touch_panel
功能概述
启动一个 FreeRTOS 任务，初始化触摸驱动芯片，配置触摸芯片基本参数， 在循环中获取触摸点，通过触摸点获取实际所触摸的坐标，并在串口中显示出来。
如何添加新的 touch panel :
a) Device Table 中 要预先设定 该 touch panel 屏的设备信息.
b) 此应用参考程序 引用 wm_drv_touch_panel.h 中 的宏定义 ‘WM_CFG_TOUCH_PANEL_NAME’， 其值应配置成 Device Table 中已预设的 touch panel 屏设备 的设备名。
并在 menuconfig -> PERIPHERALS -> Touch Panel -> touch panel 中选中 touch panel 设备, 或者在 prj.config 中直接定义所需选中 touch panel 设备的 Compile 开关，如 “CONFIG_COMPONENT_XPT2046_DRIVER=y” 。c) 该 TFT touch panel 屏的设备驱动 需要适配好，主要是其驱动实现的 ops 函数需要实现，并关联到 Device Table 中 dt_hw_table_entry[] 中。
环境要求
触摸驱动芯片：
型号：ft6336 或 xpt2046 通过 menuconfig -> PERIPHERALS -> Touch driver -> touch Device 中选择触摸驱动控制器。
引脚连接： ft6336 和 xpt2046 触摸驱动控制器的硬件配置在wm_dt_hw.c文件中进行（默认使用W802芯片） 这仅是一个范例，用户需要依据自己的开发板及应用需求，选择自己适合的引脚定义，修改device table，然后进行重新编译。
| GPIO序号 | 引脚编号 | 连接描述 | FT6336 PIN |
|---|---|---|---|
| WM_GPIO_NUM_1 | PA1 | I2C_SCL | 44 |
| WM_GPIO_NUM_4 | PA4 | I2C_SDA | 45 |
| WM_GPIO_NUM_24 | PB8 | RESET | 42 |
| GPIO序号 | 引脚编号 | 连接描述 | xpt2046 PIN |
|---|---|---|---|
| WM_GPIO_NUM_24 | PB8 | CLK | 16 |
| WM_GPIO_NUM_25 | PB9 | CS | 15 |
| WM_GPIO_NUM_28 | PB12 | MOSI | 14 |
| WM_GPIO_NUM_29 | PB13 | MISO | 12 |
| WM_GPIO_NUM_30 | PB14 | IRQ | 11 |
编译和烧录
示例位置：examples/peripheral/touch_panel/touch_panel_basic
编译、烧录等操作请参考：快速入门
运行结果
当触摸ft6336触摸屏时，如果只有一个触摸点时，只会打印触摸点1（Touch coordinate point 1）
如果有两个触摸点，则会打印触摸点1（Touch coordinate point 1），触摸点2（Touch coordinate point 2）。
对于电阻触摸屏(如:xpt2046) 执行时也会打印如下log, 只是电阻屏需要做校准后才准确，校准可以参考另外一个例程examples/peripheral/touch_panel/touch_panel_calibration
[I] (352622) test: Touch coordinate point 1, x-coordinate is 302, y-coordinate is 240.
[I] (352623) test: Touch coordinate point 2, x-coordinate is 251, y-coordinate is 341.
[I] (352724) test: Touch coordinate point 1, x-coordinate is 302, y-coordinate is 240.
[I] (352725) test: Touch coordinate point 2, x-coordinate is 251, y-coordinate is 341.
[I] (352826) test: Touch coordinate point 1, x-coordinate is 302, y-coordinate is 240.
[I] (352827) test: Touch coordinate point 2, x-coordinate is 251, y-coordinate is 341.
[I] (352928) test: Touch coordinate point 1, x-coordinate is 302, y-coordinate is 240.
[I] (352929) test: Touch coordinate point 2, x-coordinate is 243, y-coordinate is 342.
[I] (353030) test: Touch coordinate point 1, x-coordinate is 227, y-coordinate is 355.
[I] (353031) test: Touch coordinate point 2, x-coordinate is 300, y-coordinate is 209.
[I] (353132) test: Touch coordinate point 1, x-coordinate is 285, y-coordinate is 131.
[I] (353133) test: Touch coordinate point 2, x-coordinate is 227, y-coordinate is 355.
[I] (353234) test: Touch coordinate point 1, x-coordinate is 300, y-coordinate is 130.
[I] (353336) test: Touch coordinate point 1, x-coordinate is 205, y-coordinate is 313.
[I] (353438) test: Touch coordinate point 1, x-coordinate is 284, y-coordinate is 156.
[I] (366476) test: Touch coordinate point 1, x-coordinate is 127, y-coordinate is 208.
[I] (366578) test: Touch coordinate point 1, x-coordinate is 127, y-coordinate is 208.
[I] (366680) test: Touch coordinate point 1, x-coordinate is 127, y-coordinate is 208.
[I] (367085) test: Touch coordinate point 1, x-coordinate is 219, y-coordinate is 132.
[I] (367086) test: Touch coordinate point 2, x-coordinate is 144, y-coordinate is 256.
[I] (367187) test: Touch coordinate point 1, x-coordinate is 219, y-coordinate is 132.
[I] (367188) test: Touch coordinate point 2, x-coordinate is 144, y-coordinate is 256.
[I] (367289) test: Touch coordinate point 1, x-coordinate is 219, y-coordinate is 132.
[I] (367290) test: Touch coordinate point 2, x-coordinate is 144, y-coordinate is 256.
[I] (367391) test: Touch coordinate point 1, x-coordinate is 219, y-coordinate is 132.
[I] (367392) test: Touch coordinate point 2, x-coordinate is 144, y-coordinate is 256.
[I] (367493) test: Touch coordinate point 1, x-coordinate is 219, y-coordinate is 132.
[I] (367494) test: Touch coordinate point 2, x-coordinate is 144, y-coordinate is 256.
[I] (367999) test: Touch coordinate point 1, x-coordinate is 176, y-coordinate is 246.
[I] (368000) test: Touch coordinate point 2, x-coordinate is 218, y-coordinate is 134.
[I] (368101) test: Touch coordinate point 1, x-coordinate is 218, y-coordinate is 134.
[I] (368102) test: Touch coordinate point 2, x-coordinate is 176, y-coordinate is 246.
[I] (368203) test: Touch coordinate point 1, x-coordinate is 218, y-coordinate is 134.
[I] (368305) test: Touch coordinate point 1, x-coordinate is 148, y-coordinate is 217.