forked from Archive/PX4-Autopilot
267 lines
8.1 KiB
C
267 lines
8.1 KiB
C
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/****************************************************************************
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* drivers/input/stmpe811_adc.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* References:
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* "STMPE811 S-Touch<63> advanced resistive touchscreen controller with 8-bit
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* GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics"
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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 <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/input/stmpe811.h>
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#include "stmpe811.h"
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811) && !defined(CONFIG_STMPE811_ADC_DISABLE)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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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: stmpe811_adcinitialize
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*
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* Description:
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* Configure for ADC mode operation. Set overall ADC ADC timing that
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* applies to all pins.
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*
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* Input Parameters:
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* handle - The handle previously returned by stmpe811_instantiate
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int stmpe811_adcinitialize(STMPE811_HANDLE handle)
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{
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FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle;
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uint8_t regval;
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int ret;
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DEBUGASSERT(handle);
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/* Get exclusive access to the device structure */
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ret = sem_wait(&priv->exclsem);
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if (ret < 0)
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{
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int errval = errno;
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idbg("sem_wait failed: %d\n", errval);
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return -errval;
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}
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/* Enable Clocking for ADC */
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regval = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2);
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regval &= ~SYS_CTRL2_ADC_OFF;
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stmpe811_putreg8(priv, STMPE811_SYS_CTRL2, regval);
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/* Select Sample Time, bit number and ADC Reference */
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stmpe811_putreg8(priv, STMPE811_ADC_CTRL1, priv->config->ctrl1);
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/* Wait for 20 ms */
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up_mdelay(20);
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/* Select the ADC clock speed */
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stmpe811_putreg8(priv, STMPE811_ADC_CTRL2, priv->config->ctrl2);
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/* Mark ADC initialized */
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priv->flags |= STMPE811_FLAGS_ADC_INITIALIZED;
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sem_post(&priv->exclsem);
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return OK;
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}
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/****************************************************************************
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* Name: stmpe811_adcconfig
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*
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* Description:
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* Configure a pin for ADC input.
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*
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* Input Parameters:
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* handle - The handle previously returned by stmpe811_instantiate
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* pin - The ADC pin number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int stmpe811_adcconfig(STMPE811_HANDLE handle, int pin)
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{
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FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle;
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uint8_t pinmask = GPIO_PIN(pin);
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uint8_t regval;
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int ret;
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DEBUGASSERT(handle && (unsigned)pin < STMPE811_ADC_NPINS);
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/* Get exclusive access to the device structure */
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ret = sem_wait(&priv->exclsem);
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if (ret < 0)
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{
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int errval = errno;
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idbg("sem_wait failed: %d\n", errval);
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return -errval;
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}
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/* Make sure that the pin is not already in use */
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if ((priv->inuse & pinmask) != 0)
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{
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idbg("PIN%d is already in-use\n", pin);
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sem_post(&priv->exclsem);
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return -EBUSY;
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}
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/* Clear the alternate function bit for the pin, making it an ADC input
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* (or perhaps an an external reference, depending on the state of the
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* ADC_CTRL1_REF_SEL bit).
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*/
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regval = stmpe811_getreg8(priv, STMPE811_GPIO_AF);
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regval &= ~pinmask;
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stmpe811_putreg8(priv, STMPE811_GPIO_AF, regval);
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/* Mark the pin as 'in use' */
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priv->inuse |= pinmask;
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sem_post(&priv->exclsem);
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return OK;
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}
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/****************************************************************************
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* Name: stmpe811_adcread
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*
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* Description:
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* Read the converted analog input value from the select pin.
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*
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* Input Parameters:
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* handle - The handle previously returned by stmpe811_instantiate
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* pin - The ADC pin number
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*
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* Returned Value:
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* The converted value (there is no error reporting mechanism).
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*
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****************************************************************************/
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uint16_t stmpe811_adcread(STMPE811_HANDLE handle, int pin)
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{
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FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle;
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uint8_t pinmask = GPIO_PIN(pin);
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uint8_t regval;
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int i;
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int ret;
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DEBUGASSERT(handle && (unsigned)pin < 8);
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/* Get exclusive access to the device structure */
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ret = sem_wait(&priv->exclsem);
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if (ret < 0)
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{
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int errval = errno;
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idbg("sem_wait failed: %d\n", errval);
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return -errval;
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}
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/* Request AD conversion by setting the bit corresponding the pin in the
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* ADC CAPT register.
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*/
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stmpe811_putreg8(priv, STMPE811_ADC_CAPT, pinmask);
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/* Wait for the conversion to complete. The ADC CAPT register reads '1'
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* if conversion is completed. Reads '0' if conversion is in progress.
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* Try three times before giving up.
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*/
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for (i = 0; i < 3; i++)
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{
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/* The worst case ADC conversion time is (nominally) 56.4 uS. The
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* following usleep() looks nice but in reality, the usleep()
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* does not have that kind of precision (it will probably end up
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* waiting 10 MS).
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*/
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usleep(57);
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/* Check if the conversion is complete */
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regval = stmpe811_getreg8(priv, STMPE811_ADC_CAPT);
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if ((regval & pinmask) != 0)
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{
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break;
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}
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}
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/* At the completion of the conversion, return whatever we read from
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* from the channel register associated with the pin.
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*/
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return stmpe811_getreg16(priv, STMPE811_ADC_DATACH(pin));
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}
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#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 && !CONFIG_STMPE811_ADC_DISABLE */
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