mirror of
https://github.com/bytecodealliance/wasm-micro-runtime.git
synced 2025-05-09 05:06:17 +00:00
338 lines
8.5 KiB
C
338 lines
8.5 KiB
C
/**
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* @file XPT2046.c
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "XPT2046.h"
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#include "board_config.h"
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#include "stdio.h"
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#include <string.h>
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#include "spi.h"
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#include "zephyr.h"
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#include "kernel.h"
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#if USE_XPT2046
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#include <stddef.h>
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#define abs(x) ((x) < 0 ? -(x) : (x))
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static void xpt2046_corr(int16_t * x, int16_t * y);
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static void xpt2046_avg(int16_t * x, int16_t * y);
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/**********************
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* STATIC VARIABLES
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**********************/
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int16_t avg_buf_x[XPT2046_AVG];
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int16_t avg_buf_y[XPT2046_AVG];
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uint8_t avg_last;
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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* Initialize the XPT2046
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*/
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struct device *input_dev;
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struct spi_config spi_conf_xpt2046;
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struct spi_cs_control xpt2046_cs_ctrl;
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struct device *xpt2046_pen_gpio_dev;
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static struct gpio_callback gpio_cb;
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lv_indev_data_t touch_point;
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lv_indev_data_t last_touch_point;
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#define TOUCH_READ_THREAD_STACK_SIZE 4096
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static K_THREAD_STACK_DEFINE(touch_read_thread_stack, TOUCH_READ_THREAD_STACK_SIZE);
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static struct k_thread touch_thread_data;
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static struct k_sem sem_touch_read;
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K_MUTEX_DEFINE( spi_display_touch_mutex);
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int cnt = 0;
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int touch_read_times = 0;
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int last_pen_interrupt_time = 0;
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void xpt2046_pen_gpio_callback(struct device *port, struct gpio_callback *cb,
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u32_t pins)
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{
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int i;
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cnt++;
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if ((k_uptime_get_32() - last_pen_interrupt_time) > 500) {
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k_sem_give(&sem_touch_read);
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touch_read_times++;
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last_pen_interrupt_time = k_uptime_get_32();
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}
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}
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void disable_pen_interrupt()
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{
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int ret = 0;
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ret = gpio_pin_disable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
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if (ret != 0) {
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printf("gpio_pin_configure GPIO_DIR_IN failed\n");
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}
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}
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void enable_pen_interrupt()
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{
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int ret = 0;
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ret = gpio_pin_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
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if (ret != 0) {
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printf("gpio_pin_configure failed\n");
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}
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}
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void touch_screen_read_thread()
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{
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int i;
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bool ret = false;
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for (;;) {
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k_sem_take(&sem_touch_read, K_FOREVER);
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memset(&last_touch_point, 0, sizeof(lv_indev_data_t));
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memset(&touch_point, 0, sizeof(lv_indev_data_t));
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memset(avg_buf_x, 0, sizeof(avg_buf_x));
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memset(avg_buf_y, 0, sizeof(avg_buf_y));
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k_mutex_lock(&spi_display_touch_mutex, K_FOREVER);
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disable_pen_interrupt();
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for (i = 0; i < 100; i++) {
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ret = xpt2046_read(&touch_point);
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if (ret) {
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if ((abs(last_touch_point.point.x - touch_point.point.x) < 4)
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&& (abs(last_touch_point.point.y - touch_point.point.y)
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< 4)) {
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break;
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}
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last_touch_point = touch_point;
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}
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}
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enable_pen_interrupt();
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k_mutex_unlock(&spi_display_touch_mutex);
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}
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}
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void xpt2046_init(void)
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{
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int ret;
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input_dev = device_get_binding(XPT2046_SPI_DEVICE_NAME);
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if (input_dev == NULL) {
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printf("device not found. Aborting test.");
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return;
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}
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memset((void *) &touch_point, 0, sizeof(lv_indev_data_t));
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spi_conf_xpt2046.frequency = XPT2046_SPI_MAX_FREQUENCY;
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spi_conf_xpt2046.operation = SPI_OP_MODE_MASTER | SPI_WORD_SET(8);
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spi_conf_xpt2046.slave = 0;
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spi_conf_xpt2046.cs = NULL;
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#ifdef XPT2046_CS_GPIO_CONTROLLER
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xpt2046_cs_ctrl.gpio_dev = device_get_binding(XPT2046_CS_GPIO_CONTROLLER);
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if (xpt2046_cs_ctrl.gpio_dev == NULL) {
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printk("Cannot find %s!\n", XPT2046_CS_GPIO_CONTROLLER);
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return;
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}
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gpio_pin_configure(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN,
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GPIO_DIR_OUT);
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gpio_pin_write(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN, 1);
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xpt2046_cs_ctrl.gpio_pin = XPT2046_CS_GPIO_PIN;
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xpt2046_cs_ctrl.delay = 0;
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spi_conf_xpt2046.cs = &xpt2046_cs_ctrl;
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#endif
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#ifdef XPT2046_PEN_GPIO_CONTROLLER
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xpt2046_pen_gpio_dev = device_get_binding(XPT2046_PEN_GPIO_CONTROLLER);
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if (!xpt2046_pen_gpio_dev) {
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printk("Cannot find %s!\n", XPT2046_PEN_GPIO_CONTROLLER);
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return;
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}
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/* Setup GPIO input */
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ret = gpio_pin_configure(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN,
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(GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE
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| GPIO_INT_ACTIVE_LOW | GPIO_INT_DEBOUNCE)
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);
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if (ret) {
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printk("Error configuring pin %d!\n", XPT2046_PEN_GPIO_PIN);
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}
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gpio_init_callback(&gpio_cb, xpt2046_pen_gpio_callback,
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BIT(XPT2046_PEN_GPIO_PIN));
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ret = gpio_add_callback(xpt2046_pen_gpio_dev, &gpio_cb);
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if (ret) {
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printk("gpio_add_callback error\n");
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}
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ret = gpio_pin_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
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if (ret) {
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printk("gpio_pin_enable_callback error\n");
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}
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#endif
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k_sem_init(&sem_touch_read, 0, 1);
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k_thread_create(&touch_thread_data, touch_read_thread_stack,
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TOUCH_READ_THREAD_STACK_SIZE, touch_screen_read_thread,
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NULL, NULL, NULL, 5,
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0, K_NO_WAIT);
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printf("xpt2046_init ok \n");
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}
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/**
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* Get the current position and state of the touchpad
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* @param data store the read data here
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* @return false: because no ore data to be read
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*/
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bool xpt2046_read(lv_indev_data_t * data)
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{
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static int16_t last_x = 0;
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static int16_t last_y = 0;
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bool valid = true;
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int s32_ret = 0;
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uint8_t buf;
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int16_t x = 0;
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int16_t y = 0;
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char tx1[16] = { 0 };
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char rx1[16] = { 0 };
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struct spi_buf tx_buf = { .buf = &tx1, .len = 3 };
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struct spi_buf_set tx_bufs = { .buffers = &tx_buf, .count = 1 };
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struct spi_buf rx_buf = { .buf = &rx1, .len = 3 };
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struct spi_buf_set rx_bufs = { .buffers = &rx_buf, .count = 1 };
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tx1[0] = CMD_X_READ;
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s32_ret = spi_transceive(input_dev, &spi_conf_xpt2046, &tx_bufs, &rx_bufs);
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if (s32_ret != 0) {
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printf("spi_transceive return failed:%d\n", s32_ret);
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}
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x = rx1[1] << 8;
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x += rx1[2];
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tx1[0] = CMD_Y_READ;
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s32_ret = spi_transceive(input_dev, &spi_conf_xpt2046, &tx_bufs, &rx_bufs);
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if (s32_ret != 0) {
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printf("spi_transceive return failed:%d\n", s32_ret);
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}
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y = rx1[1] << 8;
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y += rx1[2];
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x = x >> 3;
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y = y >> 3;
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xpt2046_corr(&x, &y);
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if (y <= 0 || (x > 320)) {
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valid = false;
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}
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last_x = x;
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last_y = y;
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data->point.x = x;
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data->point.y = y;
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data->state = valid == false ? LV_INDEV_STATE_REL : LV_INDEV_STATE_PR;
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return valid;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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static void xpt2046_corr(int16_t * x, int16_t * y)
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{
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#if XPT2046_XY_SWAP != 0
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int16_t swap_tmp;
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swap_tmp = *x;
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*x = *y;
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*y = swap_tmp;
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#endif
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if ((*x) > XPT2046_X_MIN)
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(*x) -= XPT2046_X_MIN;
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else
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(*x) = 0;
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if ((*y) > XPT2046_Y_MIN)
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(*y) -= XPT2046_Y_MIN;
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else
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(*y) = 0;
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(*x) = (uint32_t)((uint32_t)(*x) * XPT2046_HOR_RES)
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/ (XPT2046_X_MAX - XPT2046_X_MIN);
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(*y) = (uint32_t)((uint32_t)(*y) * XPT2046_VER_RES)
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/ (XPT2046_Y_MAX - XPT2046_Y_MIN);
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#if XPT2046_X_INV != 0
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(*x) = XPT2046_HOR_RES - (*x);
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#endif
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#if XPT2046_Y_INV != 0
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(*y) = XPT2046_VER_RES - (*y);
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#endif
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}
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static void xpt2046_avg(int16_t * x, int16_t * y)
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{
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/*Shift out the oldest data*/
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uint8_t i;
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for (i = XPT2046_AVG - 1; i > 0; i--) {
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avg_buf_x[i] = avg_buf_x[i - 1];
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avg_buf_y[i] = avg_buf_y[i - 1];
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}
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/*Insert the new point*/
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avg_buf_x[0] = *x;
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avg_buf_y[0] = *y;
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if (avg_last < XPT2046_AVG)
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avg_last++;
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/*Sum the x and y coordinates*/
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int32_t x_sum = 0;
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int32_t y_sum = 0;
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for (i = 0; i < avg_last; i++) {
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x_sum += avg_buf_x[i];
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y_sum += avg_buf_y[i];
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}
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/*Normalize the sums*/
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(*x) = (int32_t) x_sum / avg_last;
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(*y) = (int32_t) y_sum / avg_last;
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}
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bool touchscreen_read(lv_indev_data_t * data)
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{
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/*Store the collected data*/
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data->point.x = last_touch_point.point.x;
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data->point.y = last_touch_point.point.y;
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data->state = last_touch_point.state;
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if (last_touch_point.state == LV_INDEV_STATE_PR) {
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last_touch_point.state = LV_INDEV_STATE_REL;
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}
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return false;
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}
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#endif
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