/* | |
FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd. | |
All rights reserved | |
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*/ | |
/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER. | |
NOTE: This driver is primarily to test the scheduler functionality. It does | |
not effectively use the buffers or DMA and is therefore not intended to be | |
an example of an efficient driver. */ | |
/* Standard include file. */ | |
#include <stdlib.h> | |
/* Scheduler include files. */ | |
#include "FreeRTOS.h" | |
#include "queue.h" | |
#include "task.h" | |
/* Demo app include files. */ | |
#include "serial.h" | |
/* Hardware definitions. */ | |
#define serNO_PARITY ( ( unsigned char ) 0x02 << 3 ) | |
#define ser8DATA_BITS ( ( unsigned char ) 0x03 ) | |
#define ser1STOP_BIT ( ( unsigned char ) 0x07 ) | |
#define serSYSTEM_CLOCK ( ( unsigned char ) 0xdd ) | |
#define serTX_OUTPUT ( ( unsigned char ) 0x04 ) | |
#define serRX_INPUT ( ( unsigned char ) 0x08 ) | |
#define serTX_ENABLE ( ( unsigned char ) 0x04 ) | |
#define serRX_ENABLE ( ( unsigned char ) 0x01 ) | |
#define serTX_INT ( ( unsigned char ) 0x01 ) | |
#define serRX_INT ( ( unsigned char ) 0x02 ) | |
/* The queues used to communicate between tasks and ISR's. */ | |
static QueueHandle_t xRxedChars; | |
static QueueHandle_t xCharsForTx; | |
/* Flag used to indicate the tx status. */ | |
static portBASE_TYPE xTxHasEnded = pdTRUE; | |
/*-----------------------------------------------------------*/ | |
/* The UART interrupt handler. */ | |
void __attribute__( ( interrupt ) ) __cs3_isr_interrupt_78( void ); | |
/*-----------------------------------------------------------*/ | |
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
{ | |
const unsigned long ulBaudRateDivisor = ( configCPU_CLOCK_HZ / ( 32UL * ulWantedBaud ) ); | |
/* Create the queues used by the com test task. */ | |
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) ); | |
xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) ); | |
xTxHasEnded = pdTRUE; | |
/* Set the pins to UART mode. */ | |
MCF_PAD_PUAPAR |= ( serTX_OUTPUT | serRX_INPUT ); | |
/* Reset the peripheral. */ | |
MCF_UART1_UCR = MCF_UART_UCR_RESET_RX; | |
MCF_UART1_UCR = MCF_UART_UCR_RESET_TX; | |
MCF_UART1_UCR = MCF_UART_UCR_RESET_ERROR; | |
MCF_UART1_UCR = MCF_UART_UCR_RESET_BKCHGINT; | |
MCF_UART1_UCR = MCF_UART_UCR_RESET_MR | MCF_UART_UCR_RX_DISABLED | MCF_UART_UCR_TX_DISABLED; | |
/* Configure the UART. */ | |
MCF_UART1_UMR1 = serNO_PARITY | ser8DATA_BITS; | |
MCF_UART1_UMR2 = ser1STOP_BIT; | |
MCF_UART1_UCSR = serSYSTEM_CLOCK; | |
MCF_UART1_UBG1 = ( unsigned char ) ( ( ulBaudRateDivisor >> 8UL ) & 0xffUL ); | |
MCF_UART1_UBG2 = ( unsigned char ) ( ulBaudRateDivisor & 0xffUL ); | |
/* Turn it on. */ | |
MCF_UART1_UCR = serTX_ENABLE | serRX_ENABLE; | |
/* Configure the interrupt controller. Run the UARTs above the kernel | |
interrupt priority for demo purposes. */ | |
MCF_INTC0_ICR14 = ( ( configMAX_SYSCALL_INTERRUPT_PRIORITY - 2 ) << 3 ); | |
MCF_INTC0_IMRL &= ~( MCF_INTC_IMRL_INT_MASK14 | 0x01 ); | |
/* The Tx interrupt is not enabled until there is data to send. */ | |
MCF_UART1_UIMR = serRX_INT; | |
/* Only a single port is implemented so we don't need to return anything. */ | |
return NULL; | |
} | |
/*-----------------------------------------------------------*/ | |
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime ) | |
{ | |
/* Only one port is supported. */ | |
( 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; | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime ) | |
{ | |
/* Only one port is supported. */ | |
( void ) pxPort; | |
/* Return false if after the block time there is no room on the Tx queue. */ | |
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) | |
{ | |
return pdFAIL; | |
} | |
/* A critical section should not be required as xTxHasEnded will not be | |
written to by the ISR if it is already 0 (is this correct?). */ | |
if( xTxHasEnded != pdFALSE ) | |
{ | |
xTxHasEnded = pdFALSE; | |
MCF_UART1_UIMR = serRX_INT | serTX_INT; | |
} | |
return pdPASS; | |
} | |
/*-----------------------------------------------------------*/ | |
void vSerialClose( xComPortHandle xPort ) | |
{ | |
( void ) xPort; | |
} | |
/*-----------------------------------------------------------*/ | |
void __cs3_isr_interrupt_78( void ) | |
{ | |
unsigned char ucChar; | |
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE, xDoneSomething = pdTRUE; | |
while( xDoneSomething != pdFALSE ) | |
{ | |
xDoneSomething = pdFALSE; | |
/* Does the tx buffer contain space? */ | |
if( ( MCF_UART1_USR & MCF_UART_USR_TXRDY ) != 0x00 ) | |
{ | |
/* Are there any characters queued to be sent? */ | |
if( xQueueReceiveFromISR( xCharsForTx, &ucChar, &xHigherPriorityTaskWoken ) == pdTRUE ) | |
{ | |
/* Send the next char. */ | |
MCF_UART1_UTB = ucChar; | |
xDoneSomething = pdTRUE; | |
} | |
else | |
{ | |
/* Turn off the Tx interrupt until such time as another character | |
is being transmitted. */ | |
MCF_UART1_UIMR = serRX_INT; | |
xTxHasEnded = pdTRUE; | |
} | |
} | |
if( MCF_UART1_USR & MCF_UART_USR_RXRDY ) | |
{ | |
ucChar = MCF_UART1_URB; | |
xQueueSendFromISR( xRxedChars, &ucChar, &xHigherPriorityTaskWoken ); | |
xDoneSomething = pdTRUE; | |
} | |
} | |
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); | |
} | |