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174 lines
6.4 KiB
174 lines
6.4 KiB
/**************************************************************************** |
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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 "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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/* Aquire data enable */ |
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stmpe811_putreg8(priv, STMPE811_TEMP_CTRL, (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, (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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/* 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 termperature 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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