Pulse Width Modulation

Functions
int	rflpc_pwm_init (rflpc_pin_t pin)
	Inits the PWM peripheral for use with selected pin. More...
void	rflpc_pwm_start (void)
	Starts pwm duty cycle. More...
void	rflpc_pwm_stop (void)
	Stops pwm duty cycle. More...
void	rflpc_pwm_reset (void)
	Resets pwm duty cycle (restart at the start of a period. More...
void	rflpc_pwm_set_period (uint32_t period)
	Sets the period in micro seconds. More...
void	rflpc_pwm_single_edge (rflpc_pin_t pin, uint32_t pulsewidth)
	Sets the pwm parameters in single edge mode. More...
void	rflpc_pwm_double_edge (rflpc_pin_t pin, uint32_t high_edge, uint32_t low_edge)
	Sets the pwm parameters to operate on double edge mode. More...
void	rflpc_pwm_enable (rflpc_pin_t pin)
	Enable the PWM on the given pin (do not reset the timer, only enable PWM output) More...
void	rflpc_pwm_disable (rflpc_pin_t pin)
	Disable the PWM output on the given pin. More...

Detailed Description

Function Documentation

void rflpc_pwm_disable

(

rflpc_pin_t

pin

)

Disable the PWM output on the given pin.

Warning

This will let the pin at the state it has.

Parameters

pin

void rflpc_pwm_double_edge	(	rflpc_pin_t	pin,
		uint32_t	high_edge,
		uint32_t	low_edge
	)

Sets the pwm parameters to operate on double edge mode.

Parameters

pin	the PWM pin (same restrictions as in rflpc_pwm_init)
high_edge	time at which the PWM ouput goes in high state (in microseconds)
low_edge	time at which the PWM ouput goes in low state (in microseconds)

Warning

In double edge mode, the match register used to select low and high state can are shared with previous and next PWM channel. See user manual page 512 to see how match registers are shared between PWM channels.

PWM1 can not be used as double edged

void rflpc_pwm_enable

(

rflpc_pin_t

pin

)

Enable the PWM on the given pin (do not reset the timer, only enable PWM output)

Parameters

pin

int rflpc_pwm_init

(

rflpc_pin_t

pin

)

Inits the PWM peripheral for use with selected pin.

Note

not all pins are available! And one PWM channel can only be used on one pin at a time. Available pins are:

• P1_18 and P2_0 for PWM1
• P1_20, P2_1 and P3_25 for PWM2
• P1_21, P2_2 and P3_26 for PWM3
• P1_23 and P2_3 for PWM4
• P1_24 and P2_4 for PWM5
• P1_26 and P2_5 for PWM6

Returns

returns -1 on error and 0 if no problem occurs

void rflpc_pwm_reset

(

void

)

Resets pwm duty cycle (restart at the start of a period.

void rflpc_pwm_set_period

(

uint32_t

period

)

Sets the period in micro seconds.

If the PWM timer was running, it is stop, reset and restarted to start on the new period.

Parameters

period

void rflpc_pwm_single_edge	(	rflpc_pin_t	pin,
		uint32_t	pulsewidth
	)

Sets the pwm parameters in single edge mode.

This call makes the PWM outputs a pulse of a given width at the start of each period

Parameters

pin	the PWM pin (same restriction as rflpc_pwm_init apply)
pulsewidth	The width of the pulse in micro seconds

void rflpc_pwm_start

(

void

)

Starts pwm duty cycle.

void rflpc_pwm_stop

(

void

)

Stops pwm duty cycle.