Andrew Bell
Dr cregans solution for keypad polling
Revision 0:d866ad9b15fb, committed 2021-02-20
- Comitter:
- andrewbw01
- Date:
- Sat Feb 20 13:22:01 2021 +0000
- Commit message:
- lab3 creg
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat Feb 20 13:22:01 2021 +0000
@@ -0,0 +1,218 @@
+#include "mbed.h"
+
+BusOut LED_Disp(p7,p11,p9,p8,p5,p6,p10,p12);
+
+
+
+DigitalOut col1 (p26); // pin 4 on keypad
+DigitalOut col2 (p28); // pin 2
+DigitalOut col3 (p24); // pin 6
+
+DigitalIn row1 (p27); // pin 3
+DigitalIn row2 (p22); // pin 8
+DigitalIn row3 (p23); // pin 7
+DigitalIn row4 (p25); // pin 5
+
+char keypad(void); // declare keypad function will return character pressed
+void DisplayNumber(int); // Declare functio to display number on seven seg
+
+int main()
+{
+ char kp_val = ' '; // character that changes when the key is pressed, has initial value
+
+ LED_Disp = 0xFF;
+
+ while(1)
+ {
+ kp_val = keypad();
+
+ if(kp_val!= ' ') // poll keypad and check if any value is pressed
+ {
+ if(kp_val=='*') LED_Disp = ~0x63;
+ if(kp_val=='#') LED_Disp = ~0x5C;
+
+ if(kp_val>='0' && kp_val<='9')
+ DisplayNumber(kp_val-48); // subtract 48 to change ASCII into number
+
+ kp_val=' '; // reset keypad_char
+ }
+ wait(0.1);
+ }
+}
+
+
+char keypad(void)
+{
+ col1=1;
+ col2=0;
+ col3=0;
+
+ if(row1==1)
+ {
+ while(row1==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('1');
+ }
+ else if(row2==1)
+ {
+ while (row2==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('4');
+ }
+ else if(row3==1)
+ {
+ while (row3==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('7');
+ }
+ else if(row4==1)
+ {
+ while(row4==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('*');
+ }
+
+ col1=0;
+ col2=1;
+ col3=0;
+
+ if(row1==1)
+ {
+ while(row1==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('2');
+ }
+ else if(row2==1)
+ {
+ while (row2==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('5');
+ }
+ else if(row3==1)
+ {
+ while (row3==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('8');
+ }
+ else if(row4==1)
+ {
+ while(row4==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('0');
+ }
+
+ col1=0;
+ col2=0;
+ col3=1;
+
+ if(row1==1)
+ {
+ while(row1==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('3');
+ }
+ else if(row2==1)
+ {
+ while (row2==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('6');
+ }
+ else if(row3==1)
+ {
+ while (row3==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('9');
+ }
+ else if (row4==1)
+ {
+ while(row4==1){}
+
+ col1=0;
+ col2=0;
+ col3=0;
+ return('#');
+ }
+
+ col1=0;
+ col2=0;
+ col3=0;
+
+ return(' ');
+}
+
+void DisplayNumber(int num)
+{
+ switch(num)
+ {
+ case 0:
+ LED_Disp = ~0x3F;
+ break;
+ case 1:
+ LED_Disp = ~0x06;
+ break;
+ case 2:
+ LED_Disp = ~0x5B;
+ break;
+ case 3:
+ LED_Disp = ~0x4F;
+ break;
+ case 4:
+ LED_Disp = ~0x66;
+ break;
+ case 5:
+ LED_Disp = ~0x6D;
+ break;
+ case 6:
+ LED_Disp = ~0x7D;
+ break;
+ case 7:
+ LED_Disp = ~0x07;
+ break;
+ case 8:
+ LED_Disp = ~0x7F;
+ break;
+ case 9:
+ LED_Disp = ~0x67;
+ break;
+ case 10: //#
+ LED_Disp = ~0x5c;
+ break;
+ case 11: //*
+ LED_Disp = ~0x63;
+ break;
+ }
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Feb 20 13:22:01 2021 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400 \ No newline at end of file