Feature:ADC

src/ADCconf.cpp

@@ -0,0 +1,94 @@
+#include "ADCconf.h"
+
+bool IRAM_ATTR ADC_BME::adc_dma_callback(adc_continuous_handle_t handle, const adc_continuous_evt_data_t *edata, void *user_data){
+    ADC_BME* adc =static_cast<ADC_BME*>(user_data);
+    adc->dma_data_ready = true;
+    return false;
+}
+
+void ADC_BME::config(const uint32_t muestras_bloque, adc_channel_t channel, const uint32_t hz_adc, uint8_t* dma_buffer){
+    _FRAME_SIZE=muestras_bloque*4;
+    _POOL_SIZE=_FRAME_SIZE*4;
+    _channel=channel;
+    _HZ_ADC=hz_adc;
+    _dma_buffer=dma_buffer;
+}
+
+void ADC_BME::setup(){
+    adc_continuous_handle_cfg_t ADC_config = {
+        .max_store_buf_size = _POOL_SIZE,
+        .conv_frame_size = _FRAME_SIZE,
+    };
+    ESP_ERROR_CHECK(adc_continuous_new_handle(&ADC_config, &handle_ADC));
+
+    adc_digi_pattern_config_t channel_config = {0};
+    channel_config.channel = _channel;
+    channel_config.atten = ADC_ATTEN_DB_12;
+    channel_config.bit_width = ADC_BITWIDTH_12;
+    channel_config.unit = ADC_UNIT_1;
+
+    adc_continuous_config_t adc_config = {
+          .pattern_num = 1,
+          .adc_pattern = &channel_config,
+          .sample_freq_hz = _HZ_ADC,
+          .conv_mode = ADC_CONV_SINGLE_UNIT_1,
+    };
+
+    ESP_ERROR_CHECK(adc_continuous_config(handle_ADC, &adc_config));
+
+    adc_continuous_evt_cbs_t cb_config = {
+        .on_conv_done = adc_dma_callback,
+        .on_pool_ovf = NULL
+    };
+
+    ESP_ERROR_CHECK(adc_continuous_register_event_callbacks(handle_ADC, &cb_config, this));
+    ESP_ERROR_CHECK(adc_continuous_start(handle_ADC));
+    Serial.println("DMA Iniciado con sistema de bandera.");
+}
+
+uint32_t ADC_BME::read(uint16_t* samples_buffer) {
+
+    if (!dma_data_ready) {
+        return 0;
+    }
+
+    dma_data_ready = false;
+    uint32_t ret_num = 0;
+
+    // Leer datos DMA
+    esp_err_t ret = adc_continuous_read(handle_ADC,_dma_buffer,_FRAME_SIZE,&ret_num,0);
+
+    if (ret != ESP_OK)
+        return 0;
+
+    // Buffer temporal parseado
+    adc_continuous_data_t parsed_data[_FRAME_SIZE/4];
+
+    uint32_t parsed_count = 0;
+
+    // Parsear datos
+    esp_err_t parse_ret =
+        adc_continuous_parse_data(
+            handle_ADC,
+            _dma_buffer,
+            ret_num,
+            parsed_data,
+            &parsed_count
+        );
+
+    if (parse_ret != ESP_OK) {
+        return 0;
+    }
+
+    uint32_t valid_samples = 0;
+    // Copiar muestras limpias
+    for (uint32_t i = 0; i < parsed_count; i++) {
+        if (!parsed_data[i].valid)
+            continue;
+
+        samples_buffer[valid_samples] = parsed_data[i].raw_data;
+        valid_samples++;
+    }
+
+    return valid_samples;
+}