Diff: main.cpp

Revision:

0:96d06d836f68

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 28 03:00:43 2017 +0000
@@ -0,0 +1,104 @@
+#include "mbed.h"
+
+// C1, C2, C3, C4
+PinName pin_KEYPAD_C[4] = {PC_4, PC_5, PC_6, PC_7};
+// R1, R2, R3, R4
+PinName pin_KEYPAD_R[4] = {PC_8, PC_9, PC_10, PC_11};
+    
+DigitalInOut Keypad_C1(pin_KEYPAD_C[0]);
+DigitalInOut Keypad_C2(pin_KEYPAD_C[1]);
+DigitalInOut Keypad_C3(pin_KEYPAD_C[2]);
+DigitalInOut Keypad_C4(pin_KEYPAD_C[3]);
+
+char Key_value[16] = {'1', '2', '3', 'A', '4', '5', '6', 'B', '7', '8', '9', 'C', '*', '0', '#', 'D'}; 
+
+// R1, R2, R3, R4
+BusIn Keypad_R(pin_KEYPAD_R[0], pin_KEYPAD_R[1], pin_KEYPAD_R[2], pin_KEYPAD_R[3]);
+
+Serial SerialUART(PA_2, PA_3);
+
+uint16_t Keypad_Read(void);
+
+int main() {
+    uint16_t Keypad = 0, i;
+    SerialUART.baud(115200);
+    SerialUART.printf("\n\r Key pad Push");
+    
+    while(1) {
+        Keypad = Keypad_Read();
+        if(Keypad != 0)
+        {
+            SerialUART.printf("\n\r KeyPad : ");
+            for(i=0; i<16; i++)
+            {
+                if(Keypad & (0x0001 << i))
+                {
+                    SerialUART.printf(" %c Pushed",Key_value[i]);
+                    break;
+                }
+            }
+            wait(0.5);
+        }
+    }
+}
+
+//
+// bit   | 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
+// -------------------------------------------------------
+// value |  D  #  0  *  C  9  8  7  B  6  5  4  A  3  2  1
+//
+//  1  2  3  A
+//  4  5  6  B
+//  7  8  9  C
+//  *  0  #  D
+//
+uint16_t Keypad_Read(void)
+{
+    uint16_t keypad_tmp, Read_data = 0, i;
+    for(i=0; i<4; i++)
+    {
+        switch(i)
+        {
+            case 0:
+                Keypad_C1.output();
+                Keypad_C1 = 1;
+                break;
+            case 1:
+                Keypad_C2.output();
+                Keypad_C2 = 1;
+                break;
+            case 2:
+                Keypad_C3.output();
+                Keypad_C3 = 1;
+                break;
+            case 3:
+                Keypad_C4.output();
+                Keypad_C4 = 1;
+                break;
+        }
+        
+        wait(0.001);
+        keypad_tmp = Keypad_R;
+        Read_data |= (keypad_tmp << (i*4));
+        switch(i)
+        {
+            case 0:
+                Keypad_C1 = 0;
+                Keypad_C1.input();
+                break;
+            case 1:
+                Keypad_C2 = 0;
+                Keypad_C2.input();
+                break;
+            case 2:
+                Keypad_C3 = 0;
+                Keypad_C3.input();
+                break;
+            case 3:
+                Keypad_C4 = 0;
+                Keypad_C4.input();
+                break;
+        }
+    }
+    return Read_data;
+}
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