Skip to content

Instantly share code, notes, and snippets.

@abitCoding

abitCoding/pwm_example_1.c

Created September 7, 2020 07:26
Download ZIP

Revisions

  1. abitCoding created this gist Sep 7, 2020.
    47 changes: 47 additions & 0 deletions pwm_example_1.c
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,47 @@

    #include <18F4550.h>
    #device ADC=10
    #fuses HS,PLL1,CPUDIV1
    #use delay(clock=20000000)

    #use PWM(CCP1,FREQUENCY=10K,DUTY=0)

    #define LCD_ENABLE_PIN PIN_B2
    #define LCD_RS_PIN PIN_B0
    #define LCD_RW_PIN PIN_B1

    #define LCD_DATA4 PIN_B4
    #define LCD_DATA5 PIN_B5
    #define LCD_DATA6 PIN_B6
    #define LCD_DATA7 PIN_B7
    #include<lcd.c>

    void adcSetUp(void){
    set_tris_a(0x01);
    //Set RA0 To Analog
    setup_adc_ports(AN0);
    //Select ADC internal RC Clock
    setup_adc(ADC_CLOCK_INTERNAL);
    //Select channel 0 for conversion
    }

    void main(void){
    unsigned long temp;
    lcd_init();
    adcSetUp();
    lcd_gotoxy(1,1);
    printf(LCD_PUTC,"PWM EXAMPLE");
    while(1){
    /*Set PWM Duty Cycle*/
    set_adc_channel(0);
    delay_ms(1);
    temp=read_adc();
    while(!adc_done());
    /*Convert from 1024 to 1000*/
    temp=(temp*1000.0)/1024;
    pwm_set_duty_percent(temp);
    lcd_gotoXy(1,2);
    printf(LCD_PUTC,"Duty Cycle %0.2f ",(float)(temp/10.0));
    delay_ms(10);
    }
    }