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- /*
- Copyright 2014 Jun WAKO <[email protected]>
- */
- #ifndef IBM4704_H
- #define IBM4704_H
-
- #define IBM4704_ERR_NONE 0
- #define IBM4704_ERR_PARITY 0x70
-
-
- void ibm4704_init(void);
- uint8_t ibm4704_send(uint8_t data);
- uint8_t ibm4704_recv_response(void);
- uint8_t ibm4704_recv(void);
-
-
- /* Check pin configuration */
- #if !(defined(IBM4704_CLOCK_PORT) && \
- defined(IBM4704_CLOCK_PIN) && \
- defined(IBM4704_CLOCK_DDR) && \
- defined(IBM4704_CLOCK_BIT))
- # error "ibm4704 clock pin configuration is required in config.h"
- #endif
-
- #if !(defined(IBM4704_DATA_PORT) && \
- defined(IBM4704_DATA_PIN) && \
- defined(IBM4704_DATA_DDR) && \
- defined(IBM4704_DATA_BIT))
- # error "ibm4704 data pin configuration is required in config.h"
- #endif
-
-
- /*--------------------------------------------------------------------
- * static functions
- *------------------------------------------------------------------*/
- static inline void clock_lo(void)
- {
- IBM4704_CLOCK_PORT &= ~(1<<IBM4704_CLOCK_BIT);
- IBM4704_CLOCK_DDR |= (1<<IBM4704_CLOCK_BIT);
- }
- static inline void clock_hi(void)
- {
- /* input with pull up */
- IBM4704_CLOCK_DDR &= ~(1<<IBM4704_CLOCK_BIT);
- IBM4704_CLOCK_PORT |= (1<<IBM4704_CLOCK_BIT);
- }
- static inline bool clock_in(void)
- {
- IBM4704_CLOCK_DDR &= ~(1<<IBM4704_CLOCK_BIT);
- IBM4704_CLOCK_PORT |= (1<<IBM4704_CLOCK_BIT);
- _delay_us(1);
- return IBM4704_CLOCK_PIN&(1<<IBM4704_CLOCK_BIT);
- }
- static inline void data_lo(void)
- {
- IBM4704_DATA_PORT &= ~(1<<IBM4704_DATA_BIT);
- IBM4704_DATA_DDR |= (1<<IBM4704_DATA_BIT);
- }
- static inline void data_hi(void)
- {
- /* input with pull up */
- IBM4704_DATA_DDR &= ~(1<<IBM4704_DATA_BIT);
- IBM4704_DATA_PORT |= (1<<IBM4704_DATA_BIT);
- }
- static inline bool data_in(void)
- {
- IBM4704_DATA_DDR &= ~(1<<IBM4704_DATA_BIT);
- IBM4704_DATA_PORT |= (1<<IBM4704_DATA_BIT);
- _delay_us(1);
- return IBM4704_DATA_PIN&(1<<IBM4704_DATA_BIT);
- }
-
- static inline uint16_t wait_clock_lo(uint16_t us)
- {
- while (clock_in() && us) { asm(""); _delay_us(1); us--; }
- return us;
- }
- static inline uint16_t wait_clock_hi(uint16_t us)
- {
- while (!clock_in() && us) { asm(""); _delay_us(1); us--; }
- return us;
- }
- static inline uint16_t wait_data_lo(uint16_t us)
- {
- while (data_in() && us) { asm(""); _delay_us(1); us--; }
- return us;
- }
- static inline uint16_t wait_data_hi(uint16_t us)
- {
- while (!data_in() && us) { asm(""); _delay_us(1); us--; }
- return us;
- }
-
- /* idle state that device can send */
- static inline void idle(void)
- {
- clock_hi();
- data_hi();
- }
-
- /* inhibit device to send
- * keyboard checks Data line on start bit(Data:hi) and it stops sending if Data line is low.
- */
- static inline void inhibit(void)
- {
- clock_hi();
- data_lo();
- }
-
- #endif
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