142 lines
4.4 KiB
C
142 lines
4.4 KiB
C
/************************************************************************************
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* configs/stm32f4discovery/src/stm32_pwm.c
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*
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* Copyright (C) 2011 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 <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 "chip.h"
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#include "up_arch.h"
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#include "stm32_pwm.h"
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#include "stm32f4discovery.h"
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/* Configuration *******************************************************************/
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/* PWM
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*
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* The stm32f4discovery has no real on-board PWM devices, but the board can be configured to output
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* a pulse train using TIM4 CH2. This pin is used by FSMC is connect to CN5 just for this
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* purpose:
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*
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* PD13 FSMC_A18 / MC_TIM4_CH2OUT pin 33 (EnB)
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*
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* FSMC must be disabled in this case!
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*/
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#define HAVE_PWM 1
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#ifndef CONFIG_PWM
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# undef HAVE_PWM
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#endif
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#ifndef CONFIG_STM32_TIM4
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# undef HAVE_PWM
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#endif
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#ifndef CONFIG_STM32_TIM4_PWM
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# undef HAVE_PWM
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#endif
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#if CONFIG_STM32_TIM4_CHANNEL != STM32F4DISCOVERY_PWMCHANNEL
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# undef HAVE_PWM
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#endif
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#ifdef HAVE_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 STM32 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 stm32_pwminitialize() to get an instance of the PWM interface */
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pwm = stm32_pwminitialize(STM32F4DISCOVERY_PWMTIMER);
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if (!pwm)
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{
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dbg("Failed to get the STM32 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 /* HAVE_PWM */
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