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