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feat(ulp): add multi-channel ADC init for ULP

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ulp_adc_init() could only configure a single ADC channel, so monitoring
several channels from the ULP on one ADC unit was not possible. Add
ulp_adc_multi_channel_init() to configure multiple channels with
per-channel attenuation while keeping the existing single-channel API
unchanged.

Closes https://github.com/espressif/esp-idf/issues/11160
This commit is contained in:
Meet Patel
2026-06-16 12:50:58 +05:30
parent 8e8ebae7bd
commit c0601e512b
3 changed files with 76 additions and 2 deletions
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components/ulp/ulp_common/ulp_adc.c
+24 -1
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2022-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -17,6 +17,27 @@
static const char *TAG = "ulp_adc";
static adc_oneshot_unit_handle_t s_adc_handle = NULL;
esp_err_t ulp_adc_config_channel(adc_unit_t adc_n, adc_channel_t channel, const ulp_adc_chan_cfg_t *chan_cfg)
{
esp_err_t ret = ESP_OK;
ESP_RETURN_ON_FALSE(chan_cfg, ESP_ERR_INVALID_ARG, TAG, "chan_cfg == NULL");
ESP_RETURN_ON_FALSE(s_adc_handle, ESP_ERR_INVALID_STATE, TAG, "ADC unit not initialized");
//-------------ADC Config---------------//
ret = adc_oneshot_config_channel(s_adc_handle, channel, chan_cfg);
if (ret != ESP_OK) {
return ret;
}
//Calibrate the ADC
#if SOC_ADC_CALIBRATION_V1_SUPPORTED
adc_set_hw_calibration_code(adc_n, chan_cfg->atten);
#endif
return ret;
}
esp_err_t ulp_adc_init(const ulp_adc_cfg_t *cfg)
{
esp_err_t ret = ESP_OK;
@@ -47,6 +68,8 @@ esp_err_t ulp_adc_init(const ulp_adc_cfg_t *cfg)
};
ret = adc_oneshot_config_channel(s_adc_handle, cfg->channel, &config);
if (ret != ESP_OK) {
adc_oneshot_del_unit(s_adc_handle);
s_adc_handle = NULL;
return ret;
}