Pulse width modulation library headers. More...

Macros
#define	BCM2708_PERI_BASE 0x20000000

#define	CLOCK_BASE (BCM2708_PERI_BASE + 0x101000) /* Clocks */

#define	GPIO_BASE (BCM2708_PERI_BASE + 0x200000) /* GPIO */

#define	PWM_BASE (BCM2708_PERI_BASE + 0x20C000) /* PWM */

#define	GPIO_SET0 (gpio+7) / Set GPIO high bits 0-31 */

#define	GPIO_SET1 (gpio+8) / Set GPIO high bits 32-53 */

#define	GPIO_CLR0 (gpio+10) / Set GPIO low bits 0-31 */

#define	GPIO_CLR1 (gpio+11) / Set GPIO low bits 32-53 */

#define	PWMCLK_CNTL *(clk+40)

#define	PWMCLK_DIV *(clk+41)

#define	PWM_CONTROL *pwm

#define	PWM_STATUS *(pwm+1)

#define	PWM0_RANGE *(pwm+4)

#define	PWM1_RANGE *(pwm+8)

#define	PWM0_DATA *(pwm+5)

#define	PWM1_DATA *(pwm+9)

#define	PWM1_MS_MODE 0x8000 /* Run in MS mode */

#define	PWM1_USEFIFO 0x2000 /* Data from FIFO */

#define	PWM1_REVPOLAR 0x1000 /* Reverse polarity */

#define	PWM1_OFFSTATE 0x0800 /* Ouput Off state */

#define	PWM1_REPEATFF 0x0400 /* Repeat last value if FIFO empty */

#define	PWM1_SERIAL 0x0200 /* Run in serial mode */

#define	PWM1_ENABLE 0x0100 /* Channel Enable */

#define	PWM0_MS_MODE 0x0080 /* Run in MS mode */

#define	PWM0_USEFIFO 0x0020 /* Data from FIFO */

#define	PWM0_REVPOLAR 0x0010 /* Reverse polarity */

#define	PWM0_OFFSTATE 0x0008 /* Ouput Off state */

#define	PWM0_REPEATFF 0x0004 /* Repeat last value if FIFO empty */

#define	PWM0_SERIAL 0x0002 /* Run in serial mode */

#define	PWM0_ENABLE 0x0001 /* Channel Enable */

#define	PWM_CLRFIFO 0x0040 /* Clear FIFO (Self clearing bit) */

#define	PWMS_BUSERR 0x0100 /* Register access was too fast */

#define	PAGE_SIZE (4*1024)

#define	BLOCK_SIZE (4*1024)

#define	INP_GPIO(g) (gpio+((g)/10)) &= ~(7<<(((g)%10)3))

#define	OUT_GPIO(g) (gpio+((g)/10)) \|= (1<<(((g)%10)3))

#define	SET_GPIO_ALT(g, a) (gpio+(((g)/10))) \|= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)3))

#define	GPIO_SET0 (gpio+7) / Set GPIO high bits 0-31 */

#define	GPIO_SET1 (gpio+8) / Set GPIO high bits 32-53 */

#define	GPIO_CLR0 (gpio+10) / Set GPIO low bits 0-31 */

#define	GPIO_CLR1 (gpio+11) / Set GPIO low bits 32-53 */

#define	GPIO_PULL (gpio+37) / Pull up/pull down */

#define	GPIO_PULLCLK0 (gpio+38) / Pull up/pull down clock */

Functions
int	pwm_init ()
	Initialise the PWM peripheral.

void	pwm_mode (unsigned int mode)
	Set mode for the PWM peripheral.

void	pwm_value (unsigned int value)
	Set PWM value.

void	pwm_release ()
	Releases the PWM peripheral and unmaps the memory.

Variables
const unsigned int	PWM_MAX = 1024

volatile unsigned int *	gpio

volatile unsigned int *	pwm

volatile unsigned int *	clk

Detailed Description

Pulse width modulation library headers.

Author: Omer Kilic omerk.nosp@m.ilic.nosp@m.@gmai.nosp@m.l.co.nosp@m.m - Erlang Solutions; Jeremy Bennett jerem.nosp@m.y.be.nosp@m.nnett.nosp@m.@emb.nosp@m.ecosm.nosp@m..com - Embecosm Limited

LICENSE

Copyright (C) 2013 Omer Kilic omerk.nosp@m.ilic.nosp@m.@gmai.nosp@m.l.co.nosp@m.m - Erlang Solutions Copyright (C) 2013 Jeremy Bennett jerem.nosp@m.y.be.nosp@m.nnett.nosp@m.@emb.nosp@m.ecosm.nosp@m..com - Embecosm Limited

This file is part of pihwm http://omerk.github.io/pihwm

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at:

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Definition in file pi_pwm.h.

Macros

Functions

Variables

Detailed Description

LICENSE