The ADS7843E driver skeleton at least compiles now
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4014 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
parent
d02a44a113
commit
43e69f745d
@ -2,7 +2,8 @@
|
||||
* drivers/input/ads7843e.c
|
||||
*
|
||||
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
|
||||
* Author: Gregory Nutt <gnutt@nuttx.org>
|
||||
* Authors: Gregory Nutt <gnutt@nuttx.org>
|
||||
* Diego Sanchez <dsanchez@nx-engineering.com>
|
||||
*
|
||||
* References:
|
||||
* "Touch Screen Controller, ADS7843," Burr-Brown Products from Texas
|
||||
@ -144,6 +145,18 @@ struct ads7843e_dev_s
|
||||
/****************************************************************************
|
||||
* Private Function Prototypes
|
||||
****************************************************************************/
|
||||
/* Low-level SPI helpers */
|
||||
|
||||
static inline void ads7843e_configspi(FAR struct spi_dev_s *spi);
|
||||
#ifdef CONFIG_SPI_OWNBUS
|
||||
static inline void ads7843e_select(FAR struct spi_dev_s *spi);
|
||||
static inline void ads7843e_deselect(FAR struct spi_dev_s *spi);
|
||||
#else
|
||||
static void ads7843e_select(FAR struct spi_dev_s *spi);
|
||||
static void ads7843e_deselect(FAR struct spi_dev_s *spi);
|
||||
#endif
|
||||
|
||||
/* Interrupts and data sampling */
|
||||
|
||||
static void ads7843e_notify(FAR struct ads7843e_dev_s *priv);
|
||||
static int ads7843e_sample(FAR struct ads7843e_dev_s *priv,
|
||||
@ -200,6 +213,133 @@ static struct ads7843e_dev_s *g_ads7843elist;
|
||||
* Private Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Function: ads7843e_configspi
|
||||
*
|
||||
* Description:
|
||||
* Configure the SPI for use with the ADS7843E. This funcution should be
|
||||
* called once during touchscreen initialization to configure the SPI
|
||||
* bus. Note that if CONFIG_SPI_OWNBUS is not defined, then this function
|
||||
* does nothing.
|
||||
*
|
||||
* Parameters:
|
||||
* spi - Reference to the SPI driver structure
|
||||
*
|
||||
* Returned Value:
|
||||
* None
|
||||
*
|
||||
* Assumptions:
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static inline void ads7843e_configspi(FAR struct spi_dev_s *spi)
|
||||
{
|
||||
#ifdef CONFIG_ADS7843E_FREQUENCY
|
||||
idbg("Mode: %d Bits: 8 Frequency: %d\n",
|
||||
CONFIG_ADS7843E_SPIMODE, CONFIG_ADS7843E_FREQUENCY);
|
||||
#else
|
||||
idbg("Mode: %d Bits: 8\n", CONFIG_ADS7843E_SPIMODE);
|
||||
#endif
|
||||
|
||||
/* Configure SPI for the P14201. But only if we own the SPI bus. Otherwise, don't
|
||||
* bother because it might change.
|
||||
*/
|
||||
|
||||
#ifdef CONFIG_SPI_OWNBUS
|
||||
SPI_SETMODE(spi, CONFIG_ADS7843E_SPIMODE);
|
||||
SPI_SETBITS(spi, 8);
|
||||
#ifdef CONFIG_ADS7843E_FREQUENCY
|
||||
SPI_SETFREQUENCY(spi, CONFIG_ADS7843E_FREQUENCY)
|
||||
#endif
|
||||
#endif
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Function: ads7843e_select
|
||||
*
|
||||
* Description:
|
||||
* Select the SPI, locking and re-configuring if necessary. This function
|
||||
* must be called before initiating any sequence of SPI operations. If we
|
||||
* are sharing the SPI bus with other devices (CONFIG_SPI_OWNBUS undefined)
|
||||
* then we need to lock and configure the SPI bus for each transfer.
|
||||
*
|
||||
* Parameters:
|
||||
* spi - Reference to the SPI driver structure
|
||||
*
|
||||
* Returned Value:
|
||||
* None
|
||||
*
|
||||
* Assumptions:
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef CONFIG_SPI_OWNBUS
|
||||
static inline void ads7843e_select(FAR struct spi_dev_s *spi)
|
||||
{
|
||||
/* We own the SPI bus, so just select the chip */
|
||||
|
||||
SPI_SELECT(spi, SPIDEV_DISPLAY, true);
|
||||
}
|
||||
#else
|
||||
static void ads7843e_select(FAR struct spi_dev_s *spi)
|
||||
{
|
||||
/* Select P14201 chip (locking the SPI bus in case there are multiple
|
||||
* devices competing for the SPI bus
|
||||
*/
|
||||
|
||||
SPI_LOCK(spi, true);
|
||||
SPI_SELECT(spi, SPIDEV_DISPLAY, true);
|
||||
|
||||
/* Now make sure that the SPI bus is configured for the P14201 (it
|
||||
* might have gotten configured for a different device while unlocked)
|
||||
*/
|
||||
|
||||
SPI_SETMODE(spi, CONFIG_ADS7843E_SPIMODE);
|
||||
SPI_SETBITS(spi, 8);
|
||||
#ifdef CONFIG_ADS7843E_FREQUENCY
|
||||
SPI_SETFREQUENCY(spi, CONFIG_ADS7843E_FREQUENCY);
|
||||
#endif
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
/****************************************************************************
|
||||
* Function: ads7843e_deselect
|
||||
*
|
||||
* Description:
|
||||
* De-select the SPI, unlocking as necessary. This function must be
|
||||
* after completing asequence of SPI operations. If we are sharing the SPI
|
||||
* bus with other devices (CONFIG_SPI_OWNBUS undefined) then we need to
|
||||
* un-lock the SPI bus for each transfer, possibly losing the current
|
||||
* configuration.
|
||||
*
|
||||
* Parameters:
|
||||
* spi - Reference to the SPI driver structure
|
||||
*
|
||||
* Returned Value:
|
||||
* None
|
||||
*
|
||||
* Assumptions:
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef CONFIG_SPI_OWNBUS
|
||||
static inline void ads7843e_deselect(FAR struct spi_dev_s *spi)
|
||||
{
|
||||
/* We own the SPI bus, so just de-select the chip */
|
||||
|
||||
SPI_SELECT(spi, SPIDEV_DISPLAY, false);
|
||||
}
|
||||
#else
|
||||
static void ads7843e_deselect(FAR struct spi_dev_s *spi)
|
||||
{
|
||||
/* De-select P14201 chip and relinquish the SPI bus. */
|
||||
|
||||
SPI_SELECT(spi, SPIDEV_DISPLAY, false);
|
||||
SPI_LOCK(spi, false);
|
||||
}
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Name: ads7843e_notify
|
||||
****************************************************************************/
|
||||
@ -944,7 +1084,6 @@ int ads7843e_register(FAR struct spi_dev_s *dev,
|
||||
/* Debug-only sanity checks */
|
||||
|
||||
DEBUGASSERT(dev != NULL && config != NULL && minor >= 0 && minor < 100);
|
||||
DEBUGASSERT((config->address & 0xfc) == 0x48);
|
||||
DEBUGASSERT(config->attach != NULL && config->enable != NULL &&
|
||||
config->clear != NULL && config->pendown != NULL);
|
||||
|
||||
@ -988,6 +1127,8 @@ int ads7843e_register(FAR struct spi_dev_s *dev,
|
||||
}
|
||||
|
||||
/* Initialize the touchscreen device */
|
||||
|
||||
ads7843e_configspi(dev);
|
||||
#warning "Missing logic"
|
||||
|
||||
/* Register the device as an input device */
|
||||
|
||||
@ -2,7 +2,8 @@
|
||||
* include/nuttx/input/ads7843e.h
|
||||
*
|
||||
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
|
||||
* Author: Gregory Nutt <gnutt@nuttx.org>
|
||||
* Authors: Gregory Nutt <gnutt@nuttx.org>
|
||||
* Diego Sanchez <dsanchez@nx-engineering.com>
|
||||
*
|
||||
* References:
|
||||
* "Touch Screen Controller, ADS7843," Burr-Brown Products from Texas
|
||||
@ -59,7 +60,11 @@
|
||||
# define CONFIG_ADS7843E_NPOLLWAITERS 2
|
||||
#endif
|
||||
|
||||
/* Check for some required settings. This can save the user a lot of time
|
||||
#ifndef CONFIG_ADS7843E_SPIMODE
|
||||
# define CONFIG_ADS7843E_SPIMODE SPIDEV_MODE0
|
||||
#endif
|
||||
|
||||
/* Check for some required settings. This can save the user a lot of time
|
||||
* in getting the right configuration.
|
||||
*/
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user