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/************************************************************************************
* configs/stm3220g-eval/src/up_adc.c
* arch/arm/src/board/up_adc.c
*
* Copyright (C) 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 "stm3220g-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 STM3220G-EVAL has a 10 Kohm potentiometer RV1 connected to PF9 of
* STM32F207IGH6 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 */
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