keyboard/pana_m8/pana_m8.c

   1 #include <avr/io.h>
   2 #include <avr/pgmspace.h>
   3 #include "matrix.h"
   4 #include "led.h"
   5 #include "wait.h"
   6 #include "debug.h"
   7
   8 #define CLK_HI() (PORTD |=  (1<<0))
   9 #define CLK_LO() (PORTD &= ~(1<<0))
  10 #define STATE()  (PIND & (1<<1))
  11 #define RST_HI() (PORTD |=  (1<<3))
  12 #define RST_LO() (PORTD &= ~(1<<3))
  13 #define SENSE()  (PIND & (1<<2))
  14
  15 static matrix_row_t matrix[8] = {};
  16
  17
  18 void matrix_init(void)
  19 {
  20     debug_enable = true;
  21     debug_keyboard = true;
  22     debug_matrix = true;
  23
  24     // PD0: Clock. Counter couts up at falling edge.
  25     // PD1: Key State. Hi if selected key is activated.
  26     // PD2: Sense. Lo if any key is activated while Reset is Hi.
  27     // PD3: Reset. Resets counters at riging edge.
  28     DDRD  |=   (1<<3) | (1<<0);     // output
  29     DDRD  &= ~((1<<2) | (1<<1));    // input
  30     PORTD &= ~((1<<3) | (1<<0));    // low
  31     PORTD |=   (1<<2) | (1<<1);     // pull-up
  32
  33     dprintf("init\n");
  34 }
  35
  36 uint8_t matrix_scan(void)
  37 {
  38     // TODO: debouce & unplug detect
  39     // Reset counters
  40     RST_HI();
  41     wait_us(10);
  42     RST_LO();
  43     wait_us(10);
  44
  45     // 8x8 matrix:  row:sense, col:drive, key_on:hi
  46     for (uint8_t col = 0; col < 8; col++) {
  47         for (uint8_t row = 0; row < 8; row++) {
  48             CLK_HI();
  49             wait_us(10);
  50
  51             if (STATE()) {
  52                 matrix[row] |=  (1<<col);
  53             } else {
  54                 matrix[row] &= ~(1<<col);
  55             }
  56
  57             // proceed counter - next row
  58             CLK_LO();
  59             wait_us(10);
  60         }
  61     }
  62     return 1;
  63 }
  64
  65 matrix_row_t matrix_get_row(uint8_t row)
  66 {
  67     return matrix[row];
  68 }
  69
  70 void led_set(uint8_t usb_led)
  71 {
  72 }