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// Inquestra DAQ Firmware for ESP32-S3 (Arduino Core / ESP-IDF)
// Continuous 1,000 Hz instrument telemetry sampling with hardware timer

#include <Arduino.h>

const int SENSOR_PIN = 1;        // ADC1_CH0 (GPIO 1)
hw_timer_t *timer = NULL;
volatile uint32_t sampleCount = 0;

void IRAM_ATTR onSampleTimer() {
  sampleCount++;
}

void setup() {
  // High-speed native USB CDC at 921,600 baud
  Serial.begin(921600);
  analogReadResolution(12);       // 12-bit ADC (0 - 4095)

  // Configure 1 kHz hardware timer ISR
  timer = timerBegin(1000000);   // 1 MHz base
  timerAttachInterrupt(timer, &onSampleTimer);
  timerAlarm(timer, 1000, true, 0); // 1,000 ticks = 1 ms interval
}

void loop() {
  static uint32_t lastProcessed = 0;
  if (sampleCount != lastProcessed) {
    lastProcessed = sampleCount;
    int raw = analogRead(SENSOR_PIN);
    float voltage = (raw * 3.3f) / 4095.0f; // Scale to volts

    // Emits standard Inquestra CSV frame: [timestamp_ms],[voltage_mv]
    Serial.printf("%lu,%.4f\n", millis(), voltage * 1000.0f);
  }
}