Module for generating a pulse-width modulated output signal. More...

Data Structures
struct	app_pwm_config_t
	PWM configuration structure used for initialization. More...

struct	app_pwm_t
	PWM instance structure. More...

Macros
#define	APP_PWM_NOPIN 0xFFFFFFFF

#define	APP_PWM_CHANNELS_PER_INSTANCE 2
	Number of channels for one timer instance (fixed to 2 due to timer properties).

#define	APP_PWM_CB_SIZE 9
	Size of the PWM instance control block (fixed value).

#define	APP_PWM_INSTANCE(name, num)
	Macro for creating a PWM instance. More...

#define	APP_PWM_DEFAULT_CONFIG_1CH(period_in_us, pin)
	PWM instance default configuration (1 channel). More...

#define	APP_PWM_DEFAULT_CONFIG_2CH(period_in_us, pin0, pin1)
	PWM instance default configuration (2 channels). More...

Typedefs
typedef uint16_t	app_pwm_duty_t

typedef void(*	app_pwm_callback_t )(uint32_t)
	PWM callback that is executed when a PWM duty change has been completed. More...

Enumerations
enum	app_pwm_polarity_t { APP_PWM_POLARITY_ACTIVE_LOW = 0, APP_PWM_POLARITY_ACTIVE_HIGH = 1 }
	Channel polarity.

Functions
ret_code_t	app_pwm_init (app_pwm_t const const p_instance, app_pwm_config_t const const p_config, app_pwm_callback_t p_ready_callback)
	Function for initializing a PWM instance. More...

uint32_t	app_pwm_uninit (app_pwm_t const *const p_instance)
	Function for uninitializing a PWM instance and releasing the allocated resources. More...

void	app_pwm_enable (app_pwm_t const *const p_instance)
	Function for enabling a PWM instance after initialization. More...

void	app_pwm_disable (app_pwm_t const *const p_instance)
	Function for stopping a PWM instance after initialization. More...

uint32_t	app_pwm_channel_duty_set (app_pwm_t const *const p_instance, uint8_t channel, app_pwm_duty_t duty)
	Function for setting the PWM channel duty cycle in percents. More...

app_pwm_duty_t	app_pwm_channel_duty_get (app_pwm_t const *const p_instance, uint8_t channel)
	Function for retrieving the PWM channel duty cycle in percents. More...

Detailed Description

Module for generating a pulse-width modulated output signal.

This module provides a PWM implementation using timers, GPIOTE, and PPI.

Each PWM instance utilizes 1 timer, 2 PPI channels, and 1 PPI channel group plus 2 PPI and 1 GPIOTE channels per PWM channel. The maximum number of PWM channels per instance is 2.

Macro Definition Documentation

#define APP_PWM_DEFAULT_CONFIG_1CH	(	period_in_us,
		pin
	)

Value:

{ \
 .pins = {pin, APP_PWM_NOPIN}, \
 .pin_polarity = {APP_PWM_POLARITY_ACTIVE_LOW, APP_PWM_POLARITY_ACTIVE_LOW}, \
 .num_of_channels = 1, \
 .period_us = period_in_us \
 }

PWM instance default configuration (1 channel).

#define APP_PWM_DEFAULT_CONFIG_2CH	(	period_in_us,
		pin0,
		pin1
	)

Value:

{ \
 .pins = {pin0, pin1}, \
 .pin_polarity = {APP_PWM_POLARITY_ACTIVE_LOW, APP_PWM_POLARITY_ACTIVE_LOW}, \
 .num_of_channels = 2, \
 .period_us = period_in_us \
 }

PWM instance default configuration (2 channels).

#define APP_PWM_INSTANCE	(	name,
		num
	)

Value:

const nrf_drv_timer_t m_pwm_##name##_timer = NRF_DRV_TIMER_INSTANCE(num); \
 uint32_t m_pwm_##name##_cb[APP_PWM_CB_SIZE]; \
 /*lint -e{545}*/ \
 const app_pwm_t name = { \
 .p_cb = &m_pwm_##name##_cb, \
 .p_timer = &m_pwm_##name##_timer, \
 }

Macro for creating a PWM instance.

Typedef Documentation

typedef void(* app_pwm_callback_t)(uint32_t)

PWM callback that is executed when a PWM duty change has been completed.

Parameters

[in] pwm_id PWM instance ID.

Function Documentation

app_pwm_duty_t app_pwm_channel_duty_get	(	app_pwm_t const *const	p_instance,
		uint8_t	channel
	)

Function for retrieving the PWM channel duty cycle in percents.

Parameters

[in]	p_instance	PWM instance.
[in]	channel	Channel number.

Returns: Duty cycle value.

uint32_t app_pwm_channel_duty_set	(	app_pwm_t const *const	p_instance,
		uint8_t	channel,
		app_pwm_duty_t	duty
	)

Function for setting the PWM channel duty cycle in percents.

A duty cycle change requires one full PWM clock period to finish. If another change is attempted for any channel of given instance before the current change is complete, the new attempt will result in the error NRF_ERROR_BUSY.

Parameters

[in]	p_instance	PWM instance.
[in]	channel	Channel number.
[in]	duty	Duty cycle (0 - 100).

Return values

NRF_SUCCESS	If the operation was successful.
NRF_ERROR_BUSY	If the PWM is not ready yet.
NRF_ERROR_INVALID_STATE	If the given instance was not initialized.

void app_pwm_disable ( app_pwm_t const *const p_instance )

Function for stopping a PWM instance after initialization.

Parameters

[in] p_instance PWM instance.

Return values

NRF_SUCCESS	If the operation was successful.
NRF_ERROR_INVALID_STATE	If the given instance was not initialized.

void app_pwm_enable ( app_pwm_t const *const p_instance )

Function for enabling a PWM instance after initialization.

Parameters

[in] p_instance PWM instance.

Return values

NRF_SUCCESS	If the operation was successful.
NRF_ERROR_INVALID_STATE	If the given instance was not initialized.

ret_code_t app_pwm_init	(	app_pwm_t const *const	p_instance,
		app_pwm_config_t const *const	p_config,
		app_pwm_callback_t	p_ready_callback
	)

Function for initializing a PWM instance.

Parameters

[in]	p_instance	PWM instance.
[in]	p_config	Initial configuration.
[in]	p_ready_callback	Pointer to ready callback function (or NULL to disable).

Return values

NRF_SUCCESS	If initialization was successful.
NRF_ERROR_NO_MEM	If there were not enough free resources.
NRF_ERROR_INVALID_PARAM	If an invalid configuration structure was passed.
NRF_ERROR_INVALID_STATE	If the timer/PWM is already in use or if initialization failed.

uint32_t app_pwm_uninit ( app_pwm_t const *const p_instance )

Function for uninitializing a PWM instance and releasing the allocated resources.

Parameters

[in] p_instance PWM instance.

Return values

NRF_SUCCESS	If uninitialization was successful.
NRF_ERROR_INVALID_STATE	If the given instance was not initialized.

Data Structures

Macros

Typedefs

Enumerations

Functions

Detailed Description

Macro Definition Documentation

Typedef Documentation

Function Documentation