diff options
Diffstat (limited to 'nuttx/drivers/input/stmpe811_temp.c')
-rw-r--r-- | nuttx/drivers/input/stmpe811_temp.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/nuttx/drivers/input/stmpe811_temp.c b/nuttx/drivers/input/stmpe811_temp.c new file mode 100644 index 000000000..0fefd2069 --- /dev/null +++ b/nuttx/drivers/input/stmpe811_temp.c @@ -0,0 +1,174 @@ +/**************************************************************************** + * 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 */ + |