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rt-thread-official/bsp/raspberry-pi/raspi4-32/driver/touch/drv_xpt2046.c

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/*
* 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 <rtthread.h>
#include <rtdevice.h>
#include "drv_xpt2046.h"
//http://www.lcdwiki.com/MHS-3.5inch_RPi_Display
#define DBG_TAG "xpt2046"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
//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);
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