PIC18 Software PWM Driver

The driver provides PWM output functionality for PIC18F26K83 on one pin, with timer only. Pulse-width/duty-cycle can be adjusted when output is enabled. Timer 2 is used by this driver.

Integration

ROCKETLIB_PWM_PIN Macro

Set ROCKETLIB_PWM_PIN macro to the pin register name for output, e.g. LATC6

ROCKETLIB_PWM_INVERT_POLARITY Macro

Set ROCKETLIB_PWM_INVERT_POLARITY macro to inverse output polarity

Interrupt

void timer2_handle_interrupt(void) have to be called when having a timer 2 interrupt

SoftPWM Controller Functions

Initialization

void pwm_init(uint16_t period)

Initialize Software PWM

Parameters

• period (uint16_t) – period in increment of 10 us

Enable

void pwm_enable(void)

Enable PWM Output

Disable

void pwm_disable(void)

Disable PWM Output

Set Duty Cycle

bool pwm_set_duty_cycle(uint16_t duty_cycle)

Set duty cycle

Parameters

• duty_cycle (uint16_t) – Duty cycle in per-mille(1/1000)

Returns

success or not

Return values

• true – success

• false – failed

Set Pulse Width

bool pwm_set_pulse_width(uint16_t pulse_width)

Set pulse width

Parameters

• pulse_width (uint16_t) – pulse width in increment of 10 us

Returns

success or not

Return values

• true – success

• false – failed