working on getting outputs correct for ECG

src/main.cpp

@@ -1,15 +1,19 @@
+#include "esp32-hal-gpio.h"
 #include <Adafruit_GFX.h>
 #include <Arduino.h>
 #include <SerialCmd.h>
-#include <cstdint>
 #include <screen.h>
 
 #define BAUD 115200
 
+#define ECG_PIN 3
+
 SerialCmd cmd(Serial);
 
 unsigned long lastStatus = 0;
 
+bool read_ecg = false;
+
 void register_commands() {
   cmd.on("/ping", "— responds with pong",
          [](CmdArgs &args) { Serial.println("pong"); });
@@ -25,11 +29,25 @@ void register_commands() {
 
   cmd.on("/status", "— print device status", [](CmdArgs &args) {
     Serial.printf("uptime: %lus\n", millis() / 1000);
+    if (read_ecg) {
+      Serial.println("ECG reading enabled");
+    } else {
+      Serial.println("ECG reading disabled");
+    }
   });
 
   cmd.on("/scanI2C", "-scans for any recognizable I2C devices",
          [](CmdArgs &args) { Screen::wire_search(3); });
 
+  cmd.on("/ECG", "-turns on | off ECG serial output", [](CmdArgs &args) {
+    read_ecg = !read_ecg;
+    if (read_ecg) {
+      Serial.println("ECG reading enabled");
+    } else {
+      Serial.println("ECG reading disabled");
+    }
+  });
+
   cmd.onDefault(
       [](CmdArgs &args) { Serial.printf("unknown: %s\n", args.command()); });
 
@@ -47,16 +65,20 @@ void setup() {
   delay(10000);
   Serial.println("Delay Complete");
 
-  Screen::setup_screen();
-
-  Screen::test_fillrect();
-
   register_commands();
+  pinMode(ECG_PIN, INPUT);
+  analogSetPinAttenuation(ECG_PIN, ADC_11db);
 }
 
 void loop() {
   cmd.poll();
 
+  if (read_ecg) {
+    float ecg_val = analogRead(ECG_PIN);
+    Serial.printf("#graphf %f\n", ecg_val);
+    delay(5);
+  }
+
   // Periodic status to prove non-blocking
   if (millis() - lastStatus >= 10000) {
     lastStatus = millis();