/************************************************************************************ * configs/shenzhou/src/up_touchscreen.c * arch/arm/src/board/up_touchscreen.c * * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include #include "stm32_internal.h" #include "shenzhou-internal.h" /**************************************************************************** * Pre-Processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ #ifdef CONFIG_INPUT_ADS7843E #ifndef CONFIG_INPUT # error "Touchscreen support requires CONFIG_INPUT" #endif #ifndef CONFIG_STM32_SPI3 # error "Touchscreen support requires CONFIG_STM32_SPI3" #endif #ifndef CONFIG_ADS7843E_FREQUENCY # define CONFIG_ADS7843E_FREQUENCY 500000 #endif #ifndef CONFIG_ADS7843E_SPIDEV # define CONFIG_ADS7843E_SPIDEV 3 #endif #if CONFIG_ADS7843E_SPIDEV != 3 # error "CONFIG_ADS7843E_SPIDEV must be three" #endif #ifndef CONFIG_ADS7843E_DEVMINOR # define CONFIG_ADS7843E_DEVMINOR 0 #endif /**************************************************************************** * Private Types ****************************************************************************/ struct stm32_config_s { struct ads7843e_config_s dev; xcpt_t handler; }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* 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 stm32_config_s g_tscinfo = { { .frequency = CONFIG_ADS7843E_FREQUENCY, .attach = tsc_attach, .enable = tsc_enable, .clear = tsc_clear, .busy = tsc_busy, .pendown = tsc_pendown, }, .handler = NULL, }; /**************************************************************************** * Private Functions ****************************************************************************/ /* 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 handler) { FAR struct stm32_config_s *priv = (FAR struct stm32_config_s *)state; /* Just save the handler for use when the interrupt is enabled */ priv->handler = handler; return OK; } static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable) { FAR struct stm32_config_s *priv = (FAR struct stm32_config_s *)state; /* The caller should not attempt to enable interrupts if the handler * has not yet been 'attached' */ DEBUGASSERT(priv->handler || !enable); /* Attach and enable, or detach and disable */ ivdbg("enable:%d\n", enable); if (enable) { (void)stm32_gpiosetevent(GPIO_TP_INT, true, true, false, priv->handler); } else { (void)stm32_gpiosetevent(GPIO_TP_INT, false, false, false, NULL); } } static void tsc_clear(FAR struct ads7843e_config_s *state) { /* Does nothing */ } static bool tsc_busy(FAR struct ads7843e_config_s *state) { /* Hmmm... The ADS7843E BUSY pin is not brought out on the Shenzhou board. * We will most certainly have to revisit this. There is this cryptic * statement in the XPT2046 spec: "No DCLK delay required with dedicated * serial port." * * The busy state is used by the ADS7843E driver to control the delay * between sending the command, then reading the returned data. */ return false; } static bool tsc_pendown(FAR struct ads7843e_config_s *state) { /* XPT2046 uses an an internal pullup resistor. The PENIRQ output goes low * due to the current path through the touch screen to ground, which * initiates an interrupt to the processor via TP_INT. */ bool pendown = !stm32_gpioread(GPIO_TP_INT); ivdbg("pendown:%d\n", pendown); return pendown; } /**************************************************************************** * 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)stm32_configgpio(GPIO_TP_INT); /* Get an instance of the SPI interface */ dev = up_spiinitialize(CONFIG_ADS7843E_SPIDEV); if (!dev) { idbg("Failed to initialize SPI bus %d\n", CONFIG_ADS7843E_SPIDEV); return -ENODEV; } /* Initialize and register the SPI touschscreen device */ ret = ads7843e_register(dev, &g_tscinfo.dev, CONFIG_ADS7843E_DEVMINOR); if (ret < 0) { idbg("Failed to initialize SPI bus %d\n", CONFIG_ADS7843E_SPIDEV); /* 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_INPUT_ADS7843E */