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Log SPI bus from LCD of a Sndway SW-A40 laser distance meter.
/**
* Log SPI bus from LCD of a Sndway SW-A40 laser distance meter.
*
* Developed and tested on Arduino Mini 328P@16MHz.
* Requires circular buffer library from https://github.com/rlogiacco/CircularBuffer
* See https://www.mictronics.de/2018/02/laser-distance-meter-hack/
* Mictronics 2018 @ www.mictronics.de
*/
#include <CircularBuffer.h>
/**
* Pin connection to LCD SPI bus.
*/
const byte clkPin = 2; // LCD clock signal = IO2
const byte dataPin = 4; // LCD data signal = IO4
const byte csPin = 3; // LCD chip select signal = IO3
byte data = 0;
byte bitcount = 8;
CircularBuffer<byte,210> frame;
void setup() {
Serial.begin(115200);
Serial.println("Sndway Rangefinder v1.0");
pinMode(clkPin, INPUT);
pinMode(dataPin, INPUT);
pinMode(csPin, INPUT);
attachInterrupt(digitalPinToInterrupt(clkPin), readDataPin, RISING);
attachInterrupt(digitalPinToInterrupt(csPin), sendByte, RISING);
}
void loop() {
if(frame.isEmpty() == false){
Serial.write(frame.shift());
}
}
void readDataPin() {
if(digitalRead(csPin) == LOW) {
if(bitcount == 8) {
--bitcount;
return;
}
data |= (digitalRead(dataPin) << bitcount);
--bitcount;
}
}
void sendByte() {
frame.push(data);
data = 0;
bitcount = 8;
}
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