155 lines
4.2 KiB
C
155 lines
4.2 KiB
C
/****************************************************************************
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* boards/arm/stm32/olimex-stm32-p407/src/stm32_adc.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/board.h>
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#include <nuttx/analog/adc.h>
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#include <arch/board/board.h>
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#include "chip.h"
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#include "stm32_adc.h"
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#include "olimex-stm32-p407.h"
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#ifdef CONFIG_ADC
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Up to 3 ADC interfaces are supported */
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#if STM32_NADC < 3
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# undef CONFIG_STM32_ADC3
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#endif
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#if STM32_NADC < 2
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# undef CONFIG_STM32_ADC2
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#endif
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#if STM32_NADC < 1
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# undef CONFIG_STM32_ADC1
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#endif
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#if defined(CONFIG_STM32_ADC1) || defined(CONFIG_STM32_ADC2) || defined(CONFIG_STM32_ADC3)
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#ifndef CONFIG_STM32_ADC1
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# warning "Channel information only available for ADC1"
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#endif
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/* The number of ADC channels in the conversion list */
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#define ADC1_NCHANNELS 1
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* The Olimex STM32-P407 has a 10 Kohm potentiometer AN_TR connected to PC0
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* ADC123_IN10
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*/
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/* Identifying number of each ADC channel: Variable Resistor. */
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#ifdef CONFIG_STM32_ADC1
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static const uint8_t g_chanlist[ADC1_NCHANNELS] =
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{
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10
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};
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/* Configurations of pins used byte each ADC channels */
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static const uint32_t g_pinlist[ADC1_NCHANNELS] =
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{
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GPIO_ADC1_IN10
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};
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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_adc_setup
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*
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* Description:
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* Initialize ADC and register the ADC driver.
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*
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****************************************************************************/
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int stm32_adc_setup(void)
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{
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#ifdef CONFIG_STM32_ADC1
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static bool initialized = false;
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struct adc_dev_s *adc;
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int ret;
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int i;
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/* Check if we have already initialized */
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if (!initialized)
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{
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/* Configure the pins as analog inputs for the selected channels */
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for (i = 0; i < ADC1_NCHANNELS; i++)
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{
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stm32_configgpio(g_pinlist[i]);
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}
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/* Call stm32_adcinitialize() to get an instance of the ADC interface */
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adc = stm32_adcinitialize(1, g_chanlist, ADC1_NCHANNELS);
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if (adc == NULL)
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{
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aerr("ERROR: Failed to get ADC interface\n");
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return -ENODEV;
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}
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/* Register the ADC driver at "/dev/adc0" */
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ret = adc_register("/dev/adc0", adc);
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if (ret < 0)
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{
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aerr("ERROR: adc_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 -ENOSYS;
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#endif
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}
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#endif /* CONFIG_STM32_ADC1 || CONFIG_STM32_ADC2 || CONFIG_STM32_ADC3 */
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#endif /* CONFIG_ADC */
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