/**
* @brief Function for initializing SAADC.
*/
static ret_code_t saadc_init(void)
{
ret_code_t err_code;
static nrf_saadc_value_t saadc_value;
saadc_channel.gain = NRF_SAADC_GAIN1_3;
err_code = nrf_drv_saadc_init(NULL, saadc_handler);
if (err_code != NRF_SUCCESS)
{
return NRF_ERROR_INTERNAL;
}
nrf_gpio_pin_set(m_csense.output_pin);
err_code = nrf_drv_saadc_channel_init(0, &saadc_channel);
if (err_code != NRF_SUCCESS)
{
return NRF_ERROR_INTERNAL;
}
err_code = nrf_drv_saadc_buffer_convert(&saadc_value, 1);
if (err_code != NRF_SUCCESS)
{
return NRF_ERROR_INTERNAL;
}
nrf_saadc_disable();
return NRF_SUCCESS;
}
void nrf_drv_saadc_uninit(void)
{
ASSERT(m_cb.state != NRF_DRV_STATE_UNINITIALIZED);
nrf_saadc_int_disable(NRF_SAADC_INT_ALL);
nrf_drv_common_irq_disable(SAADC_IRQn);
nrf_saadc_task_trigger(NRF_SAADC_TASK_STOP);
// Wait for ADC being stopped.
uint32_t timeout = HW_TIMEOUT;
while (nrf_saadc_event_check(NRF_SAADC_EVENT_STOPPED) == 0 && timeout > 0)
{
--timeout;
}
ASSERT(timeout > 0);
nrf_saadc_disable();
m_cb.adc_state = NRF_SAADC_STATE_IDLE;
for (uint8_t channel = 0; channel < NRF_SAADC_CHANNEL_COUNT; ++channel)
{
if (m_cb.psel[channel].pselp != NRF_SAADC_INPUT_DISABLED)
{
(void)nrf_drv_saadc_channel_uninit(channel);
}
}
m_cb.state = NRF_DRV_STATE_UNINITIALIZED;
}
/**
* @brief Function for handling conversion values.
*
* @param[in] val Value received from ADC or COMP.
*/
static void conversion_handler(uint16_t val)
{
nrf_drv_csense_evt_t event_struct;
#if USE_COMP == 0
nrf_gpio_pin_set(m_csense.output_pin);
#endif //USE_COMP
m_csense.analog_values[m_csense.cur_chann_idx] = val;
event_struct.read_value = val;
event_struct.analog_channel = m_csense.cur_chann_idx;
m_csense.channels_to_read &= ~(1UL<<m_csense.cur_chann_idx);
// decide if there will be more conversions
if(m_csense.channels_to_read == 0)
{
m_csense.busy = false;
#if USE_COMP == 0 && defined(SAADC_PRESENT)
nrf_saadc_disable();
#endif
}
m_csense.event_handler(&event_struct);
if(m_csense.channels_to_read > 0) // Start new conversion.
{
ret_code_t err_code;
calculate_next_channel();
err_code = nrf_drv_csense_sample();
if(err_code != NRF_SUCCESS)
{
return;
}
}
}