protocol/ps2_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(PS2_CLOCK_PORT) && \
   7       defined(PS2_CLOCK_PIN) && \
   8       defined(PS2_CLOCK_DDR) && \
   9       defined(PS2_CLOCK_BIT))
  10 #   error "PS/2 clock port setting is required in config.h"
  11 #endif
  12
  13 #if !(defined(PS2_DATA_PORT) && \
  14       defined(PS2_DATA_PIN) && \
  15       defined(PS2_DATA_DDR) && \
  16       defined(PS2_DATA_BIT))
  17 #   error "PS/2 data port setting is required in config.h"
  18 #endif
  19
  20
  21 /*
  22  * Clock
  23  */
  24 void clock_init(void)
  25 {
  26 }
  27
  28 void clock_lo(void)
  29 {
  30     PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT);
  31     PS2_CLOCK_DDR  |=  (1<<PS2_CLOCK_BIT);
  32 }
  33
  34 void clock_hi(void)
  35 {
  36     /* input with pull up */
  37     PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
  38     PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
  39 }
  40
  41 bool clock_in(void)
  42 {
  43     PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
  44     PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
  45     _delay_us(1);
  46     return PS2_CLOCK_PIN&(1<<PS2_CLOCK_BIT);
  47 }
  48
  49 /*
  50  * Data
  51  */
  52 void data_init(void)
  53 {
  54 }
  55
  56 void data_lo(void)
  57 {
  58     PS2_DATA_PORT &= ~(1<<PS2_DATA_BIT);
  59     PS2_DATA_DDR  |=  (1<<PS2_DATA_BIT);
  60 }
  61
  62 void data_hi(void)
  63 {
  64     /* input with pull up */
  65     PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
  66     PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
  67 }
  68
  69 bool data_in(void)
  70 {
  71     PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
  72     PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
  73     _delay_us(1);
  74     return PS2_DATA_PIN&(1<<PS2_DATA_BIT);
  75 }