Hi, Here is the piece of code that is bugging me. The code algo is at every 500ms timer2 interrupts, and the adc captures 1500 samples and stores it in an array .I always have to stop the timer2 for printing and calculations and then start when it is done. Here newsamples is array; datatype is float and "ts" is integer defined as 1500 and IDE used is KEIL uVision 5.0.
KINDLY VERIFY WHAT IS THE PROBLEM AND HAVE I ENABLED/DISABLED TIMER2 INTERRUPTS CORRECTLY?
The following is the timer2 configuration
void start_timer(void)
{
NRF_TIMER2->MODE = TIMER_MODE_MODE_Timer; // Set the timer in Counter Mode
NRF_TIMER2->TASKS_CLEAR = 1; // clear the task first to be usable for later
NRF_TIMER2->PRESCALER = 8; //Set prescaler.
NRF_TIMER2->BITMODE = TIMER_BITMODE_BITMODE_16Bit; //Set counter to 16 bit resolution
NRF_TIMER2->CC[0] = 31250; //Set value for TIMER2 compare register 0
// Enable interrupt on Timer 2, both for CC[0] and CC[1] compare match events
NRF_TIMER2->INTENSET = (TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos) ;
//| (TIMER_INTENSET_COMPARE1_Enabled << TIMER_INTENSET_COMPARE1_Pos);
NVIC_EnableIRQ(TIMER2_IRQn);
NRF_TIMER2->SHORTS = (TIMER_SHORTS_COMPARE0_CLEAR_Enabled << TIMER_SHORTS_COMPARE0_CLEAR_Pos) & TIMER_SHORTS_COMPARE0_CLEAR_Msk;
NRF_TIMER2->TASKS_START = 1; // Start TIMER2
}
Following is timer2 IRQ
void TIMER2_IRQHandler(void)
{
if(NRF_TIMER2->EVENTS_COMPARE[0])
{
NRF_TIMER2->EVENTS_COMPARE[0] = 0; //Clear compare register 0 event
nrf_adc_conversion_event_clean();
i=0;
if(send==0)
{
while(i < ts)
{
adc_sample = nrf_adc_result_get();
nrf_delay_us(10);
newsamples[i]=adc_sample;
i++;
}
if(i >= ts)
{
send=1; //States samples are captured
}
}
// trigger next ADC conversion
nrf_adc_start();
}
}
Following is the Main loop
while (true)
{
if (send==1)
{
//Stop Timer2 to do calculations
NRF_TIMER2->TASKS_STOP = 1;
//PASSING ARRAY OF DATA TO LPF FILTER
filter(newsamples,ts);
//NVIC_DisableIRQ(ADC_IRQn);
printf("Going in While\n\r");
while(j <ts)
{
//printf("S: %06.0f , %d\r\n",newsamples[j],j);
newsamples[j]*=newsamples[j]; //Squaring each datapoint
accval+=newsamples[j]; //Adding squared values
j++;
} printf("Going out of while\n\r"); send=0;j=0; NRF_TIMER2->TASKS_START = 1;
}
It does not print all the newsamples values and instead prints garbage after 15th value and doesnt show the statement "Going out of while". Here is the output while1.png
But when I don't print newsamples it shows both the statements.
