ret_code_t nrf_drv_saadc_sample_convert(uint8_t channel, nrf_saadc_value_t * p_value)
{
if (m_cb.adc_state != NRF_SAADC_STATE_IDLE)
{
return NRF_ERROR_BUSY;
}
m_cb.adc_state = NRF_SAADC_STATE_BUSY;
nrf_saadc_int_disable(NRF_SAADC_INT_END);
nrf_saadc_buffer_init(p_value, 1);
nrf_saadc_channel_input_set(channel,
m_cb.psel[channel].pselp, m_cb.psel[channel].pseln);
nrf_saadc_task_trigger(NRF_SAADC_TASK_START);
nrf_saadc_task_trigger(NRF_SAADC_TASK_SAMPLE);
uint32_t timeout = 100000;
while (0 == nrf_saadc_event_check(NRF_SAADC_EVENT_END) && timeout > 0)
{
timeout--;
}
nrf_saadc_event_clear(NRF_SAADC_EVENT_END);
nrf_saadc_channel_input_set(channel, NRF_SAADC_INPUT_DISABLED, NRF_SAADC_INPUT_DISABLED);
nrf_saadc_int_enable(NRF_SAADC_INT_END);
m_cb.adc_state = NRF_SAADC_STATE_IDLE;
return NRF_SUCCESS;
}
ret_code_t nrf_drv_saadc_sample_convert(uint8_t channel, nrf_saadc_value_t * p_value)
{
if (m_cb.adc_state != NRF_SAADC_STATE_IDLE)
{
return NRF_ERROR_BUSY;
}
m_cb.adc_state = NRF_SAADC_STATE_BUSY;
nrf_saadc_int_disable(NRF_SAADC_INT_STARTED | NRF_SAADC_INT_END);
nrf_saadc_buffer_init(p_value, 1);
if (m_cb.active_channels > 1)
{
for (uint8_t i = 0; i < NRF_SAADC_CHANNEL_COUNT; ++i)
{
nrf_saadc_channel_input_set(i, NRF_SAADC_INPUT_DISABLED, NRF_SAADC_INPUT_DISABLED);
}
}
nrf_saadc_channel_input_set(channel,
m_cb.psel[channel].pselp, m_cb.psel[channel].pseln);
nrf_saadc_task_trigger(NRF_SAADC_TASK_START);
nrf_saadc_task_trigger(NRF_SAADC_TASK_SAMPLE);
uint32_t timeout = HW_TIMEOUT;
while (0 == nrf_saadc_event_check(NRF_SAADC_EVENT_END) && timeout > 0)
{
timeout--;
}
nrf_saadc_event_clear(NRF_SAADC_EVENT_END);
if (m_cb.active_channels > 1)
{
for (uint8_t i = 0; i < NRF_SAADC_CHANNEL_COUNT; ++i)
{
nrf_saadc_channel_input_set(i, m_cb.psel[i].pselp, m_cb.psel[i].pseln);
}
}
if (m_cb.low_power_mode)
{
nrf_saadc_int_enable(NRF_SAADC_INT_STARTED | NRF_SAADC_INT_END);
}
else
{
nrf_saadc_int_enable(NRF_SAADC_INT_END);
}
m_cb.adc_state = NRF_SAADC_STATE_IDLE;
return NRF_SUCCESS;
}
ret_code_t nrf_drv_saadc_channel_init(uint8_t channel,
nrf_saadc_channel_config_t const * const p_config)
{
ASSERT(m_cb.state != NRF_DRV_STATE_UNINITIALIZED);
ASSERT(channel < NRF_SAADC_CHANNEL_COUNT);
// Oversampling can be used only with one channel.
ASSERT((nrf_saadc_oversample_get() == NRF_SAADC_OVERSAMPLE_DISABLED) ||
(m_cb.active_channels == 0));
ASSERT((p_config->pin_p <= NRF_SAADC_INPUT_VDD) &&
(p_config->pin_p > NRF_SAADC_INPUT_DISABLED));
ASSERT(p_config->pin_n <= NRF_SAADC_INPUT_VDD);
// A channel can only be initialized if the driver is in the idle state.
if (m_cb.adc_state != NRF_SAADC_STATE_IDLE)
{
return NRF_ERROR_BUSY;
}
if (!m_cb.psel[channel].pselp)
{
++m_cb.active_channels;
}
m_cb.psel[channel].pselp = p_config->pin_p;
m_cb.psel[channel].pseln = p_config->pin_n;
nrf_saadc_channel_init(channel, p_config);
nrf_saadc_channel_input_set(channel, p_config->pin_p, p_config->pin_n);
return NRF_SUCCESS;
}
ret_code_t nrf_drv_saadc_channel_uninit(uint8_t channel)
{
ASSERT(channel <= NRF_SAADC_CHANNEL_COUNT)
ASSERT(m_cb.state != NRF_DRV_STATE_UNINITIALIZED);
// A channel can only be uninitialized if the driver is in the idle state.
if (m_cb.adc_state == NRF_SAADC_STATE_BUSY)
{
return NRF_ERROR_BUSY;
}
if (input_is_ain(m_cb.psel[channel].pselp))
{
ain_set_allocated(ain_number(m_cb.psel[channel].pselp), false);
}
if (input_is_ain(m_cb.psel[channel].pseln))
{
ain_set_allocated(ain_number(m_cb.psel[channel].pseln), false);
}
if (m_cb.psel[channel].pselp)
{
--m_cb.active_channels;
}
m_cb.psel[channel].pselp = NRF_SAADC_INPUT_DISABLED;
m_cb.psel[channel].pseln = NRF_SAADC_INPUT_DISABLED;
nrf_saadc_channel_input_set(channel, NRF_SAADC_INPUT_DISABLED, NRF_SAADC_INPUT_DISABLED);
nrf_drv_saadc_limit_set(channel, NRF_DRV_SAADC_LIMITL_DISABLED, NRF_DRV_SAADC_LIMITH_DISABLED);
return NRF_SUCCESS;
}
ret_code_t nrf_drv_csense_sample(void)
{
ASSERT(m_csense.module_state == NRF_DRV_STATE_POWERED_ON);
if(m_csense.adc_channels_input_mask != 0)
{
if(m_csense.channels_to_read == 0)
{
#if USE_COMP == 0 && defined(SAADC_PRESENT)
nrf_saadc_enable();
#endif
if(nrf_drv_csense_is_busy() == true)
{
return NRF_ERROR_BUSY;
}
m_csense.busy = true;
m_csense.channels_to_read = m_csense.adc_channels_input_mask;
calculate_next_channel();
}
#if USE_COMP
if (!m_csense.timers_powered_on)
{
nrf_drv_timer_enable(&m_timer0);
nrf_drv_timer_enable(&m_timer1);
m_csense.timers_powered_on = true;
}
else
{
nrf_drv_timer_resume(&m_timer0);
nrf_drv_timer_resume(&m_timer1);
}
nrf_drv_comp_pin_select((nrf_comp_input_t)m_csense.cur_chann_idx);
nrf_drv_comp_start(0, 0);
#else
ret_code_t err_code;
#ifdef ADC_PRESENT
adc_channel.config.config.ain = (nrf_adc_config_input_t)(1<<m_csense.cur_chann_idx);
nrf_gpio_pin_clear(m_csense.output_pin);
err_code = nrf_drv_adc_sample_convert(&adc_channel, NULL);
#elif defined(SAADC_PRESENT)
saadc_channel.pin_p = (nrf_saadc_input_t)(m_csense.cur_chann_idx + 1);
nrf_saadc_channel_input_set(0, saadc_channel.pin_p, NRF_SAADC_INPUT_DISABLED);
nrf_gpio_pin_clear(m_csense.output_pin);
err_code = nrf_drv_saadc_sample();
#endif //ADC_PRESENT
if(err_code != NRF_SUCCESS)
{
return err_code;
}
#endif //USE_COMP
}
return NRF_SUCCESS;
}
ret_code_t nrf_drv_saadc_buffer_convert(nrf_saadc_value_t * p_buffer, uint16_t size)
{
ASSERT(m_cb.state != NRF_DRV_STATE_UNINITIALIZED);
nrf_saadc_int_disable(NRF_SAADC_INT_END);
if (m_cb.adc_state == NRF_SAADC_STATE_BUSY)
{
if ( m_cb.p_secondary_buffer)
{
nrf_saadc_int_enable(NRF_SAADC_INT_END);
return NRF_ERROR_BUSY;
}
else
{
m_cb.p_secondary_buffer = p_buffer;
m_cb.secondary_buffer_size = size;
if (m_cb.active_channels == 1)
{
while (nrf_saadc_event_check(NRF_SAADC_EVENT_STARTED) == 0);
nrf_saadc_event_clear(NRF_SAADC_EVENT_STARTED);
nrf_saadc_buffer_init(p_buffer, size);
}
nrf_saadc_int_enable(NRF_SAADC_INT_END);
return NRF_SUCCESS;
}
}
nrf_saadc_int_enable(NRF_SAADC_INT_END);
m_cb.adc_state = NRF_SAADC_STATE_BUSY;
m_cb.scan_pos = NRF_SAADC_CHANNEL_COUNT;
for (uint8_t i = 0; i < NRF_SAADC_CHANNEL_COUNT; ++i)
{
if (m_cb.psel[i].pselp)
{
m_cb.scan_pos = i;
break;
}
}
// Find the first enabled channel.
if (m_cb.scan_pos >= NRF_SAADC_CHANNEL_COUNT)
{
return NRF_ERROR_INVALID_STATE;
}
m_cb.buffer = p_buffer;
m_cb.buffer_size = size;
m_cb.buffer_pos = 0;
m_cb.p_secondary_buffer = NULL;
nrf_saadc_channel_input_set(m_cb.scan_pos,
m_cb.psel[m_cb.scan_pos].pselp, m_cb.psel[m_cb.scan_pos].pseln);
if (m_cb.active_channels == 1)
{
nrf_saadc_buffer_init(p_buffer, size);
}
else
{
nrf_saadc_buffer_init(p_buffer, 1);
}
nrf_saadc_event_clear(NRF_SAADC_EVENT_STARTED);
nrf_saadc_task_trigger(NRF_SAADC_TASK_START);
return NRF_SUCCESS;
}
void SAADC_IRQHandler(void)
{
if (nrf_saadc_event_check(NRF_SAADC_EVENT_END))
{
nrf_saadc_event_clear(NRF_SAADC_EVENT_END);
if (m_cb.active_channels == 1)
{
nrf_drv_saadc_evt_t evt;
evt.type = NRF_DRV_SAADC_EVT_DONE;
evt.data.done.p_buffer = (nrf_saadc_value_t *)m_cb.buffer;
evt.data.done.size = m_cb.buffer_size;
if (m_cb.p_secondary_buffer == NULL)
{
m_cb.adc_state = NRF_SAADC_STATE_IDLE;
}
else
{
m_cb.buffer = m_cb.p_secondary_buffer;
m_cb.buffer_size = m_cb.secondary_buffer_size;
m_cb.p_secondary_buffer = NULL;
nrf_saadc_task_trigger(NRF_SAADC_TASK_START);
}
m_cb.event_handler(&evt);
}
else
{
//PAN-28: scan mode is not working correctly, emulated by interrupts
m_cb.buffer_pos++;
uint16_t buffer_pos = m_cb.buffer_pos;
if (buffer_pos == m_cb.buffer_size)
{
nrf_drv_saadc_evt_t evt;
evt.type = NRF_DRV_SAADC_EVT_DONE;
evt.data.done.p_buffer = (nrf_saadc_value_t *)m_cb.buffer;
evt.data.done.size = m_cb.buffer_size;
m_cb.adc_state = NRF_SAADC_STATE_IDLE;
if (m_cb.p_secondary_buffer == NULL)
{
m_cb.adc_state = NRF_SAADC_STATE_IDLE;
}
else
{
(void)nrf_drv_saadc_buffer_convert((nrf_saadc_value_t *)m_cb.p_secondary_buffer, (uint16_t)m_cb.secondary_buffer_size);
}
m_cb.event_handler(&evt);
}
else
{
//
uint8_t current_scan_pos = m_cb.scan_pos;
nrf_saadc_channel_input_set(current_scan_pos,
NRF_SAADC_INPUT_DISABLED, NRF_SAADC_INPUT_DISABLED);
nrf_saadc_buffer_init((nrf_saadc_value_t *)(m_cb.buffer + m_cb.buffer_pos), 1);
// Find the next enabled channel.
for (++m_cb.scan_pos; m_cb.scan_pos < NRF_SAADC_CHANNEL_COUNT; ++m_cb.scan_pos)
{
if (m_cb.psel[m_cb.scan_pos].pselp)
{
nrf_saadc_channel_input_set(m_cb.scan_pos,
m_cb.psel[m_cb.scan_pos].pselp, m_cb.psel[m_cb.scan_pos].pseln);
nrf_saadc_task_trigger(NRF_SAADC_TASK_START);
nrf_saadc_task_trigger(NRF_SAADC_TASK_SAMPLE);
return;
}
}
//if scanning is done prepare for next round.
for (uint8_t i = 0; i < NRF_SAADC_CHANNEL_COUNT; ++i)
{
if (m_cb.psel[i].pselp)
{
m_cb.scan_pos = i;
break;
}
}
nrf_saadc_channel_input_set(m_cb.scan_pos,
m_cb.psel[m_cb.scan_pos].pselp, m_cb.psel[m_cb.scan_pos].pseln);
nrf_saadc_task_trigger(NRF_SAADC_TASK_START);
}
}
}
if (nrf_saadc_event_check(NRF_SAADC_EVENT_STOPPED))
{
nrf_saadc_event_clear(NRF_SAADC_EVENT_STOPPED);
m_cb.adc_state = NRF_SAADC_STATE_IDLE;
}
else
{
uint32_t limit_flags = m_cb.limits_enabled_flags;
uint32_t flag_idx;
nrf_saadc_event_t event;
while (limit_flags)
{
flag_idx = __CLZ(limit_flags);
limit_flags &= ~(0x80000000 >> flag_idx);
event = FLAG_IDX_TO_EVENT(flag_idx);
if (nrf_saadc_event_check(event))
{
nrf_saadc_event_clear(event);
nrf_drv_saadc_evt_t evt;
evt.type = NRF_DRV_SAADC_EVT_LIMIT;
evt.data.limit.channel = LIMIT_EVENT_TO_CHANNEL(event);
evt.data.limit.limit_type = LIMIT_EVENT_TO_LIMIT_TYPE(event);
m_cb.event_handler(&evt);
}
}
}
}