Difference between revisions of "C Example: Digital Inputs"
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Program to display |
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// Program to display push-button input as LED output |
// Program to display push-button input as LED output |
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Revision as of 15:16, 25 June 2007
Program to display
// Program to display push-button input as LED output
// First include header file with definitions for specific PIC. // Set fuses. HS is type of external clock, low voltage protection // (LVP) is off, and the watchdog timer (WDT) is off. // External clock frequency of 20 MHz is specified.
#include <18f4520.h> #fuses HS,NOLVP,NOWDT #use delay (clock=20000000)
// Define pin names to be used in the main program. See header file // for currently defined pin names.
#define IN0 PIN_B0 #define IN1 PIN_B1 #define IN2 PIN_B2 #define OUT0 PIN_D0 #define OUT1 PIN_D1 #define OUT2 PIN_D2
// Begin main body of program.
void main(void) {
// Use while to set up infinite loop.
while(TRUE){
// Check each input pin and define action to be taken depending on // reading from input (in this case, set the output to the input).
if(input(IN0)) output_high(OUT0); else if (!input(IN0)) output_low(OUT0);
if(input(IN1)) output_high(OUT1); else if (!input(IN1)) output_low(OUT1);
if(input(IN2)) output_high(OUT2); else if (!input(IN2)) output_low(OUT2);} }