PWM

pwm functions More...

Ameba Common
typedef struct pwmout_s	pwmout_t
void	pwmout_init (pwmout_t *obj, PinName pin)
	Initializes the PWM function/registers of the specified pin with default parameters. More...
void	pwmout_free (pwmout_t *obj)
	Deinitializes the PWM device of the specified channel. More...
void	pwmout_write (pwmout_t *obj, float percent)
	Set the duty cycle of the specified channel. More...
float	pwmout_read (pwmout_t *obj)
	Get the duty cycle value of the specified channel. More...
void	pwmout_period (pwmout_t *obj, float seconds)
	Set the period of the specified channel in seconds. More...
void	pwmout_period_ms (pwmout_t *obj, int ms)
	Set the period of the specified channel in millseconds. More...
void	pwmout_period_us (pwmout_t *obj, int us)
	Set the period of the specified channel in microseconds. More...
void	pwmout_pulsewidth (pwmout_t *obj, float seconds)
	Set the pulse width of the specified channel in seconds. More...
void	pwmout_pulsewidth_ms (pwmout_t *obj, int ms)
	Set the pulse width of the specified channel in milliseconds. More...
void	pwmout_pulsewidth_us (pwmout_t *obj, int us)
	Set the pulse width of the specified channel in microseconds. More...

Detailed Description

pwm functions

Function Documentation

void pwmout_free

(

pwmout_t *

obj

)

Deinitializes the PWM device of the specified channel.

Parameters

obj	PWM object define in application software.

Return values

none

Note

If all channels are released, TIM5 will also be disabled.

void pwmout_init	(	pwmout_t *	obj,
		PinName	pin
	)

Initializes the PWM function/registers of the specified pin with default parameters.

Parameters

obj	PWM object define in application software.
pin	the pinname of specified channel to be set.

Return values

none

Note

• default period: 1638us
• default pulse width: 102us
• default duty cycle: 6.227%

void pwmout_period	(	pwmout_t *	obj,
		float	seconds
	)

Set the period of the specified channel in seconds.

Parameters

obj	PWM object define in application software.
seconds	The period value to be set in seconds.

Return values

none

void pwmout_period_ms	(	pwmout_t *	obj,
		int	ms
	)

Set the period of the specified channel in millseconds.

Parameters

obj	PWM object define in application software.
ms	The period value to be set in millseconds.

Return values

none

void pwmout_period_us	(	pwmout_t *	obj,
		int	us
	)

Set the period of the specified channel in microseconds.

Parameters

obj	PWM object define in application software.
us	The period value to be set in microseconds.

Return values

none

void pwmout_pulsewidth	(	pwmout_t *	obj,
		float	seconds
	)

Set the pulse width of the specified channel in seconds.

Parameters

obj	PWM object define in application software.
seconds	The pulse width value to be set in seconds.

Return values

none

void pwmout_pulsewidth_ms	(	pwmout_t *	obj,
		int	ms
	)

Set the pulse width of the specified channel in milliseconds.

Parameters

obj	PWM object define in application software.
ms	The pulse width value to be set in milliseconds.

Return values

none

void pwmout_pulsewidth_us	(	pwmout_t *	obj,
		int	us
	)

Set the pulse width of the specified channel in microseconds.

Parameters

obj	PWM object define in application software.
us	The pulse width value to be set in microseconds.

Return values

none

float pwmout_read

(

pwmout_t *

obj

)

Get the duty cycle value of the specified channel.

Parameters

obj	PWM object define in application software.

Return values

the duty cycle value of the specified channel.

void pwmout_write	(	pwmout_t *	obj,
		float	percent
	)

Set the duty cycle of the specified channel.

Parameters

obj	PWM object define in application software.
percent	The duty cycle value to be set.

Return values

none