110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/****************************************************************************
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* boards/arm/stm32/stm32f4discovery/src/stm32_capture.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/capture.h>
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#include <arch/board/board.h>
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#include "chip.h"
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#include "stm32.h"
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#include "stm32_capture.h"
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#include "arm_internal.h"
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#include "stm32f4discovery.h"
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#if defined(CONFIG_CAPTURE)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Capture
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*
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* The stm32f4discovery has no real on-board pwm capture devices, but the
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* board can be configured to capture pwm using TIM3 CH2 PB5.
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*/
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#define HAVE_CAPTURE 1
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#ifndef CONFIG_CAPTURE
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# undef HAVE_CAPTURE
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#endif
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#ifndef CONFIG_STM32_TIM3
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# undef HAVE_CAPTURE
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#endif
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#ifndef CONFIG_STM32_TIM3_CAP
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# undef HAVE_CAPTURE
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#endif
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#if !defined(CONFIG_STM32_TIM3_CHANNEL) || CONFIG_STM32_TIM3_CHANNEL != STM32F4DISCOVERY_CAPTURECHANNEL
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# undef HAVE_CAPTURE
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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_capture_setup
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*
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* Description:
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* Initialize and register the pwm capture driver.
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*
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* Input parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/capture0"
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int stm32_capture_setup(const char *devpath)
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{
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#ifdef HAVE_CAPTURE
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struct cap_lowerhalf_s *capture;
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int ret;
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capture = stm32_cap_initialize(STM32F4DISCOVERY_CAPTURETIMER);
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/* Then register the pwm capture sensor */
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ret = cap_register(devpath, capture);
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if (ret < 0)
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{
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mtrerr("ERROR: Error registering capture\n");
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}
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return ret;
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#else
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return -ENODEV;
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#endif
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}
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#endif /* CONFIG_CAPTURE */
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