Matthias
6cc948eef8
git-svn-id: file:///srv/dev-disk-by-uuid-17e88007-4d0c-45e0-8757-cacfcc458630/repositories/svn/Diplomarbeit@113 9fe90eed-be63-e94b-8204-d34ff4c2ff93
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/* ---------------------------------------------------------------------------
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* ssp0ISR.c - v0.1 (c) 2007 Micro-key bv
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* ---------------------------------------------------------------------------
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* Micro-key bv
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* Industrieweg 28, 9804 TG Noordhorn
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* Postbus 92, 9800 AB Zuidhorn
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* The Netherlands
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* Tel: +31 594 503020
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* Fax: +31 594 505825
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* Email: support@microkey.nl
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* Web: www.microkey.nl
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* ---------------------------------------------------------------------------
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* Description: Interrupt service routine for SSP0
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* ---------------------------------------------------------------------------
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* Version(s): 0.1, 28-11-2007, fvds.
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* Creation.
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* System include files
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* ---------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <stdlib.h>
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/* ---------------------------------------------------------------------------
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* Application include files
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* ---------------------------------------------------------------------------
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*/
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#include "LPC23xx.h"
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#include "types.h"
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#include "ssp1ISR.h"
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//#include "armVIC.h"
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/* FreeRTOS includes */
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#include "FreeRTOS.h"
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#include "Task.h"
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#include "queue.h"
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/* ---------------------------------------------------------------------------
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* Local constant and macro definitions
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* Global variable definitions
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* ---------------------------------------------------------------------------
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*/
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extern xQueueHandle ssp1DispatchedIsrQueue;
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/* ---------------------------------------------------------------------------
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* Local variable definitions
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* ---------------------------------------------------------------------------
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*/
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/* statistics of all the interrupts */
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static volatile UINT32 interruptRxStat = 0;
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static volatile UINT32 interruptOverRunStat = 0;
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static volatile UINT32 interruptRxTimeoutStat = 0;
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static UINT8 receivedByte;
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/* ---------------------------------------------------------------------------
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* Local function definitions
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* ---------------------------------------------------------------------------
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*/
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static void ssp1Handler( void );
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void ssp1ISR( void )
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{
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/* Save the context of the interrupted task. */
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portSAVE_CONTEXT();
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{
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ssp1Handler();
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}
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/* Restore the context of whichever task is going to run once the interrupt
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completes. */
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portRESTORE_CONTEXT();
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}
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void ssp1Handler( void )
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{
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UINT32 regValue;
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regValue = SSP1MIS;
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if ( regValue & SSPMIS_RORMIS ) /* Receive overrun interrupt */
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{
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interruptOverRunStat++;
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SSP1ICR = SSPICR_RORIC; /* clear interrupt */
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}
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if ( regValue & SSPMIS_RTMIS ) /* Receive timeout interrupt */
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{
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interruptRxTimeoutStat++;
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while ( SSP1SR & SSPSR_RNE ) // While not empty
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{
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receivedByte = SSP1DR;
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xQueueSendToBackFromISR( ssp1DispatchedIsrQueue, &receivedByte, pdFALSE );
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}
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SSP1ICR = SSPICR_RTIC; /* clear interrupt */
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}
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/* please be aware that, in main and ISR, CurrentRxIndex and CurrentTxIndex
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are shared as global variables. It may create some race condition that main
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and ISR manipulate these variables at the same time. SSPSR_BSY checking (polling)
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in both main and ISR could prevent this kind of race condition */
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if ( regValue & SSPMIS_RXMIS ) /* Rx at least half full */
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{
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interruptRxStat++; /* receive until it's empty */
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while ( SSP1SR & SSPSR_RNE ) // While not empty
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{
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receivedByte = SSP1DR;
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xQueueSendToBackFromISR( ssp1DispatchedIsrQueue, &receivedByte, pdFALSE );
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}
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}
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VICVectAddr = 0; /* Acknowledge Interrupt */
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}
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