protocol/ps2_io_avr.c

   1 #include <stdbool.h>
   2 #include <util/delay.h>
   3
   4 /* Check port settings for clock and data line */
   5 #if !(defined(PS2_CLOCK_PORT) && \
   6       defined(PS2_CLOCK_PIN) && \
   7       defined(PS2_CLOCK_DDR) && \
   8       defined(PS2_CLOCK_BIT))
   9 #   error "PS/2 clock port setting is required in config.h"
  10 #endif
  11
  12 #if !(defined(PS2_DATA_PORT) && \
  13       defined(PS2_DATA_PIN) && \
  14       defined(PS2_DATA_DDR) && \
  15       defined(PS2_DATA_BIT))
  16 #   error "PS/2 data port setting is required in config.h"
  17 #endif
  18
  19
  20 /*
  21  * Clock
  22  */
  23 void clock_init(void)
  24 {
  25 }
  26
  27 void clock_lo(void)
  28 {
  29     PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT);
  30     PS2_CLOCK_DDR  |=  (1<<PS2_CLOCK_BIT);
  31 }
  32
  33 void clock_hi(void)
  34 {
  35     /* input with pull up */
  36     PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
  37     PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
  38 }
  39
  40 bool clock_in(void)
  41 {
  42     PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
  43     PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
  44     _delay_us(1);
  45     return PS2_CLOCK_PIN&(1<<PS2_CLOCK_BIT);
  46 }
  47
  48 /*
  49  * Data
  50  */
  51 void data_init(void)
  52 {
  53 }
  54
  55 void data_lo(void)
  56 {
  57     PS2_DATA_PORT &= ~(1<<PS2_DATA_BIT);
  58     PS2_DATA_DDR  |=  (1<<PS2_DATA_BIT);
  59 }
  60
  61 void data_hi(void)
  62 {
  63     /* input with pull up */
  64     PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
  65     PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
  66 }
  67
  68 bool data_in(void)
  69 {
  70     PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
  71     PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
  72     _delay_us(1);
  73     return PS2_DATA_PIN&(1<<PS2_DATA_BIT);
  74 }