Revision 0:0c232b9b32bb, committed 2020-09-28

Comitter:

mygore

Date:

Mon Sep 28 18:46:41 2020 +0000

Commit message:

Lab4 pizza

Changed in this revision

diff -r 000000000000 -r 0c232b9b32bb main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Sep 28 18:46:41 2020 +0000
@@ -0,0 +1,108 @@
+#include "mbed.h"      
+
+DigitalOut ROW1(PA_0);
+DigitalOut ROW2(PA_5);
+DigitalOut ROW3(PA_1); 
+DigitalOut ROW4(PA_2);
+DigitalOut led1(LED1);
+
+DigitalIn COL1(PA_3, PullUp); 
+DigitalIn COL2(PB_6, PullUp);
+DigitalIn COL3(PB_7, PullUp);
+DigitalIn COL4(PD_0, PullUp);
+
+unsigned char keypad_scan(void);
+int col_scan(void);
+
+int main()
+{
+    int row, col;
+    while(1)
+    {
+    unsigned char key1_map = keypad_scan();
+    printf("%c", key1_map); 
+    }
+}
+
+unsigned char keypad_scan(void)
+{
+    unsigned char key_map [4][4] =
+    {
+        {'1', '2', '3','A'},
+        {'4', '5', '6', 'B'},
+        {'7', '8', '9', 'C'},
+        {'*', '0', '#', 'D'},
+    };
+    int row, col;
+    unsigned char key = 0xFF; 
+    
+    for(row =0; row<4; row++)
+    {
+        ROW1 = 1;
+        ROW2 = 1;
+        ROW3 = 1;
+        ROW4 = 1;
+        if(row == 0)
+        {
+            ROW1 = 0;
+            wait(0.005);
+            col = col_scan();
+            wait(0.005);
+        }
+        else if(row == 1)
+        {
+            ROW2 = 0;
+            wait(0.005);
+            col = col_scan();
+            wait(0.005);
+        }
+        else if(row == 2)
+        {
+            ROW3 = 0;
+            wait(0.005);
+            col = col_scan();
+            wait(0.005);
+        }
+        else if(row == 3)
+        {
+            ROW4 = 0;
+            wait(0.005);
+            col = col_scan();
+            wait(0.005);
+        }
+        else
+        {
+            return key;
+        }   
+    }
+    if(col == 0 || col == 1 || col == 2 || col == 3)
+        {
+            return key_map[row][col];
+        }
+    return key;
+}
+
+int col_scan(void)
+{
+    unsigned char key = 0xFF;
+    if(COL1 == 0)
+    {
+        return 0;
+    }
+    else if(COL2 == 0)
+    {
+        return 1;
+    }
+    else if(COL3 == 0)
+    {
+        return 2;
+    }
+    else if(COL4 == 0)
+    {
+        return 3;
+    }
+    else
+    {
+        return key;
+    }   
+}
\ No newline at end of file

diff -r 000000000000 -r 0c232b9b32bb mbed-os.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Mon Sep 28 18:46:41 2020 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#b81aeff1a3e171c6421984faa2cc18d0e35746c0