X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Farm.git;a=blobdiff_plain;f=betty%2Fbuttons.c;fp=betty%2Fbuttons.c;h=ba76f8db90d59a87c2b06076c098256c6d595908;hp=0000000000000000000000000000000000000000;hb=60432148802391c2ba390e9c56f999514653c969;hpb=def8902c1681a94ccb70d90cc855aedbc6a9e918

diff --git a/betty/buttons.c b/betty/buttons.c
new file mode 100644
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;
+}
+