diff options
Diffstat (limited to 'nuttx/drivers/input/stmpe811_adc.c')
-rw-r--r-- | nuttx/drivers/input/stmpe811_adc.c | 266 |
1 files changed, 0 insertions, 266 deletions
diff --git a/nuttx/drivers/input/stmpe811_adc.c b/nuttx/drivers/input/stmpe811_adc.c deleted file mode 100644 index 1ffe987e6..000000000 --- a/nuttx/drivers/input/stmpe811_adc.c +++ /dev/null @@ -1,266 +0,0 @@ -/**************************************************************************** - * drivers/input/stmpe811_adc.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 <unistd.h> -#include <assert.h> -#include <errno.h> -#include <debug.h> - -#include <nuttx/arch.h> -#include <nuttx/input/stmpe811.h> - -#include "stmpe811.h" - -#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811) && !defined(CONFIG_STMPE811_ADC_DISABLE) - -/**************************************************************************** - * Private Types - ****************************************************************************/ - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: stmpe811_adcinitialize - * - * Description: - * Configure for ADC mode operation. Set overall ADC ADC timing that - * applies to all pins. - * - * 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_adcinitialize(STMPE811_HANDLE handle) -{ - FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle; - uint8_t regval; - int ret; - - DEBUGASSERT(handle); - - /* Get exclusive access to the device structure */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - int errval = errno; - idbg("sem_wait failed: %d\n", errval); - return -errval; - } - - /* Enable Clocking for ADC */ - - regval = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2); - regval &= ~SYS_CTRL2_ADC_OFF; - stmpe811_putreg8(priv, STMPE811_SYS_CTRL2, regval); - - /* Select Sample Time, bit number and ADC Reference */ - - stmpe811_putreg8(priv, STMPE811_ADC_CTRL1, priv->config->ctrl1); - - /* Wait for 20 ms */ - - up_mdelay(20); - - /* Select the ADC clock speed */ - - stmpe811_putreg8(priv, STMPE811_ADC_CTRL2, priv->config->ctrl2); - - /* Mark ADC initialized */ - - priv->flags |= STMPE811_FLAGS_ADC_INITIALIZED; - sem_post(&priv->exclsem); - return OK; -} - -/**************************************************************************** - * Name: stmpe811_adcconfig - * - * Description: - * Configure a pin for ADC input. - * - * Input Parameters: - * handle - The handle previously returned by stmpe811_instantiate - * pin - The ADC pin number - * - * Returned Value: - * Zero is returned on success. Otherwise, a negated errno value is - * returned to indicate the nature of the failure. - * - ****************************************************************************/ - -int stmpe811_adcconfig(STMPE811_HANDLE handle, int pin) -{ - FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle; - uint8_t pinmask = GPIO_PIN(pin); - uint8_t regval; - int ret; - - DEBUGASSERT(handle && (unsigned)pin < STMPE811_ADC_NPINS); - - /* Get exclusive access to the device structure */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - int errval = errno; - idbg("sem_wait failed: %d\n", errval); - return -errval; - } - - /* Make sure that the pin is not already in use */ - - if ((priv->inuse & pinmask) != 0) - { - idbg("PIN%d is already in-use\n", pin); - sem_post(&priv->exclsem); - return -EBUSY; - } - - /* Clear the alternate function bit for the pin, making it an ADC input - * (or perhaps an an external reference, depending on the state of the - * ADC_CTRL1_REF_SEL bit). - */ - - regval = stmpe811_getreg8(priv, STMPE811_GPIO_AF); - regval &= ~pinmask; - stmpe811_putreg8(priv, STMPE811_GPIO_AF, regval); - - /* Mark the pin as 'in use' */ - - priv->inuse |= pinmask; - sem_post(&priv->exclsem); - return OK; -} - -/**************************************************************************** - * Name: stmpe811_adcread - * - * Description: - * Read the converted analog input value from the select pin. - * - * Input Parameters: - * handle - The handle previously returned by stmpe811_instantiate - * pin - The ADC pin number - * - * Returned Value: - * The converted value (there is no error reporting mechanism). - * - ****************************************************************************/ - -uint16_t stmpe811_adcread(STMPE811_HANDLE handle, int pin) -{ - FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle; - uint8_t pinmask = GPIO_PIN(pin); - uint8_t regval; - int i; - int ret; - - DEBUGASSERT(handle && (unsigned)pin < 8); - - /* Get exclusive access to the device structure */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - int errval = errno; - idbg("sem_wait failed: %d\n", errval); - return -errval; - } - - /* Request AD conversion by setting the bit corresponding the pin in the - * ADC CAPT register. - */ - - stmpe811_putreg8(priv, STMPE811_ADC_CAPT, pinmask); - - /* Wait for the conversion to complete. The ADC CAPT register reads '1' - * if conversion is completed. Reads '0' if conversion is in progress. - * Try three times before giving up. - */ - - for (i = 0; i < 3; i++) - { - /* The worst case ADC conversion time is (nominally) 56.4 uS. The - * following usleep() looks nice but in reality, the usleep() - * does not have that kind of precision (it will probably end up - * waiting 10 MS). - */ - - usleep(57); - - /* Check if the conversion is complete */ - - regval = stmpe811_getreg8(priv, STMPE811_ADC_CAPT); - if ((regval & pinmask) != 0) - { - break; - } - } - - /* At the completion of the conversion, return whatever we read from - * from the channel register associated with the pin. - */ - - return stmpe811_getreg16(priv, STMPE811_ADC_DATACH(pin)); -} - -#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 && !CONFIG_STMPE811_ADC_DISABLE */ - |