Hello Everyone
I'm trying to control the brightness of an LED connected to pin RB1 using PWM PIC18F45K80. I have already read through the datasheet, but I'm facing some difficulties in configuring the PWM module correctly. I followed this link https://circuitdigest.com/microcontroller-projects/pic-microcontroller-pic16f877a-pwm-tutorial for guidance, but I'm still encountering issues.
I am looking for help in configuring the PWM module and writing code to gradually change the LED's brightness. Specifically, I need guidance on setting up the PWM period, duty cycle, and initializing the necessary registers.
Here's what I've done so far:
If anyone could provide step-by-step instructions, it would be greatly appreciated.
Thank you in advance for your help!
I'm trying to control the brightness of an LED connected to pin RB1 using PWM PIC18F45K80. I have already read through the datasheet, but I'm facing some difficulties in configuring the PWM module correctly. I followed this link https://circuitdigest.com/microcontroller-projects/pic-microcontroller-pic16f877a-pwm-tutorial for guidance, but I'm still encountering issues.
I am looking for help in configuring the PWM module and writing code to gradually change the LED's brightness. Specifically, I need guidance on setting up the PWM period, duty cycle, and initializing the necessary registers.
Here's what I've done so far:
C:
#define _XTAL_FREQ 8000000
// PIC18F45K80 Configuration Bit Settings
// 'C' source line config statements
// CONFIG1L
#pragma config RETEN = OFF // VREG Sleep Enable bit (Ultra low-power regulator is Disabled (Controlled by REGSLP bit))
#pragma config INTOSCSEL = HIGH // LF-INTOSC Low-power Enable bit (LF-INTOSC in High-power mode during Sleep)
#pragma config SOSCSEL = HIGH // SOSC Power Selection and mode Configuration bits (High Power SOSC circuit selected)
#pragma config XINST = OFF // Extended Instruction Set (Enabled)
// CONFIG1H
#pragma config FOSC = INTIO2 // Oscillator (Internal RC oscillator)
#pragma config PLLCFG = OFF // PLL x4 Enable bit (Disabled)
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor (Disabled)
#pragma config IESO = OFF // Internal External Oscillator Switch Over Mode (Disabled)
// CONFIG2L
#pragma config PWRTEN = OFF // Power Up Timer (Disabled)
#pragma config BOREN = SBORDIS // Brown Out Detect (Enabled in hardware, SBOREN disabled)
#pragma config BORV = 3 // Brown-out Reset Voltage bits (1.8V)
#pragma config BORPWR = ZPBORMV // BORMV Power level (ZPBORMV instead of BORMV is selected)
// CONFIG2H
#pragma config WDTEN = OFF // Watchdog Timer (WDT disabled in hardware; SWDTEN bit disabled)
#pragma config WDTPS = 1048576 // Watchdog Postscaler (1:1048576)
// CONFIG3H
#pragma config CANMX = PORTB // ECAN Mux bit (ECAN TX and RX pins are located on RB2 and RB3, respectively)
#pragma config MSSPMSK = MSK7 // MSSP address masking (7 Bit address masking mode)
#pragma config MCLRE = ON // Master Clear Enable (MCLR Enabled, RE3 Disabled)
// CONFIG4L
#pragma config STVREN = ON // Stack Overflow Reset (Enabled)
#pragma config BBSIZ = BB2K // Boot Block Size (2K word Boot Block size)
// CONFIG5L
#pragma config CP0 = OFF // Code Protect 00800-01FFF (Disabled)
#pragma config CP1 = OFF // Code Protect 02000-03FFF (Disabled)
#pragma config CP2 = OFF // Code Protect 04000-05FFF (Disabled)
#pragma config CP3 = OFF // Code Protect 06000-07FFF (Disabled)
// CONFIG5H
#pragma config CPB = OFF // Code Protect Boot (Disabled)
#pragma config CPD = OFF // Data EE Read Protect (Disabled)
// CONFIG6L
#pragma config WRT0 = OFF // Table Write Protect 00800-01FFF (Disabled)
#pragma config WRT1 = OFF // Table Write Protect 02000-03FFF (Disabled)
#pragma config WRT2 = OFF // Table Write Protect 04000-05FFF (Disabled)
#pragma config WRT3 = OFF // Table Write Protect 06000-07FFF (Disabled)
// CONFIG6H
#pragma config WRTC = OFF // Config. Write Protect (Disabled)
#pragma config WRTB = OFF // Table Write Protect Boot (Disabled)
#pragma config WRTD = OFF // Data EE Write Protect (Disabled)
// CONFIG7L
#pragma config EBTR0 = OFF // Table Read Protect 00800-01FFF (Disabled)
#pragma config EBTR1 = OFF // Table Read Protect 02000-03FFF (Disabled)
#pragma config EBTR2 = OFF // Table Read Protect 04000-05FFF (Disabled)
#pragma config EBTR3 = OFF // Table Read Protect 06000-07FFF (Disabled)
// CONFIG7H
#pragma config EBTRB = OFF // Table Read Protect Boot (Disabled)
#include <xc.h>
// Function to initialize PWM
void PWM_Initialize() {
// Set CCP4 pin (RB0) as an output
TRISB0 = 0;
CCP4CONbits.CCP4M = 0b1100; // Set CCP4 for PWM mode
// Set the PWM frequency for approximately 1 kHz with a prescaler of 16
PR2 = 124; // For an 8 MHz oscillator, prescaler 16, and 1 kHz PWM frequency
// Set the initial duty cycle (50%)
CCPR4L =
DC4B1 = 0;
DC4B0 = 0;
// Enable Timer2 and its prescaler (1:4)
TMR2ON = 1;
T2CKPS1 = 1;
T2CKPS0 = 0;
}
void main(void) {
// Initialize the PWM module
PWM_Initialize();
TRISB = 0b00000010; // LED connected to RB1
while (1) {
}
}If anyone could provide step-by-step instructions, it would be greatly appreciated.
Thank you in advance for your help!
