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Changed the way the ARM7/9 GCC ports enter interrupts that can cause a context switch.

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This commit is contained in:
Richard Barry 2007-10-28 13:55:35 +00:00
parent c54ec1c639
commit ada7fa862d
24 changed files with 322 additions and 275 deletions
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4
Demo/ARM7_LPC2106_GCC/serial/serial.c
View file

@ -118,7 +118,7 @@ xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned
{
unsigned portLONG ulDivisor, ulWantedClock;
xComPortHandle xReturn = serHANDLE;
extern void ( vUART_ISR )( void );
extern void ( vUART_ISR_Wrapper )( void );
/* The queues are used in the serial ISR routine, so are created from
serialISR.c (which is always compiled to ARM mode. */
@ -153,7 +153,7 @@ extern void ( vUART_ISR )( void );
/* Setup the VIC for the UART. */
VICIntSelect &= ~( serUART0_VIC_CHANNEL_BIT );
VICIntEnable |= serUART0_VIC_CHANNEL_BIT;
VICVectAddr1 = ( portLONG ) vUART_ISR;
VICVectAddr1 = ( portLONG ) vUART_ISR_Wrapper;
VICVectCntl1 = serUART0_VIC_CHANNEL | serUART0_VIC_ENABLE;
/* Enable UART0 interrupts. */

45
Demo/ARM7_LPC2106_GCC/serial/serialISR.c
View file

@ -80,9 +80,11 @@ static volatile portLONG lTHREEmpty;
*/
void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle *pxRxedChars, xQueueHandle *pxCharsForTx, portLONG volatile **pplTHREEmptyFlag );
/* UART0 interrupt service routine. This can cause a context switch so MUST
be declared "naked". */
void vUART_ISR( void ) __attribute__ ((naked));
/* UART0 interrupt service routine entry point. */
void vUART_ISR_Wrapper( void ) __attribute__ ((naked));
/* UART0 interrupt service routine handler. */
void vUART_ISR_Handler( void );
/*-----------------------------------------------------------*/
void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle *pxRxedChars,
@ -103,20 +105,24 @@ void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle
}
/*-----------------------------------------------------------*/
void vUART_ISR( void )
void vUART_ISR_Wrapper( void )
{
/* This ISR can cause a context switch, so the first statement must be a
call to the portENTER_SWITCHING_ISR() macro. This must be BEFORE any
variable declarations. */
portENTER_SWITCHING_ISR();
/* Save the context of the interrupted task. */
portSAVE_CONTEXT();
/* Now we can declare the local variables. These must be static. */
static signed portCHAR cChar;
static portBASE_TYPE xTaskWokenByTx, xTaskWokenByRx;
/* Call the handler. This must be a separate function from the wrapper
to ensure the correct stack frame is set up. */
vUART_ISR_Handler();
/* As these variables are static they must be initialised manually here. */
xTaskWokenByTx = pdFALSE;
xTaskWokenByRx = pdFALSE;
/* Restore the context of whichever task is going to run next. */
portRESTORE_CONTEXT();
}
/*-----------------------------------------------------------*/
void vUART_ISR_Handler( void )
{
signed portCHAR cChar;
portBASE_TYPE xTaskWokenByTx = pdFALSE, xTaskWokenByRx = pdFALSE;
/* What caused the interrupt? */
switch( UART0_IIR & serINTERRUPT_SOURCE_MASK )
@ -154,14 +160,15 @@ void vUART_ISR( void )
break;
}
if( xTaskWokenByTx || xTaskWokenByRx )
{
portYIELD_FROM_ISR();
}
/* Clear the ISR in the VIC. */
VICVectAddr = serCLEAR_VIC_INTERRUPT;
/* Exit the ISR. If a task was woken by either a character being received
or transmitted then a context switch will occur. */
portEXIT_SWITCHING_ISR( ( xTaskWokenByTx || xTaskWokenByRx ) );
}
/*-----------------------------------------------------------*/