diff options
Diffstat (limited to 'Lab3.X/numpad.c')
| -rw-r--r-- | Lab3.X/numpad.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/Lab3.X/numpad.c b/Lab3.X/numpad.c index fcd87cc..271b324 100644 --- a/Lab3.X/numpad.c +++ b/Lab3.X/numpad.c @@ -7,3 +7,98 @@ void initKeyPad(void) { CNPU1bits.CN13PUE = 1;
CNPU1bits.CN14PUE = 1;
}
+void padDelay(long n) {
+ for (n=n; n>0; n--) {
+ asm("nop");
+ }
+}
+// 1 2 3 4 5 6 7 8
+// RA0 RA1 RA2 RA3 RB15 RB14 RB13 RB12
+char readKeyPadRAW(void) {
+ int i;
+ char num;
+ num = (!_RB15 << 3) | (!_RB14 << 2) | (!_RB13 << 1) | !_RB12;
+ LATB |= (0b1111 << 12);
+ for (i = 0; i < 4; i++) {
+ LATB ^= 0b1 << (15 - i);
+ padDelay(10);
+ switch (i) {
+ case 0:
+ switch (num) {
+ case 0b1110:
+ return 'A';
+ break;
+ case 0b1101:
+ return '3';
+ break;
+ case 0b1011:
+ return '2';
+ break;
+ case 0b111:
+ return '1';
+ break;
+ } break;
+ case 1:
+ switch (num) {
+ case 0b1110:
+ return 'b';
+ break;
+ case 0b1101:
+ return '6';
+ break;
+ case 0b1011:
+ return '5';
+ break;
+ case 0b111:
+ return '4';
+ break;
+ } break;
+ case 2:
+ switch (num) {
+ case 0b1110:
+ return 'C';
+ break;
+ case 0b1101:
+ return '9';
+ break;
+ case 0b1011:
+ return '8';
+ break;
+ case 0b111:
+ return '7';
+ break;
+ } break;
+ case 3:
+ switch (num) {
+ case 0b1110:
+ return 'd';
+ break;
+ case 0b1101:
+ return 'E';
+ break;
+ case 0b1011:
+ return '0';
+ break;
+ case 0b111:
+ return 'F';
+ break;
+ } break;
+ } //END switch(i);
+ LATB |= (0b1111 << 12);
+ }
+ return '\0';
+}
+/*
+Outputs<8:5> = 0b0111; // Set Row 1 output Low
+delay(1us); // this delay could be lower, probably 2-3 cycles
+RowOne = Inputs<4:1>; // returns 0b1111 (no buttons pressed in row 1)
+
+Outputs<8:5> = 0b1011; // Set Row 2 output Low
+delay(1us);
+RowTwo = Inputs<4:1>; // returns 0b1101 (the ?6? key was pressed!)
+...
+Outputs<8:5> = 0b1110; // Set Row 4 output Low
+delay(1us);
+RowFour = Inputs<4:1>; // returns 0b1111 (no buttons pressed in row 4)
+
+ */
\ No newline at end of file |