/************************************************************************************
* configs/sama5d3x-ek/src/sam_pwm.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/pwm.h>
#include <arch/board/board.h>
#include "sam_pwm.h"
#include "sama5d3x-ek.h"
/************************************************************************************
* Definitions
************************************************************************************/
/* Configuration ********************************************************************/
/* PWM. There are no dedicated PWM output pins available to the user for PWM
* testing. Care must be taken because all PWM output pins conflict with some other
* usage of the pin by other devices:
*
* -----+---+---+----+--------------------
* PWM PIN PER PIO CONFLICTS
* -----+---+---+----+--------------------
* PWM0 FI B PC28 SPI1, ISI
* H B PB0 GMAC
* B PA20 LCDC, ISI
* L B PB1 GMAC
* B PA21 LCDC, ISI
* -----+---+---+----+--------------------
* PWM1 FI B PC31 HDMI
* H B PB4 GMAC
* B PA22 LCDC, ISI
* L B PB5 GMAC
* B PE31 ISI, HDMI
* B PA23 LCDC, ISI
* -----+---+---+----+--------------------
* PWM2 FI B PC29 UART0, ISI, HDMI
* H C PD5 HSMCI0
* B PB8 GMAC
* L C PD6 HSMCI0
* B PB9 GMAC
* -----+---+---+----+--------------------
* PWM3 FI C PD16 SPI0, Audio
* H C PD7 HSMCI0
* B PB12 GMAC
* L C PD8 HSMCI0
* B PB13 GMAC
* -----+---+---+----+--------------------
*/
#ifndef CONFIG_SAMA5D3xEK_CHANNEL
# if defined(CONFIG_SAMA5_PWM_CHAN0)
# warning Assuming PWM channel 0
# define CONFIG_SAMA5D3xEK_CHANNEL 0
# elif defined(CONFIG_SAMA5_PWM_CHAN1)
# warning Assuming PWM channel 1
# define CONFIG_SAMA5D3xEK_CHANNEL 1
# elif defined(CONFIG_SAMA5_PWM_CHAN2)
# warning Assuming PWM channel 2
# define CONFIG_SAMA5D3xEK_CHANNEL 2
# elif defined(CONFIG_SAMA5_PWM_CHAN3)
# warning Assuming PWM channel 3
# define CONFIG_SAMA5D3xEK_CHANNEL 3
# endif
#endif
#if defined(CONFIG_PWM) && defined(CONFIG_SAMA5_PWM)
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: pwm_devinit
*
* Description:
* All SAMA5 architectures must provide the following interface to work with
* examples/pwm.
*
************************************************************************************/
int pwm_devinit(void)
{
static bool initialized = false;
struct pwm_lowerhalf_s *pwm;
int ret;
/* Have we already initialized? */
if (!initialized)
{
/* Call sam_pwminitialize() to get an instance of the PWM interface */
pwm = sam_pwminitialize(CONFIG_SAMA5D3xEK_CHANNEL);
if (!pwm)
{
dbg("Failed to get the SAMA5 PWM lower half\n");
return -ENODEV;
}
/* Register the PWM driver at "/dev/pwm0" */
ret = pwm_register("/dev/pwm0", pwm);
if (ret < 0)
{
adbg("pwm_register failed: %d\n", ret);
return ret;
}
/* Now we are initialized */
initialized = true;
}
return OK;
}
#endif /* CONFIG_PWM */
