/nuttx/configs/stm3240g-eval/src/up_adc.c
C | 168 lines | 62 code | 35 blank | 71 comment | 7 complexity | 0aca69db3d180c7cfae5a3b040cd36e0 MD5 | raw file
- /************************************************************************************
- * configs/stm3240g-eval/src/up_adc.c
- * arch/arm/src/board/up_adc.c
- *
- * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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/analog/adc.h>
- #include <arch/board/board.h>
- #include "chip.h"
- #include "up_arch.h"
- #include "stm32_pwm.h"
- #include "stm3240g-internal.h"
- #ifdef CONFIG_ADC
- /************************************************************************************
- * Definitions
- ************************************************************************************/
- /* Configuration ************************************************************/
- /* Up to 3 ADC interfaces are supported */
- #if STM32_NADC < 3
- # undef CONFIG_STM32_ADC3
- #endif
- #if STM32_NADC < 2
- # undef CONFIG_STM32_ADC2
- #endif
- #if STM32_NADC < 1
- # undef CONFIG_STM32_ADC1
- #endif
- #if defined(CONFIG_STM32_ADC1) || defined(CONFIG_STM32_ADC2) || defined(CONFIG_STM32_ADC3)
- #ifndef CONFIG_STM32_ADC3
- # warning "Channel information only available for ADC3"
- #endif
- /* The number of ADC channels in the conversion list */
- #define ADC3_NCHANNELS 1
- /************************************************************************************
- * Private Data
- ************************************************************************************/
- /* The STM3240G-EVAL has a 10 Kohm potentiometer RV1 connected to PF9 of
- * STM32F407IGH6 on the board: TIM14_CH1/FSMC_CD/ADC3_IN7
- */
- /* Identifying number of each ADC channel: Variable Resistor. */
- #ifdef CONFIG_STM32_ADC3
- static const uint8_t g_chanlist[ADC3_NCHANNELS] = {7};
- /* Configurations of pins used byte each ADC channels */
- static const uint32_t g_pinlist[ADC3_NCHANNELS] = {GPIO_ADC3_IN7};
- #endif
- /************************************************************************************
- * Private Functions
- ************************************************************************************/
- /************************************************************************************
- * Public Functions
- ************************************************************************************/
- /************************************************************************************
- * Name: adc_devinit
- *
- * Description:
- * All STM32 architectures must provide the following interface to work with
- * examples/adc.
- *
- ************************************************************************************/
- int adc_devinit(void)
- {
- #ifdef CONFIG_STM32_ADC3
- static bool initialized = false;
- struct adc_dev_s *adc;
- int ret;
- int i;
- /* Check if we have already initialized */
- if (!initialized)
- {
- /* Configure the pins as analog inputs for the selected channels */
- for (i = 0; i < ADC3_NCHANNELS; i++)
- {
- stm32_configgpio(g_pinlist[i]);
- }
- /* Call stm32_adcinitialize() to get an instance of the ADC interface */
- adc = stm32_adcinitialize(3, g_chanlist, ADC3_NCHANNELS);
- if (adc == NULL)
- {
- adbg("ERROR: Failed to get ADC interface\n");
- return -ENODEV;
- }
- /* Register the ADC driver at "/dev/adc0" */
- ret = adc_register("/dev/adc0", adc);
- if (ret < 0)
- {
- adbg("adc_register failed: %d\n", ret);
- return ret;
- }
- /* Now we are initialized */
- initialized = true;
- }
- return OK;
- #else
- return -ENOSYS;
- #endif
- }
- #endif /* CONFIG_STM32_ADC1 || CONFIG_STM32_ADC2 || CONFIG_STM32_ADC3 */
- #endif /* CONFIG_ADC */