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keybrd/src/LED_PortOpenDrain.h

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2016-11-16 03:01:42 +00:00
#ifndef LED_PORT_H
#define LED_PORT_H
#include <Arduino.h>
#include <inttypes.h>
#include <LEDInterface.h>
#include <PortWriteInterface.h>
/* An LED_PortOpenDrain object is an I/O expander ouput pin that is connected to an LED.
LED_PortOpenDrain functions turn LED on and off.
LED anode connected to power. LED cathode connected to open-drain ouput pin.
2016-11-16 03:01:42 +00:00
This class is for open drain ouput pins.
2016-11-16 03:01:42 +00:00
For LEDs connected to push-pull output types, use LED_Port class.
Example initialization:
const uint8_t IOE_ADDR = 0x20;
Port_MCP23S17 portA(IOE_ADDR, 0, 1<<0 | 1<<1 );
LED_PortOpenDrain LED_fn(portA, 1<<5);
Example initialization:
Port_ShiftRegs shiftRegs(8);
LED_PortOpenDrain LED_fn(shiftRegs, 1<<6);
*/
class LED_PortOpenDrain : public LEDInterface
{
private:
PortWriteInterface& refPort;
const uint8_t pin; //bit pattern, 1 is pin connected to LED
public:
LED_PortOpenDrain(PortWriteInterface& refPort, const uint8_t pin)
: refPort(refPort), pin(pin) {}
virtual void on();
virtual void off();
};
#endif