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/************************************************************************************
* configs/tm4c123g-launchpad/tm4c_adc.c
*
* Copyright (C) 2015 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 "tiva_adc.h"
#include "tiva_timer.h"
#include "tm4c123g-launchpad.h"
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/************************************************************************************
* Private Data
************************************************************************************/
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: board_adc_initialize
*
* Description:
* Initialize and register the ADC driver
*
************************************************************************************/
#ifdef CONFIG_TIVA_ADC
int board_adc_initialize(void)
{
static bool initialized = false;
struct adc_dev_s *adc;
int ret;
/* Check if we have already initialized */
if (!initialized)
{
/* Call tiva_adcinitialize() to get an instance of the ADC interface */
adc = tiva_adc_initialize(0);
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;
}
/* Enable ADC interrupts */
adc->ad_ops->ao_rxint(adc, true);
/* Now we are initialized */
initialized = true;
}
return OK;
}
#endif /* CONFIG_ADC */
/************************************************************************************
* Name: adc_devinit
*
* Description:
* All Tiva architectures must provide the following interface to work with
* examples/adc.
*
************************************************************************************/
#ifdef CONFIG_EXAMPLES_ADC
int adc_devinit(void)
{
#ifdef CONFIG_TIVA_ADC
return board_adc_initialize();
#else
return -ENOSYS;
#endif
}
#endif /* CONFIG_EXAMPLES_ADC */
#if defined (CONFIG_TIVA_ADC) && defined (CONFIG_TIVA_TIMER)
/* Tiva timer interface does not currently support user configuration */
# if 0
/************************************************************************************
* Name: adc_timer_init
*
* Description:
* Inititalize timer specifically for ADC use.
*
************************************************************************************/
TIMER_HANDLE adc_timer_init(void)
{
struct tiva_gptm32config_s adctimer =
{
.cmn =
{
.gptm = 0;
.mode = TIMER32_MODE_PERIODIC;
.alternate = false;
};
.config =
{
.flags = TIMER_FLAG_ADCTIMEOUT;
.handler = NULL;
.u.periodic = TIVA_TIME_MS_TO_TICKS(100); // in clock ticks
};
};
return tiva_gptm_configure((const struct tiva_gptmconfig_s *)&adctimer);
}
# endif
#endif /* defined (CONFIG_TIVA_ADC) && defined (CONFIG_TIVA_TIMER) */
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