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drivers: adc: nrf: add support for nrf54l internal SAADC inputs 

SAADC peripheral for nRF54L Series allows to choose internal
voltages as positive inputs.

Signed-off-by: Nikodem Kastelik <nikodem.kastelik@nordicsemi.no>
This commit is contained in:
Nikodem Kastelik 2024-09-30 16:08:42 +02:00 committed by Henrik Brix Andersen
parent d494769948
commit ece7da5947
1 changed files with 16 additions and 12 deletions
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28
drivers/adc/adc_nrfx_saadc.c
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@ -32,7 +32,7 @@ static const uint8_t saadc_psels[NRF_SAADC_AIN7 + 1] = {
[NRF_SAADC_AIN7] = NRF_PIN_PORT_TO_PIN_NUMBER(7U, 1),
};
#elif defined(CONFIG_SOC_NRF54L15)
static const uint8_t saadc_psels[NRF_SAADC_AIN7 + 1] = {
static const uint32_t saadc_psels[NRF_SAADC_DVDD + 1] = {
[NRF_SAADC_AIN0] = NRF_PIN_PORT_TO_PIN_NUMBER(4U, 1),
[NRF_SAADC_AIN1] = NRF_PIN_PORT_TO_PIN_NUMBER(5U, 1),
[NRF_SAADC_AIN2] = NRF_PIN_PORT_TO_PIN_NUMBER(6U, 1),
@ -41,6 +41,9 @@ static const uint8_t saadc_psels[NRF_SAADC_AIN7 + 1] = {
[NRF_SAADC_AIN5] = NRF_PIN_PORT_TO_PIN_NUMBER(12U, 1),
[NRF_SAADC_AIN6] = NRF_PIN_PORT_TO_PIN_NUMBER(13U, 1),
[NRF_SAADC_AIN7] = NRF_PIN_PORT_TO_PIN_NUMBER(14U, 1),
[NRF_SAADC_VDD] = NRF_SAADC_INPUT_VDD,
[NRF_SAADC_AVDD] = NRF_SAADC_INPUT_AVDD,
[NRF_SAADC_DVDD] = NRF_SAADC_INPUT_DVDD,
};
#endif
@ -274,13 +277,8 @@ static int adc_nrfx_channel_setup(const struct device *dev,
m_data.single_ended_channels |= BIT(channel_cfg->channel_id);
}
/* Keep the channel disabled in hardware (set positive input to
* NRF_SAADC_INPUT_DISABLED) until it is selected to be included
* in a sampling sequence.
*/
#if (NRF_SAADC_HAS_AIN_AS_PIN)
if ((channel_cfg->input_positive > NRF_SAADC_AIN7) ||
if ((channel_cfg->input_positive >= ARRAY_SIZE(saadc_psels)) ||
(channel_cfg->input_positive < NRF_SAADC_AIN0)) {
return -EINVAL;
}
@ -295,17 +293,18 @@ static int adc_nrfx_channel_setup(const struct device *dev,
} else {
input_negative = NRF_SAADC_INPUT_DISABLED;
}
#endif
/* Store the positive input selection in a dedicated array,
* to get it later when the channel is selected for a sampling
* and to mark the channel as configured (ready to be selected).
*/
m_data.positive_inputs[channel_id] = saadc_psels[channel_cfg->input_positive];
#else
m_data.positive_inputs[channel_id] = channel_cfg->input_positive;
#endif
nrf_saadc_channel_init(NRF_SAADC, channel_id, &config);
/* Keep the channel disabled in hardware (set positive input to
* NRF_SAADC_INPUT_DISABLED) until it is selected to be included
* in a sampling sequence.
*/
nrf_saadc_channel_input_set(NRF_SAADC,
channel_id,
NRF_SAADC_INPUT_DISABLED,
@ -532,7 +531,12 @@ static int start_read(const struct device *dev,
nrf_saadc_channel_pos_input_set(
NRF_SAADC,
channel_id,
m_data.positive_inputs[channel_id]);
#if NRF_SAADC_HAS_AIN_AS_PIN
saadc_psels[m_data.positive_inputs[channel_id]]
#else
m_data.positive_inputs[channel_id]
#endif
);
++active_channels;
} else {
nrf_saadc_burst_set(