RE: I can not communicate with SPI and TWI with timer example

y001 — Thu, 22 Nov 2018 07:42:41 GMT

solved.
Set a flag and set
while (true)
{
if (flag == true) {
// code
}
__ WFI ();
}
It solved it by doing.
Thank you very much

RE: I can not communicate with SPI and TWI with timer example

y001 — Thu, 22 Nov 2018 06:57:14 GMT

Thank you for reply!

I wrote timer_event_handler like the code below, but no data was written to the SD card.

void timer_twi_event_handler(nrf_timer_event_t event_type, void* p_context)
{

    switch (event_type)
    {
        case NRF_TIMER_EVENT_COMPARE1:
					
        
		    TWI_start();//ST
	        nrf_delay_us(5);
		    twi_init();
	        nrf_delay_us(5);
	      	LM75B_set_mode();//SAD+W,SUB(SUB[7] set to 1)
         	nrf_delay_us(100);
        	TWI_start();//SR
	    	nrf_delay_us(600);//600-500
	    	read_sensor_data();//SAD+R
	    	nrf_delay_us(4);
	        TWI_stop();//SP
	    	nrf_delay_us(5);
	
	        //uint8 to short(16bit)
        	x = (short)(m_sample[1] << 8 | m_sample[0]);
        	y = (short)(m_sample[3] << 8 | m_sample[2]);
    		z = (short)(m_sample[5] << 8 | m_sample[4]);


    
            x_g = (((float)x*2*2)/(float)65536);
	    	y_g = (((float)y*2*2)/(float)65536);
	    	z_g = (((float)z*2*2)/(float)65536);


	        sprintf(buf0,"%lf",x_g);
	        sprintf(buf1,"%lf",y_g);
	        sprintf(buf2,"%lf",z_g);
				
            fatfs_example(buf0,buf1,buf2);
					
            break;

        default:
            //Do nothing.
            break;
    }
}

As a result of describing like this, it did not work well, so it did not work well using flags as follows.

void timer_twi_event_handler(nrf_timer_event_t event_type, void* p_context)
{

    switch (event_type)
    {
        case NRF_TIMER_EVENT_COMPARE1:
					
        
				flag = true;
					
            break;

        default:
            //Do nothing.
            break;
    }
}

int main(){
//config


    if (flag == 1){

    //my spi&twi code
    
    flag = false;

    }
}

When I was watching other questioner's posts, I saw some people saying about priority, are there any relationships?

RE: I can not communicate with SPI and TWI with timer example

Jørgen Holmefjord — Wed, 21 Nov 2018 14:31:05 GMT

Hi,

There should be no issues with using timer together with SPI and TWI. You need to describe the issue in more details, and include some code showing what you have tried and what is not working, in order to get any help.

Best regards,
Jørgen