button support

[my-code/arm.git] / betty / buttons.c

diff --git a/betty/buttons.c b/betty/buttons.c
new file mode 100644 (file)
index 0000000..ba76f8d
--- /dev/null
+++ b/betty/buttons.c
@@ -0,0 +1,97 @@
+/*
+ * buttons.c - button api
+ *
+ * author: hackbard@hackdaworld.org
+ *
+ */
+
+#include "buttons.h"
+
+void button_init(void) {
+
+       /* 
+        * select as input the following pins
+        *  - p0.30 : interrupt, wtf is the 'vw 3 p9'?
+        *  - p0.28, p0.27, p3.21, p3.20, p0.22, p0.13 : column select
+        *
+        *  select as output
+        *  - p2.18-p2.24 : the rows
+        */
+
+       // gpio, as is: p3.20, p3.21
+       PINSEL1&=~((1<<29)|(1<<28));    // p0.30
+       PINSEL1&=~((1<<25)|(1<<24));    // p0.28
+       PINSEL1&=~((1<<23)|(1<<22));    // p0.27
+       PINSEL1&=~((1<<13)|(1<<12));    // p0.22
+       PINSEL0&=~((1<<27)|(1<<26));    // p0.13
+       // ctrl databus for p2.18 - p2.24
+       PINSEL2&=(PINSEL2&(~((1<<5)|(1<<4))))|(1<<4);
+       // input
+       IODIR0&=~((1<<30)|(1<<28)|(1<<27)|(1<<22)|(1<<13));
+       IODIR3&=~((1<<21)|(1<<20));
+       // output + pull them high
+       IODIR2|=((1<<18)|(1<<19)|(1<<20)|(1<<21)|(1<<22)|(1<<23)|(1<<24));
+       IOSET2=((1<<18)|(1<<19)|(1<<20)|(1<<21)|(1<<22)|(1<<23)|(1<<24));
+}
+
+void button_select_row(u8 row) {
+
+       IOSET2=((1<<18)|(1<<19)|(1<<20)|(1<<21)|(1<<22)|(1<<23)|(1<<24));
+       if(row>6)
+               return;
+       IOCLR2=(1<<(18+row));
+}
+
+u8 button_get_event(u64 *keys,int retries) {
+
+       u8 row;
+       u8 offset;
+       u8 cnt;
+       u32 port0,port3;
+
+       *keys=0;
+       cnt=0;
+
+       while(retries--) {
+               /* rest counter */
+               offset=0;
+               /* rows */
+               for(row=0;row<7;row++) {
+                       /* select the row */
+                       button_select_row(row);
+                       /* scan the columns 6 */
+                       port0=IOPIN0;
+                       port3=IOPIN2;
+                       if(!(port0&(1<<28))) {
+                               *keys|=(1<<(offset+0));
+                               cnt+=1;
+                       }
+                       if(!(port0&(1<<27))) {
+                               *keys|=(1<<(offset+1));
+                               cnt+=1;
+                       }
+                       if(!(port0&(1<<22))) {
+                               *keys|=(1<<(offset+2));
+                               cnt+=1;
+                       }
+                       if(!(port0&(1<<13))) {
+                               *keys|=(1<<(offset+3));
+                               cnt+=1;
+                       }
+                       if(!(port3&(1<<21))) {
+                               *keys|=(1<<(offset+4));
+                               cnt+=1;
+                       }
+                       if(!(port3&(1<<20))) {
+                               *keys|=(1<<(offset+5));
+                               cnt+=1;
+                       }
+                       offset+=6;
+               }
+               if(*keys)
+                       break;
+       }
+
+       return cnt;
+}
+