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266 lines
8.1 KiB
266 lines
8.1 KiB
/**************************************************************************** |
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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® 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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