Diff: main.cpp

Revision:

0:d4471c28adb6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Jul 14 10:52:52 2017 +0000
@@ -0,0 +1,98 @@
+#include "mbed.h"
+
+
+DigitalOut T1(PTA13); // base for digit #1
+DigitalOut T2(PTD5); // base for digit #2
+DigitalOut T3(PTD0); // base for digit #3
+DigitalOut T4(PTD2); // base for digit #4
+
+// digital bus to send 8bit code for each 7 seg through
+BusOut sseg(PTA1,PTC9,PTC8,PTA12,PTD4,PTA2,PTA4,PTA5);
+
+Ticker dtimer;
+
+
+//decoder for BCD to 7 segment =a-b-c-d-e-f-g-DP
+int sbits[12]={
+    0b11111100, //'0'
+    0b01100000, //'1'
+    0b11011010,  //'2'
+    0b11110010, //'3'
+    0b01100110, //'4'
+    0b10110110, //'5'
+    0b10111110, //'6'
+    0b11100000, //'7'
+    0b11111110, //'8'
+    0b11110110, //'9'
+    0b00000001  //'.' // decimal point
+    };
+    
+int disp[4]={0,1,2,3}; // variable to store the current display on
+
+int flash1(float tm){
+    T1=1;
+    wait(tm/2);
+    T1=0;
+    wait(tm/2);
+    return(1);
+    }
+    
+    
+int flash2(float tm){
+    T2=1;
+    wait(tm/2);
+    T2=0;
+    wait(tm/2);
+    return(1);
+    }
+    
+    int flash3(float tm){
+    T3=1;
+    wait(tm/2);
+    T3=0;
+    wait(tm/2);
+    return(1);
+    }
+    
+    int flash4(float tm){
+    T4=1;
+    wait(tm/2);
+    T4=0;
+    wait(tm/2);
+    return(1);
+    }
+    
+    // update the display with one cycle of flashes
+void dupdate(){
+            
+    sseg=~sbits[disp[0]];
+    flash1(0.001);
+    sseg=~sbits[disp[1]];
+    flash2(0.001);
+    sseg=~sbits[disp[2]];
+    flash3(0.001);
+    sseg=~sbits[disp[3]];
+    flash4(0.001);
+   
+    }
+
+// just cycle through leds in turn
+int main() {
+        dtimer.attach(&dupdate,0.01);
+        T1=1;
+    
+        wait(1);
+        int q;
+        while(1){
+        for(q=0;q<11;q++){
+           
+                disp[0]=q;
+                disp[1]=(q+1)%10;
+                disp[2]=(q+2)%10;
+                disp[3]=(q+3)%10;
+       wait(1);
+            
+        }
+        
+    }
+}
\ No newline at end of file