[adc] Restore missing LIBRETINY code in a separated file (#7955)

esphome/components/adc/adc_sensor_libretiny.cpp

@@ -0,0 +1,48 @@
+#ifdef USE_LIBRETINY
+
+#include "adc_sensor.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace adc {
+
+static const char *const TAG = "adc.libretiny";
+
+void ADCSensor::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up ADC '%s'...", this->get_name().c_str());
+#ifndef USE_ADC_SENSOR_VCC
+  this->pin_->setup();
+#endif  // !USE_ADC_SENSOR_VCC
+}
+
+void ADCSensor::dump_config() {
+  LOG_SENSOR("", "ADC Sensor", this);
+#ifdef USE_ADC_SENSOR_VCC
+  ESP_LOGCONFIG(TAG, "  Pin: VCC");
+#else   // USE_ADC_SENSOR_VCC
+  LOG_PIN("  Pin: ", this->pin_);
+#endif  // USE_ADC_SENSOR_VCC
+  ESP_LOGCONFIG(TAG, "  Samples: %i", this->sample_count_);
+  LOG_UPDATE_INTERVAL(this);
+}
+
+float ADCSensor::sample() {
+  uint32_t raw = 0;
+  if (this->output_raw_) {
+    for (uint8_t sample = 0; sample < this->sample_count_; sample++) {
+      raw += analogRead(this->pin_->get_pin());  // NOLINT
+    }
+    raw = (raw + (this->sample_count_ >> 1)) / this->sample_count_;  // NOLINT(clang-analyzer-core.DivideZero)
+    return raw;
+  }
+  for (uint8_t sample = 0; sample < this->sample_count_; sample++) {
+    raw += analogReadVoltage(this->pin_->get_pin());  // NOLINT
+  }
+  raw = (raw + (this->sample_count_ >> 1)) / this->sample_count_;  // NOLINT(clang-analyzer-core.DivideZero)
+  return raw / 1000.0f;
+}
+
+}  // namespace adc
+}  // namespace esphome
+
+#endif  // USE_LIBRETINY

tests/components/adc/test.bk72xx-ard.yaml

@@ -0,0 +1,4 @@
+sensor:
+  - platform: adc
+    pin: P23
+    name: Basic ADC Test