Minimize contract, add ADC read and send its data to coonsole

esp32/main/adc_reader.cpp

@@ -0,0 +1,26 @@
+#include "adc_reader.h"
+
+extern "C" {
+#include "esp_adc/adc_oneshot.h"
+}
+
+static adc_oneshot_unit_handle_t adc_handle;
+
+void adc_reader_init() {
+    adc_oneshot_unit_init_cfg_t init_config = {};
+    init_config.unit_id = ADC_UNIT_1;
+
+    adc_oneshot_new_unit(&init_config, &adc_handle);
+
+    adc_oneshot_chan_cfg_t config = {};
+    config.atten = ADC_ATTEN_DB_12;
+    config.bitwidth = ADC_BITWIDTH_DEFAULT;
+
+    adc_oneshot_config_channel(adc_handle, ADC_CHANNEL_7, &config); // GPIO35
+}
+
+int adc_reader_read() {
+    int val = 0;
+    adc_oneshot_read(adc_handle, ADC_CHANNEL_7, &val);
+    return val;
+}