/****************************************************************************
* drivers/input/stmpe811_temp.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
* "STMPE811 S-Touch� advanced resistive touchscreen controller with 8-bit
* GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics"
*
* 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 <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/input/stmpe811.h>
#include "stmpe811.h"
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811) && !defined(CONFIG_STMPE811_TEMP_DISABLE)
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stmpe811_tempinitialize
*
* Description:
* Configure the temperature sensor.
*
* Input Parameters:
* handle - The handle previously returned by stmpe811_instantiate
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
int stmpe811_tempinitialize(STMPE811_HANDLE handle)
{
FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle;
uint8_t regval;
/* Enable clocking for ADC and the temperature sensor */
regval = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2);
regval &= ~(SYS_CTRL2_TS_OFF | SYS_CTRL2_ADC_OFF);
stmpe811_putreg8(priv, STMPE811_SYS_CTRL2, regval);
/* Enable the temperature sensor */
stmpe811_putreg8(priv, STMPE811_TEMP_CTRL, TEMP_CTRL_ENABLE);
/* Aquire data enable */
stmpe811_putreg8(priv, STMPE811_TEMP_CTRL, (TEMP_CTRL_ACQ|TEMP_CTRL_ENABLE));
return OK;
}
/****************************************************************************
* Name: stmpe811_tempread
*
* Description:
* Configure the temperature sensor.
*
* Input Parameters:
* handle - The handle previously returned by stmpe811_instantiate
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
uint16_t stmpe811_tempread(STMPE811_HANDLE handle)
{
FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle;
uint32_t temp = 0;
uint8_t temp1;
uint8_t temp2;
/* Acquire data enable */
stmpe811_putreg8(priv, STMPE811_TEMP_CTRL, (TEMP_CTRL_ACQ|TEMP_CTRL_ENABLE));
/* Read the temperature */
temp1 = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2);
temp2 = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2+1);
/* Scale the temperature (where Vio is assumed to be .33) */
temp = ((uint32_t)(temp1 & 3) << 8) | temp2;
temp = (uint32_t)((33 * temp * 100) / 751);
temp = (uint32_t)((temp + 5) / 10);
return (uint16_t)temp;
}
/****************************************************************************
* Name: stmpe811_tempinterrupt
*
* Description:
* Configure the temperature sensor to sample the temperature periodically.
* Set the temperature threshold to generate an interrupt and notify
* to the client using the provide callback function pointer.
*
* Input Parameters:
* handle - The handle previously returned by stmpe811_instantiate
* threshold - The threshold temperature value
* direction - True: Generate an interrupt if the temperate exceeds the
* threshold value; False: Generate an interrupt if the
* temperature falls below the threshold value.
* callback - The client callback function that will be called when
* the termperature crosses the threshold.
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
/* Not implemented */
#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 && !CONFIG_STMPE811_TEMP_DISABLE */
