Sally Brown / Mbed 2 deprecated RenBed_Tutorial3

Driving the 7 segment display

Dependencies:   SevenSegLed mbed

main.cpp@0:440732350fa8, 2014-02-07 (annotated)

Committer:
salatron
Date:
Fri Feb 07 10:39:28 2014 +0000
Revision:
0:440732350fa8
7 Segment Display

Who changed what in which revision?

UserRevisionLine numberNew contents of line
salatron 0:440732350fa8 1 /*******************************************************************************
salatron 0:440732350fa8 2 * This program demonstrates how to drive the seven segment display *
salatron 0:440732350fa8 3 * *
salatron 0:440732350fa8 4 * Jon Fuge *
salatron 0:440732350fa8 5 * V1.0 13/12/2013 First issue of code *
salatron 0:440732350fa8 6 *******************************************************************************/
salatron 0:440732350fa8 7 #include "mbed.h"
salatron 0:440732350fa8 8 #include "SevenSegLed.h"
salatron 0:440732350fa8 9
salatron 0:440732350fa8 10 // Lets define some "macros" to make the code easier to read
salatron 0:440732350fa8 11 #define mUnits D_7seg[1] // "mUnits" will be substiuted for "D_7seg[1]"
salatron 0:440732350fa8 12 #define mTens D_7seg[0] // "mTens" will be substiuted for "D_7seg[0]"
salatron 0:440732350fa8 13 #define mDot D_dot[1] // "mDot" will be substiuted for "D_dot[1]"
salatron 0:440732350fa8 14
salatron 0:440732350fa8 15 void attimeout(); //declare prototype for timeout handler.
salatron 0:440732350fa8 16 //configure sevensegled pin connection mapping.
salatron 0:440732350fa8 17 //
salatron 0:440732350fa8 18 // common type (0:anode common 1:cathode common)
salatron 0:440732350fa8 19 // | display mode (0:smooth 1:hard)
salatron 0:440732350fa8 20 // | | segA segB segC segD segE segF segG segP com1 com2
salatron 0:440732350fa8 21 SevenSegLed segmentled(0, 0, P1_23, P1_28, P0_16, P1_31, P1_13, P1_16, P1_19, P0_23, p21, P1_25);
salatron 0:440732350fa8 22
salatron 0:440732350fa8 23 //Define two arrays to house the data to be outputted. D_7seg can contain digits 0‐F and D_dot 0‐1.
salatron 0:440732350fa8 24 //
salatron 0:440732350fa8 25 // 0 1 //0 = leftmost digit, 1 = rightmost digit
salatron 0:440732350fa8 26 // | |
salatron 0:440732350fa8 27 uint8_t D_7seg[2] = {0, 0}; // number (0x00:"0", ... , 0x09:"9", 0x0A:"A", ... , 0x0F:"F", other:" ")
salatron 0:440732350fa8 28 uint8_t D_dot[2] = {0, 0}; // dotpoint. (0:off 1:on)
salatron 0:440732350fa8 29 Ticker timeout; //Create an instance of class Ticker called timeout.
salatron 0:440732350fa8 30
salatron 0:440732350fa8 31 int main()
salatron 0:440732350fa8 32 {
salatron 0:440732350fa8 33 timeout.attach_us(&attimeout, 500000); // Set up interrupt to call attimeout() every half a second.
salatron 0:440732350fa8 34 for(;;)
salatron 0:440732350fa8 35 {
salatron 0:440732350fa8 36 segmentled.SevenSegLed_main(D_7seg, D_dot); // Keep the displays multiplexed.
salatron 0:440732350fa8 37 }
salatron 0:440732350fa8 38 }
salatron 0:440732350fa8 39
salatron 0:440732350fa8 40 void attimeout() //Timer interrupt routine.
salatron 0:440732350fa8 41 {
salatron 0:440732350fa8 42 mDot = 1 - mDot;
salatron 0:440732350fa8 43 if (mDot == 1)
salatron 0:440732350fa8 44 {
salatron 0:440732350fa8 45 mUnits++; // This means the same as D_7seg[0] = D_7seg[0] + 1; Increment "units"
salatron 0:440732350fa8 46
salatron 0:440732350fa8 47 if (mUnits > 9)
salatron 0:440732350fa8 48 { // "units" digit should be in the range 0 ‐> 9
salatron 0:440732350fa8 49 mUnits = 0; // Reset the "units" to 0
salatron 0:440732350fa8 50 mTens++; // Increment "tens" digit
salatron 0:440732350fa8 51
salatron 0:440732350fa8 52 if (mTens > 9)
salatron 0:440732350fa8 53 { // "tens" digit should be in the range 0 ‐> 9
salatron 0:440732350fa8 54 mTens = 0; // Reset the "tens" to 0
salatron 0:440732350fa8 55 }
salatron 0:440732350fa8 56 }
salatron 0:440732350fa8 57 }
salatron 0:440732350fa8 58 }