atmel_pwm.h File Reference

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Data Structures
struct	pwm_channel

Macros
#define	pwm_channel_enable(ch)   __pwm_channel_onoff((ch), 1)
#define	pwm_channel_disable(ch)   __pwm_channel_onoff((ch), 0)
#define	PWM_CMR   0x00 /* mode register */
#define	PWM_CPR_CPD   (1 << 10) /* set: CUPD modifies period */
#define	PWM_CPR_CPOL   (1 << 9) /* set: idle high */
#define	PWM_CPR_CALG   (1 << 8) /* set: center align */
#define	PWM_CPR_CPRE   (0xf << 0) /* mask: rate is mck/(2^pre) */
#define	PWM_CPR_CLKA   (0xb << 0) /* rate CLKA */
#define	PWM_CPR_CLKB   (0xc << 0) /* rate CLKB */
#define	PWM_CDTY   0x04 /* duty cycle (max of CPRD) */
#define	PWM_CPRD   0x08 /* period (count up from zero) */
#define	PWM_CCNT   0x0c /* counter (20 bits?) */
#define	PWM_CUPD   0x10 /* update CPRD (or CDTY) next period */

Functions
int	pwm_channel_alloc (int index, struct pwm_channel *ch)
int	pwm_channel_free (struct pwm_channel *ch)
int	pwm_clk_alloc (unsigned prescale, unsigned div)
void	pwm_clk_free (unsigned clk)
int	__pwm_channel_onoff (struct pwm_channel *ch, int enabled)
int	pwm_channel_handler (struct pwm_channel *ch, void(*handler)(struct pwm_channel *ch))

Macro Definition Documentation

#define PWM_CCNT   0x0c /* counter (20 bits?) */

Definition at line 56 of file atmel_pwm.h.

#define PWM_CDTY   0x04 /* duty cycle (max of CPRD) */

Definition at line 54 of file atmel_pwm.h.

#define pwm_channel_disable

(

ch

)

__pwm_channel_onoff((ch), 0)

Definition at line 40 of file atmel_pwm.h.

#define pwm_channel_enable

(

ch

)

__pwm_channel_onoff((ch), 1)

Definition at line 39 of file atmel_pwm.h.

#define PWM_CMR   0x00 /* mode register */

Definition at line 47 of file atmel_pwm.h.

#define PWM_CPR_CALG   (1 << 8) /* set: center align */

Definition at line 50 of file atmel_pwm.h.

#define PWM_CPR_CLKA   (0xb << 0) /* rate CLKA */

Definition at line 52 of file atmel_pwm.h.

#define PWM_CPR_CLKB   (0xc << 0) /* rate CLKB */

Definition at line 53 of file atmel_pwm.h.

#define PWM_CPR_CPD   (1 << 10) /* set: CUPD modifies period */

Definition at line 48 of file atmel_pwm.h.

#define PWM_CPR_CPOL   (1 << 9) /* set: idle high */

Definition at line 49 of file atmel_pwm.h.

#define PWM_CPR_CPRE   (0xf << 0) /* mask: rate is mck/(2^pre) */

Definition at line 51 of file atmel_pwm.h.

#define PWM_CPRD   0x08 /* period (count up from zero) */

Definition at line 55 of file atmel_pwm.h.

#define PWM_CUPD   0x10 /* update CPRD (or CDTY) next period */

Definition at line 57 of file atmel_pwm.h.

Function Documentation

int __pwm_channel_onoff	(	struct pwm_channel *	ch,
		int	enabled
	)

Definition at line 170 of file atmel_pwm.c.

int pwm_channel_alloc	(	int	index,
		struct pwm_channel *	ch
	)

pwm_channel_alloc - allocate an unused PWM channel : identifies the channel : structure to be initialized

Drivers allocate PWM channels according to the board's wiring, and matching board-specific setup code. Returns zero or negative errno.

Definition at line 88 of file atmel_pwm.c.

int pwm_channel_free

(

struct pwm_channel *

ch

)

pwm_channel_free - release a previously allocated channel : the channel being released

The channel is completely shut down (counter and IRQ disabled), and made available for re-use. Returns zero, or negative errno.

Definition at line 147 of file atmel_pwm.c.

int pwm_channel_handler	(	struct pwm_channel *	ch,
		void(*)(struct pwm_channel *ch)	handler
	)

pwm_channel_handler - manage channel's IRQ handler : the channel : the handler to use, possibly NULL

If the handler is non-null, the handler will be called after every period of this PWM channel. If the handler is null, this channel won't generate an IRQ.

Definition at line 255 of file atmel_pwm.c.

int pwm_clk_alloc	(	unsigned	prescale,
		unsigned	div
	)

pwm_clk_alloc - allocate and configure CLKA or CLKB : from 0..10, the power of two used to divide MCK : from 1..255, the linear divisor to use

Returns PWM_CPR_CLKA, PWM_CPR_CLKB, or negative errno. The allocated clock will run with a period of (2^prescale * div) / MCK, or twice as long if center aligned PWM output is used. The clock must later be deconfigured using pwm_clk_free().

Definition at line 200 of file atmel_pwm.c.

void pwm_clk_free

(

unsigned

clk

)

pwm_clk_free - deconfigure and release CLKA or CLKB

Reverses the effect of pwm_clk_alloc().

Definition at line 231 of file atmel_pwm.c.