7 Segment display counter
Dependencies: SevenSegLed mbed
main.cpp
- Committer:
- jf1452
- Date:
- 2013-11-14
- Revision:
- 0:134a896bf705
File content as of revision 0:134a896bf705:
#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. #include "SevenSegLed.h" //Include the SevenSegLed header file which contains the class for the SevenSegLed output library. // Lets define some "macros" to make the code easier to read #define mUnits D_7seg[1] // When the compiler finds "units" it will substiute it for "D_7seg[1]" #define mTens D_7seg[0] // When the compiler finds "units" it will substiute it for "D_7seg[1]" #define mDot D_dot[1] // When the compiler finds "units" it will substiute it for "D_7seg[1]" void attimeout(); //prototype declared above main function to avoid errors. //Below is the creation of an instance of SevenSegLed called segmentled. //It is constructed with the information relating to the pins which are used, the type of display (common anode or cathode) and //the type of transition between outputs. Display mode = smooth will fade the new number in while hard will just change it immediately. //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 //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. // // common type (0:anode common 1:cathode common) // | // | display mode (0:smooth 1:hard) // | | // | | segA segB segC segD segE segF segG segP com1 com2 // | | | | | | | | | | | | SevenSegLed segmentled(0, 0, P1_23, P1_28, P0_16, P1_31, P1_13, P1_16, P1_19, P0_23, p21, P1_25); //Define two arrays to house the data to be outputted. D_7seg can contain digits 0-F and D_dot 0-1. // // 0 1 //0 = leftmost digit, 1 = rightmost digit // | | uint8_t D_7seg[2] = {0, 0}; // seven segment digit number (0x00:"0", 0x01:"1", ... , 0x09:"9", 0x0A:"A", ... , 0x0F:"F", other:" ") uint8_t D_dot[2] = {0, 0}; // seven segment digit dotpoint. (0:off 1:on) Ticker timeout; //Create an instance of class Ticker called timeout. int main() { timeout.attach_us(&attimeout, 500000); //Call attach function in timeout instance to call attimeout() every 500,000us (half a second). for(;;) { segmentled.SevenSegLed_main(D_7seg, D_dot); //Repeatedly call the Segment output function to keep the displays multiplexed. } } void attimeout() //Timer interrupt routine. { mDot = 1 - mDot; if (mDot == 1) { mUnits++; // This means the same as D_7seg[0] = D_7seg[0] + 1; Increment "units" digit if (mUnits > 9) { // "units" digit should be in the range 0 -> 9 mUnits = 0; // Reset the "units" to 0 mTens++; // Increment "tens" digit if (mTens > 9) { // "tens" digit should be in the range 0 -> 9 mTens = 0; // Reset the "tens" to 0 } } } }