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- #include <stdbool.h>
- #include <avr/io.h>
- #include <util/delay.h>
-
- /* Check port settings for clock and data line */
- #if !(defined(XT_CLOCK_PORT) && \
- defined(XT_CLOCK_PIN) && \
- defined(XT_CLOCK_DDR) && \
- defined(XT_CLOCK_BIT))
- # error "XT clock port setting is required in config.h"
- #endif
-
- #if !(defined(XT_DATA_PORT) && \
- defined(XT_DATA_PIN) && \
- defined(XT_DATA_DDR) && \
- defined(XT_DATA_BIT))
- # error "XT data port setting is required in config.h"
- #endif
-
- bool clock_in(void)
- {
- XT_CLOCK_DDR &= ~(1<<XT_CLOCK_BIT);
- XT_CLOCK_PORT |= (1<<XT_CLOCK_BIT);
- _delay_us(1);
- return XT_CLOCK_PIN&(1<<XT_CLOCK_BIT);
- }
-
- bool data_in(void)
- {
- XT_DATA_DDR &= ~(1<<XT_DATA_BIT);
- XT_DATA_PORT |= (1<<XT_DATA_BIT);
- _delay_us(1);
- return XT_DATA_PIN&(1<<XT_DATA_BIT);
- }
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