esp_adc: added adc digital filter feature

components/esp_adc/adc_continuous_internal.h

@@ -0,0 +1,87 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "sdkconfig.h"
+#include "esp_pm.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/ringbuf.h"
+#include "hal/adc_types.h"
+#include "hal/adc_hal.h"
+//For DMA
+#if SOC_GDMA_SUPPORTED
+#include "esp_private/gdma.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "hal/spi_types.h"
+#elif CONFIG_IDF_TARGET_ESP32
+#include "driver/i2s_types.h"
+#endif
+
+#include "esp_adc/adc_filter.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    ADC_FSM_INIT,
+    ADC_FSM_STARTED,
+} adc_fsm_t;
+
+/*---------------------------------------------------------------
+            Driver Context
+---------------------------------------------------------------*/
+typedef struct adc_iir_filter_t adc_iir_filter_t;
+typedef struct adc_continuous_ctx_t adc_continuous_ctx_t;
+
+/**
+ * @brief ADC iir filter context
+ */
+struct adc_iir_filter_t {
+    adc_digi_iir_filter_t filter_id;                            // Filter ID
+    adc_continuous_iir_filter_config_t  cfg;                    //filter configuration
+    adc_continuous_ctx_t                *continuous_ctx;        //ADC continuous driver context
+};
+
+/**
+ * @brief ADC continuous driver context
+ */
+struct adc_continuous_ctx_t {
+    uint8_t                         *rx_dma_buf;                //dma buffer
+    adc_hal_dma_ctx_t               hal;                        //hal context
+#if SOC_GDMA_SUPPORTED
+    gdma_channel_handle_t           rx_dma_channel;             //dma rx channel handle
+#elif CONFIG_IDF_TARGET_ESP32S2
+    spi_host_device_t               spi_host;                   //ADC uses this SPI DMA
+#elif CONFIG_IDF_TARGET_ESP32
+    i2s_port_t                      i2s_host;                   //ADC uses this I2S DMA
+#endif
+    intr_handle_t                   dma_intr_hdl;               //DMA Interrupt handler
+    RingbufHandle_t                 ringbuf_hdl;                //RX ringbuffer handler
+    void*                           ringbuf_storage;            //Ringbuffer storage buffer
+    void*                           ringbuf_struct;             //Ringbuffer structure buffer
+    intptr_t                        rx_eof_desc_addr;           //eof descriptor address of RX channel
+    adc_fsm_t                       fsm;                        //ADC continuous mode driver internal states
+    bool                            use_adc1;                   //1: ADC unit1 will be used; 0: ADC unit1 won't be used.
+    bool                            use_adc2;                   //1: ADC unit2 will be used; 0: ADC unit2 won't be used. This determines whether to acquire sar_adc2_mutex lock or not.
+    adc_atten_t                     adc1_atten;                 //Attenuation for ADC1. On this chip each ADC can only support one attenuation.
+    adc_atten_t                     adc2_atten;                 //Attenuation for ADC2. On this chip each ADC can only support one attenuation.
+    adc_hal_digi_ctrlr_cfg_t        hal_digi_ctrlr_cfg;         //Hal digital controller configuration
+    adc_continuous_evt_cbs_t        cbs;                        //Callbacks
+    void                            *user_data;                 //User context
+    esp_pm_lock_handle_t            pm_lock;                    //For power management
+#if SOC_ADC_DIG_IIR_FILTER_SUPPORTED
+    adc_iir_filter_t                *iir_filter[SOC_ADC_DIGI_IIR_FILTER_NUM];  //ADC IIR filter context
+#endif
+};
+
+
+#ifdef __cplusplus
+}
+#endif