/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2020-11-08 bigmagic first version */ #include #include #include #include "drv_xpt2046.h" //http://www.lcdwiki.com/MHS-3.5inch_RPi_Display #define DBG_TAG "xpt2046" #define DBG_LVL DBG_INFO #include //XPT2046 #define READ_X (0xD0) #define READ_Y (0x90) #define TFT_WIDTH (320) #define TFT_HEIGHT (480) //freq #define TOUCH_SPI_MAX_FREQ (10*1000) #define TP_IRQ_PIN (17) #define TOUCH_DEVICE_NAME ("spi0.1") static struct rt_semaphore touch_ack; static rt_touch_t touch_device = RT_NULL; static rt_thread_t touch_tid = RT_NULL; #define TOUCH_THREAD_STACK_SIZE (1024) #define TOUCH_THREAD_PRIORITY (30) #define TOUCH_THREAD_TIMESLICE (10) rt_uint8_t touch_flag = 0; rt_uint16_t touch_x_val = 0; rt_uint16_t touch_y_val = 0; extern struct rt_semaphore lcd_spi_lock; static void touch_read_x_y(void *dev, rt_uint16_t *x, rt_uint16_t *y) { struct rt_spi_device *touch_dev = (struct rt_spi_device *)dev; struct rt_spi_message msg1,msg2,msg3,msg4; rt_uint16_t readx_val = 0,ready_val = 0; rt_uint8_t readx[2]; rt_uint8_t ready[2]; rt_sem_take(&lcd_spi_lock, RT_WAITING_FOREVER); int read_x_id = READ_X; int read_y_id = READ_Y; msg1.send_buf = &read_x_id; msg1.recv_buf = RT_NULL; msg1.length = 1; msg1.cs_take = 1; msg1.cs_release = 0; msg1.next = &msg2; msg2.send_buf = RT_NULL; msg2.recv_buf = &readx[0]; msg2.length = 2; msg2.cs_take = 0; msg2.cs_release = 0; msg2.next = &msg3; msg3.send_buf = &read_y_id; msg3.recv_buf = RT_NULL; msg3.length = 1; msg3.cs_take = 0; msg3.cs_release = 0; msg3.next = &msg4; msg4.send_buf = RT_NULL; msg4.recv_buf = &ready[0]; msg4.length = 2; msg4.cs_take = 0; msg4.cs_release = 1; msg4.next = RT_NULL; rt_spi_transfer_message(touch_dev, &msg1); readx_val = ((readx[0] << 8) | readx[1]) >> 4; ready_val = ((ready[0] << 8) | ready[1]) >> 4; rt_sem_release(&lcd_spi_lock); *x = readx_val; *y = ready_val; } /* XPT2046:Width:320 High:480 no pressed:(0x800,0xfff) ---ETH----USB----------------------- | (0x800,0x800) (0xfff,0x800) | | | | (0x800,0xFFF) (0xfff,0xfff) | ------------------------------------ */ #define XMIN 0x800 #define YMAX 0xfff void read_tp(void *dev, rt_uint16_t *x, rt_uint16_t *y) { struct rt_spi_device *touch_dev = (struct rt_spi_device *)dev; rt_uint8_t try = 0; uint16_t _y[5] = {0,0,0,0,0}; uint16_t _x[5] = {0,0,0,0,0}; uint16_t x_val = 0; uint16_t y_val = 0; uint16_t cur_x = 0; uint16_t cur_y = 0; int index = 0; while(1) { try = try + 1; touch_read_x_y(touch_dev, x, y); if((*x > XMIN) && (*y < YMAX)) { _x[index] = *x; _y[index] = *y; index = index + 1; } if(index == 5) { break; } if(try > 10) { break; } } x_val = (_x[0] + _x[1] + _x[2] + _x[3]+ _x[4]) / index; y_val = (_y[0] + _y[1] + _y[2] + _y[3]+ _y[4]) / index; cur_x = (x_val - 0x800) * TFT_WIDTH / 0x800; cur_y = (y_val - 0x800) * TFT_HEIGHT / 0x800; if((cur_x < TFT_WIDTH) && (cur_y < TFT_HEIGHT)) { *x = TFT_WIDTH - cur_x; *y = TFT_HEIGHT - cur_y; } else { *x = 0; *y = 0; } } static void touch_thread_entry(void *param) { rt_uint16_t x,y; struct rt_spi_device *touch_dev; touch_dev = (struct rt_spi_device *)rt_device_find(TOUCH_DEVICE_NAME); touch_dev->config.max_hz = TOUCH_SPI_MAX_FREQ; if (!touch_dev) { rt_kprintf("no %s!\n", TOUCH_DEVICE_NAME); } while (1) { rt_sem_take(&touch_ack, RT_WAITING_FOREVER); read_tp(touch_dev, &x, &y); if((x!= 0) && (y !=0)) { touch_x_val = x; touch_y_val = y; touch_flag = 1; } rt_pin_mode(TP_IRQ_PIN, PIN_MODE_INPUT_PULLUP); } } static void touch_readly(void *args) { if(rt_pin_read(TP_IRQ_PIN) == PIN_LOW) { rt_pin_mode(TP_IRQ_PIN, PIN_MODE_OUTPUT); rt_pin_write(TP_IRQ_PIN,PIN_HIGH); rt_sem_release(&touch_ack); } } static rt_ssize_t xpt2046_read_point(struct rt_touch_device *touch, void *buf, rt_size_t read_num) { rt_uint16_t* touchxy = (rt_uint16_t *)buf; if((read_num != 0) && (touch_flag == 1)) { touchxy[0] = touch_x_val; touchxy[1] = touch_y_val; touch_flag = 0; return read_num; } else { return 0; } } static rt_err_t xpt2046_control(struct rt_touch_device *device, int cmd, void *data) { return RT_EOK; } static struct rt_touch_ops touch_ops = { .touch_readpoint = xpt2046_read_point, .touch_control = xpt2046_control, }; static int hw_xpt2046_touch_init(void) { //touch sem rt_sem_init(&touch_ack, "touch_ack", 0, RT_IPC_FLAG_FIFO); touch_tid = rt_thread_create("touch", touch_thread_entry, RT_NULL, TOUCH_THREAD_STACK_SIZE, TOUCH_THREAD_PRIORITY, TOUCH_THREAD_TIMESLICE); if (touch_tid != RT_NULL) rt_thread_startup(touch_tid); rt_pin_mode(TP_IRQ_PIN, PIN_MODE_INPUT_PULLUP); rt_pin_attach_irq(TP_IRQ_PIN, PIN_IRQ_MODE_LOW_LEVEL, touch_readly, RT_NULL); rt_pin_irq_enable(TP_IRQ_PIN, PIN_IRQ_ENABLE); touch_device = (rt_touch_t)rt_calloc(1, sizeof(struct rt_touch_device)); if (touch_device == RT_NULL) return -RT_ERROR; /* register touch device */ touch_device->info.type = RT_TOUCH_TYPE_RESISTANCE; touch_device->info.vendor = RT_TOUCH_VENDOR_UNKNOWN; //rt_memcpy(&touch_device->config, cfg, sizeof(struct rt_touch_config)); touch_device->ops = &touch_ops; rt_hw_touch_register(touch_device, "xpt2046", RT_DEVICE_FLAG_INT_RX, RT_NULL); return 0; } INIT_DEVICE_EXPORT(hw_xpt2046_touch_init);