Aslam Ahamed
PCF8574 I2C to GPIO interface IC to 4x4 matrix keypad and access the 16 keys for different purposes
Revision 0:a12361c5f212, committed 2015-05-20
- Comitter:
- aslam
- Date:
- Wed May 20 10:34:30 2015 +0000
- Commit message:
- PCF8574 interface IC (I2C to GPIO) to 4x4 matrix keypad
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/PCF8574.lib Wed May 20 10:34:30 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/simon/code/PCF8574/#ec8da0c59403
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed May 20 10:34:30 2015 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+#include "PCF8574.h"
+
+#define BAUD 9600
+InterruptIn event(p12);
+Serial pc(USBTX, USBRX);
+PCF8574 io(p9,p10,0x40);
+int data1 , data2;
+
+void display(int data)
+{
+switch (data)
+{
+ case 238: pc.printf("SW1 \n\r"); break;
+ case 237: pc.printf("SW2 \n\r"); break;
+ case 235: pc.printf("SW3 \n\r"); break;
+ case 231: pc.printf("SW4 \n\r"); break;
+ case 222: pc.printf("SW5 \n\r"); break;
+ case 221: pc.printf("SW6 \n\r"); break;
+ case 219: pc.printf("SW7 \n\r"); break;
+ case 215: pc.printf("SW8 \n\r"); break;
+ case 190: pc.printf("SW9 \n\r"); break;
+ case 189: pc.printf("SW10 \n\r"); break;
+ case 187: pc.printf("SW11 \n\r"); break;
+ case 183: pc.printf("SW12 \n\r"); break;
+ case 126: pc.printf("SW13 \n\r"); break;
+ case 125: pc.printf("SW14 \n\r"); break;
+ case 123: pc.printf("SW15 \n\r"); break;
+ case 119: pc.printf("SW16 \n\r"); break;
+ }
+}
+
+ void trigger()
+ {
+ //event.fall(NULL);
+ //printf("triggered!\n");
+ io.write(0x0f);
+ data1 = io.read();
+
+ io.write(0xf0);
+ data2 = io.read();
+
+ display(data1+data2);
+ //wait(0.2);
+ //event.fall(&trigger);
+ }
+
+int main()
+{
+ pc.printf("Start\n\r");
+ event.fall(&trigger);
+ //event.rise(&trigger);
+ while(1)
+ {
+
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed May 20 10:34:30 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/029aa53d7323