162 lines
5.6 KiB
C
162 lines
5.6 KiB
C
/************************************************************************************
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* configs/sama5d4-ek/src/sam_pwm.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/pwm.h>
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#include <arch/board/board.h>
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#include "sam_pwm.h"
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#include "sama5d4-ek.h"
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/* Configuration ********************************************************************/
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/* PWM. There are no dedicated PWM output pins available to the user for PWM
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* testing. Care must be taken because all PWM output pins conflict with some other
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* usage of the pin by other devices:
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*
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* -----+---+---+----+--------------------
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* PWM PIN PER PIO CONFLICTS
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* -----+---+---+----+--------------------
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* PWM0 FI B PC28 SPI1, ISI
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* H B PB0 GMAC
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* B PA20 LCDC, ISI
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* L B PB1 GMAC
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* B PA21 LCDC, ISI
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* -----+---+---+----+--------------------
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* PWM1 FI B PC31 HDMI
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* H B PB4 GMAC
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* B PA22 LCDC, ISI
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* L B PB5 GMAC
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* B PE31 ISI, HDMI
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* B PA23 LCDC, ISI
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* -----+---+---+----+--------------------
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* PWM2 FI B PC29 UART0, ISI, HDMI
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* H C PD5 HSMCI0
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* B PB8 GMAC
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* L C PD6 HSMCI0
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* B PB9 GMAC
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* -----+---+---+----+--------------------
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* PWM3 FI C PD16 SPI0, Audio
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* H C PD7 HSMCI0
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* B PB12 GMAC
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* L C PD8 HSMCI0
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* B PB13 GMAC
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* -----+---+---+----+--------------------
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*/
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#ifndef CONFIG_SAMA5D4EK_CHANNEL
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# if defined(CONFIG_SAMA5_PWM_CHAN0)
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# warning Assuming PWM channel 0
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# define CONFIG_SAMA5D4EK_CHANNEL 0
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# elif defined(CONFIG_SAMA5_PWM_CHAN1)
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# warning Assuming PWM channel 1
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# define CONFIG_SAMA5D4EK_CHANNEL 1
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# elif defined(CONFIG_SAMA5_PWM_CHAN2)
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# warning Assuming PWM channel 2
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# define CONFIG_SAMA5D4EK_CHANNEL 2
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# elif defined(CONFIG_SAMA5_PWM_CHAN3)
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# warning Assuming PWM channel 3
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# define CONFIG_SAMA5D4EK_CHANNEL 3
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# endif
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#endif
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#if defined(CONFIG_PWM) && defined(CONFIG_SAMA5_PWM)
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: pwm_devinit
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*
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* Description:
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* All SAMA5 architectures must provide the following interface to work with
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* examples/pwm.
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*
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************************************************************************************/
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int pwm_devinit(void)
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{
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static bool initialized = false;
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struct pwm_lowerhalf_s *pwm;
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int ret;
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/* Have we already initialized? */
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if (!initialized)
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{
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/* Call sam_pwminitialize() to get an instance of the PWM interface */
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pwm = sam_pwminitialize(CONFIG_SAMA5D4EK_CHANNEL);
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if (!pwm)
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{
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dbg("Failed to get the SAMA5 PWM lower half\n");
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return -ENODEV;
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}
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/* Register the PWM driver at "/dev/pwm0" */
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ret = pwm_register("/dev/pwm0", pwm);
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if (ret < 0)
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{
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adbg("pwm_register failed: %d\n", ret);
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return ret;
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}
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/* Now we are initialized */
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initialized = true;
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}
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return OK;
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}
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#endif /* CONFIG_PWM */
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