| 0,0 → 1,33 |
|---|
| #include <xc.h> |
| #include "defines.h" |
| #include "base_PWM.h" |
| |
| void PWM_Init() { |
| // Output pin initially blocked |
| PWM_TRIS = 1; |
| |
| /* Initialize PWM module */ |
| PR2 = 0xF9; // 4ms @ 16MHz |
| CCP1CONbits.P1M = 0b00; // Single output, P1A modulated only |
| CCP1CONbits.CCP1M = 0b1100; // PWM mode, P1A active-high, P1B active-high |
| |
| // Idle the output till width is specified |
| CCPR1L = 0x00; |
| CCP1CONbits.DC1B = 0b00; |
| |
| /* Initialize Timer 2 */ |
| PIR1bits.TMR2IF = 0; // Clear the interrupt flag for Timer 2 |
| T2CONbits.T2CKPS = 0b11; // Set a prescaler of 64 |
| T2CONbits.TMR2ON = 1; // Enable the timer |
| |
| // Wait for the timer to overflow before enabling output |
| while (!PIR1bits.TMR2IF); |
| PWM_TRIS = 0; |
| } |
| |
| void PWM_Set_Width(int width_us) { |
| // Set the pulse duration to the requested width |
| int value = width_us / 4; |
| CCPR1L = value >> 2; |
| CCP1CONbits.DC1B = value; |
| } |