124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/****************************************************************************
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* boards/arm/stm32/stm32f4discovery/src/stm32_pwm.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/timers/pwm.h>
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#include <arch/board/board.h>
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#include "chip.h"
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#include "arm_internal.h"
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#include "stm32_pwm.h"
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#include "stm32f4discovery.h"
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/****************************************************************************
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* Pre-processor 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
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* be configured to output a pulse train using TIM4 CH2. This pin is used by
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* FSMC is connected to CN5 just for this 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 !defined(CONFIG_STM32_TIM4_CHANNEL) || CONFIG_STM32_TIM4_CHANNEL != STM32F4DISCOVERY_PWMCHANNEL
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# undef HAVE_PWM
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_pwm_setup
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*
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* Description:
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* Initialize PWM and register the PWM device.
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*
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****************************************************************************/
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int stm32_pwm_setup(void)
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{
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#ifdef HAVE_PWM
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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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aerr("ERROR: 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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aerr("ERROR: 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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#else
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return -ENODEV;
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#endif
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}
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