uint8_t MCP23017::getLastInterruptPinValue(){
uint8_t intPin=getLastInterruptPin();
if(intPin!=MCP23017_INT_ERR){
uint8_t intcapreg=regForPin(intPin,MCP23017_INTCAPA,MCP23017_INTCAPB);
uint8_t bit=bitForPin(intPin);
return (readRegister(intcapreg)>>bit) & (0x01);
}
/**
* Helper to update a single bit of an A/B register.
* - Reads the current register value
* - Writes the new register value
*/
void MCP23017::updateRegisterBit(uint8_t pin, uint8_t pValue, uint8_t portAaddr, uint8_t portBaddr) {
uint8_t regValue;
uint8_t regAddr=regForPin(pin,portAaddr,portBaddr);
uint8_t bit=bitForPin(pin);
regValue = readRegister(regAddr);
// set the value for the particular bit
bit_write(pValue,regValue,bit);
writeRegister(regAddr,regValue);
}
/**
* Helper to update a single bit of an A/B register.
* - Reads the current register value
* - Writes the new register value
*/
void RFduinoProXShield::updateRegisterBit(uint8_t pin, uint8_t pValue, uint8_t portAaddr, uint8_t portBaddr) {
uint8_t regValue;
uint8_t regAddr=regForPin(pin,portAaddr,portBaddr);
uint8_t bit=bitForPin(pin);
regValue = readRegister(regAddr);
// set the value for the particular bit
bitWrite(regValue,bit,pValue);
writeRegister(regAddr,regValue);
}
void MCP23017::digitalWrite(uint8_t pin, uint8_t d) {
uint8_t gpio;
uint8_t bit=bitForPin(pin);
// read the current GPIO output latches
uint8_t regAddr=regForPin(pin,MCP23017_OLATA,MCP23017_OLATB);
gpio = readRegister(regAddr);
// set the pin and direction
bit_write(d,gpio,bit);
// write the new GPIO
regAddr=regForPin(pin,MCP23017_GPIOA,MCP23017_GPIOB);
writeRegister(regAddr,gpio);
}
uint8_t MCP23017::digitalRead(uint8_t pin) {
uint8_t bit=bitForPin(pin);
uint8_t regAddr=regForPin(pin,MCP23017_GPIOA,MCP23017_GPIOB);
return (readRegister(regAddr) >> bit) & 0x1;
}
