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zephyr/drivers/adc/adc_nrfx_saadc.c
Andrzej Głąbek b1d5eed262 drivers: nrfx: Update implementations after switching to nrfx 2.0.0 
Update calls to nrfx HAL functions to reflect API changes introduced in
nrfx 2.0.0. All these functions are now called with the first parameter
pointing to the structure of registers of the relevant peripheral.
Also a few functions got renamed:
- nrf_gpiote_int_is_enabled to nrf_gpiote_int_enable_check
- nrf_gpiote_event_is_set to nrf_gpiote_event_check
- nrf_rng_event_get to nrf_rng_event_check
- nrf_rng_int_get to nrf_rng_int_enable_check
- nrf_rtc_event_pending to nrf_rtc_event_check
- nrf_rtc_int_is_enabled to nrf_rtc_int_enable_check
- nrf_timer_cc_read to nrf_timer_cc_get
- nrf_timer_cc_write to nrf_timer_cc_set

Default configuration values were removed from nrfx_config files,
so the drivers pwm_nrfx and spi_nrfx_spis no longer can use those.

Function nrfx_pwm_init() now takes one more parameter - context pointer
that is passed to the event handler, not used in the pwm_nrfx driver.

HALs for UART and UARTE now allow configuration of the parity type
and the number of stop bits, for SoCs that provide the corresponding
registers.

Signed-off-by: Karol Lasończyk <karol.lasonczyk@nordicsemi.no>
Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
2019-11-08 14:54:12 +01:00

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/*
* Copyright (c) 2018 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#define ADC_CONTEXT_USES_KERNEL_TIMER
#include "adc_context.h"
#include <hal/nrf_saadc.h>
#define LOG_LEVEL CONFIG_ADC_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(adc_nrfx_saadc);
struct driver_data {
struct adc_context ctx;
u8_t positive_inputs[SAADC_CH_NUM];
};
static struct driver_data m_data = {
ADC_CONTEXT_INIT_TIMER(m_data, ctx),
ADC_CONTEXT_INIT_LOCK(m_data, ctx),
ADC_CONTEXT_INIT_SYNC(m_data, ctx),
};
/* Implementation of the ADC driver API function: adc_channel_setup. */
static int adc_nrfx_channel_setup(struct device *dev,
const struct adc_channel_cfg *channel_cfg)
{
nrf_saadc_channel_config_t config = {
.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
.resistor_n = NRF_SAADC_RESISTOR_DISABLED,
.burst = NRF_SAADC_BURST_DISABLED,
};
u8_t channel_id = channel_cfg->channel_id;
if (channel_id >= SAADC_CH_NUM) {
return -EINVAL;
}
switch (channel_cfg->gain) {
case ADC_GAIN_1_6:
config.gain = NRF_SAADC_GAIN1_6;
break;
case ADC_GAIN_1_5:
config.gain = NRF_SAADC_GAIN1_5;
break;
case ADC_GAIN_1_4:
config.gain = NRF_SAADC_GAIN1_4;
break;
case ADC_GAIN_1_3:
config.gain = NRF_SAADC_GAIN1_3;
break;
case ADC_GAIN_1_2:
config.gain = NRF_SAADC_GAIN1_2;
break;
case ADC_GAIN_1:
config.gain = NRF_SAADC_GAIN1;
break;
case ADC_GAIN_2:
config.gain = NRF_SAADC_GAIN2;
break;
case ADC_GAIN_4:
config.gain = NRF_SAADC_GAIN4;
break;
default:
LOG_ERR("Selected ADC gain is not valid");
return -EINVAL;
}
switch (channel_cfg->reference) {
case ADC_REF_INTERNAL:
config.reference = NRF_SAADC_REFERENCE_INTERNAL;
break;
case ADC_REF_VDD_1_4:
config.reference = NRF_SAADC_REFERENCE_VDD4;
break;
default:
LOG_ERR("Selected ADC reference is not valid");
return -EINVAL;
}
switch (channel_cfg->acquisition_time) {
case ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 3):
config.acq_time = NRF_SAADC_ACQTIME_3US;
break;
case ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 5):
config.acq_time = NRF_SAADC_ACQTIME_5US;
break;
case ADC_ACQ_TIME_DEFAULT:
case ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 10):
config.acq_time = NRF_SAADC_ACQTIME_10US;
break;
case ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 15):
config.acq_time = NRF_SAADC_ACQTIME_15US;
break;
case ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 20):
config.acq_time = NRF_SAADC_ACQTIME_20US;
break;
case ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 40):
config.acq_time = NRF_SAADC_ACQTIME_40US;
break;
default:
LOG_ERR("Selected ADC acquisition time is not valid");
return -EINVAL;
}
config.mode = (channel_cfg->differential ?
NRF_SAADC_MODE_DIFFERENTIAL : NRF_SAADC_MODE_SINGLE_ENDED);
/* 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_init(NRF_SAADC, channel_id, &config);
nrf_saadc_channel_input_set(NRF_SAADC,
channel_id,
NRF_SAADC_INPUT_DISABLED,
channel_cfg->input_negative);
/* 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] = channel_cfg->input_positive;
return 0;
}
static void adc_context_start_sampling(struct adc_context *ctx)
{
nrf_saadc_enable(NRF_SAADC);
if (ctx->sequence.calibrate) {
nrf_saadc_task_trigger(NRF_SAADC,
NRF_SAADC_TASK_CALIBRATEOFFSET);
} else {
nrf_saadc_task_trigger(NRF_SAADC, NRF_SAADC_TASK_START);
nrf_saadc_task_trigger(NRF_SAADC, NRF_SAADC_TASK_SAMPLE);
}
}
static void adc_context_update_buffer_pointer(struct adc_context *ctx,
bool repeat)
{
ARG_UNUSED(ctx);
if (!repeat) {
nrf_saadc_buffer_pointer_set(
NRF_SAADC,
nrf_saadc_buffer_pointer_get(NRF_SAADC) +
nrf_saadc_amount_get(NRF_SAADC));
}
}
static int set_resolution(const struct adc_sequence *sequence)
{
nrf_saadc_resolution_t nrf_resolution;
switch (sequence->resolution) {
case 8:
nrf_resolution = NRF_SAADC_RESOLUTION_8BIT;
break;
case 10:
nrf_resolution = NRF_SAADC_RESOLUTION_10BIT;
break;
case 12:
nrf_resolution = NRF_SAADC_RESOLUTION_12BIT;
break;
case 14:
nrf_resolution = NRF_SAADC_RESOLUTION_14BIT;
break;
default:
LOG_ERR("ADC resolution value %d is not valid",
sequence->resolution);
return -EINVAL;
}
nrf_saadc_resolution_set(NRF_SAADC, nrf_resolution);
return 0;
}
static int set_oversampling(const struct adc_sequence *sequence,
u8_t active_channels)
{
nrf_saadc_oversample_t nrf_oversampling;
if ((active_channels > 1) && (sequence->oversampling > 0)) {
LOG_ERR(
"Oversampling is supported for single channel only");
return -EINVAL;
}
switch (sequence->oversampling) {
case 0:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_DISABLED;
break;
case 1:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_2X;
break;
case 2:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_4X;
break;
case 3:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_8X;
break;
case 4:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_16X;
break;
case 5:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_32X;
break;
case 6:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_64X;
break;
case 7:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_128X;
break;
case 8:
nrf_oversampling = NRF_SAADC_OVERSAMPLE_256X;
break;
default:
LOG_ERR("Oversampling value %d is not valid",
sequence->oversampling);
return -EINVAL;
}
nrf_saadc_oversample_set(NRF_SAADC, nrf_oversampling);
return 0;
}
static int check_buffer_size(const struct adc_sequence *sequence,
u8_t active_channels)
{
size_t needed_buffer_size;
needed_buffer_size = active_channels * sizeof(nrf_saadc_value_t);
if (sequence->options) {
needed_buffer_size *= (1 + sequence->options->extra_samplings);
}
if (sequence->buffer_size < needed_buffer_size) {
LOG_ERR("Provided buffer is too small (%u/%u)",
sequence->buffer_size, needed_buffer_size);
return -ENOMEM;
}
return 0;
}
static int start_read(struct device *dev, const struct adc_sequence *sequence)
{
int error;
u32_t selected_channels = sequence->channels;
u8_t active_channels;
u8_t channel_id;
/* Signal an error if channel selection is invalid (no channels or
* a non-existing one is selected).
*/
if (!selected_channels ||
(selected_channels & ~BIT_MASK(SAADC_CH_NUM))) {
LOG_ERR("Invalid selection of channels");
return -EINVAL;
}
active_channels = 0U;
/* Enable only the channels selected for the pointed sequence.
* Disable all the rest.
*/
channel_id = 0U;
do {
if (selected_channels & BIT(channel_id)) {
/* Signal an error if a selected channel has not been
* configured yet.
*/
if (m_data.positive_inputs[channel_id] == 0U) {
LOG_ERR("Channel %u not configured",
channel_id);
return -EINVAL;
}
/* When oversampling is used, the burst mode needs to
* be activated. Unfortunately, this mode cannot be
* activated permanently in the channel setup, because
* then the multiple channel sampling fails (the END
* event is not generated) after switching to a single
* channel sampling and back. Thus, when oversampling
* is not used (hence, the multiple channel sampling is
* possible), the burst mode have to be deactivated.
*/
nrf_saadc_burst_set(NRF_SAADC, channel_id,
(sequence->oversampling != 0U ?
NRF_SAADC_BURST_ENABLED :
NRF_SAADC_BURST_DISABLED));
nrf_saadc_channel_pos_input_set(
NRF_SAADC,
channel_id,
m_data.positive_inputs[channel_id]);
++active_channels;
} else {
nrf_saadc_channel_pos_input_set(
NRF_SAADC,
channel_id,
NRF_SAADC_INPUT_DISABLED);
}
} while (++channel_id < SAADC_CH_NUM);
error = set_resolution(sequence);
if (error) {
return error;
}
error = set_oversampling(sequence, active_channels);
if (error) {
return error;
}
error = check_buffer_size(sequence, active_channels);
if (error) {
return error;
}
nrf_saadc_buffer_init(NRF_SAADC,
(nrf_saadc_value_t *)sequence->buffer,
active_channels);
adc_context_start_read(&m_data.ctx, sequence);
error = adc_context_wait_for_completion(&m_data.ctx);
return error;
}
/* Implementation of the ADC driver API function: adc_read. */
static int adc_nrfx_read(struct device *dev,
const struct adc_sequence *sequence)
{
int error;
adc_context_lock(&m_data.ctx, false, NULL);
error = start_read(dev, sequence);
adc_context_release(&m_data.ctx, error);
return error;
}
#ifdef CONFIG_ADC_ASYNC
/* Implementation of the ADC driver API function: adc_read_async. */
static int adc_nrfx_read_async(struct device *dev,
const struct adc_sequence *sequence,
struct k_poll_signal *async)
{
int error;
adc_context_lock(&m_data.ctx, true, async);
error = start_read(dev, sequence);
adc_context_release(&m_data.ctx, error);
return error;
}
#endif /* CONFIG_ADC_ASYNC */
static void saadc_irq_handler(void *param)
{
struct device *dev = (struct device *)param;
if (nrf_saadc_event_check(NRF_SAADC, NRF_SAADC_EVENT_END)) {
nrf_saadc_event_clear(NRF_SAADC, NRF_SAADC_EVENT_END);
nrf_saadc_task_trigger(NRF_SAADC, NRF_SAADC_TASK_STOP);
nrf_saadc_disable(NRF_SAADC);
adc_context_on_sampling_done(&m_data.ctx, dev);
} else if (nrf_saadc_event_check(NRF_SAADC,
NRF_SAADC_EVENT_CALIBRATEDONE)) {
nrf_saadc_event_clear(NRF_SAADC, NRF_SAADC_EVENT_CALIBRATEDONE);
/*
* The workaround for Nordic nRF52832 anomalies 86 and
* 178 is an explicit STOP after CALIBRATEOFFSET
* before issuing START.
*/
nrf_saadc_task_trigger(NRF_SAADC, NRF_SAADC_TASK_STOP);
nrf_saadc_task_trigger(NRF_SAADC, NRF_SAADC_TASK_START);
nrf_saadc_task_trigger(NRF_SAADC, NRF_SAADC_TASK_SAMPLE);
}
}
DEVICE_DECLARE(adc_0);
static int init_saadc(struct device *dev)
{
nrf_saadc_event_clear(NRF_SAADC, NRF_SAADC_EVENT_END);
nrf_saadc_event_clear(NRF_SAADC, NRF_SAADC_EVENT_CALIBRATEDONE);
nrf_saadc_int_enable(NRF_SAADC,
NRF_SAADC_INT_END | NRF_SAADC_INT_CALIBRATEDONE);
NRFX_IRQ_ENABLE(DT_NORDIC_NRF_SAADC_ADC_0_IRQ_0);
IRQ_CONNECT(DT_NORDIC_NRF_SAADC_ADC_0_IRQ_0,
DT_NORDIC_NRF_SAADC_ADC_0_IRQ_0_PRIORITY,
saadc_irq_handler, DEVICE_GET(adc_0), 0);
adc_context_unlock_unconditionally(&m_data.ctx);
return 0;
}
static const struct adc_driver_api adc_nrfx_driver_api = {
.channel_setup = adc_nrfx_channel_setup,
.read = adc_nrfx_read,
#ifdef CONFIG_ADC_ASYNC
.read_async = adc_nrfx_read_async,
#endif
.ref_internal = 600,
};
#ifdef CONFIG_ADC_0
DEVICE_AND_API_INIT(adc_0, DT_NORDIC_NRF_SAADC_ADC_0_LABEL,
init_saadc, NULL, NULL,
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&adc_nrfx_driver_api);
#endif /* CONFIG_ADC_0 */
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