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https://github.com/espressif/esp-idf.git
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c0601e512b
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
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
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* SPDX-FileCopyrightText: 2022-2026 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "sdkconfig.h"
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#include "ulp_adc.h"
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#include "esp_err.h"
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#include "esp_check.h"
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#include "esp_log.h"
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#include "esp_adc/adc_oneshot.h"
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#include "hal/adc_hal_common.h"
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#include "esp_private/esp_sleep_internal.h"
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#include "esp_private/adc_share_hw_ctrl.h"
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static const char *TAG = "ulp_adc";
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static adc_oneshot_unit_handle_t s_adc_handle = NULL;
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esp_err_t ulp_adc_config_channel(adc_unit_t adc_n, adc_channel_t channel, const ulp_adc_chan_cfg_t *chan_cfg)
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{
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esp_err_t ret = ESP_OK;
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ESP_RETURN_ON_FALSE(chan_cfg, ESP_ERR_INVALID_ARG, TAG, "chan_cfg == NULL");
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ESP_RETURN_ON_FALSE(s_adc_handle, ESP_ERR_INVALID_STATE, TAG, "ADC unit not initialized");
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//-------------ADC Config---------------//
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ret = adc_oneshot_config_channel(s_adc_handle, channel, chan_cfg);
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if (ret != ESP_OK) {
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return ret;
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}
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//Calibrate the ADC
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#if SOC_ADC_CALIBRATION_V1_SUPPORTED
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adc_set_hw_calibration_code(adc_n, chan_cfg->atten);
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#endif
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return ret;
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}
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esp_err_t ulp_adc_init(const ulp_adc_cfg_t *cfg)
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{
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esp_err_t ret = ESP_OK;
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ESP_RETURN_ON_FALSE(cfg, ESP_ERR_INVALID_ARG, TAG, "cfg == NULL");
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//-------------ADC1 Init---------------//
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adc_oneshot_unit_init_cfg_t init_config = {
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.unit_id = cfg->adc_n,
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.ulp_mode = cfg->ulp_mode,
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};
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if (init_config.ulp_mode == ADC_ULP_MODE_DISABLE) {
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/* Default to RISCV for backward compatibility */
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ESP_LOGI(TAG, "No ulp mode specified in cfg struct, default to riscv");
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init_config.ulp_mode = ADC_ULP_MODE_RISCV;
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}
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ret = adc_oneshot_new_unit(&init_config, &s_adc_handle);
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if (ret != ESP_OK) {
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return ret;
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}
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//-------------ADC Config---------------//
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adc_oneshot_chan_cfg_t config = {
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.bitwidth = cfg->width,
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.atten = cfg->atten,
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};
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ret = adc_oneshot_config_channel(s_adc_handle, cfg->channel, &config);
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if (ret != ESP_OK) {
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adc_oneshot_del_unit(s_adc_handle);
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s_adc_handle = NULL;
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return ret;
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}
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//Calibrate the ADC
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#if SOC_ADC_CALIBRATION_V1_SUPPORTED
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adc_set_hw_calibration_code(cfg->adc_n, cfg->atten);
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#endif
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return ret;
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}
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esp_err_t ulp_adc_deinit(void)
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{
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// No need to check for null-pointer and stuff, oneshot driver already does that
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return adc_oneshot_del_unit(s_adc_handle);
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}
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