diff options
Diffstat (limited to 'nuttx/configs/arduino-due/src/sam_touchscreen.c')
| -rw-r--r-- | nuttx/configs/arduino-due/src/sam_touchscreen.c | 434 |
1 files changed, 434 insertions, 0 deletions
diff --git a/nuttx/configs/arduino-due/src/sam_touchscreen.c b/nuttx/configs/arduino-due/src/sam_touchscreen.c new file mode 100644 index 000000000..cad3d3cda --- /dev/null +++ b/nuttx/configs/arduino-due/src/sam_touchscreen.c @@ -0,0 +1,434 @@ +/************************************************************************************ + * configs/sam3u-ek/src/up_touchscreen.c + * + * Copyright (C) 2011-2013 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 <stdbool.h> +#include <stdio.h> +#include <debug.h> +#include <assert.h> +#include <errno.h> + +#include <nuttx/spi/spi.h> +#include <nuttx/spi/spi_bitbang.h> +#include <nuttx/input/touchscreen.h> +#include <nuttx/input/ads7843e.h> + +#include "up_arch.h" +#include "sam_gpio.h" +#include "chip/sam3u_pio.h" + +#include "arduino-due.h" + +/* In order to use the SD card on the ITEAD shield, you must enable the SPI + * bit-bang driver as well as support for SPI-based ADS7843E/XPT2046 + * touchscreen controller. + */ + +#if defined(CONFIG_ARDUINO_ITHEAD_TFT) && defined(CONFIG_SPI_BITBANG) && \ + defined(CONFIG_INPUT_ADS7843E) + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ +/* Configuration ************************************************************/ + +#ifndef CONFIG_GPIOC_IRQ +# error "Touchscreen support requires CONFIG_GPIOC_IRQ" +#endif + +#ifndef CONFIG_ADS7843E_FREQUENCY +# define CONFIG_ADS7843E_FREQUENCY 500000 +#endif + +#ifndef CONFIG_ADS7843E_SPIDEV +# define CONFIG_ADS7843E_SPIDEV 0 +#endif + +#ifndef CONFIG_ADS7843E_DEVMINOR +# define CONFIG_ADS7843E_DEVMINOR 0 +#endif + +/* Definitions for include/nuttx/spi/spi_bitbang.c. */ + +#define SPI_SETSCK putreg32(1 << 24, SAM_PIOA_SODR) +#define SPI_CLRSCK putreg32(1 << 24, SAM_PIOA_CODR) +#define SPI_SETMOSI putreg32(1 << 16, SAM_PIOA_SODR) +#define SPI_CLRMOSI putreg32(1 << 16, SAM_PIOA_CODR) +#define SPI_GETMISO ((getreg32(SAM_PIOC_PDSR) >> 21) & 1) +#define SPI_SETCS putreg32(1 << ?, SAM_PIO?_SODR) +#define SPI_CLRCS putreg32(1 << ?, SAM_PIO?_CODR) + +/* Only mode 0 */ + +#undef SPI_BITBANG_DISABLEMODE0 +#define SPI_BITBANG_DISABLEMODE1 1 +#define SPI_BITBANG_DISABLEMODE2 1 +#define SPI_BITBANG_DISABLEMODE3 1 + +/* Only 8-bit data width */ + +#undef SPI_BITBANG_VARWIDTH + +/* Calibration value for timing loop */ + +#define SPI_BITBAND_LOOPSPERMSEC CONFIG_BOARD_LOOPSPERMSEC + +/* SPI_PERBIT_NSEC is the minimum time to transfer one bit. This determines + * the maximum frequency and is also used to calculate delays to achieve + * other SPI frequencies. + */ + +#define SPI_PERBIT_NSEC 100 + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ +/* Lower-half SPI */ + +static void spi_select(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid, + bool selected); +static uint8_t spi_status(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid); +#ifdef CONFIG_SPI_CMDDATA +static int spi_cmddata(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid, + bool cmd); +#endif + +/* IRQ/GPIO access callbacks. These operations all hidden behind + * callbacks to isolate the ADS7843E driver from differences in GPIO + * interrupt handling by varying boards and MCUs. If possible, + * interrupts should be configured on both rising and falling edges + * so that contact and loss-of-contact events can be detected. + * + * attach - Attach the ADS7843E interrupt handler to the GPIO interrupt + * enable - Enable or disable the GPIO interrupt + * clear - Acknowledge/clear any pending GPIO interrupt + * pendown - Return the state of the pen down GPIO input + */ + +static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr); +static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable); +static void tsc_clear(FAR struct ads7843e_config_s *state); +static bool tsc_busy(FAR struct ads7843e_config_s *state); +static bool tsc_pendown(FAR struct ads7843e_config_s *state); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/* A reference to a structure of this type must be passed to the ADS7843E + * driver. This structure provides information about the configuration + * of the ADS7843E and provides some board-specific hooks. + * + * Memory for this structure is provided by the caller. It is not copied + * by the driver and is presumed to persist while the driver is active. The + * memory must be writable because, under certain circumstances, the driver + * may modify frequency or X plate resistance values. + */ + +static struct ads7843e_config_s g_tscinfo = +{ + .frequency = CONFIG_ADS7843E_FREQUENCY, + + .attach = tsc_attach, + .enable = tsc_enable, + .clear = tsc_clear, + .busy = tsc_busy, + .pendown = tsc_pendown, +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ +/**************************************************************************** + * Include the bit-band skeleton logic + ****************************************************************************/ + +#include <nuttx/spi/spi_bitbang.c> + +/**************************************************************************** + * Name: spi_select + * + * Description: + * Select or de-selected the SPI device specified by 'devid' + * + * Input Parameters: + * priv - An instance of the bit-bang driver structure + * devid - The device to select or de-select + * selected - True:select false:de-select + * + * Returned Value: + * None + * + ****************************************************************************/ + +static void spi_select(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid, + bool selected) +{ +# warning Still need CS GPIO pin +} + +/**************************************************************************** + * Name: spi_status + * + * Description: + * Return status of the SPI device specified by 'devid' + * + * Input Parameters: + * priv - An instance of the bit-bang driver structure + * devid - The device to select or de-select + * + * Returned Value: + * An 8-bit, bit-encoded status byte + * + ****************************************************************************/ + +static uint8_t spi_status(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid) +{ + return 0; +} + +/**************************************************************************** + * Name: spi_cmddata + * + * Description: + * If there were was a CMD/DATA line, this function would manage it + * + * Input Parameters: + * priv - An instance of the bit-bang driver structure + * devid - The device to use + * cmd - True=MCD false=DATA + * + * Returned Value: + * OK + * + ****************************************************************************/ + +#ifdef CONFIG_SPI_CMDDATA +static int spi_cmddata(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid, + bool cmd) +{ + return OK; +} +#endif + +/**************************************************************************** + * IRQ/GPIO access callbacks. These operations all hidden behind + * callbacks to isolate the ADS7843E driver from differences in GPIO + * interrupt handling by varying boards and MCUs. If possible, + * interrupts should be configured on both rising and falling edges + * so that contact and loss-of-contact events can be detected. + * + * attach - Attach the ADS7843E interrupt handler to the GPIO interrupt + * enable - Enable or disable the GPIO interrupt + * clear - Acknowledge/clear any pending GPIO interrupt + * pendown - Return the state of the pen down GPIO input + * + ****************************************************************************/ + +static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr) +{ + /* Attach the ADS7843E interrupt */ + + ivdbg("Attaching %p to IRQ %d\n", isr, SAM_TCS_IRQ); + return irq_attach(SAM_TCS_IRQ, isr); +} + +static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable) +{ + /* Attach and enable, or detach and disable */ + + ivdbg("IRQ:%d enable:%d\n", SAM_TCS_IRQ, enable); + if (enable) + { + sam_gpioirqenable(SAM_TCS_IRQ); + } + else + { + sam_gpioirqdisable(SAM_TCS_IRQ); + } +} + +static void tsc_clear(FAR struct ads7843e_config_s *state) +{ + /* Does nothing */ +} + +static bool tsc_busy(FAR struct ads7843e_config_s *state) +{ +#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_VERBOSE) + static bool last = (bool)-1; +#endif + + /* BUSY is high impedance when CS is high (not selected). When CS is + * is low, BUSY is active high. + */ + + bool busy = sam_gpioread(GPIO_TCS_BUSY); +#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_VERBOSE) + if (busy != last) + { + ivdbg("busy:%d\n", busy); + last = busy; + } +#endif + + return busy; +} + +static bool tsc_pendown(FAR struct ads7843e_config_s *state) +{ + /* The /PENIRQ value is active low */ + + bool pendown = !sam_gpioread(GPIO_TCS_IRQ); + ivdbg("pendown:%d\n", pendown); + return pendown; +} + +/**************************************************************************** + * Name: sam_tsc_spiinitialize + * + * Description: + * Initialize the SPI bit-bang driver + * + * Input Parameters: + * None + * + * Returned Value: + * A non-NULL reference to the SPI driver on success + * + ****************************************************************************/ + +static FAR struct spi_dev_s *sam_tsc_spiinitialize(void) +{ + /* Configure the SPI bit-bang pins */ + + sam_configgpio(GPIO_TSC_SCK); + sam_configgpio(GPIO_TSC_MISO); + sam_configgpio(GPIO_TSC_MOSI); + sam_configgpio(GPIO_TSC_CS); + + /* Create the SPI driver instance */ + + return spi_create_bitbang(&g_spiops); +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: arch_tcinitialize + * + * Description: + * Each board that supports a touchscreen device must provide this function. + * This function is called by application-specific, setup logic to + * configure the touchscreen device. This function will register the driver + * as /dev/inputN where N is the minor device number. + * + * Input Parameters: + * minor - The input device minor number + * + * Returned Value: + * Zero is returned on success. Otherwise, a negated errno value is + * returned to indicate the nature of the failure. + * + ****************************************************************************/ + +int arch_tcinitialize(int minor) +{ + FAR struct spi_dev_s *dev; + int ret; + + idbg("minor %d\n", minor); + DEBUGASSERT(minor == 0); + + /* Configure and enable the ADS7843E interrupt pin as an input */ + + (void)sam_configgpio(GPIO_TSC_IRQ); + (void)sam_configgpio(GPIO_TCS_IRQ); + + /* Configure the PIO interrupt */ + + sam_gpioirq(SAM_TCS_IRQ); + + /* Get an instance of the SPI interface for the touchscreen chip select */ + + dev = sam_tsc_spiinitialize(); + if (!dev) + { + idbg("Failed to initialize bit bang SPI\n"); + return -ENODEV; + } + + /* Initialize and register the SPI touschscreen device */ + + ret = ads7843e_register(dev, &g_tscinfo, CONFIG_ADS7843E_DEVMINOR); + if (ret < 0) + { + idbg("Failed to register touchscreen device\n"); + /* up_spiuninitialize(dev); */ + return -ENODEV; + } + + return OK; +} + +/**************************************************************************** + * Name: arch_tcuninitialize + * + * Description: + * Each board that supports a touchscreen device must provide this function. + * This function is called by application-specific, setup logic to + * uninitialize the touchscreen device. + * + * Input Parameters: + * None + * + * Returned Value: + * None. + * + ****************************************************************************/ + +void arch_tcuninitialize(void) +{ + /* No support for un-initializing the touchscreen ADS7843E device yet */ +} + +#endif /* CONFIG_ARDUINO_ITHEAD_TFT && CONFIG_SPI_BITBANG && CONFIG_INPUT_ADS7843E */ |