Motoo Tanaka
A simple 4x4 matrix key pad test program
Revision 1:be0aa2900453, committed 2017-05-11
- Comitter:
- Rhyme
- Date:
- Thu May 11 01:29:58 2017 +0000
- Parent:
- 0:a05c97d07ea7
- Child:
- 2:bac691bab19c
- Commit message:
- First commit
Changed in this revision
| main.cpp | Show diff for this revision Revisions of this file |
| matrix_key_4x4.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Wed Apr 12 13:26:04 2017 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,95 +0,0 @@
-#include "mbed.h"
-
-#if defined (TARGET_KL25Z)
-#define ROW0 PTC9
-#define ROW1 PTC8
-#define ROW2 PTA5
-#define ROW3 PTA4
-#define COL0 PTA12
-#define COL1 PTD4
-#define COL2 PTA1
-#define COL3 PTA2
-#endif
-
-#define NUM_COL 4
-#define NUM_ROW 4
-#define NUM_KEY (NUM_COL * NUM_ROW)
-
-int key[ NUM_KEY ] = {
- 0, 0, 0, 0,
- 0, 0, 0, 0,
- 0, 0, 0, 0,
- 0, 0, 0, 0
-} ;
-
-unsigned char key_char[NUM_KEY] = {
- '1', '4', '7', '*',
- '2', '5', '8', '0',
- '3', '6', '9', '#',
- 'A', 'B', 'C', 'D'
-} ;
-
-
-DigitalIn *col[NUM_COL] ;
-DigitalOut *row[NUM_ROW] ;
-
-void init_hardware(void)
-{
- col[3] = new DigitalIn(PTC11, PullUp) ;
- col[2] = new DigitalIn(PTC10, PullUp) ;
- col[1] = new DigitalIn(PTC6, PullUp) ;
- col[0] = new DigitalIn(PTC5, PullUp) ;
-
- row[3] = new DigitalOut(PTC4, 1) ;
- row[2] = new DigitalOut(PTC3, 1) ;
- row[1] = new DigitalOut(PTC0, 1) ;
- row[0] = new DigitalOut(PTC7, 1) ;
-}
-
-int scan_key(int key[])
-{
- int r, c ;
- int count = 0 ;
-
- for (r = 0 ; r < NUM_ROW ; r++ ) {
- row[r]->write(0) ;
- for (c = 0 ; c < NUM_COL ; c++ ) {
- if (col[c]->read() == 0) {
- key[r * NUM_COL + c] = 1 ;
- count++ ;
- } else {
- key[r * NUM_COL + c] = 0 ;
- }
- }
- row[r]->write(1) ;
- }
- return(count) ;
-}
-
-void print_key(int key[])
-{
- int i ;
- for (i = 0 ; i < NUM_KEY ; i++ ) {
- if (key[i]) {
- printf("%c", key_char[i]) ;
- }
- }
-}
-
-int main() {
- int count ;
-
- init_hardware() ;
-
- printf("\n=== Matrix Key Test %s ===\n", __DATE__) ;
-
- while(1) {
- count = scan_key(key) ;
- if (count) {
- print_key(key) ;
- fflush(stdout) ;
- wait(0.2) ;
- }
- wait(0.1) ;
- }
-}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/matrix_key_4x4.cpp Thu May 11 01:29:58 2017 +0000
@@ -0,0 +1,101 @@
+/**
+ * matrix key scan program
+ *
+ * @note assuming key pad of 16 keys
+ * @note 4 x 4 matrix scan
+ */
+#include "mbed.h"
+
+#if defined (TARGET_KL25Z)
+#define ROW0 PTC9
+#define ROW1 PTC8
+#define ROW2 PTA5
+#define ROW3 PTA4
+#define COL0 PTA12
+#define COL1 PTD4
+#define COL2 PTA1
+#define COL3 PTA2
+#endif
+
+#define NUM_COL 4
+#define NUM_ROW 4
+#define NUM_KEY (NUM_COL * NUM_ROW)
+
+int key[ NUM_KEY ] = {
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0
+} ;
+
+unsigned char key_char[NUM_KEY] = {
+ '1', '4', '7', '*',
+ '2', '5', '8', '0',
+ '3', '6', '9', '#',
+ 'A', 'B', 'C', 'D'
+} ;
+
+
+DigitalIn *col[NUM_COL] ;
+DigitalOut *row[NUM_ROW] ;
+
+void init_hardware(void)
+{
+ col[3] = new DigitalIn(PTC11, PullUp) ;
+ col[2] = new DigitalIn(PTC10, PullUp) ;
+ col[1] = new DigitalIn(PTC6, PullUp) ;
+ col[0] = new DigitalIn(PTC5, PullUp) ;
+
+ row[3] = new DigitalOut(PTC4, 1) ;
+ row[2] = new DigitalOut(PTC3, 1) ;
+ row[1] = new DigitalOut(PTC0, 1) ;
+ row[0] = new DigitalOut(PTC7, 1) ;
+}
+
+int scan_key(int key[])
+{
+ int r, c ;
+ int count = 0 ;
+
+ for (r = 0 ; r < NUM_ROW ; r++ ) {
+ row[r]->write(0) ;
+ for (c = 0 ; c < NUM_COL ; c++ ) {
+ if (col[c]->read() == 0) {
+ key[r * NUM_COL + c] = 1 ;
+ count++ ;
+ } else {
+ key[r * NUM_COL + c] = 0 ;
+ }
+ }
+ row[r]->write(1) ;
+ }
+ return(count) ;
+}
+
+void print_key(int key[])
+{
+ int i ;
+ for (i = 0 ; i < NUM_KEY ; i++ ) {
+ if (key[i]) {
+ printf("%c", key_char[i]) ;
+ }
+ }
+}
+
+int main() {
+ int count ;
+
+ init_hardware() ;
+
+ printf("\n=== Matrix Key Test %s ===\n", __DATE__) ;
+
+ while(1) {
+ count = scan_key(key) ;
+ if (count) {
+ print_key(key) ;
+ fflush(stdout) ;
+ wait(0.2) ;
+ }
+ wait(0.1) ;
+ }
+}