179 lines
6.5 KiB
C
179 lines
6.5 KiB
C
/****************************************************************************
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* drivers/input/stmpe811_temp.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® 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 <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/input/stmpe811.h>
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#include <nuttx/random.h>
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#include "stmpe811.h"
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811) && !defined(CONFIG_STMPE811_TEMP_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_tempinitialize
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*
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* Description:
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* Configure the temperature sensor.
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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_tempinitialize(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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/* Enable clocking for ADC and the temperature sensor */
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regval = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2);
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regval &= ~(SYS_CTRL2_TS_OFF | SYS_CTRL2_ADC_OFF);
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stmpe811_putreg8(priv, STMPE811_SYS_CTRL2, regval);
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/* Enable the temperature sensor */
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stmpe811_putreg8(priv, STMPE811_TEMP_CTRL, TEMP_CTRL_ENABLE);
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/* Acquire data enable */
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stmpe811_putreg8(priv, STMPE811_TEMP_CTRL,
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(TEMP_CTRL_ACQ | TEMP_CTRL_ENABLE));
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return OK;
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}
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/****************************************************************************
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* Name: stmpe811_tempread
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*
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* Description:
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* Configure the temperature sensor.
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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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uint16_t stmpe811_tempread(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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uint32_t temp = 0;
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uint8_t temp1;
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uint8_t temp2;
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/* Acquire data enable */
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stmpe811_putreg8(priv, STMPE811_TEMP_CTRL,
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(TEMP_CTRL_ACQ | TEMP_CTRL_ENABLE));
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/* Read the temperature */
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temp1 = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2);
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temp2 = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2+1);
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add_sensor_randomness((temp1 << 8) | temp2);
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/* Scale the temperature (where Vio is assumed to be .33) */
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temp = ((uint32_t)(temp1 & 3) << 8) | temp2;
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temp = (uint32_t)((33 * temp * 100) / 751);
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temp = (uint32_t)((temp + 5) / 10);
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return (uint16_t)temp;
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}
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/****************************************************************************
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* Name: stmpe811_tempinterrupt
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*
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* Description:
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* Configure the temperature sensor to sample the temperature periodically.
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* Set the temperature threshold to generate an interrupt and notify
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* to the client using the provide callback function pointer.
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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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* threshold - The threshold temperature value
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* direction - True: Generate an interrupt if the temperate exceeds the
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* threshold value; False: Generate an interrupt if the
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* temperature falls below the threshold value.
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* callback - The client callback function that will be called when
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* the temperature crosses the threshold.
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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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/* Not implemented */
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#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 && !CONFIG_STMPE811_TEMP_DISABLE */
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