进入948内部测试模式，显示屏无画面
用MCUT通过I2C配置948，生成不了测试画面。
步骤参照的是snla132c.pdf的4.3章的例子，寄存器的设定值和屏参如下，麻烦确认一下。
static LVDS948 TBL_Lvds948[] =
{
// subaddr data
//RW PGRS Pattern Generator
{ 0x66, 0x00 },
{ 0x67, 0x7f },
{ 0x66, 0x01 },
{ 0x67, 0x7f },
{ 0x66, 0x02 },
{ 0x67, 0x7f },
//Internal Timing Control Registers
{ 0x66, 0x03 },
{ 0x67, 0x04 },
//Indirect Register Map
{ 0x66, 0x04 },
{ 0x67, 0xEA },
{ 0x66, 0x05 },
{ 0x67, 0xD3 },
{ 0x66, 0x06 },
{ 0x67, 0x2D },
{ 0x66, 0x07 },
{ 0x67, 0xC0 },
{ 0x66, 0x08 },
{ 0x67, 0x03 },
{ 0x66, 0x09 },
{ 0x67, 0x2D },
{ 0x66, 0x0A },
{ 0x67, 0x0C },
{ 0x66, 0x0B },
{ 0x67, 0x03 },
{ 0x66, 0x0C },
{ 0x67, 0x10 },
{ 0x66, 0x0D },
{ 0x67, 0x05 },
//Enable Pattern Generation
{ 0x65, 0x03 },
{ 0x64, 0x11 },
};
