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/*
* Copyright 2020 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#ifndef GPIO_H
#define GPIO_H
#include <stdio.h>
class GPIO {
private:
GPIO(const GPIO ©);
unsigned int pin_dir, pin_pull, pin_out, pull_dir;
#ifdef GPIO_TRACE
void print_pinstate() {
unsigned int mask = 1;
for (unsigned char i=0; i < 32; i++) {
if (i == 0) {
fputs("▶ LED ", stdout);
}
else if (i == 8) {
fputs(" GPIO ", stdout);
}
else if (i == 16) {
fputs(" ", stdout);
}
else if (i == 24) {
fputs(" ", stdout);
}
if (pin_dir & mask) {
if (pin_out & (1<<i)) {
fputs("█", stdout);
} else {
putc(' ', stdout);
}
} else {
if (pin_pull & mask) {
if (pull_dir & mask) {
fputs("↑", stdout);
} else {
fputs("↓", stdout);
}
} else {
fputs("·", stdout);
}
}
mask <<= 1;
}
putc('\n', stdout);
}
#else
inline void print_pinstate() {}
#endif
public:
GPIO () : pin_dir(0), pin_pull(0), pin_out(0), pull_dir(0) {}
enum Pin : unsigned char {
pl0 = 0, pl1, pl2, pl3, pl4, pl5, pl6, pl7,
px00, px01, px02, px03, px04, px05, px06, px07,
px08, px09, px10, px11, px12, px13, px14, px15,
px16, px17, px18, px19, px20, px21, px22, px23
};
inline void setup() {
pin_dir |= 0x0000ff;
}
inline void led_on(unsigned char id = 0) {
if (id <= pl7) {
pin_out |= (1 << id);
}
print_pinstate();
}
inline void led_off(unsigned char id = 0) {
if (id <= pl7) {
pin_out &= ~(1 << id);
}
print_pinstate();
}
inline void led_toggle(unsigned char id = 0) {
if (id <= pl7) {
if (pin_out & (1 << id)) {
led_off(id);
} else {
led_on(id);
}
}
}
inline void input(unsigned char const pin) {
pin_dir &= ~(1<<pin);
print_pinstate();
}
inline void input(unsigned char const pin, unsigned char const pull) {
pin_dir &= ~(1<<pin);
pin_pull |= (1<<pin);
if (pull) {
pull_dir |= (1<<pin);
} else {
pull_dir &= ~(1<<pin);
}
print_pinstate();
}
inline void output(unsigned char const pin) {
pin_dir |= (1<<pin);
print_pinstate();
}
inline void output(unsigned char const pin, unsigned char const value) {
pin_dir |= (1<<pin);
if (value)
pin_out |= (1<<pin);
else
pin_out &= ~(1<<pin);
print_pinstate();
}
#pragma GCC diagnostic ignored "-Wunused-parameter"
inline unsigned char read(unsigned char const pin) {
return 1;
}
#pragma GCC diagnostic pop
inline void write(unsigned char const pin, unsigned char value) {
if (value)
pin_out |= (1<<pin);
else
pin_out &= ~(1<<pin);
print_pinstate();
}
inline void enable_int() {}
inline void disable_int() {}
};
extern GPIO gpio;
#endif
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