initial code commit
This commit is contained in:
Lurkars
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#include <Wire.h>
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#include "Arduino.h"
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#include "bombatuino_INPUT_MCP23017.h"
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void INPUT_MCP23017::begin(uint8_t addr,CallbackFunction cbF) {
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Wire.begin();
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//check hardware address
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if (addr > 7)
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_addr = 7;
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else _addr = addr;
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_callbackFunction = cbF;
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//set all ports as inputs
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write((byte)MCP23017_IODIR_A); //PORT A
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Wire.write(0xFF);
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Wire.endTransmission();
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_IODIR_B); //PORT B
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Wire.write(0xFF);
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Wire.endTransmission();
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//activate pullup resistors
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPPU_A); //PORT A
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Wire.write(0xFF);
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Wire.endTransmission();
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPPU_B); //PORT B
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Wire.write(0xFF);
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Wire.endTransmission();
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//inverse all inputs
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write((byte)MCP23017_IPOL_A); //PORT A
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Wire.write(0xFF);
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Wire.endTransmission();
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_IPOL_B); //PORT B
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Wire.write(0xFF);
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Wire.endTransmission();
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//init start values
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uint8_t pin,bank;
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//read bank A
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPIO_A);
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Wire.endTransmission();
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Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
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bank = Wire.read();
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for (pin=0; pin<8; pin++)
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_value[pin] = (bank >> pin) & 0x1;
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//read bank B
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPIO_B);
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Wire.endTransmission();
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Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
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bank = Wire.read();
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for (pin=8; pin<16; pin++)
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_value[pin] = (bank >> (pin-8)) & 0x1;
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}
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void INPUT_MCP23017::loop() {
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uint8_t pin,bank;
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int value;
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//read bank A
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPIO_A);
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Wire.endTransmission();
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Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
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bank = Wire.read();
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for (pin=0; pin<8; pin++) {
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value = (bank >> pin) & 0x1;
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if (_value[pin] != value) {
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_value[pin] = value;
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(*_callbackFunction)(_addr,pin,value);
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}
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}
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//read bank B
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPIO_B);
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Wire.endTransmission();
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Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
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bank = Wire.read();
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for (pin=8; pin<16; pin++) {
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value = (bank >> (pin-8)) & 0x1;
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if (_value[pin] != value) {
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_value[pin] = value;
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(*_callbackFunction)(_addr,pin,value);
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}
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}
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}
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//maybe useful later
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int INPUT_MCP23017::getSpecificValue(uint8_t pin) {
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if (pin > 16)
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return LOW;
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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uint8_t p = pin;
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if (pin > 8) {
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Wire.write(MCP23017_GPIO_B);
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p -= 8;
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} else
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Wire.write(MCP23017_GPIO_A);
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Wire.endTransmission();
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uint8_t bank = Wire.read();
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int value = (bank >> p) & 0x1;
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_value[pin] = value;
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return value;
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}
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@@ -0,0 +1,89 @@
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/**
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* @file bombatuino_INPUT_MCP23017.h
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*
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* @author Lukas Haubaum (lukas@haubaum.de)
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*
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* @date February, 2013
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*
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* @brief arduino library for reading inputs from MCP23017 port Expander
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*
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* library is for specialiced use: all I/O ports are used as digital inputs with internal pullup resistor active, values are stored and a callback function is called, when a value changes.
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* ATTETION: Wire.h must be included in sketch #include <Wire.h>
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*
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* */
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#ifndef bombatuino_INPUT_MCP23017_h
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#define bombatuino_INPUT_MCP23017_h
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#if !defined(CallbackFunction)
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/**
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* callback function
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*
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* @param address
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* @param pin
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* @param value
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*/
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typedef void (*CallbackFunction)(int,int,int);
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#endif
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class INPUT_MCP23017
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{
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public:
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/**
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* initalize the class, should be called in setup() function
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*
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* @param hardware address (0-7)
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* @param callback function
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*/
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void begin(uint8_t addr,CallbackFunction cbF);
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/**
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* read values and call callback function on change, should be called in loop()
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*/
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void loop(void);
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/**
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* get value of specific pin (0-15)
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*
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* @param pin
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* @return value of pin
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*/
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int getSpecificValue(uint8_t pin);
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private:
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uint8_t _addr; /**< hardware address (0-7) */
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int _value[16]; /**< read values */
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CallbackFunction _callbackFunction; /**< callback function */
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};
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#define MCP23017_ADDRESS 0x20 /**< hardware address */
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/**
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* registers of MCP23017 (BANK = 0)
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*
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* default is 0 except for I/O DIRECTION REGISTERS
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*
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* for detailed description see http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf
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*
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* */
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#define MCP23017_IODIR_A 0x00 /**< I/O DIRECTION REGISTER PORT A - Controls the direction of the data I/O. */
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#define MCP23017_IODIR_B 0x01 /**< I/O DIRECTION REGISTER PORT B - Controls the direction of the data I/O. */
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#define MCP23017_IPOL_A 0x02 /**< INPUT POLARITY REGISTER PORT A - This register allows the user to configure the polarity on the corresponding GPIO port bits. */
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#define MCP23017_IPOL_B 0x03 /**< INPUT POLARITY REGISTER PORT B - This register allows the user to configure the polarity on the corresponding GPIO port bits. */
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#define MCP23017_GPINTEN_A 0x04 /**< INTERRUPT-ON-CHANGE CONTROL REGISTER PORT A - The GPINTEN register controls the interrupt-on-change feature for each pin. */
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#define MCP23017_GPINTEN_B 0x05 /**< INTERRUPT-ON-CHANGE CONTROL REGISTER PORT B - The GPINTEN register controls the interrupt-on-change feature for each pin. */
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#define MCP23017_DEFVAL_A 0x06 /**< DEFAULT COMPARE REGISTER FOR INTERRUPT-ON-CHANGE PORT A - The default comparison value is configured in the DEFVAL register. */
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#define MCP23017_DEFVAL_B 0x07 /**< DEFAULT COMPARE REGISTER FOR INTERRUPT-ON-CHANGE PORT B - The default comparison value is configured in the DEFVAL register.. */
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#define MCP23017_INTCON_A 0x08 /**< INTERRUPT CONTROL REGISTER PORT A - The INTCON register controls how the associated pin value is compared for the interrupt-on-change feature. */
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#define MCP23017_INTCON_B 0x09 /**< INTERRUPT CONTROL REGISTER PORT B - The INTCON register controls how the associated pin value is compared for the interrupt-on-change feature.*/
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#define MCP23017_IOCON_A 0x0A /**< CONFIGURATION REGISTER - The IOCON register contains several bits for configuring the device. BANK/MIRROR/SEQOP/DISSLW/HAEN/ODR/INTPOL/— */
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#define MCP23017_IOCON_B 0x0B /**< CONFIGURATION REGISTER - The IOCON register contains several bits for configuring the device. BANK/MIRROR/SEQOP/DISSLW/HAEN/ODR/INTPOL/— */
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#define MCP23017_GPPU_A 0x0C /**< PULL-UP RESISTOR CONFIGURATION REGISTER PORT A - The GPPU register controls the pull-up resistors for the port pins. */
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#define MCP23017_GPPU_B 0x0D /**< PULL-UP RESISTOR CONFIGURATION REGISTER PORT B - The GPPU register controls the pull-up resistors for the port pins. */
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#define MCP23017_INTF_A 0x0E /**< INTERRUPT FLAG REGISTER PORT A - The INTF register reflects the interrupt condition on the port pins of any pin that is enabled for interrupts via the GPINTEN register. */
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#define MCP23017_INTF_B 0x0F /**< INTERRUPT FLAG REGISTER PORT B - The INTF register reflects the interrupt condition on the port pins of any pin that is enabled for interrupts via the GPINTEN register. */
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#define MCP23017_INTCAP_A 0x10 /**< INTERRUPT CAPTURE REGISTER PORT A - The INTCAP register captures the GPIO port value at the time the interrupt occurred. */
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#define MCP23017_INTCAP_B 0x11 /**< INTERRUPT CAPTURE REGISTER PORT B - The INTCAP register captures the GPIO port value at the time the interrupt occurred. */
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#define MCP23017_GPIO_A 0x12 /**< PORT REGISTER PORT A - The GPIO register reflects the value on the port. */
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#define MCP23017_GPIO_B 0x13 /**< PORT REGISTER PORT B - The GPIO register reflects the value on the port. */
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#define MCP23017_OLAT_A 0x14 /**< OUTPUT LATCH REGISTER PORT A - The OLAT register provides access to the output latches. */
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#define MCP23017_OLAT_B 0x15 /**< OUTPUT LATCH REGISTER PORT B - The OLAT register provides access to the output latches. */
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#endif
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