Porting Project from SDK12.2 to SDK14.1, SAADC issue

[rms]

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.

[rms]

I tried with the DEBUG compiler flag with -03 but it still resets with any info, as soon as I start IR sensors notification. this is what I see

Triggering battery level update...
<info> saadc: Function: nrf_drv_saadc_init, error code: NRF_SUCCESS.
<info> saadc: Channel initialized: 1.
<info> saadc: Function: nrf_drv_saadc_channel_init, error code: NRF_SUCCESS.
<info> saadc: Conversion value: 7, channel: 1.
<warning> saadc: Function: nrf_drv_saadc_sample_convert, error code: NRF_SUCCESS.
<info> saadc: Channel denitialized: 1.
<info> saadc: Function: nrf_drv_saadc_channel_uninit, error code: NRF_SUCCESS.
<info> app: Connected.

2nd run without connecting

RAM Start: 20002140
BLE init
<info> app: Fast advertising.
After init
Triggering battery level update...
<info> saadc: Function: nrf_drv_saadc_init, error code: NRF_SUCCESS.
<info> saadc: Channel ini▒

After I connect and start notifications it resets with no info after these lines. If I just let it run without connecting it resets on its own after a small time. By the way the conversion value is very small its normally around 400ish for the battery when it is working correctly

SAADC module disabled, all SAADC code commented out, -O0 DEBUG & -O3 ok

SAADC module enabled, but all SAADC code commented out, -O0 DEBUG & -O3 ok

SAADC module enabled, only battery SAADC code un-commented , -O0 DEBUG Ok, -O3 reset forever

I will try to use non-blocking instead to see what happends