interrupt. */ | |
| FM3_MFS0_UART->SCR &= ~serTX_INT_ENABLE; | |
| } | |
| } | |
| /* If sending or receiving from a 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 xHigherPriorityTaskWoken | |
| will have automatically been set to pdTRUE within the queue send or receive | |
| function. portEND_SWITCHING_ISR() will then ensure that this ISR returns | |
| directly to the higher priority unblocked task. */ | |
| portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); | |
| } | |