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#include <stdbool.h>
#include "ps2_io.h"
#include "gpio.h"
#include "wait.h"
/* Check port settings for clock and data line */
#if !(defined(PS2_CLOCK_PIN))
# error "PS/2 clock setting is required in config.h"
#endif
#if !(defined(PS2_DATA_PIN))
# error "PS/2 data setting is required in config.h"
#endif
/*
* Clock
*/
void clock_init(void) {}
void clock_lo(void) {
// Transition from input with pull-up to output low via Hi-Z instead of output high
gpio_write_pin_low(PS2_CLOCK_PIN);
gpio_set_pin_output(PS2_CLOCK_PIN);
}
void clock_hi(void) {
gpio_set_pin_input_high(PS2_CLOCK_PIN);
}
bool clock_in(void) {
gpio_set_pin_input_high(PS2_CLOCK_PIN);
wait_us(1);
return gpio_read_pin(PS2_CLOCK_PIN);
}
/*
* Data
*/
void data_init(void) {}
void data_lo(void) {
// Transition from input with pull-up to output low via Hi-Z instead of output high
gpio_write_pin_low(PS2_DATA_PIN);
gpio_set_pin_output(PS2_DATA_PIN);
}
void data_hi(void) {
gpio_set_pin_input_high(PS2_DATA_PIN);
}
bool data_in(void) {
gpio_set_pin_input_high(PS2_DATA_PIN);
wait_us(1);
return gpio_read_pin(PS2_DATA_PIN);
}
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