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https://github.com/aster94/logic-analyzer.git
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83 lines
1.4 KiB
C++
83 lines
1.4 KiB
C++
/*
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Author : Vincenzo G
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https://www.hackster.io/vincenzo-g/diy-logic-analyzer-f61ee5
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*/
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#define samples 300
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#define boardLed PB1
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uint8_t initial, state, old_state;
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uint8_t pinChanged[samples];
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uint32_t timer[samples];
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uint16_t event = 0;
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//uncomment it if you want to use the USART1 instead of DFU serial
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//#define Serial Serial1
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void setup() {
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Serial.begin(115200);
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pinMode (boardLed, OUTPUT);
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digitalWrite(boardLed, LOW);
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pinMode(PB12, INPUT_PULLUP);
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pinMode(PB13, INPUT_PULLUP);
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pinMode(PB14, INPUT_PULLUP);
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pinMode(PB15, INPUT_PULLUP);
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startLA();
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}
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void startLA() {
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//delay(1000);
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event = 0;
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digitalWrite(boardLed, HIGH);
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reset_timer();
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initial = GPIOB->regs->IDR >> 12;
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state = initial;
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}
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void loop() {
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old_state = state;
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state = GPIOB->regs->IDR >> 12;
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if (old_state != state) {
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timer[event] = micros();
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pinChanged[event] = state ^ old_state;
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event++;
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if (event == samples) {
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sendData();
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while (Serial.read() != 'G') ; //wait for the "go"
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startLA();
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}
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}
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}
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void sendData() {
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digitalWrite(boardLed, LOW);
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//initial data
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Serial.println("S");
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Serial.print(initial); Serial.print(":");
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Serial.println(samples);
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//data
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for (int i = 0; i < samples; i++) {
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Serial.print(pinChanged[i]); Serial.print(":");
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Serial.println(timer[i]);
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}
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}
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void reset_timer() {
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systick_uptime_millis = -1;
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SYSTICK_BASE->CNT = 0;
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}
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