felipecpc wrote on Wednesday, November 25, 2009:
Hi,
I’m a little bit confused abou using interrupt.
I’ve been trying to configure a ADC data ready interrupt with freertos, but it doesn’ t work correctly.
So , here my code:
adcconfig.c
#include “adcconfig.h”
static unsigned int chns = {ADC_NUM_1, ADC_NUM_2, ADC_NUM_3, ADC_NUM_4,ADC_NUM_5,ADC_NUM_6,ADC_NUM_7,ADC_NUM_8};
extern void vAdcISREntry( void );
__arm void vAdcISR( void );
__arm void vAdcISR( void )
{
unsigned int status, i;
status = ADC_GetStatus(AT91C_BASE_ADC);
for(i=0;i<8;i++) {
if (ADC_IsChannelInterruptStatusSet(status, chns_)) {
ADC_DisableIt(AT91C_BASE_ADC, 1<<chns);//disable EOCx interrupt
conversionDone |= 1<<chns;
}
}
AT91C_BASE_AIC->AIC_EOICR = 0;
}
void setupAD (void){
ADC_Initialize( AT91C_BASE_ADC,
AT91C_ID_ADC,
AT91C_ADC_TRGEN_DIS,
0,
AT91C_ADC_SLEEP_NORMAL_MODE,
AT91C_ADC_LOWRES_10_BIT,
BOARD_MCK,
BOARD_ADC_FREQ,
10,
1200);
ADC_EnableChannel(AT91C_BASE_ADC, ADC_NUM_1);
ADC_EnableChannel(AT91C_BASE_ADC, ADC_NUM_2);
ADC_EnableChannel(AT91C_BASE_ADC, ADC_NUM_3);
ADC_EnableChannel(AT91C_BASE_ADC, ADC_NUM_4);
ADC_EnableChannel(AT91C_BASE_ADC, ADC_NUM_5);
ADC_EnableChannel(AT91C_BASE_ADC, ADC_NUM_6);
ADC_EnableChannel(AT91C_BASE_ADC, ADC_NUM_7);
ADC_EnableChannel(AT91C_BASE_ADC, ADC_NUM_8);
IRQ_ConfigureIT(AT91C_ID_ADC, 0, ( void (*)( void ) ) vAdcISR);
IRQ_EnableIT(AT91C_ID_ADC);
}
adcISR.s79
RSEG ICODE:CODE
CODE32
EXTERN vAdcISR
PUBLIC vAdcISREntry
; Wrapper for the serial port interrupt service routine. This can cause a
; context switch so requires an assembly wrapper.
; Defines the portSAVE_CONTEXT and portRESTORE_CONTEXT macros.
#include “ISR_Support.h”
vAdcISREntry
portSAVE_CONTEXT ; Save the context of the current task.
bl vAdcISR ; Call the ISR routine.
portRESTORE_CONTEXT ; Restore the context of the current task -
; which may be different to the task that
; was interrupted.
END
I started AD in main before my tasks, and inside a task i want to get de ADC value each 1 second for example.
when i run getMeasure in my task, the program freeze and i get data abort exception .
So, what i supossed to do ?
Thanks !
_