/boards/arm/stm32h7/stm32h747i-disco/src/stm32_adc.c
C | 227 lines | 103 code | 41 blank | 83 comment | 17 complexity | dd15a2f78462cab1ced220c3abcb4409 MD5 | raw file
Possible License(s): Apache-2.0
- /****************************************************************************
- * boards/arm/stm32h7/stm32h747i-disco/src/stm32_adc.c
- *
- * Copyright (C) 2019 Gregory Nutt. All rights reserved.
- * Authors: Gregory Nutt <gnutt@nuttx.org>
- * David Sidrane <david.sidrane@nscdg.com>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/board.h>
- #include <nuttx/analog/adc.h>
- #include <arch/board/board.h>
- #include "chip.h"
- #include "stm32_gpio.h"
- #include "stm32_adc.h"
- #include "stm32h747i-disco.h"
- #ifdef CONFIG_ADC
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- /* Configuration ************************************************************/
- /* Up to 3 ADC interfaces are supported */
- #if defined(CONFIG_STM32H7_ADC1) || defined(CONFIG_STM32H7_ADC2) || \
- defined(CONFIG_STM32H7_ADC3)
- #ifndef CONFIG_STM32H7_ADC1
- # warning "Channel information only available for ADC1"
- #endif
- /* The number of ADC channels in the conversion list */
- #define ADC1_NCHANNELS 5
- #define ADC3_NCHANNELS 1
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- #ifdef CONFIG_STM32H7_ADC1
- /* Identifying number of each ADC channel: Variable Resistor.
- *
- * ADC1: {5, 10, 12, 13, 15};
- */
- static const uint8_t g_adc1_chanlist[ADC1_NCHANNELS] =
- {
- 5, 10, 12, 13, 15
- };
- /* Configurations of pins used by each ADC channels
- *
- * ADC1: {GPIO_ADC12_INP5, GPIO_ADC123_INP10, GPIO_ADC123_INP12,
- * GPIO_ADC12_INP13, GPIO_ADC12_INP15};
- */
- static const uint32_t g_adc1_pinlist[ADC1_NCHANNELS] =
- {
- GPIO_ADC12_INP5, GPIO_ADC123_INP10, GPIO_ADC123_INP12, GPIO_ADC12_INP13,
- GPIO_ADC12_INP15
- };
- #endif
- #ifdef CONFIG_STM32H7_ADC3
- /* Identifying number of each ADC channel: Variable Resistor.
- *
- * ADC3: {6,};
- */
- static const uint8_t g_adc3_chanlist[ADC1_NCHANNELS] =
- {
- 6
- };
- /* Configurations of pins used by each ADC channels
- *
- *
- * ADC3: {GPIO_ADC3_INP6}
- */
- static const uint32_t g_adc3_pinlist[ADC3_NCHANNELS] =
- {
- GPIO_ADC3_INP6
- };
- #endif
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: stm32_adc_setup
- *
- * Description:
- * Initialize ADC and register the ADC driver.
- *
- ****************************************************************************/
- int stm32_adc_setup(void)
- {
- #if defined(CONFIG_STM32H7_ADC1) || defined(CONFIG_STM32H7_ADC3)
- static bool initialized = false;
- struct adc_dev_s *adc;
- int ret;
- int i;
- char devname[] = "/dev/adc0";
- /* Check if we have already initialized */
- if (!initialized)
- {
- #endif
- #if defined(CONFIG_STM32H7_ADC1)
- /* Configure the pins as analog inputs for the selected channels */
- for (i = 0; i < ADC1_NCHANNELS; i++)
- {
- if (g_adc1_pinlist[i] != 0)
- {
- stm32_configgpio(g_adc1_pinlist[i]);
- }
- }
- /* Call stm32_adcinitialize() to get an instance of the ADC interface */
- adc = stm32h7_adc_initialize(1, g_adc1_chanlist, ADC1_NCHANNELS);
- if (adc == NULL)
- {
- aerr("ERROR: Failed to get ADC1 interface\n");
- return -ENODEV;
- }
- /* Register the ADC driver at "/dev/adc0" */
- ret = adc_register(devname, adc);
- if (ret < 0)
- {
- aerr("ERROR: adc_register(%s) failed: %d\n", devname, ret);
- return ret;
- }
- devname[8]++;
- #endif
- #if defined(CONFIG_STM32H7_ADC3)
- /* Configure the pins as analog inputs for the selected channels */
- for (i = 0; i < ADC3_NCHANNELS; i++)
- {
- if (g_adc3_pinlist[i] != 0)
- {
- stm32_configgpio(g_adc3_pinlist[i]);
- }
- }
- /* Call stm32_adcinitialize() to get an instance of the ADC interface */
- adc = stm32h7_adc_initialize(3, g_adc3_chanlist, ADC3_NCHANNELS);
- if (adc == NULL)
- {
- aerr("ERROR: Failed to get ADC3 interface\n");
- return -ENODEV;
- }
- /* Register the ADC driver at "/dev/adc0 or 1" */
- ret = adc_register(devname, adc);
- if (ret < 0)
- {
- aerr("ERROR: adc_register(%s) failed: %d\n", devname, ret);
- return ret;
- }
- #endif
- #if defined(CONFIG_STM32H7_ADC1) || defined(CONFIG_STM32H7_ADC3)
- /* Now we are initialized */
- initialized = true;
- }
- return OK;
- #else
- return -ENOSYS;
- #endif
- }
- #endif /* CONFIG_STM32H7_ADC1 || CONFIG_STM32H7_ADC2 || CONFIG_STM32H7_ADC3 */
- #endif /* CONFIG_ADC */