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Topic: NEW White screen information? (Read 1594 times)
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WD8BXS
alter Hase
 Offline
Posts: 288
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NEW White screen information?
« on: 25. December 2020, 13:23:37 »
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Hello Everyone!
I had written the Thaoyu people about the white displays. Here is what they said:
Your driver must use a low-speed clock to be fully compatible with HY28B. Otherwise some can work and some can't work.
The A version is the slowest. The D version is the fastest. So the timing of the operation of your LCD driver must be done in accordance with the A version. In addition, the D version must also use the new initialization code. I will attach a new initialization code later.
This is compatible with all 2.8 LCDs. (The timing mentioned above refers to the address setup time/address hold time of the i8080 bus, and the data setup time/data hold time. Different MCU settings are different. You can modify this part of the timing.)
This is not a problem. do not worry. Your initialization code is the earliest. There's an BUG. Please use the new initialization code updates.
DeviceCode = LCD_ReadReg(0x0000); /* read LCD ID */
/* recognition different screen, use different Initialization */
if( DeviceCode == 0x9325 || DeviceCode == 0x9328 )
{
LCD_Code = ILI9325;
LCD_WriteReg(0xE5, 0x78F0); /* set SRAM internal timing */
LCD_WriteReg(0x01, 0x0100); /* set Driver Output Control */
LCD_WriteReg(0x02, 0x0700); /* set 1 line inversion */
LCD_WriteReg(0x03, 0x1030); /* set GRAM write direction and BGR=1 */
LCD_WriteReg(0x04, 0x0000); /* Resize register */
LCD_WriteReg(0x08, 0x0207); /* set the back porch and front porch */
LCD_WriteReg(0x09, 0x0000); /* set non-display area refresh cycle ISC[3:0] */
LCD_WriteReg(0x0A, 0x0000); /* FMARK function */
LCD_WriteReg(0x0C, 0x0000); /* RGB interface setting */
LCD_WriteReg(0x0D, 0x0000); /* Frame marker Position */
LCD_WriteReg(0x0F, 0x0000); /* RGB interface polarity */
/*************Power On sequence ****************/
LCD_WriteReg(0x10, 0x0000); /* SAP, BT[3:0], AP, DSTB, SLP, STB */
LCD_WriteReg(0x11, 0x0007); /* DC1[2:0], DC0[2:0], VC[2:0] */
LCD_WriteReg(0x12, 0x0000); /* VREG1OUT voltage */
LCD_WriteReg(0x13, 0x0000); /* VDV[4:0] for VCOM amplitude */
LCD_WriteReg(0x07, 0x0001);
delay_ms(200);
/* Dis-charge capacitor power voltage */
LCD_WriteReg(0x10, 0x1090); /* SAP, BT[3:0], AP, DSTB, SLP, STB */
LCD_WriteReg(0x11, 0x0227); /* Set DC1[2:0], DC0[2:0], VC[2:0] */
delay_ms(50); /* Delay 50ms */
LCD_WriteReg(0x12, 0x001F);
delay_ms(50); /* Delay 50ms */
LCD_WriteReg(0x13, 0x1500); /* VDV[4:0] for VCOM amplitude */
LCD_WriteReg(0x29, 0x0027); /* 04 VCM[5:0] for VCOMH */
LCD_WriteReg(0x2B, 0x000D); /* Set Frame Rate */
delay_ms(50); /* Delay 50ms */
LCD_WriteReg(0x20, 0x0000); /* GRAM horizontal Address */
LCD_WriteReg(0x21, 0x0000); /* GRAM Vertical Address */
/* ----------- Adjust the Gamma Curve ---------- */
LCD_WriteReg(0x30, 0x0000);
LCD_WriteReg(0x31, 0x0707);
LCD_WriteReg(0x32, 0x0307);
LCD_WriteReg(0x35, 0x0200);
LCD_WriteReg(0x36, 0x0008);
LCD_WriteReg(0x37, 0x0004);
LCD_WriteReg(0x38, 0x0000);
LCD_WriteReg(0x39, 0x0707);
LCD_WriteReg(0x3C, 0x0002);
LCD_WriteReg(0x3D, 0x1D04);
/* ------------------ Set GRAM area --------------- */
LCD_WriteReg(0x50, 0x0000); /* Horizontal GRAM Start Address */
LCD_WriteReg(0x51, 0x00EF); /* Horizontal GRAM End Address */
LCD_WriteReg(0x52, 0x0000); /* Vertical GRAM Start Address */
LCD_WriteReg(0x53, 0x013F); /* Vertical GRAM Start Address */
LCD_WriteReg(0x60, 0xA700); /* Gate Scan Line */
LCD_WriteReg(0x61, 0x0001); /* NDL,VLE, REV */
LCD_WriteReg(0x6A, 0x0000); /* set scrolling line */
/* -------------- Partial Display Control --------- */
LCD_WriteReg(0x80, 0x0000);
LCD_WriteReg(0x81, 0x0000);
LCD_WriteReg(0x82, 0x0000);
LCD_WriteReg(0x83, 0x0000);
LCD_WriteReg(0x84, 0x0000);
LCD_WriteReg(0x85, 0x0000);
/* -------------- Panel Control ------------------- */
LCD_WriteReg(0x90, 0x0010);
LCD_WriteReg(0x92, 0x0600);
LCD_WriteReg(0x07, 0x0133); /* 262K color and display ON */
}
I have no idea what they are talking about but you fellows who know the code might know .
Possibly this is a fix for the issue.
Merry Christmas,
Chuck Vy 73, WD8BXS
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 Logged
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Thanks,
De WD8BXS vy 73
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WD8BXS
alter Hase
Offline
Posts: 288
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Re:NEW White screen information?
« Reply #2 on: 25. December 2020, 17:11:23 »
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It is SPI, for the MCHF 6.3 Version.
Thanks
Chuck
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Logged
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Thanks,
De WD8BXS vy 73
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WD8BXS
alter Hase
Offline
Posts: 288
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Re:NEW White screen information?
« Reply #4 on: 26. December 2020, 00:47:42 »
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Yes, I am aware of the new larger LCD, but that is not really an option here.
I am just forwarding this information from the manufacturer.
I had a bad display that turns white after an hour or so.
I think it is defective, but they tell me it is me fault for the code error, hihi
What they will go through just so they don't have to replace a display, ihi
Thanks,
Chuck
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Logged
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Thanks,
De WD8BXS vy 73
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