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Tidy up and comment.

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This commit is contained in:
Richard Barry 2009-01-28 12:21:11 +00:00
parent dd9ed87596
commit f5e095e34f
11 changed files with 157 additions and 451 deletions
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38
Demo/NEC_V850ES_Fx3_IAR/serial/serial.c
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@ -49,6 +49,9 @@
/*
BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
*NOTE* - This file is designed to test some of the RTOS features - it is
not intended to represent an efficient implementation!
*/
/* Standard includes. */
@ -62,10 +65,9 @@
#include "serial.h"
/* Hardware specifics. */
#define serRX_DATA_PIN ( 0x01 )
#define serTX_DATA_PIN ( 0x02 )
#define serCLOCK_Fxx_DIV_8 0x03
#define serUPWR ( 0x80 )
#define serUTXE ( 0x40 )
@ -87,12 +89,10 @@ static xQueueHandle xCharsForTx;
/*-----------------------------------------------------------*/
/* Interrupt entry point written in the assembler file serialISR.s79. */
/* Interrupt entry point written in the assembler file serialISR.s85. */
extern void vSerialISREntry( void );
/* The interrupt service routine - called from the assembly entry point. */
void vSerialISR( void );
/* Flag to indicate whether or not there are characters already queued to send. */
static volatile unsigned long ulTxInProgress = pdFALSE;
/*-----------------------------------------------------------*/
@ -103,7 +103,6 @@ static volatile unsigned long ulTxInProgress = pdFALSE;
xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
xComPortHandle xReturn = serHANDLE;
extern void ( vUART_ISR )( void );
const unsigned portLONG ulFuclk = ( configCPU_CLOCK_HZ / 2 ) / 8UL;
/* Create the queues used to hold Rx and Tx characters. */
@ -127,8 +126,9 @@ const unsigned portLONG ulFuclk = ( configCPU_CLOCK_HZ / 2 ) / 8UL;
/* Enable, n81. */
UD0CTL0 = ( serUPWR | serUTXE | serURXE | serUCL | serLSB );
UD0TIC = 0x07; /* UARTA0 transmit enable interrupt request signal clear, mask release, priority level 7 set */
UD0RIC = 0x07; /* UARTA0 receive end interrupt request signal clear, mask release, priority level 7 set */
/* Enable interrupts for both Rx and Tx. */
UD0TIC = 0x07;
UD0RIC = 0x07;
ulTxInProgress = pdFALSE;
}
@ -193,6 +193,8 @@ portBASE_TYPE xReturn = pdPASS;
portENTER_CRITICAL();
{
/* There are currently no characters queued up to send so write the
character directly to the UART. */
if( ulTxInProgress == pdFALSE )
{
UD0TX = cOutChar;
@ -200,6 +202,8 @@ portBASE_TYPE xReturn = pdPASS;
}
else
{
/* The UART is already busy so write the character to the Tx queue.
The queue is drained from within the Tx interrupt. */
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
{
xReturn = pdFAIL;
@ -218,32 +222,46 @@ void vSerialClose( xComPortHandle xPort )
}
/*-----------------------------------------------------------*/
/* Tx interrupt handler. This is called from the asm file wrapper. */
void vUARTTxISRHandler( void )
{
char cChar;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
/* Are there any more characters queue to transmit? */
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
{
/* Send the next character. */
UD0TX = cChar;
}
else
{
/* The UART is no longer active. */
ulTxInProgress = pdFALSE;
}
/* If reading a character from the Rx queue caused a task to unblock, and
the unblocked task has a priority higher than the currently running task,
then xHigherPriorityTaskWoken will have been set to true and a context
switch should occur now. */
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}
/*-----------------------------------------------------------*/
/* Rx interrupt handler. This is called from the asm file wrapper. */
void vUARTRxISRHandler( void )
{
portCHAR cChar;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
/* Send the received character to the Rx queue. */
cChar = UD0RX;
xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
/* If sending a character to the Tx queue caused a task to unblock, and
the unblocked task has a priority higher than the currently running task,
then xHigherPriorityTaskWoken will have been set to true and a context
switch should occur now. */
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}