Hi,
I have blocking TWI operation in app_timer callback to read fifo from accelerometer. It works just fine but I want to make it non-blocking to decrease current consumption. I am not able to do it. Could you please help me?
I tried to change the TWI IRQ priority from 3 to 1 but it had no effect. Variable FIFO_read is still false.
I use nRF51822QFACA, SDK10, Softdevice S110 v.8
volatile bool FIFO_read = false;
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
if(p_event->type == NRF_DRV_TWI_RX_DONE)
{
FIFO_read = true;
}
}
static void accel_timeout_handler(void * p_context)
{
uint8_t tx_x[] = {0x28}; //X axis out low
uint8_t tx_fifostatus[] = {0x2F}; //fifo status
uint8_t rx_x[192];
uint8_t rx_fifostatus[1];
uint8_t number_of_registers = 6;
const nrf_drv_twi_t p_twi_instance = NRF_DRV_TWI_INSTANCE(0);
nrf_drv_twi_config_t p_twi_config;
p_twi_config.scl = 2;
p_twi_config.sda = 1;
p_twi_config.frequency = NRF_TWI_FREQ_400K;
p_twi_config.interrupt_priority = 1;
uint32_t err_code = NRF_SUCCESS;
err_code = nrf_drv_twi_init(&p_twi_instance, &p_twi_config, twi_handler, NULL);
nrf_drv_twi_enable(&p_twi_instance);
err_code = nrf_drv_twi_tx(&p_twi_instance, 0x19, tx_fifostatus, sizeof(tx_fifostatus), true);
err_code = nrf_drv_twi_rx(&p_twi_instance, 0x19, rx_fifostatus, sizeof(rx_fifostatus), false);
err_code = nrf_drv_twi_tx(&p_twi_instance, 0x19, tx_x, sizeof(tx_x), true);
FIFO_read = false;
err_code = nrf_drv_twi_rx(&p_twi_instance, 0x19, rx_x, (rx_fifostatus[0] & 0x3F) * number_of_registers , false);
do{
__WFE();
}
while(FIFO_read == false);
}
Thank you.
