betty/buttons.c

   1 /*
   2  * buttons.c - button api
   3  *
   4  * author: hackbard@hackdaworld.org
   5  *
   6  */
   7
   8 #include "buttons.h"
   9
  10 void button_init(t_button *button) {
  11
  12         /*
  13          * select as input the following pins
  14          *  - p0.30 : interrupt! wtf is the 'vw 3 p9'?
  15          *  - p0.28, p0.27, p3.21, p3.20, p0.22, p0.13 : column select
  16          *
  17          *  select as output
  18          *  - p2.18-p2.24 : the rows
  19          */
  20
  21         // gpio, as is: p3.20, p3.21
  22         PINSEL1&=~((1<<29)|(1<<28));    // p0.30
  23         PINSEL1&=~((1<<25)|(1<<24));    // p0.28
  24         PINSEL1&=~((1<<23)|(1<<22));    // p0.27
  25         PINSEL1&=~((1<<13)|(1<<12));    // p0.22
  26         PINSEL0&=~((1<<27)|(1<<26));    // p0.13
  27
  28         // ctrl databus for p2.18 - p2.24
  29         PINSEL2&=(PINSEL2&(~((1<<5)|(1<<4))))|(1<<4);
  30
  31         // ctrl addr bus for p3.20, p3.21
  32         PINSEL2=(PINSEL2&(~((1<<27)|(1<<26)|(1<<25))))|(1<<27)|(1<<26);
  33
  34         // input
  35         IODIR0&=~((1<<30)|(1<<28)|(1<<27)|(1<<22)|(1<<13));
  36         IODIR3&=~((1<<21)|(1<<20));
  37
  38         // output + pull them high
  39         IODIR2|=((1<<18)|(1<<19)|(1<<20)|(1<<21)|(1<<22)|(1<<23)|(1<<24));
  40         IOSET2=((1<<18)|(1<<19)|(1<<20)|(1<<21)|(1<<22)|(1<<23)|(1<<24));
  41
  42         /* poll / interrupt mode */
  43         if(button->mode&BUTTON_INT) {
  44         }
  45         else if(button->mode&BUTTON_POLL) {
  46         }
  47 }
  48
  49 void button_set_retries(t_button *button,int retries) {
  50
  51         button->retries=retries;
  52 }
  53
  54 #define BUTTON_RESET \
  55         IOSET2=((1<<18)|(1<<19)|(1<<20)|(1<<21)|(1<<22)|(1<<23)|(1<<24))
  56
  57 void button_select_row(u8 row) {
  58
  59         BUTTON_RESET;
  60         if(row>6)
  61                 return;
  62         IOCLR2=(1<<(18+row));
  63 }
  64
  65 #define COUNT_AND_CHECK         cnt++; \
  66                                 if(cnt==BUTTON_MAX) \
  67                                         break
  68
  69 u8 button_get_event(t_button *button) {
  70
  71         u8 row;
  72         u8 offset;
  73         u8 cnt;
  74         u32 port0,port3;
  75         u8 retries;
  76
  77         cnt=0;
  78         retries=button->retries;
  79
  80         while(retries--) {
  81                 /* rest offset counter */
  82                 offset=0;
  83                 /* rows */
  84                 for(row=0;row<7;row++) {
  85                         /* select the row */
  86                         button_select_row(row);
  87                         /* scan the columns 6 */
  88                         port0=IOPIN0;
  89                         port3=IOPIN3;
  90                         if(!(port0&(1<<28))) {
  91                                 button->key[cnt]=offset+0;
  92                                 COUNT_AND_CHECK;
  93                         }
  94                         if(!(port0&(1<<27))) {
  95                                 button->key[cnt]=offset+1;
  96                                 COUNT_AND_CHECK;
  97                         }
  98                         if(!(port0&(1<<22))) {
  99                                 button->key[cnt]=offset+2;
 100                                 COUNT_AND_CHECK;
 101                         }
 102                         if(!(port0&(1<<13))) {
 103                                 button->key[cnt]=offset+3;
 104                                 COUNT_AND_CHECK;
 105                         }
 106                         if(!(port3&(1<<21))) {
 107                                 button->key[cnt]=offset+4;
 108                                 COUNT_AND_CHECK;
 109                         }
 110                         if(!(port3&(1<<20))) {
 111                                 button->key[cnt]=offset+5;
 112                                 COUNT_AND_CHECK;
 113                         }
 114                         offset+=6;
 115                 }
 116                 if(cnt)
 117                         break;
 118         }
 119
 120         BUTTON_RESET;
 121         button->cnt=cnt;
 122
 123         return cnt;
 124 }
 125