converter/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 "timer.h"
   7 #include "debug.h"
   8
   9 #define CLK_HI() (PORTD |=  (1<<0))
  10 #define CLK_LO() (PORTD &= ~(1<<0))
  11 #define STATE()  (!!(PIND & (1<<1)))
  12 #define RST_HI() (PORTD |=  (1<<3))
  13 #define RST_LO() (PORTD &= ~(1<<3))
  14 #define SENSE()  (PIND & (1<<2))
  15
  16 static matrix_row_t matrix[8] = {};
  17 static matrix_row_t matrix_debouncing[8] = {};
  18 static uint16_t debouncing_time = 0;
  19
  20
  21 void matrix_init(void)
  22 {
  23     debug_enable = true;
  24     debug_keyboard = true;
  25     debug_matrix = true;
  26
  27     // PD0: Clock. Counter couts up at falling edge.
  28     // PD1: Key State. Hi if selected key is activated.
  29     // PD2: Sense. Lo if any key is activated while Reset is Hi.
  30     // PD3: Reset. Resets counters at riging edge.
  31     DDRD  |=   (1<<3) | (1<<0);     // output
  32     DDRD  &= ~((1<<2) | (1<<1));    // input
  33     PORTD &= ~((1<<3) | (1<<0));    // low
  34     PORTD |=   (1<<2) | (1<<1);     // pull-up
  35
  36     dprintf("init\n");
  37 }
  38
  39 uint8_t matrix_scan(void)
  40 {
  41     // TODO: debouce & unplug detect
  42     // Reset counters
  43     RST_HI();
  44     wait_us(10);
  45     RST_LO();
  46     wait_us(10);
  47
  48     // 8x8 matrix:  row:sense, col:drive, key_on:hi
  49     for (uint8_t col = 0; col < 8; col++) {
  50         for (uint8_t row = 0; row < 8; row++) {
  51             CLK_HI();
  52             wait_us(10);
  53
  54             // detect state change and start debounce
  55             if ((matrix_debouncing[row] & (1<<col)) ^ (STATE()<<col)) {
  56                 matrix_debouncing[row] ^= (1<<col);
  57                 debouncing_time = timer_read() || 1;
  58             }
  59
  60             // proceed counter - next row
  61             CLK_LO();
  62             wait_us(10);
  63         }
  64     }
  65
  66     // debounced
  67     if (debouncing_time && timer_elapsed(debouncing_time) > DEBOUNCE) {
  68         for (int row = 0; row < MATRIX_ROWS; row++) {
  69             matrix[row] = matrix_debouncing[row];
  70         }
  71         debouncing_time = 0;
  72     }
  73     return 1;
  74 }
  75
  76 matrix_row_t matrix_get_row(uint8_t row)
  77 {
  78     return matrix[row];
  79 }
  80
  81 void led_set(uint8_t usb_led)
  82 {
  83 }