Create STM32_LA.ino

STM32_LA.ino

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+/*
+   Author : Vincenzo G
+   https://www.hackster.io/vincenzo-g/diy-logic-analyzer-f61ee5
+   
+*/
+
+#define samples 300
+#define boardLed PB1
+uint8_t initial, state, old_state;
+uint8_t pinChanged[samples];
+uint32_t timer[samples];
+uint16_t event = 0;
+
+//uncomment it if you want to use the USART1 instead of DFU serial 
+//#define Serial Serial1
+
+void setup() {
+
+  Serial.begin(115200);
+
+  pinMode (boardLed, OUTPUT);
+  digitalWrite(boardLed, LOW);
+
+  pinMode(PB12, INPUT_PULLUP);
+  pinMode(PB13, INPUT_PULLUP);
+  pinMode(PB14, INPUT_PULLUP);
+  pinMode(PB15, INPUT_PULLUP);
+
+  startLA();
+
+}
+
+
+void startLA() {
+  //delay(1000);
+
+  event = 0;
+  digitalWrite(boardLed, HIGH);
+  
+  reset_timer();
+  initial = GPIOB->regs->IDR >> 12;
+  state = initial;
+
+}
+
+void loop() {
+
+  old_state = state;
+  state = GPIOB->regs->IDR >> 12;
+
+  if (old_state != state) {
+    timer[event] = micros();
+    pinChanged[event] = state ^ old_state;
+    event++;
+
+    if (event == samples) {
+      sendData();
+      while (Serial.read() != 'G') ;  //wait for the "go"
+      startLA();
+    }
+  }
+}
+
+void sendData() {
+  digitalWrite(boardLed, LOW);
+
+  //initial data
+  Serial.println("S");
+  Serial.print(initial); Serial.print(":");
+  Serial.println(samples);
+
+  //data
+  for (int i = 0; i < samples; i++) {
+    Serial.print(pinChanged[i]); Serial.print(":");
+    Serial.println(timer[i]);
+  }
+}
+
+void reset_timer() {
+  systick_uptime_millis = -1;
+  SYSTICK_BASE->CNT = 0;
+}