betty/buttons.c

   1 /*
   2  * buttons.c - button api
   3  *
   4  * author: hackbard@hackdaworld.org
   5  *
   6  */
   7
   8 #include "buttons.h"
   9
  10 #define BUTTON_RESET \
  11         IOSET2=((1<<18)|(1<<19)|(1<<20)|(1<<21)|(1<<22)|(1<<23)|(1<<24))
  12
  13 #define COUNT_AND_CHECK         cnt++; \
  14                                 if(cnt==BUTTON_MAX) \
  15                                         break
  16
  17 void button_init(t_button *button) {
  18
  19         /*
  20          * input:
  21          *  - p0.30 : interrupt! wtf is the 'vw 3 p9'? a transistor?
  22          *  - p0.28, p0.27, p3.21, p3.20, p0.22, p0.13 : the columns
  23          *
  24          * output:
  25          *  - p2.18-p2.24 : the rows
  26          */
  27
  28         BUTTON_RESET;
  29
  30         /* poll / interrupt mode */
  31         if(button->mode&BUTTON_INT) {
  32         }
  33         else if(button->mode&BUTTON_POLL) {
  34         }
  35 }
  36
  37 void button_set_retries(t_button *button,int retries) {
  38
  39         button->retries=retries;
  40 }
  41
  42 void button_select_row(u8 row) {
  43
  44         BUTTON_RESET;
  45         if(row>6)
  46                 return;
  47         IOCLR2=(1<<(18+row));
  48 }
  49
  50 u8 button_get_event(t_button *button) {
  51
  52         u8 row;
  53         u8 offset;
  54         u8 cnt;
  55         u32 port0,port3;
  56         u8 retries;
  57
  58         cnt=0;
  59         retries=button->retries;
  60
  61         while(retries--) {
  62                 /* rest offset counter */
  63                 offset=0;
  64                 /* rows */
  65                 for(row=0;row<7;row++) {
  66                         /* select the row */
  67                         button_select_row(row);
  68                         /* scan the columns 6 */
  69                         port0=IOPIN0;
  70                         port3=IOPIN3;
  71                         if(!(port0&(1<<28))) {
  72                                 button->key[cnt]=offset+0;
  73                                 COUNT_AND_CHECK;
  74                         }
  75                         if(!(port0&(1<<27))) {
  76                                 button->key[cnt]=offset+1;
  77                                 COUNT_AND_CHECK;
  78                         }
  79                         if(!(port0&(1<<22))) {
  80                                 button->key[cnt]=offset+2;
  81                                 COUNT_AND_CHECK;
  82                         }
  83                         if(!(port0&(1<<13))) {
  84                                 button->key[cnt]=offset+3;
  85                                 COUNT_AND_CHECK;
  86                         }
  87                         if(!(port3&(1<<21))) {
  88                                 button->key[cnt]=offset+4;
  89                                 COUNT_AND_CHECK;
  90                         }
  91                         if(!(port3&(1<<20))) {
  92                                 button->key[cnt]=offset+5;
  93                                 COUNT_AND_CHECK;
  94                         }
  95                         offset+=6;
  96                 }
  97                 if(cnt)
  98                         break;
  99         }
 100
 101         BUTTON_RESET;
 102         button->cnt=cnt;
 103
 104         return cnt;
 105 }
 106