- #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
- writePinLow(PS2_CLOCK_PIN);
- setPinOutput(PS2_CLOCK_PIN);
- }
-
- void clock_hi(void) {
- setPinInputHigh(PS2_CLOCK_PIN);
- }
-
- bool clock_in(void) {
- setPinInputHigh(PS2_CLOCK_PIN);
- wait_us(1);
- return readPin(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
- writePinLow(PS2_DATA_PIN);
- setPinOutput(PS2_DATA_PIN);
- }
-
- void data_hi(void) {
- setPinInputHigh(PS2_DATA_PIN);
- }
-
- bool data_in(void) {
- setPinInputHigh(PS2_DATA_PIN);
- wait_us(1);
- return readPin(PS2_DATA_PIN);
- }
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