I had the following setup, two app_timers triggering blocking SAADC reads in the callback functions
app_timer 1000ms triggering 1 Blocking SAADC read (For battery service, default Bluetooth SIG battery service)
ret_code_t err_code;
nrf_saadc_value_t data_buffer = 0;
nrf_saadc_channel_config_t channel_config1 =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN4);
err_code = nrf_drv_saadc_init(NULL,battery_level_adc_event_handler );
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_channel_init(SAADC_CHANNEL_BAS, &channel_config1);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_sample_convert(SAADC_CHANNEL_BAS, &data_buffer);
APP_ERROR_CHECK(err_code);
nrf_drv_saadc_channel_uninit(SAADC_CHANNEL_BAS);
nrf_drv_saadc_uninit();
//static nrf_saadc_value_t prev_data_buffer = 500;
float battery_in_percent = 0.0;
if(data_buffer > 145)
{
battery_in_percent = slope * (data_buffer-147);
if(battery_in_percent > 100)
{
battery_in_percent = 100;
}
NRF_LOG_RAW_INFO("Battery in percent %d\n", (uint8_t)battery_in_percent);
//prev_data_buffer = data_buffer;
}
else
{
battery_in_percent = 0;
}
err_code = ble_bas_battery_level_update(m_bas, (uint8_t)battery_in_percent); //Send the battery level over BLE
if ((err_code != NRF_SUCCESS) &&
(err_code != NRF_ERROR_INVALID_STATE) &&
(err_code != NRF_ERROR_RESOURCES) &&
(err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
)
{
NRF_LOG_ERROR("Battery Service Error: %u\n", err_code);
APP_ERROR_HANDLER(err_code); //Assert on error
}
app_timer 1000ms triggering 5 Blocking SAADC reads (custom service characteristic), 5 IR sensor connected to multiplexer connected to AIN5, write_linear_array() selects which pin on the multiplexer is being used
ret_code_t err_code;
enable_linear_array();
nrf_saadc_channel_config_t channel_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN5);
err_code = nrf_drv_saadc_init(NULL, saadc_callback);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_channel_init(SAADC_CHANNEL, &channel_config);
APP_ERROR_CHECK(err_code);
config_linear_array_out();
uint8_t sample_counter = 0;
nrf_saadc_value_t data_buffer=0 ;
uint8_t readINflags = 0;
/* Sample 1 */
write_linear_array(sample_counter);
err_code = nrf_drv_saadc_sample_convert(0, &data_buffer);
APP_ERROR_CHECK(err_code);
if(err_code)
return err_code;
if(data_buffer > IR_SENSOR_THRESHOLD){
readINflags |= 0b00000001;
}
/* Sample 2*/
sample_counter++;
write_linear_array(sample_counter);
err_code = nrf_drv_saadc_sample_convert(0, &data_buffer);
APP_ERROR_CHECK(err_code);
if(data_buffer > IR_SENSOR_THRESHOLD){
readINflags |= 0b00000010;
}
/* Sample 3 */
sample_counter++;
write_linear_array(sample_counter);
err_code = nrf_drv_saadc_sample_convert(0, &data_buffer);
APP_ERROR_CHECK(err_code);
if(data_buffer > IR_SENSOR_THRESHOLD){
readINflags |= 0b00000100;
}
/* Sample 4 */
sample_counter++;
write_linear_array(sample_counter);
err_code = nrf_drv_saadc_sample_convert(0, &data_buffer);
APP_ERROR_CHECK(err_code);
if(data_buffer > IR_SENSOR_THRESHOLD){
readINflags |= 0b00001000;
}
/* Sample 5 */
sample_counter++;
write_linear_array(sample_counter);
err_code = nrf_drv_saadc_sample_convert(0, &data_buffer);
APP_ERROR_CHECK(err_code);
if(data_buffer > IR_SENSOR_THRESHOLD){
readINflags |= 0b00010000;
}
disable_linear_array();
nrf_drv_saadc_channel_uninit(SAADC_CHANNEL);
nrf_drv_saadc_uninit();
The battery measurement app_timer is always running, the other one is on demand (if notify happens on custom characteristic) Both characteristics have read and notify properties. For the custom characteristic a read will the code above directly outside the app_timer.
These worked fine with SDK12.2 and SDK13, however recently I started porting the project to SDK14.1 and the following is happening. When debugging there are no errors and I can read the characteristics fine via BLE or occasionally I get an unknown fault at 0x000128A0 or 0x00014CCC. When compiled with -O3 and not in debug, it runs for a while then goes into a reset loop (keeps resetting) after running for a while or after trying to read the custom characteristic.
With app_timers still running and the SAADC portions completely commented out [and the SAADC disabled as module] I have no issues.
