4  * SPDX-License-Identifier: Apache-2.0
30  * for ESP32-S2 is doing it, so we copy that approach in Zephyr driver
51 /* Convert resolution in bits to esp32 enum values */
52 #define WIDTH_MASK(r) ((((r) - 9) < ADC_WIDTH_MAX) ? ((r) - 9) : (ADC_WIDTH_MAX - 1))
76 /* Convert zephyr,gain property to the ESP32 attenuation */
93 		return -ENOTSUP;  in gain_to_atten()
122 	struct adc_esp32_data *data = dev->data;  in adc_calibration_init()
126 		LOG_WRN("Skip software calibration - Not supported!");  in adc_calibration_init()
129 		LOG_WRN("Skip software calibration - Invalid version!");  in adc_calibration_init()
143 	const struct adc_esp32_conf *conf = dev->config;  in adc_esp32_read()
144 	struct adc_esp32_data *data = dev->data;  in adc_esp32_read()
148 	uint8_t channel_id = find_lsb_set(seq->channels) - 1;  in adc_esp32_read()
150 	if (seq->buffer_size < 2) {  in adc_esp32_read()
151 		LOG_ERR("Sequence buffer space too low '%d'", seq->buffer_size);  in adc_esp32_read()
152 		return -ENOMEM;  in adc_esp32_read()
155 	if (seq->channels > BIT(channel_id)) {  in adc_esp32_read()
156 		LOG_ERR("Multi-channel readings not supported");  in adc_esp32_read()
157 		return -ENOTSUP;  in adc_esp32_read()
160 	if (seq->options) {  in adc_esp32_read()
161 		if (seq->options->extra_samplings) {  in adc_esp32_read()
163 			return -ENOTSUP;  in adc_esp32_read()
166 		if (seq->options->interval_us) {  in adc_esp32_read()
168 			return -ENOTSUP;  in adc_esp32_read()
172 	if (INVALID_RESOLUTION(seq->resolution)) {  in adc_esp32_read()
173 		LOG_ERR("unsupported resolution (%d)", seq->resolution);  in adc_esp32_read()
174 		return -ENOTSUP;  in adc_esp32_read()
177 	if (seq->calibrate) {  in adc_esp32_read()
180 		return -ENOTSUP;  in adc_esp32_read()
183 	data->resolution[channel_id] = seq->resolution;  in adc_esp32_read()
187 	if (conf->unit == ADC_UNIT_1) {  in adc_esp32_read()
191 	adc_set_data_width(conf->unit, WIDTH_MASK(data->resolution[channel_id]));  in adc_esp32_read()
195 	if (conf->unit == ADC_UNIT_1) {  in adc_esp32_read()
198 	if (conf->unit == ADC_UNIT_2) {  in adc_esp32_read()
200 			LOG_ERR("Conversion timeout on '%s' channel %d", dev->name, channel_id);  in adc_esp32_read()
201 			return -ETIMEDOUT;  in adc_esp32_read()
206 	if (data->calibrate) {  in adc_esp32_read()
207 		data->chars[channel_id].bit_width = WIDTH_MASK(data->resolution[channel_id]);  in adc_esp32_read()
209 		cal = cal_mv = esp_adc_cal_raw_to_voltage(reading, &data->chars[channel_id]);  in adc_esp32_read()
212 		if (data->attenuation[channel_id] == ADC_ATTEN_DB_11) {  in adc_esp32_read()
220 		atten_to_gain(data->attenuation[channel_id], &cal);  in adc_esp32_read()
221 		if (data->meas_ref_internal > 0) {  in adc_esp32_read()
222 			cal = (cal << data->resolution[channel_id]) / data->meas_ref_internal;  in adc_esp32_read()
231 	data->buffer = (uint16_t *) seq->buffer;  in adc_esp32_read()
232 	data->buffer[0] = cal;  in adc_esp32_read()
246 	return -ENOTSUP;  in adc_esp32_read_async()
252 	const struct adc_esp32_conf *conf = (const struct adc_esp32_conf *)dev->config;  in adc_esp32_channel_setup()
253 	struct adc_esp32_data *data = (struct adc_esp32_data *) dev->data;  in adc_esp32_channel_setup()
256 	if (cfg->channel_id >= conf->channel_count) {  in adc_esp32_channel_setup()
257 		LOG_ERR("Unsupported channel id '%d'", cfg->channel_id);  in adc_esp32_channel_setup()
258 		return -ENOTSUP;  in adc_esp32_channel_setup()
261 	if (cfg->reference != ADC_REF_INTERNAL) {  in adc_esp32_channel_setup()
262 		LOG_ERR("Unsupported channel reference '%d'", cfg->reference);  in adc_esp32_channel_setup()
263 		return -ENOTSUP;  in adc_esp32_channel_setup()
266 	if (cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {  in adc_esp32_channel_setup()
267 		LOG_ERR("Unsupported acquisition_time '%d'", cfg->acquisition_time);  in adc_esp32_channel_setup()
268 		return -ENOTSUP;  in adc_esp32_channel_setup()
271 	if (cfg->differential) {  in adc_esp32_channel_setup()
273 		return -ENOTSUP;  in adc_esp32_channel_setup()
276 	if (gain_to_atten(cfg->gain, &data->attenuation[cfg->channel_id])) {  in adc_esp32_channel_setup()
277 		LOG_ERR("Unsupported gain value '%d'", cfg->gain);  in adc_esp32_channel_setup()
278 		return -ENOTSUP;  in adc_esp32_channel_setup()
282 	if (conf->unit == ADC_UNIT_1) {  in adc_esp32_channel_setup()
283 		adc1_config_channel_atten(cfg->channel_id, data->attenuation[cfg->channel_id]);  in adc_esp32_channel_setup()
285 	if (conf->unit == ADC_UNIT_2) {  in adc_esp32_channel_setup()
286 		adc2_config_channel_atten(cfg->channel_id, data->attenuation[cfg->channel_id]);  in adc_esp32_channel_setup()
289 	if (data->calibrate) {  in adc_esp32_channel_setup()
290 		esp_adc_cal_value_t cal = esp_adc_cal_characterize(conf->unit,  in adc_esp32_channel_setup()
291 						data->attenuation[cfg->channel_id],  in adc_esp32_channel_setup()
292 						WIDTH_MASK(data->resolution[cfg->channel_id]),  in adc_esp32_channel_setup()
293 						data->meas_ref_internal,  in adc_esp32_channel_setup()
294 						&data->chars[cfg->channel_id]);  in adc_esp32_channel_setup()
297 			return -EIO;  in adc_esp32_channel_setup()
307 	struct adc_esp32_data *data = (struct adc_esp32_data *) dev->data;  in adc_esp32_init()
309 	for (uint8_t i = 0; i < ARRAY_SIZE(data->resolution); i++) {  in adc_esp32_init()
310 		data->resolution[i] = ADC_RESOLUTION_MAX;  in adc_esp32_init()
312 	for (uint8_t i = 0; i < ARRAY_SIZE(data->attenuation); i++) {  in adc_esp32_init()
313 		data->attenuation[i] = ADC_ATTEN_DB_0;  in adc_esp32_init()
317 	data->meas_ref_internal = ADC_ESP32_DEFAULT_VREF_INTERNAL;  in adc_esp32_init()
320 	data->calibrate = adc_calibration_init(dev);  in adc_esp32_init()