59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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/* Check port settings for clock and data line */
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#if !(defined(PS2_CLOCK_PORT) && defined(PS2_CLOCK_PIN) && defined(PS2_CLOCK_DDR) && defined(PS2_CLOCK_BIT))
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# error "PS/2 clock port setting is required in config.h"
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#endif
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#if !(defined(PS2_DATA_PORT) && defined(PS2_DATA_PIN) && defined(PS2_DATA_DDR) && defined(PS2_DATA_BIT))
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# error "PS/2 data port 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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PS2_CLOCK_PORT &= ~(1 << PS2_CLOCK_BIT);
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PS2_CLOCK_DDR |= (1 << PS2_CLOCK_BIT);
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}
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void clock_hi(void) {
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/* input with pull up */
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PS2_CLOCK_DDR &= ~(1 << PS2_CLOCK_BIT);
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PS2_CLOCK_PORT |= (1 << PS2_CLOCK_BIT);
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}
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bool clock_in(void) {
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PS2_CLOCK_DDR &= ~(1 << PS2_CLOCK_BIT);
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PS2_CLOCK_PORT |= (1 << PS2_CLOCK_BIT);
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_delay_us(1);
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return PS2_CLOCK_PIN & (1 << PS2_CLOCK_BIT);
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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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PS2_DATA_PORT &= ~(1 << PS2_DATA_BIT);
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PS2_DATA_DDR |= (1 << PS2_DATA_BIT);
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}
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void data_hi(void) {
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/* input with pull up */
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PS2_DATA_DDR &= ~(1 << PS2_DATA_BIT);
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PS2_DATA_PORT |= (1 << PS2_DATA_BIT);
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}
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bool data_in(void) {
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PS2_DATA_DDR &= ~(1 << PS2_DATA_BIT);
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PS2_DATA_PORT |= (1 << PS2_DATA_BIT);
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_delay_us(1);
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return PS2_DATA_PIN & (1 << PS2_DATA_BIT);
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}
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