qui peut m'aidé a comprendre ce program
c'est pour faire une telecomande LANC pour camescope sony
je je sait pas coment le modifier pour envoyer les comande au camescope
merci d'avance
#define rxPin 2 // Receive Status from LANC Device (unimplemented)
#define txPin 3 // Send Commands to LANC DEVICE (works)
#define ledPin 13 // LEB for activity status flickering
#define bitMicroSeconds 104
byte ledPinState = 1;
void setup() {
Serial.begin(57600); // 9600, 14400, 38400, 57600, 115200
// define pin modes for tx, rx, led pins:
pinMode(rxPin, INPUT);
pinMode(txPin, OUTPUT);
pinMode(ledPin, OUTPUT);
// Blink LED 13 Just to Say 'Hello'
digitalWrite(13,HIGH);
delay(500);
digitalWrite(13,LOW);
delay(1000);
digitalWrite(13,HIGH);
delay(1000);
digitalWrite(13,LOW);
}
int block = 0;
int state = 0;
int in = 0;
void loop() {
int inBytes = Serial.available();
if (inBytes == 0) return;
if (inBytes >= 128) {
Serial.print(0,BYTE);
// Serial.flush();
return;
}
in = Serial.read();
if (in == 99) return;
/* switch (state) {
case 0 :
state = OkState(in);
return;
case 99: // ASCII 'c' for control
/
SendCode(40,in); // 40 == 0x28 "Special command to videocamer"
SendCode(40,in);
toggleLed();
Serial.print(in,BYTE);
/
state = 0;
return;
default:
state = 0;
return;
}
*/
}
/*
//READ
//Serial.print("S: ");
frameStartBitWait();
for(int byteNum = 0; byteNum < 8; byteNum++) {
byte in = readByte(rxPin,104);
lowWait(rxPin);
Serial.print(in,DEC);
if (byteNum!=7)
Serial.print(".");
else
Serial.println(";");
}
*/
void SendCode(int type,int code) {
frameStartBitWait();
writeByte(rxPin,type,bitMicroSeconds); // Video Cam Control
lowWait(rxPin);
writeByte(rxPin,code,bitMicroSeconds); // Tele/Wide
}
void lowWait(int pin) {
byte in = digitalRead(pin);
while (in) {
in = digitalRead(pin);
}
}
void frameStartBitWait() {
// finds thge start of a telegram/frame
unsigned long usec = pulseIn(rxPin,HIGH);
while (usec < 5864) { // 6230 experimentally with a RTV900
usec = pulseIn(rxPin,HIGH);
/* DEBUG
Serial.print(usec);
Serial.println(" microseconds");
*/
}
/* DEBUG
Serial.print("frame start after ");
Serial.print(usec);
Serial.println(" microseconds");
*/
}
byte readByte(int pin,unsigned long uSec /* bit width*/ ) {
byte result = 0;
delayMicroseconds(uSec * 1.5); // skips the Start Bit and Land in the midlle of the first byte
for (int i = 0; i < 8; i++) {
if (digitalRead(pin) == LOW) { // == LOW because bits inverted in LANC
result++;
}
result <<= 1;
delayMicroseconds(uSec);
}
delayMicroseconds(0.5*uSec);
return result; // return happens at end of last (8ths) bit
}
void writeByte(int pin, byte value, unsigned uSec /* bit width */) {
delayMicroseconds(uSec); // wait for stop bit
pinMode(pin,OUTPUT);
for (int i = 0; i < 8; i++) {
boolean bit = value & 0x1;
digitalWrite(pin,!bit); // NOT (!) pin because all data is inverted in LANC
value >>= 1;
delayMicroseconds(uSec);
}
pinMode(pin,INPUT); // return happends at end of last (8th) bit
}
void toggleLed() {
// set the LED pin using the pinState variable:
digitalWrite(ledPin, ledPinState);
// if pinState = 0, set it to 1, and vice versa:
ledPinState = !ledPinState;
}
je regarde.