esp_adc: new esp_adc component and adc drivers

components/esp_adc/include/esp_private/adc2_wifi.h

@@ -0,0 +1,59 @@
+/*
+ * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "sdkconfig.h"
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * @brief For WIFI module to claim the usage of ADC2.
+ *
+ * Other tasks will be forbidden to use ADC2 between ``adc2_wifi_acquire`` and ``adc2_wifi_release``.
+ * The WIFI module may have to wait for a short time for the current conversion (if exist) to finish.
+ *
+ * @return
+ *        - ESP_OK success
+ *        - ESP_ERR_TIMEOUT reserved for future use. Currently the function will wait until success.
+ */
+esp_err_t adc2_wifi_acquire(void);
+
+/**
+ * @brief For WIFI module to let other tasks use the ADC2 when WIFI is not work.
+ *
+ * Other tasks will be forbidden to use ADC2 between ``adc2_wifi_acquire`` and ``adc2_wifi_release``.
+ * Call this function to release the occupation of ADC2 by WIFI.
+ *
+ * @return
+ *        - ESP_OK:                On success
+ *        - ESP_ERR_INVALID_STATE: The lock(s) isn't acquired yet
+ */
+esp_err_t adc2_wifi_release(void);
+
+#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32C3
+/**
+ * @brief This API help ADC2 calibration constructor be linked.
+ *
+ * @note  This is a private function, Don't call `adc2_cal_include` in user code.
+ */
+void adc2_cal_include(void);
+#else
+/**
+ * @brief There's no calibration involved on this chip.
+ *
+ * @note  This is a private function, Don't call `adc2_cal_include` in user code.
+ */
+#define adc2_cal_include()
+#endif //CONFIG_IDF_TARGET_*
+
+#ifdef __cplusplus
+}
+#endif