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shift_74HC595.cpp
117 lines (64 loc) · 2.39 KB
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shift_74HC595.cpp
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/*
* Library for a 74HC595 Shift Register
*/
#include "Arduino.h"
#include "shift_74HC595.h"
Shift74HC595::Shift74HC595() {
};
void Shift74HC595::begin(uint8_t clk_pin, uint8_t data_pin, uint8_t latch_pin) {
this->clk_pin = clk_pin;
this->data_pin = data_pin;
this->latch_pin = latch_pin;
this->num_pins = 8; // Sets default number of pins as 8 (Amount of Output pins on a single 8 bit shift register)
pinMode(this->clk_pin, OUTPUT);
pinMode(this->data_pin, OUTPUT);
pinMode(this->latch_pin, OUTPUT);
fastWrite(this->clk_pin, LOW);
fastWrite(this->data_pin, LOW);
fastWrite(this->latch_pin, LOW);
};
void Shift74HC595::begin(uint8_t clk_pin, uint8_t data_pin, uint8_t latch_pin, uint16_t num_pins) {
this->clk_pin = clk_pin;
this->data_pin = data_pin;
this->latch_pin = latch_pin;
this->num_pins = num_pins;
pinMode(this->clk_pin, OUTPUT);
pinMode(this->data_pin, OUTPUT);
pinMode(this->latch_pin, OUTPUT);
fastWrite(this->clk_pin, LOW);
fastWrite(this->data_pin, LOW);
fastWrite(this->latch_pin, LOW);
};
void Shift74HC595::setPinValue(uint8_t pin, uint8_t state) {
this->out_value[map(pin, 0, this->num_pins-1, this->num_pins-1, 0)] = state;
};
void Shift74HC595::shiftOut() {
for (int i = 0; i < this->num_pins; i++) {
fastWrite(this->clk_pin, HIGH);
delayMicroseconds(PULSE_DELAY);
fastWrite(this->clk_pin, LOW);
fastWrite(this->data_pin, this->out_value[i]);
delayMicroseconds(PULSE_DELAY);
// Serial.print(this->out_value[i]);
}
fastWrite(this->clk_pin, LOW);
fastWrite(this->data_pin, LOW);
// Serial.println("");
fastWrite(this->latch_pin, HIGH);
delayMicroseconds(PULSE_DELAY);
fastWrite(this->clk_pin, HIGH);
fastWrite(this->latch_pin, LOW);
delayMicroseconds(PULSE_DELAY);
fastWrite(this->clk_pin, LOW);
delayMicroseconds(PULSE_DELAY);
};
void Shift74HC595::fastWrite(uint8_t pin, uint8_t val) {
uint8_t bit = digitalPinToBitMask(pin);
volatile uint8_t *out = portOutputRegister(digitalPinToPort(pin));
if (val == LOW) {
*out &= ~bit;
}
else {
*out |= bit;
}
};