RM69032在MTK6739平台调试案例
0赞屏的型号为H163QLN01.1
1，先简单介绍屏的接口定义，此屏接口定义有ELVDD&ELVSS，可以看出不带升压IC，ELVDD跟ELVSS分别是正负电压，type value分别为+4.63，-3.45这个需要主板提供给屏，工作原理是当主板下完初始化后，下了亮度指令后(大多数IC是51h，此处是CFh的P1)，第10脚SWIRE会输出高电平给到升压IC(TPS65631)的使能脚(CTRL)，方可实现升压。
VDD是Analog Power supply type value=3.0V
IOVDD是Digital Power supply type value=1.8V
TE是同步信号，mipi cmd mode才到，video mode用不上，至于为什么，了解一下驱动IC的GRAM
MTP是烧OTP用的，方案公司用不上
其它就是mipi差分信号不作介绍，总体来讲接口定义比较简单
图1 接口定义
图2 EVLDSS&ELVSS升压电路
现在讲一个真实的案例，平台是MTK6739，遇到两个问题
问题1：睡眠唤醒后，画面有一半是雪花点，初步怀疑是读了窗口地址，拿逻辑分析仪抓主板唤醒的代码。
图3 画面异常现象
图4 开机代码
图5 睡眠唤醒代码
从逻辑分析仪抓到的数据可以得知，有写2A,2B，虽然屏的分辨率是320*320，但写0X13F未必会正常，因为驱动IC的默认设置可能不是0x13F，何况规格书中没有写这两个寄存器，最好不要乱写，没必要给自己挖坑，屏蔽2A,2B指令后，屏显示正常。
OK视频
问题2：
进入睡眠后VDD与IOVCC不断电，ELVDD与ELVSS只能通过SWIRE控制开断，下睡眠指令后ELVDD与ELVSS关闭，但唤醒时会遇到闪一条白线，而且是概率性的出现，睡眠时间越长越容易出现，有点类似于TFT中的背光开早了一样，我用测试架模拟可以实现唤醒不闪，具体方法如下：
以下是测试架的代码，转接IC是SSD2828，送视频数据后再打开亮度与显示寄存器，有疑问可以联系我
TG_OpenVideo();
MIPI_SetMode(VD);//进入mipi HS MODE
//高速下指令
MIPI_GenericLongWrite(6);
MIPI_WriteData(0xF0);
MIPI_WriteData(0x55);
MIPI_WriteData(0xAA);
MIPI_WriteData(0x52);
MIPI_WriteData(0x08);
MIPI_WriteData(0x01);//page1
MIPI_GenericLongWrite(8);
MIPI_WriteData(0xCF);//p1写0xCF 打开亮度
MIPI_WriteData(0xFf);
MIPI_WriteData(0xD4);
MIPI_WriteData(0x95);
MIPI_WriteData(0xE8);
MIPI_WriteData(0x4F);
MIPI_WriteData(0x00);
MIPI_WriteData(0x04);
MIPI_GenericLongWrite(6);
MIPI_WriteData(0xF0);
MIPI_WriteData(0x55);
MIPI_WriteData(0xAA);
MIPI_WriteData(0x52);
MIPI_WriteData(0x08);
MIPI_WriteData(0x00);//page0
MIPI_DcsShortWrite(1);
MIPI_WriteData(0x29); // Display on
Delayms(20);
以下是MTK39平台的代码节选
static struct LCM_setting_table lcm_initialization_setting[] =
{
{0xF0,5,{0x55,0xAA,0x52,0x08,0x00}},
{0xBD,5,{0x03,0x20,0x14,0x4B,0x00}},
{0xBE,5,{0x03,0x20,0x14,0x4B,0x01}},
{0xBF,5,{0x03,0x20,0x14,0x4B,0x00}},
{0xBB,3,{0x07,0x07,0x07}},
{0xC7,1,{0x40}},
{0xF0,5,{0x55,0xAA,0x52,0x08,0x02}},
{0xEB,1,{0x02}},
{0xFE,2,{0x08,0x50}},
{0xC3,3,{0xF2,0x95,0x04}},
{0xE9,3,{0x00,0x36,0x38}},
{0xCA,1,{0x04}},
{0xF0,5,{0x55,0xAA,0x52,0x08,0x01}},
{0xB0,3,{0x03,0x03,0x03}},
{0xB1,3,{0x05,0x05,0x05}},
{0xB2,3,{0x01,0x01,0x01}},
{0xB4,3,{0x07,0x07,0x07}},
{0xB5,3,{0x03,0x03,0x03}},
{0xB6,3,{0x55,0x55,0x55}},
{0xB7,3,{0x36,0x36,0x36}},
{0xB8,3,{0x23,0x23,0x23}},
{0xB9,3,{0x03,0x03,0x03}},
{0xBA,3,{0x03,0x03,0x03}},
{0xBE,3,{0x32,0x30,0x70}},
{0xCF,7,{0x00,0xD4,0x95,0xE8,0x4F,0x00,0x04}},//when boot,p1=0x00 light off，建议进入高速后再开亮度，否则会闪
{0x35,1,{0x01}},// TE ON
{0x36,1,{0x00}},
{0xC0,1,{0x20}},
{0xC2,6,{0x17,0x17,0x17,0x17,0x17,0x0B}},
{0xF0,5,{0x55,0xAA,0x52,0x08,0x02}},
{0xED,8,{{0x48,0x00,0xFF,0x13,0x08,0x30,0x0C,0x00}},
{0x11, 0, {0x00}},//Sleep out
{REGFLAG_DELAY,300,{0x00}},
{0xF0,5,{0x55,0xAA,0x52,0x08,0x02}},
{0xED,8,{0x48,0x00,0xFE,0x13,0x08,0x30,0x0C,0x00}},
{REGFLAG_DELAY, 20, {0x00}},
{0xED,8,{0x48,0x00,0xE6,0x13,0x08,0x30,0x0C,0x00}},
{REGFLAG_DELAY, 20, {0x00}},
{0xED,8,{0x48,0x00,0xE2,0x13,0x08,0x30,0x0C,0x00}},
{REGFLAG_DELAY, 20, {0x00}},
{0xED,8,{0x48,0x00,0xE0,0x13,0x08,0x30,0x0C,0x00}},
{REGFLAG_DELAY, 20, {0x00}},
{0xED,8,{0x48,0x00,0xE0,0x13,0x08,0x00,0x0C,0x00}},
{REGFLAG_DELAY, 20, {0x00}},
{0x29, 0, {0x00}},//display on
{0xF0,5,{0x55,0xAA,0x52,0x08,0x00}},
{REGFLAG_END_OF_TABLE, 99, {}}
};
static struct LCM_setting_table lcm_deep_sleep_mode_in_setting[] = {
// Display off sequence
{0x28, 0, {0x00}},
{REGFLAG_DELAY,20, {}},
{0xF0,5,{0x55,0xAA,0x52,0x08,0x00}},
{0xc8,7,{0x84,0x12,0x00,0x00,0xA0,0x00,0x0D}},
{0xF0,5,{0x55,0xAA,0x52,0x08,0x01}},
{0xc2,12,{0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F}},
{REGFLAG_DELAY,20, {}},
{0x29, 0, {0x00}},
{REGFLAG_DELAY,20, {}},
{0x28, 0, {0x00}},
{0x10, 0, {0x00}},
{REGFLAG_DELAY, 120, {}},
{REGFLAG_END_OF_TABLE,99, {}}
//power off
};
static void lcm_get_params(LCM_PARAMS *params)
{
memset(params, 0, sizeof(LCM_PARAMS));
params->type = LCM_TYPE_DSI;
params->width = FRAME_WIDTH;
params->height = FRAME_HEIGHT;
params->virtual_width = VIRTUAL_WIDTH;
params->virtual_height = VIRTUAL_HEIGHT;
// enable tearing-free
params->dbi.te_mode = LCM_DBI_TE_MODE_VSYNC_ONLY;//LCM_DBI_TE_MODE_VSYNC_ONLY;
params->dbi.te_edge_polarity = LCM_POLARITY_FALLING;
#if (LCM_DSI_CMD_MODE)
params->dsi.mode = CMD_MODE;
#else
params->dsi.mode = SYNC_PULSE_VDO_MODE;
#endif
// DSI
params->dsi.LANE_NUM = LCM_ONE_LANE;
//The following defined the fomat for data coming from LCD engine.
params->dsi.data_format.color_order = LCM_COLOR_ORDER_RGB;
params->dsi.data_format.trans_seq = LCM_DSI_TRANS_SEQ_MSB_FIRST;
params->dsi.data_format.padding = LCM_DSI_PADDING_ON_LSB;
params->dsi.data_format.format = LCM_DSI_FORMAT_RGB888;
// Video mode setting
params->dsi.packet_size=256;
params->dsi.PS=LCM_PACKED_PS_24BIT_RGB888;
params->dsi.vertical_sync_active = 2; //4;
params->dsi.vertical_backporch = 16; //12;
params->dsi.vertical_frontporch = 8; //20;
params->dsi.vertical_active_line = VIRTUAL_HEIGHT;
params->dsi.horizontal_sync_active = 4; //8;
params->dsi.horizontal_backporch = 30;
params->dsi.horizontal_frontporch = 30; //20;
params->dsi.horizontal_active_pixel = VIRTUAL_WIDTH;
params->dsi.PLL_CLOCK = 93;//fps 60，对应的Mipi速率为186Mbps
}
调试过程中有遇到问题可以联系我
