1、实现SPI驱动TSC2046，读取X，Y触摸坐标

2、触摸坐标和LCD坐标的对应关系可由矩阵平移、旋转、缩放三者来表示

XL XT*A+XT*B+C

YL YT*D+YT*E+F

采用五点校正算法，计算出参数A，B，C，D，E，F

因为参数多为小数不易存放，所以乘以一个参数作为整数存放。

3、每次读取触摸按下的坐标时，读TSC2046的是触摸坐标，

而需要的是LCD坐标，所以把触摸坐标和上述参数代入上面等式即可获得-1, to achieve SPI drive TSC2046, read X, Y touch coordinates

2, touch coordinates and LCD coordinates of the corresponding relationship can be matrix translation, rotation, zoom to show that the three

XL　 XT* A+ XT* B+ C

YL　 YT* D+ YT* E+ F

The parameters A, B, C, D, E, F are calculated using the five-point correction algorithm

Because the parameters are mostly decimal not easy to store, so multiplied by a parameter stored as an integer.

3, each time you read the touch press the coordinates, read TSC2046 is the touch coordinates,

And the need for LCD coordinates, so the touch coordinates and the above parameters into the above equation can be obtained