TI中文支持网程序验证正确，pl455 UART通讯正常，能够根据指令返回正确长度的响应，但采集电压返回数据均为0；
推测原因：
有一条指令错误写入了寄存器1
nSent=WriteReg（0,0×01,0x000300E0,4,FAMWRT_ALL_NR）
寄存器1存放的是版本号，没有说明写寄存器1是什么效果
Star Xu：
I recommend reading through the software design reference document and checking out the example code. Look in sys_main.c and PL455.C. This will be very helpful. The software design reference can be found here:www.ti.com/…/technicaldocuments
and goes through the sys_main.c file almost line by line.To read back a register, you must give it some place to store the data coming in from the UART peripheral. Our example code uses an array of bytes, denoted bFrame.
