bool KEYS::read3Bytes(uint32_t *data, uint8_t reg) {
union
{
uint8_t b[4];
uint32_t w;
} datau;
datau.w = *data;
Wire.beginTransmission(_address);
I2CWRITE((uint8_t) reg);
Wire.endTransmission();
uint8_t timeout=0;
Wire.requestFrom(_address, (uint8_t) 0x03);
while(Wire.available() < 3) {
timeout++;
if(timeout > I2CTIMEOUT) {
return(true);
}
delay(1);
} //Experimental
datau.b[0] = I2CREAD();
datau.b[1] = I2CREAD();
datau.b[2] = I2CREAD();
*data = datau.w;
return(false);
}
void I2C_4DI4RO::readGPIO() {
unsigned long t;
/* Start request, wait for data and receive GPIO values as byte */
Wire.requestFrom(_address, (uint8_t) 0x01);
t = micros();
// Time-out = 100uS
lastCommandOK = false;
while (Wire.available() < 1 && (micros() - t) < 100);
if(Wire.available() > 0) lastCommandOK = true;
_PIN = I2CREAD();
}
void PCF8574::readGPIO() {
#ifdef PCF8574_INTERRUPT_SUPPORT
/* Store old _PIN value */
_oldPIN = _PIN;
#endif
/* Start request, wait for data and receive GPIO values as byte */
Wire.requestFrom(_address, (uint8_t) 0x01);
while (Wire.available() < 1)
;
_PIN = I2CREAD();
}
bool KEYS::readByte(uint8_t *data, uint8_t reg) {
Wire.beginTransmission(_address);
I2CWRITE((uint8_t) reg);
Wire.endTransmission();
uint8_t timeout=0;
Wire.requestFrom(_address, (uint8_t) 0x01);
while(Wire.available() < 1) {
timeout++;
if(timeout > I2CTIMEOUT) {
return(true);
}
delay(1);
} // Experimental
*data = I2CREAD();
return(false);
}