381 lines
11 KiB
C
381 lines
11 KiB
C
/****************************************************************************
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* boards/arm/sam34/arduino-due/src/sam_touchscreen.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <stdbool.h>
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#include <stdio.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/board.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/spi/spi_bitbang.h>
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#include <nuttx/input/touchscreen.h>
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#include <nuttx/input/ads7843e.h>
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#include "arm_arch.h"
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#include "sam_gpio.h"
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#include "hardware/sam3u_pio.h"
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#include "arduino-due.h"
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/* Include the bit-band skeleton logic */
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#include <nuttx/spi/spi_bitbang.c>
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/* In order to use the SD card on the ITEAD shield, you must enable the SPI
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* bit-bang driver as well as support for SPI-based ADS7843E/XPT2046
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* touchscreen controller.
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*/
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#if defined(CONFIG_ARDUINO_ITHEAD_TFT) && defined(CONFIG_SPI_BITBANG) && \
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defined(CONFIG_INPUT_ADS7843E)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifndef CONFIG_SAM34_GPIOC_IRQ
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# error "Touchscreen support requires CONFIG_SAM34_GPIOC_IRQ"
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#endif
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#ifndef CONFIG_ADS7843E_FREQUENCY
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# define CONFIG_ADS7843E_FREQUENCY 500000
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#endif
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#ifndef CONFIG_ADS7843E_SPIDEV
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# define CONFIG_ADS7843E_SPIDEV 0
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#endif
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#ifndef CONFIG_ADS7843E_DEVMINOR
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# define CONFIG_ADS7843E_DEVMINOR 0
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#endif
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/* Definitions for include/nuttx/spi/spi_bitbang.c. */
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#define SPI_SETSCK putreg32(1 << 24, SAM_PIOA_SODR)
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#define SPI_CLRSCK putreg32(1 << 24, SAM_PIOA_CODR)
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#define SPI_SETMOSI putreg32(1 << 16, SAM_PIOA_SODR)
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#define SPI_CLRMOSI putreg32(1 << 16, SAM_PIOA_CODR)
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#define SPI_GETMISO ((getreg32(SAM_PIOC_PDSR) >> 22) & 1)
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/* Only mode 0 */
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#undef SPI_BITBANG_DISABLEMODE0
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#define SPI_BITBANG_DISABLEMODE1 1
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#define SPI_BITBANG_DISABLEMODE2 1
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#define SPI_BITBANG_DISABLEMODE3 1
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/* Only 8-bit data width */
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#undef SPI_BITBANG_VARWIDTH
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/* Calibration value for timing loop */
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#define SPI_BITBANG_LOOPSPERMSEC CONFIG_BOARD_LOOPSPERMSEC
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/* SPI_PERBIT_NSEC is the minimum time to transfer one bit. This determines
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* the maximum frequency and is also used to calculate delays to achieve
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* other SPI frequencies.
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*/
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#define SPI_PERBIT_NSEC 100
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Lower-half SPI */
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static void spi_select(FAR struct spi_bitbang_s *priv, uint32_t devid,
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bool selected);
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static uint8_t spi_status(FAR struct spi_bitbang_s *priv, uint32_t devid);
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#ifdef CONFIG_SPI_CMDDATA
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static int spi_cmddata(FAR struct spi_bitbang_s *priv, uint32_t devid,
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bool cmd);
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#endif
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the XPT2046 driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the XPT2046 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*/
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static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr);
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static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable);
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static void tsc_clear(FAR struct ads7843e_config_s *state);
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static bool tsc_busy(FAR struct ads7843e_config_s *state);
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static bool tsc_pendown(FAR struct ads7843e_config_s *state);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the XPT2046
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* driver. This structure provides information about the configuration
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* of the XPT2046 and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active. The
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* memory must be writable because, under certain circumstances, the driver
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* may modify frequency or X plate resistance values.
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*/
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static struct ads7843e_config_s g_tscinfo =
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{
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.frequency = CONFIG_ADS7843E_FREQUENCY,
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.attach = tsc_attach,
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.enable = tsc_enable,
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.clear = tsc_clear,
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.busy = tsc_busy,
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.pendown = tsc_pendown,
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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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* Name: spi_select
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*
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* Description:
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* Select or de-selected the SPI device specified by 'devid'
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*
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* Input Parameters:
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* priv - An instance of the bit-bang driver structure
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* devid - The device to select or de-select
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* selected - True:select false:de-select
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void spi_select(FAR struct spi_bitbang_s *priv, uint32_t devid,
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bool selected)
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{
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/* The touchscreen controller is always selected */
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}
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/****************************************************************************
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* Name: spi_status
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*
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* Description:
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* Return status of the SPI device specified by 'devid'
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*
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* Input Parameters:
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* priv - An instance of the bit-bang driver structure
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* devid - The device to select or de-select
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*
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* Returned Value:
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* An 8-bit, bit-encoded status byte
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*
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****************************************************************************/
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static uint8_t spi_status(FAR struct spi_bitbang_s *priv, uint32_t devid)
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{
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return 0;
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}
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/****************************************************************************
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* Name: spi_cmddata
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*
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* Description:
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* If there were was a CMD/DATA line, this function would manage it
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*
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* Input Parameters:
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* priv - An instance of the bit-bang driver structure
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* devid - The device to use
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* cmd - True=MCD false=DATA
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*
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* Returned Value:
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* OK
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*
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****************************************************************************/
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#ifdef CONFIG_SPI_CMDDATA
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static int spi_cmddata(FAR struct spi_bitbang_s *priv, uint32_t devid,
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bool cmd)
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{
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return OK;
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}
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#endif
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/****************************************************************************
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* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the XPT2046 driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the XPT2046 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*
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****************************************************************************/
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static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr)
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{
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/* Attach the XPT2046 interrupt */
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iinfo("Attaching %p to IRQ %d\n", isr, SAM_TSC_IRQ);
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return irq_attach(SAM_TSC_IRQ, isr, NULL);
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}
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static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable)
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{
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/* Attach and enable, or detach and disable */
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iinfo("IRQ:%d enable:%d\n", SAM_TSC_IRQ, enable);
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if (enable)
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{
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sam_gpioirqenable(SAM_TSC_IRQ);
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}
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else
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{
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sam_gpioirqdisable(SAM_TSC_IRQ);
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}
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}
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static void tsc_clear(FAR struct ads7843e_config_s *state)
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{
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/* Does nothing */
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}
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static bool tsc_busy(FAR struct ads7843e_config_s *state)
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{
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return false; /* The BUSY signal is not connected */
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}
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static bool tsc_pendown(FAR struct ads7843e_config_s *state)
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{
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/* The /PENIRQ value is active low */
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bool pendown = !sam_gpioread(GPIO_TSC_IRQ);
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iinfo("pendown:%d\n", pendown);
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return pendown;
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}
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/****************************************************************************
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* Name: sam_tsc_spiinitialize
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*
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* Description:
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* Initialize the SPI bit-bang driver
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* A non-NULL reference to the SPI driver on success
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*
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****************************************************************************/
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static FAR struct spi_dev_s *sam_tsc_spiinitialize(void)
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{
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/* Configure the SPI bit-bang pins */
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sam_configgpio(GPIO_TSC_SCK);
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sam_configgpio(GPIO_TSC_MISO);
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sam_configgpio(GPIO_TSC_MOSI);
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/* Create the SPI driver instance */
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return spi_create_bitbang(&g_spiops);
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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: sam_tsc_setup
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*
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* Description:
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* This function is called by board-bringup logic to configure the
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* touchscreen device. This function will register the driver as
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* /dev/inputN where N is the minor device number.
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*
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* Input Parameters:
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* minor - The input device minor 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 sam_tsc_setup(int minor)
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{
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FAR struct spi_dev_s *dev;
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int ret;
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iinfo("minor %d\n", minor);
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DEBUGASSERT(minor == 0);
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/* Configure and enable the XPT2046 interrupt pin as an input */
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sam_configgpio(GPIO_TSC_IRQ);
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/* Configure the PIO interrupt */
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sam_gpioirq(SAM_TSC_IRQ);
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/* Get an instance of the SPI interface for the touchscreen chip select */
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dev = sam_tsc_spiinitialize();
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if (!dev)
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{
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ierr("ERROR: Failed to initialize bit bang SPI\n");
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return -ENODEV;
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}
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/* Initialize and register the SPI touschscreen device */
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ret = ads7843e_register(dev, &g_tscinfo, CONFIG_ADS7843E_DEVMINOR);
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if (ret < 0)
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{
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ierr("ERROR: Failed to register touchscreen device\n");
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/* up_spiuninitialize(dev); */
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return -ENODEV;
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}
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return OK;
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}
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#endif /* CONFIG_ARDUINO_ITHEAD_TFT && CONFIG_SPI_BITBANG && CONFIG_INPUT_ADS7843E */
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