Hello,
I changed saadc.zip for my application needs
nrfx_saadc - buildconf. error PPI_CHEN / DPPIC_CHEN
and would like to plot the incoming serial data from ADC as asked in
Provide data from .c file to .py file VS Code - matplotlib.pyplot
For time evaluation I would like to have some arduino style millis() or micros() function, or even application time like app_timer_cnt_get(). Unfortunately this function isnt available in nrf connect sdk.
I used counter/alarm example and insert CONFIG_COUNTER_TIMER1=y to prj.conf.
Now whats confusing me is the now_usec output in the serial monitor. The code is
static void test_counter_interrupt_fn1(const struct device *counter_dev,
uint8_t chan_id, uint32_t ticks,
void *user_data)
{
struct counter_alarm_cfg *config = user_data;
uint32_t now_ticks;
uint64_t now_usec;
int now_sec;
int err;
err = counter_get_value(counter_dev, &now_ticks);
if (err) {
printk("Failed to read counter value (err %d)", err);
return;
}
now_usec = counter_ticks_to_us(counter_dev, now_ticks);
// printk("now_usec = ");
// printk(now_usec);
// printk("\n");
now_sec = (int)(now_usec / USEC_PER_SEC);
//now_usec = (int)now_usec;
printk("!!! Alarm 1 !!!\n");
printk("Now usec: %u\n", now_usec);
printk("Now sec: %u\n", now_sec);
/* Set a new alarm with a double length duration */
//config->ticks = config->ticks; // * 2U;
// printk("Set alarm in %u sec (%u ticks)\n",
// (uint32_t)(counter_ticks_to_us(counter_dev,
// config->ticks) / USEC_PER_SEC),
// config->ticks);
err = counter_set_channel_alarm(counter_dev, ALARM_CHANNEL_ID,
user_data);
if (err != 0) {
printk("Alarm could not be set\n");
}
}
When I set the channel alarm I get the output "Set alarm in 2 sec (32 000 000 ticks), but every 2 sec interrupt in the code above outputs
Now usec: 536870968
Now sec: 2
or
Now usec: 536870968
Now sec: 4
Is there a more convenient way to get the application time or to measure passed timer for evaluate the time step between two ADC samples?
Like arduino code
if( (millis() - prevTime) >= DELAYTIME ) {
prevTime = millis();
//do smthg
}
