118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
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/************************************************************************************
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* configs/sama5d4-ek/src/up_adc.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/analog/adc.h>
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#include "sam_adc.h"
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#include "sama5d4-ek.h"
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#ifdef CONFIG_ADC
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/* Configuration ********************************************************************/
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/************************************************************************************
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* Private Data
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************************************************************************************/
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: adc_devinit
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*
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* Description:
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* All STM32 architectures must provide the following interface to work with
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* examples/adc.
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*
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************************************************************************************/
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int adc_devinit(void)
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{
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#ifdef CONFIG_SAMA5_ADC
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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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/* Check if we have already initialized */
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if (!initialized)
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{
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/* Call stm32_adcinitialize() to get an instance of the ADC interface */
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adc = sam_adc_initialize();
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if (adc == NULL)
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{
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adbg("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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adbg("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_ADC */
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