/**@brief Function for application main entry.
*/
int main(void)
{
uint32_t err_code;
bool erase_bonds;
// Initialize.
timers_init();
buttons_leds_init(&erase_bonds);
ble_stack_init();
device_manager_init(erase_bonds);
gap_params_init();
advertising_init();
services_init();
conn_params_init();
saadc_init();
// Start execution.
application_timers_start();
err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
APP_ERROR_CHECK(err_code);
// Enter main loop.
for (;;)
{
// trigger next ADC conversion
nrf_drv_saadc_sample_convert(0,&adc_sample);
advdata.p_manuf_specific_data->data.p_data[0] = adc_sample/100 + '0';
advdata.p_manuf_specific_data->data.p_data[1] = adc_sample%100/10 + '0';
advdata.p_manuf_specific_data->data.p_data[2] = adc_sample%10 + '0';
nrf_delay_ms(100);
ble_advdata_set(&advdata, NULL);
}
}
/**@brief Function for application main entry.
*/
int main(void)
{
uint32_t err_code;
// Initialize
timers_init();
ble_stack_init();
bsp_module_init();
scheduler_init();
gap_params_init();
advertising_init();
services_init();
conn_params_init();
sec_params_init();
adc_init();
// Start execution
timers_start();
err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
APP_ERROR_CHECK(err_code);
// Enter main loop
for (;;)
{
if(start_adc_sampling == true)
{
nrf_drv_saadc_sample_convert(0, &adc_value);
ble_android_characteristic_update(&m_android, &adc_value);
start_adc_sampling = false;
}
app_sched_execute();
// power_manage();
}
}
uint16_t analogin_read_u16(analogin_t *obj)
{
int16_t adc_value;
ret_code_t ret_code;
ret_code = nrf_drv_saadc_sample_convert(obj->adc_pin, &adc_value);
MBED_ASSERT(ret_code == NRF_SUCCESS);
if (adc_value < 0)
{
// Even in the single ended mode measured value can be {-0}. Saturation for avoid casting to a big integer.
return 0;
}
else
{
return (uint16_t) adc_value;
}
}
/** Initialize the analogin peripheral
*
* Configures the pin used by analogin.
* @param obj The analogin object to initialize
* @param pin The analogin pin name
*/
void analogin_init(analogin_t *obj, PinName pin)
{
MBED_ASSERT(obj);
/* Only initialize SAADC on first pin. */
static bool first_init = true;
if (first_init) {
first_init = false;
/* Use configuration from sdk_config.h.
* Default is:
* - 12 bit.
* - No oversampling.
* - Priority 7 (lowest).
* - No low power mode.
*/
nrf_drv_saadc_config_t adc_config = {
.resolution = (nrf_saadc_resolution_t)SAADC_CONFIG_RESOLUTION,
.oversample = (nrf_saadc_oversample_t)SAADC_CONFIG_OVERSAMPLE,
.interrupt_priority = SAADC_CONFIG_IRQ_PRIORITY,
.low_power_mode = SAADC_CONFIG_LP_MODE
};
ret_code_t result = nrf_drv_saadc_init(&adc_config, analog_in_event_handler);
MBED_ASSERT(result == NRF_SUCCESS);
/* Register interrupt handler in vector table. */
NVIC_SetVector(SAADC_IRQn, (uint32_t)SAADC_IRQHandler);
}
/* Use pinmap function to get associated channel. */
uint32_t channel = pinmap_function(pin, PinMap_ADC);
MBED_ASSERT(channel != (uint32_t) NC);
/* Account for an off-by-one in Channel definition and Input definition. */
nrf_saadc_input_t input = channel + 1;
/* Configure channel and pin:
* - the 1/4 gain and VDD/4 makes the reference voltage VDD.
*/
nrf_saadc_channel_config_t channel_config = {
.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
.resistor_n = NRF_SAADC_RESISTOR_DISABLED,
.gain = NRF_SAADC_GAIN1_4,
.reference = NRF_SAADC_REFERENCE_VDD4,
.acq_time = NRF_SAADC_ACQTIME_10US,
.mode = NRF_SAADC_MODE_SINGLE_ENDED,
.burst = NRF_SAADC_BURST_DISABLED,
.pin_p = input,
.pin_n = NRF_SAADC_INPUT_DISABLED
};
ret_code_t result = nrf_drv_saadc_channel_init(channel, &channel_config);
MBED_ASSERT(result == NRF_SUCCESS);
/* Store channel in ADC object. */
obj->channel = channel;
}
/** Read the input voltage, represented as a float in the range [0.0, 1.0]
*
* @param obj The analogin object
* @return A floating value representing the current input voltage
*/
uint16_t analogin_read_u16(analogin_t *obj)
{
MBED_ASSERT(obj);
/* Default return value is 0. */
uint16_t retval = 0;
/* Read single channel, blocking. */
nrf_saadc_value_t value = { 0 };
ret_code_t result = nrf_drv_saadc_sample_convert(obj->channel, &value);
/* nrf_saadc_value_t is a signed integer. Only take the absolute value. */
if ((result == NRF_SUCCESS) && (value > 0)) {
/* Normalize 12 bit ADC value to 16 bit Mbed ADC range. */
uint32_t normalized = value;
retval = (normalized * ADC_16BIT_RANGE) / ADC_12BIT_RANGE;
}
return retval;
}
