121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
/****************************************************************************
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* boards/arm/stm32/stm32f334-disco/src/stm32_comp.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 <stdbool.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/board.h>
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#include <nuttx/analog/comp.h>
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#include "stm32.h"
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#if defined(CONFIG_COMP) && (defined(CONFIG_STM32_COMP2) || \
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defined(CONFIG_STM32_COMP4) || \
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defined(CONFIG_STM32_COMP6))
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#ifdef CONFIG_STM32_COMP2
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# if defined(CONFIG_STM32_COMP4) || defined(CONFIG_STM32_COMP6)
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# error "Currently only one COMP device supported"
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# endif
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#elif CONFIG_STM32_COMP4
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# if defined(CONFIG_STM32_COMP2) || defined(CONFIG_STM32_COMP6)
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# error "Currently only one COMP device supported"
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# endif
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#elif CONFIG_STM32_COMP6
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# if defined(CONFIG_STM32_COMP2) || defined(CONFIG_STM32_COMP4)
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# error "Currently only one COMP device supported"
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# endif
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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_comp_setup
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*
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* Description:
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* Initialize COMP
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*
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****************************************************************************/
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int stm32_comp_setup(void)
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{
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static bool initialized = false;
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struct comp_dev_s *comp = NULL;
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int ret;
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if (!initialized)
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{
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/* Get the comparator interface */
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#ifdef CONFIG_STM32_COMP2
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comp = stm32_compinitialize(2);
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if (comp == NULL)
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{
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aerr("ERROR: Failed to get COMP%d interface\n", 2);
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_STM32_COMP4
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comp = stm32_compinitialize(4);
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if (comp == NULL)
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{
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aerr("ERROR: Failed to get COMP%d interface\n", 4);
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_STM32_COMP6
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comp = stm32_compinitialize(6);
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if (comp == NULL)
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{
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aerr("ERROR: Failed to get COMP%d interface\n", 6);
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return -ENODEV;
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}
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#endif
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/* Register the comparator character driver at /dev/comp0 */
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ret = comp_register("/dev/comp0", comp);
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if (ret < 0)
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{
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aerr("ERROR: comp_register failed: %d\n", ret);
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return ret;
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}
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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_COMP && (CONFIG_STM32_COMP1 ||
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* CONFIG_STM32_COMP2
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* CONFIG_STM32_COMP6) */
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