tmk_core/protocol/xt_io_avr.c

   1 #include <stdbool.h>
   2 #include <avr/io.h>
   3 #include <util/delay.h>
   4
   5 /* Check port settings for clock and data line */
   6 #if !(defined(XT_CLOCK_PORT) && \
   7       defined(XT_CLOCK_PIN) && \
   8       defined(XT_CLOCK_DDR) && \
   9       defined(XT_CLOCK_BIT))
  10 #   error "XT clock port setting is required in config.h"
  11 #endif
  12
  13 #if !(defined(XT_DATA_PORT) && \
  14       defined(XT_DATA_PIN) && \
  15       defined(XT_DATA_DDR) && \
  16       defined(XT_DATA_BIT))
  17 #   error "XT data port setting is required in config.h"
  18 #endif
  19
  20 bool clock_in(void)
  21 {
  22     XT_CLOCK_DDR  &= ~(1<<XT_CLOCK_BIT);
  23     XT_CLOCK_PORT |=  (1<<XT_CLOCK_BIT);
  24     _delay_us(1);
  25     return XT_CLOCK_PIN&(1<<XT_CLOCK_BIT);
  26 }
  27
  28 bool data_in(void)
  29 {
  30     XT_DATA_DDR  &= ~(1<<XT_DATA_BIT);
  31     XT_DATA_PORT |=  (1<<XT_DATA_BIT);
  32     _delay_us(1);
  33     return XT_DATA_PIN&(1<<XT_DATA_BIT);
  34 }