void Adafruit_NFCShield_I2C::wirereaddata(uint8_t* buff, uint8_t n) {
uint16_t timer = 0;
delay(2);
#ifdef PN532DEBUG
Serial.print("Reading: ");
#endif
// Start read (n+1 to take into account leading 0x01 with I2C)
Wire.requestFrom((uint8_t)PN532_I2C_ADDRESS, (uint8_t)(n+2));
// Discard the leading 0x01
wirerecv();
for (uint8_t i=0; i<n; i++) {
delay(1);
buff[i] = wirerecv();
#ifdef PN532DEBUG
Serial.print(" 0x");
Serial.print(buff[i], HEX);
#endif
}
// Discard trailing 0x00 0x00
// wirerecv();
#ifdef PN532DEBUG
Serial.println();
#endif
}
//Added to default library
//From the Adafruit_RGBLCDShield library we learn that the
//buttons are on bits 0..4, which are on GPIOA,
//so we use GPINTENA, INTCONA and IOCONA.
void Adafruit_MCP23017::enableButtonInterrupt() {
uint8_t data;
//Enable the interrupts on the button pins 0..4
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_GPINTENA);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
data = wirerecv();
data |= 0x1F; //Bits 0..4 high, to enable IOC
//Write the new value back
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_GPINTENA);
wiresend(data);
Wire.endTransmission();
//We set INTCONA bits 0..4 to 0 = State change interrupt
//(instead of compare to state)
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_INTCONA);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
data = wirerecv();
data &= ~0x1F; //Force bits 0..4 to low
//Write the new value back
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_INTCONA);
wiresend(data);
Wire.endTransmission();
//We set the INTA pin to Active-Low
//first read current register value
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_IOCONA);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
data = wirerecv();
//Bit 1 = INTPOL = Low = Active-Low
//(When disabled or no interrupt, signal is high)
data &= ~0x02;
//Bit 2 = ODR = Low = Open Drain disabled
data &= ~0x04;
//Bit 6 = MIRROR = Low = INTA/INTB seperate
data &= ~0x40;
//Write the new value back
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_IOCONA);
wiresend(data);
Wire.endTransmission();
}
/**
* Reads a given register
*/
uint8_t Adafruit_MCP23017::readRegister(uint8_t addr){
// read the current GPINTEN
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(addr);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
return wirerecv();
}
/**
* Reads all 16 pins (port A and B) into a single 16 bits variable.
*/
uint16_t Adafruit_MCP23017::readGPIOAB() {
uint16_t ba = 0;
uint8_t a;
// read the current GPIO output latches
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_GPIOA);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 2);
a = wirerecv();
ba = wirerecv();
ba <<= 8;
ba |= a;
return ba;
}
//-----------------------------------------------------
// This function read a single register
// RegAdd = Register address
// i2caddr = device address (0 to 7. See A0, A1 e A2 configurations)
// This function return the value of selected register
uint8_t MCP23017::ReadSingleReg(uint8_t RegAdd, uint8_t i2caddr) {
if (i2caddr > 7) { i2caddr = 7; }
Wire.beginTransmission(MCP23017_HW_ADD | i2caddr);
wiresend(RegAdd);
Wire.endTransmission();
Wire.requestFrom(MCP23017_HW_ADD | i2caddr, 1);
return wirerecv();
}
/**
* Read a single port, A or B, and return its current 8 bit value.
* Parameter b should be 0 for GPIOA, and 1 for GPIOB.
*/
uint8_t Adafruit_MCP23017::readGPIO(uint8_t b) {
// read the current GPIO output latches
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
if (b == 0)
wiresend(MCP23017_GPIOA);
else {
wiresend(MCP23017_GPIOB);
}
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
return wirerecv();
}
//Added to default library
void Adafruit_MCP23017::disableButtonInterrupt() {
uint8_t data;
//Disable the interrupts on the button pins 0..4
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_GPINTENA);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
data = wirerecv();
data &= ~0x1F; //Bits 0..4 low, to disable IOC
//Write the new value back
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(MCP23017_GPINTENA);
wiresend(data);
Wire.endTransmission();
}
//-----------------------------------------------------
// This function sets a single bit into selected register
// RegAdd = Register address
// Bit = Bit to set
// i2caddr = device address (0 to 7. See A0, A1 e A2 configurations)
void MCP23017::SetSingleBit(uint8_t RegAdd, uint8_t Bit, uint8_t i2caddr) {
uint8_t RegData;
if (i2caddr > 7) { i2caddr = 7; }
if (Bit > 7) { Bit = 7; }
Wire.beginTransmission(MCP23017_HW_ADD | i2caddr);
wiresend(RegAdd);
Wire.endTransmission();
Wire.requestFrom(MCP23017_HW_ADD | i2caddr, 1);
RegData = wirerecv();
RegData |= (0x01 << Bit);
Wire.beginTransmission(MCP23017_HW_ADD | i2caddr);
wiresend(RegAdd);
wiresend(RegData);
Wire.endTransmission();
}
uint8_t MCP23017::digitalRead(uint8_t p) {
uint8_t gpioaddr;
// only 16 bits!
if (p > 15)
return 0;
if (p < 8)
gpioaddr = MCP23017_GPIOA;
else {
gpioaddr = MCP23017_GPIOB;
p -= 8;
}
// read the current GPIO
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(gpioaddr);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
return (wirerecv() >> p) & 0x1;
}
void MCP23017::digitalWrite(uint8_t p, uint8_t d)
{
uint8_t gpio;
uint8_t gpioaddr, olataddr;
// only 16 bits!
if (p > 15)
return;
if (p < 8) {
olataddr = MCP23017_OLATA;
gpioaddr = MCP23017_GPIOA;
} else {
olataddr = MCP23017_OLATB;
gpioaddr = MCP23017_GPIOB;
p -= 8;
}
// read the current GPIO output latches
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(olataddr);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
gpio = wirerecv();
// set the pin and direction
if (d == HIGH) {
gpio |= 1 << p;
} else {
gpio &= ~(1 << p);
}
// write the new GPIO
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(gpioaddr);
wiresend(gpio);
Wire.endTransmission();
}
void MCP23017::pullUp(uint8_t p, uint8_t d)
{
uint8_t gppu;
uint8_t gppuaddr;
// only 16 bits!
if (p > 15)
return;
if (p < 8)
gppuaddr = MCP23017_GPPUA;
else {
gppuaddr = MCP23017_GPPUB;
p -= 8;
}
// read the current pullup resistor set
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(gppuaddr);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
gppu = wirerecv();
// set the pin and direction
if (d == HIGH) {
gppu |= 1 << p;
} else {
gppu &= ~(1 << p);
}
// write the new GPIO
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(gppuaddr);
wiresend(gppu);
Wire.endTransmission();
}
void MCP23017::pinMode(uint8_t p, uint8_t d)
{
uint8_t iodir;
uint8_t iodiraddr;
// only 16 bits!
if (p > 15)
return;
if (p < 8)
iodiraddr = MCP23017_IODIRA;
else {
iodiraddr = MCP23017_IODIRB;
p -= 8;
}
// read the current IODIR
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(iodiraddr);
Wire.endTransmission();
Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);
iodir = wirerecv();
// set the pin and direction
if (d == INPUT) {
iodir |= 1 << p;
} else {
iodir &= ~(1 << p);
}
// write the new IODIR
Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);
wiresend(iodiraddr);
wiresend(iodir);
Wire.endTransmission();
}
