PWM Support. More...

#include "bsp/raspberrypi-pwm.h"

Macros
#define	BCM2711_CM_PWM(x) BCM2835_REG( BCM2711_CM_PWM_BASE + ( x ) )

#define	CM_PWM_CTL_ENABLE_OSC ( CM_PWM_PASSWD \| CM_PWM_CTL_ENAB \| CM_PWM_CTL_SRC_OSC )

#define	CM_PWM_CTL_DISABLE ( CM_PWM_PASSWD \| CM_PWM_CTL_SRC_OSC )

Functions
rtems_status_code	rpi_pwm_set_clock (uint32_t divisor)
	Set PWM clock divider.

rtems_status_code	rpi_pwm_set_data (raspberrypi_pwm_master master, raspberrypi_pwm_channel channel, uint32_t data)
	Update duty-cycle register.

rtems_status_code	rpi_pwm_init (raspberrypi_pwm_master master, raspberrypi_pwm_channel channel, uint32_t range, uint32_t data)
	Main PWM initialization function. This functions sets up the PWM master, channel, duty cycle and GPIO pin.

Detailed Description

PWM Support.

Function Documentation

rtems_status_code rpi_pwm_init	(	raspberrypi_pwm_master	master,
		raspberrypi_pwm_channel	channel,
		uint32_t	range,
		uint32_t	data
	)

Main PWM initialization function. This functions sets up the PWM master, channel, duty cycle and GPIO pin.

Parameters

master	Selects the hardware instance to be used (raspberrypi_pwm_master0 = PWM0, raspberrypi_pwm_master1 = PWM1)
channel	Selects the channel for `master` (raspberrypi_pwm0 = PWMx_0, raspberrypi_pwm1 = PWMx_1)
range	Period register value (> 0)
data	Initial duty count, 1 – `range` (0 rejected)

rtems_status_code rpi_pwm_set_clock ( uint32_t divisor )

Set PWM clock divider.

Parameters

divisor 1 – 4095; PWMCLK = 19.2 MHz / divisor.

Return values

RTEMS_SUCCESSFUL	OK
RTEMS_INVALID_NUMBER	0 or >4095

rtems_status_code rpi_pwm_set_data	(	raspberrypi_pwm_master	master,
		raspberrypi_pwm_channel	channel,
		uint32_t	data
	)

Update duty-cycle register.

Parameters

master	Selects the hardware instance to be used (raspberrypi_pwm_master0 = PWM0, raspberrypi_pwm_master1 = PWM1)
channel	Selects the channel for `master` (raspberrypi_pwm0 = PWMx_0, raspberrypi_pwm1 = PWMx_1)
data	Initial duty count, 1 – current range value.(0 rejected)