Tom Davies
Basic code for multiplexing LU-3011 11 Digit 7 Segment Display
Diff: main.cpp
- Revision:
- 0:61e6eaba7852
- Child:
- 1:763fde365f8e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Oct 07 02:26:38 2011 +0000
@@ -0,0 +1,421 @@
+//
+// LU-3011 11 Digit 7 Segment Display
+// v0.1 06/10/11
+// Uses ticker to muliplex display to show whole numbers
+// Maybe more efficient way to code switch/case segment?
+// Doesn't currently handle decimal point - whole numbers only
+//
+
+#include "mbed.h"
+
+//Prototypes
+void dispNumDig (int num, int digit);
+void upDisp (void);
+void updateDisp (int num, int digit);
+void showNum(unsigned int num);
+
+
+//Globals
+int dispArray[15]; // Holds Displayed Value
+int dispArrayIndex = 0; // Used to cycle digits displayed by ticker
+
+Ticker pov; // Ticker Interrupt
+Serial pc(USBTX,USBRX); // Default PC Comms
+DigitalOut myled(LED1); // Onboard LED for debug
+
+// 7 Segment Display - PCB Connections
+// Digits
+DigitalOut D11(p7); //PCB Pin 1 - Digit 11
+DigitalOut D10(p30); //PCB Pin 2
+DigitalOut D9(p29); //PCB Pin 3
+DigitalOut D8(p28); //PCB Pin 4
+DigitalOut D7(p26); //PCB Pin 6
+DigitalOut D6(p24); //PCB Pin 8
+DigitalOut D5(p22); //PCB Pin 10
+DigitalOut D4(p20); //PCB Pin 12
+DigitalOut D3(p18); //PCB Pin 14
+DigitalOut D2(p16); //PCB Pin 16
+DigitalOut D1(p14); //PCB Pin 18
+
+// Segments
+DigitalOut SP(p27); //PCB Pin 5 - Segment Decimal Point
+DigitalOut SA(p21); //PCB Pin 11 - Segment A
+DigitalOut SB(p13); //PCB Pin 19
+DigitalOut SC(p25); //PCB Pin 7
+DigitalOut SD(p17); //PCB Pin 15
+DigitalOut SE(p23); //PCB Pin 9
+DigitalOut SF(p15); //PCB Pin 17
+DigitalOut SG(p19); //PCB Pin 13
+
+////////////////////////////////////////////////
+
+int main()
+{
+ pov.attach_us(&upDisp, 100); // Function called (upDisp) by ticker(POV), interval (100uS)
+
+ while (1)
+ {
+ myled = 1;
+ wait(0.2);
+ myled = 0;
+ wait(0.2);
+
+ // Quick check - wiring and code correct
+ updateDisp (1, 11); //number, digit
+ updateDisp (2, 10); //Directly updating array through function
+ updateDisp (3, 9);
+ updateDisp (4, 8);
+ updateDisp (5, 7);
+ updateDisp (6, 6);
+ updateDisp (7, 5);
+ updateDisp (8, 4);
+ updateDisp (9, 3);
+ updateDisp (0, 2);
+ updateDisp (1, 1);
+ wait(2);
+
+ for(int i=0;i<12;i++)
+ {
+ dispArray[i] = 11; //Any number other that 0-9 blanks digit
+ }
+ wait(1);
+
+
+ while (1)
+ { // Loop Counting
+ for (unsigned int i=0; i<2000000000; i++)
+ { //Loop - arbitary value
+ showNum(i); //
+ wait_us(50);
+ }
+ }
+
+ } //End While
+} //End of main
+
+////////////////////////////////////////////////
+
+void showNum(unsigned int num)
+{ //Splits number into digits
+ if (num < 10)
+ { //If < 10 only 1 digit needed
+ updateDisp (num, 1); //Update array
+ }
+ else
+ { //Otherwise split and add to array
+ int count = 1;
+ while (num!=0)
+ { //Split each digit and add to array in position for display
+ int digit = num % 10;
+ num = num / 10;
+ updateDisp (digit, count);
+ count++;
+ }
+ }
+}
+
+////////////////////////////////////////////////
+
+void updateDisp (int num, int digit)
+{ //Update display array
+ //Seperate function - not needed now but maybe for further fuctionality
+ dispArray[digit] = num;
+}
+
+////////////////////////////////////////////////
+
+void upDisp (void)
+{ //Called by ticker - switched displayed digit - using POV to muliplex display
+ if (dispArrayIndex < 11)
+ { //Increment display index
+ dispArrayIndex++;
+ }
+ else
+ { //Otherwise out of rage - reset
+ dispArrayIndex = 0;
+ }
+ // Call function to switch digit and value
+ dispNumDig (dispArray[dispArrayIndex], dispArrayIndex);
+}
+
+////////////////////////////////////////////////
+
+void dispNumDig (int num, int digit)
+{ //Switches Digit and corrisponding Segments
+//Switch/Case setup - more efficient way of coding???
+ switch (digit)
+ {
+ case 1:
+ D1 = 0;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 2:
+ D1 = 1;
+ D2 = 0;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 3:
+ D1 = 1;
+ D2 = 1;
+ D3 = 0;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 4:
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 0;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 5:
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 0;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 6:
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 0;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 7:
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 0;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 8:
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 0;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 9:
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 0;
+ D10 = 1;
+ D11 = 1;
+ break;
+ case 10:
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 0;
+ D11 = 1;
+ break;
+ case 11:
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 0;
+ break;
+ default: //If out of range switch off all digits
+ D1 = 1;
+ D2 = 1;
+ D3 = 1;
+ D4 = 1;
+ D5 = 1;
+ D6 = 1;
+ D7 = 1;
+ D8 = 1;
+ D9 = 1;
+ D10 = 1;
+ D11 = 1;
+ break;
+ }
+
+
+
+ switch (num)
+ { //Case not currently included for decimcal point (SP)
+ case 0:
+ SP = 0;
+ SA = 1;
+ SB = 1;
+ SC = 1;
+ SD = 1;
+ SE = 1;
+ SF = 1;
+ SG = 0;
+ break;
+ case 1:
+ SP = 0;
+ SA = 0;
+ SB = 1;
+ SC = 1;
+ SD = 0;
+ SE = 0;
+ SF = 0;
+ SG = 0;
+ break;
+ case 2:
+ SP = 0;
+ SA = 1;
+ SB = 1;
+ SC = 0;
+ SD = 1;
+ SE = 1;
+ SF = 0;
+ SG = 1;
+ break;
+ case 3:
+ SP = 0;
+ SA = 1;
+ SB = 1;
+ SC = 1;
+ SD = 1;
+ SE = 0;
+ SF = 0;
+ SG = 1;
+ break;
+ case 4:
+ SP = 0;
+ SA = 0;
+ SB = 1;
+ SC = 1;
+ SD = 0;
+ SE = 0;
+ SF = 1;
+ SG = 1;
+ break;
+ case 5:
+ SP = 0;
+ SA = 1;
+ SB = 0;
+ SC = 1;
+ SD = 1;
+ SE = 0;
+ SF = 1;
+ SG = 1;
+ break;
+ case 6:
+ SP = 0;
+ SA = 1;
+ SB = 0;
+ SC = 1;
+ SD = 1;
+ SE = 1;
+ SF = 1;
+ SG = 1;
+ break;
+ case 7:
+ SP = 0;
+ SA = 1;
+ SB = 1;
+ SC = 1;
+ SD = 0;
+ SE = 0;
+ SF = 0;
+ SG = 0;
+ break;
+ case 8:
+ SP = 0;
+ SA = 1;
+ SB = 1;
+ SC = 1;
+ SD = 1;
+ SE = 1;
+ SF = 1;
+ SG = 1;
+ break;
+ case 9:
+ SP = 0;
+ SA = 1;
+ SB = 1;
+ SC = 1;
+ SD = 1;
+ SE = 0;
+ SF = 1;
+ SG = 1;
+ break;
+
+ default: // If out of range switch off all segments
+ SP = 0;
+ SA = 0;
+ SB = 0;
+ SC = 0;
+ SD = 0;
+ SE = 0;
+ SF = 0;
+ SG = 0;
+ }
+}
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