Jon Fuge / Counter

7 Segment display counter

Dependencies:   SevenSegLed mbed

main.cpp@0:134a896bf705, 2013-11-14 (annotated)

Committer:
jf1452
Date:
Thu Nov 14 14:21:22 2013 +0000
Revision:
0:134a896bf705
First code issue

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jf1452 0:134a896bf705 1 #include "mbed.h" //Include the mbed header file which contains the prototypes of the libraries used here (DigitalOut, Ticker) as well as various syntax definitions.
jf1452 0:134a896bf705 2 #include "SevenSegLed.h" //Include the SevenSegLed header file which contains the class for the SevenSegLed output library.
jf1452 0:134a896bf705 3
jf1452 0:134a896bf705 4 // Lets define some "macros" to make the code easier to read
jf1452 0:134a896bf705 5
jf1452 0:134a896bf705 6 #define mUnits D_7seg[1] // When the compiler finds "units" it will substiute it for "D_7seg[1]"
jf1452 0:134a896bf705 7 #define mTens D_7seg[0] // When the compiler finds "units" it will substiute it for "D_7seg[1]"
jf1452 0:134a896bf705 8 #define mDot D_dot[1] // When the compiler finds "units" it will substiute it for "D_7seg[1]"
jf1452 0:134a896bf705 9
jf1452 0:134a896bf705 10 void attimeout(); //prototype declared above main function to avoid errors.
jf1452 0:134a896bf705 11
jf1452 0:134a896bf705 12 //Below is the creation of an instance of SevenSegLed called segmentled.
jf1452 0:134a896bf705 13 //It is constructed with the information relating to the pins which are used, the type of display (common anode or cathode) and
jf1452 0:134a896bf705 14 //the type of transition between outputs. Display mode = smooth will fade the new number in while hard will just change it immediately.
jf1452 0:134a896bf705 15 //com1 and com2 are the pins which power each display. As we only use one pin, com1 is filled with any unused pin and com2 is filled with
jf1452 0:134a896bf705 16 //the pin that is used for MUX. As com2 will go low when not in use the other display will be selected and the MUX effect will still work.
jf1452 0:134a896bf705 17 //
jf1452 0:134a896bf705 18 // common type (0:anode common 1:cathode common)
jf1452 0:134a896bf705 19 // |
jf1452 0:134a896bf705 20 // | display mode (0:smooth 1:hard)
jf1452 0:134a896bf705 21 // | |
jf1452 0:134a896bf705 22 // | | segA segB segC segD segE segF segG segP com1 com2
jf1452 0:134a896bf705 23 // | | | | | | | | | | | |
jf1452 0:134a896bf705 24 SevenSegLed segmentled(0, 0, P1_23, P1_28, P0_16, P1_31, P1_13, P1_16, P1_19, P0_23, p21, P1_25);
jf1452 0:134a896bf705 25
jf1452 0:134a896bf705 26 //Define two arrays to house the data to be outputted. D_7seg can contain digits 0-F and D_dot 0-1.
jf1452 0:134a896bf705 27 //
jf1452 0:134a896bf705 28 // 0 1 //0 = leftmost digit, 1 = rightmost digit
jf1452 0:134a896bf705 29 // | |
jf1452 0:134a896bf705 30 uint8_t D_7seg[2] = {0, 0}; // seven segment digit number (0x00:"0", 0x01:"1", ... , 0x09:"9", 0x0A:"A", ... , 0x0F:"F", other:" ")
jf1452 0:134a896bf705 31 uint8_t D_dot[2] = {0, 0}; // seven segment digit dotpoint. (0:off 1:on)
jf1452 0:134a896bf705 32
jf1452 0:134a896bf705 33 Ticker timeout; //Create an instance of class Ticker called timeout.
jf1452 0:134a896bf705 34
jf1452 0:134a896bf705 35 int main()
jf1452 0:134a896bf705 36 {
jf1452 0:134a896bf705 37
jf1452 0:134a896bf705 38 timeout.attach_us(&attimeout, 500000); //Call attach function in timeout instance to call attimeout() every 500,000us (half a second).
jf1452 0:134a896bf705 39
jf1452 0:134a896bf705 40 for(;;) {
jf1452 0:134a896bf705 41 segmentled.SevenSegLed_main(D_7seg, D_dot); //Repeatedly call the Segment output function to keep the displays multiplexed.
jf1452 0:134a896bf705 42 }
jf1452 0:134a896bf705 43 }
jf1452 0:134a896bf705 44
jf1452 0:134a896bf705 45 void attimeout() //Timer interrupt routine.
jf1452 0:134a896bf705 46 {
jf1452 0:134a896bf705 47 mDot = 1 - mDot;
jf1452 0:134a896bf705 48 if (mDot == 1) {
jf1452 0:134a896bf705 49 mUnits++; // This means the same as D_7seg[0] = D_7seg[0] + 1; Increment "units" digit
jf1452 0:134a896bf705 50 if (mUnits > 9) { // "units" digit should be in the range 0 -> 9
jf1452 0:134a896bf705 51 mUnits = 0; // Reset the "units" to 0
jf1452 0:134a896bf705 52 mTens++; // Increment "tens" digit
jf1452 0:134a896bf705 53 if (mTens > 9) { // "tens" digit should be in the range 0 -> 9
jf1452 0:134a896bf705 54 mTens = 0; // Reset the "tens" to 0
jf1452 0:134a896bf705 55 }
jf1452 0:134a896bf705 56 }
jf1452 0:134a896bf705 57 }
jf1452 0:134a896bf705 58 }