Touch

Collaboration diagram for Touch:

Data Structures
struct	rt_touch_info
struct	rt_touch_config
struct	rt_touch_device
struct	rt_touch_data
struct	rt_touch_ops

Functions
int	rt_hw_touch_register (rt_touch_t touch, const char *name, rt_uint32_t flag, void *data)
void	rt_hw_touch_isr (rt_touch_t touch)

Detailed Description

Touch driver api.

Example

#include <rtthread.h>
#include "rtdevice.h"
 
static rt_thread_t  gt9147_thread = RT_NULL;
static rt_sem_t     gt9147_sem = RT_NULL;
static rt_device_t  dev = RT_NULL;
static struct       rt_touch_data *read_data;
 
// 读取数据线程入口函数
static void gt9147_entry(void *parameter)
{
    struct rt_touch_data *read_data;
    read_data = (struct rt_touch_data *)rt_malloc(sizeof(struct rt_touch_data) * 5);
 
    while (1)
    {
        // 请求信号量
        rt_sem_take(gt9147_sem, RT_WAITING_FOREVER);
        // 读取五个点的触摸信息
        if (rt_device_read(dev, 0, read_data, 5) == 5)
        {
            for (rt_uint8_t i = 0; i < 5; i++)
            {
                if (read_data[i].event == RT_TOUCH_EVENT_DOWN || read_data[i].event == RT_TOUCH_EVENT_MOVE)
                {
                    rt_kprintf("%d %d %d %d %d\n",
                                read_data[i].track_id,
                                read_data[i].x_coordinate,
                                read_data[i].y_coordinate,
                                read_data[i].timestamp,
                                read_data[i].width);
                }
            }
        }
        // 打开中断
        rt_device_control(dev, RT_TOUCH_CTRL_ENABLE_INT, RT_NULL);
    }
}
 
// 接收回调函数
static rt_err_t rx_callback(rt_device_t dev, rt_size_t size)
{
    // 关闭中断
    rt_device_control(dev, RT_TOUCH_CTRL_DISABLE_INT, RT_NULL);
    // 释放信号量
    rt_sem_release(gt9147_sem);
    return 0;
}
 
static int gt9147_sample(void)
{
    // 查找 Touch 设备
    dev = rt_device_find("touch");
 
    if (dev == RT_NULL)
    {
        rt_kprintf("can't find device:%s\n", "touch");
        return -1;
    }
    // 以中断的方式打开设备
    if (rt_device_open(dev, RT_DEVICE_FLAG_INT_RX) != RT_EOK)
    {
        rt_kprintf("open device failed!");
        return -1;
    }
    // 设置接收回调
    rt_device_set_rx_indicate(dev, rx_callback);
    // 创建信号量
    gt9147_sem = rt_sem_create("dsem", 0, RT_IPC_FLAG_PRIO);
 
    if (gt9147_sem == RT_NULL)
    {
        rt_kprintf("create dynamic semaphore failed.\n");
        return -1;
    }
    // 创建读取数据线程
    gt9147_thread = rt_thread_create("thread1",
                                     gt9147_entry,
                                     RT_NULL,
                                     THREAD_STACK_SIZE,
                                     THREAD_PRIORITY,
                                     THREAD_TIMESLICE);
    // 启动线程
    if (gt9147_thread != RT_NULL)
        rt_thread_startup(gt9147_thread);
 
    return 0;
}
MSH_CMD_EXPORT(gt9147_sample, gt9147 sample);

Function Documentation

rt_hw_touch_register()

int rt_hw_touch_register	(	rt_touch_t	touch,
		const char *	name,
		rt_uint32_t	flag,
		void *	data
	)

register a touch device

Parameters

touch	the touch device
name	the name of touch device
flag	the flag of touch device
data	the user data of touch device

Returns

rt_err_t error code

rt_hw_touch_isr()

void rt_hw_touch_isr

(

rt_touch_t

touch

)

Touch irq handle.

Parameters

touch

the touch device

Note

If you doesn't use pin device. you must call this function in your touch irq callback