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BT816 NOT START ALL THE TIMES- WHITE SCREEN

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SANDU ONICA:
HELLO,
I used in the past FT800 and I had not problem with this.
BT 816 don't start all the times, sometimes it start with white screen, I checked, for example in this situation PWM control working .
I tried with CPU RESET,COLDSTART,ETC.BT 816 ARE BLOCKED.
Where is the problem?

Best regard,

Sandu Onica

BRT Community:
Hello,

Please ensure you follow the recommended start-up in the Programmers guide below (see section 2.4).

https://brtchip.com/wp-content/uploads/Support/Documentation/Programming_Guides/ICs/EVE/BRT_AN_033_BT81X_Series_Programming_Guide.pdf

When you read the REG_ID do you get 0x7C correctly and when you read REG_CPURESET do you get 0?

Best Regards, BRT Community

SANDU ONICA:
HELLO!

When start corectly ,ofcourse  this registers are tested.
It's posible when are blocked ,this registers have another values?
Power regulator start different for BT816.
This regulator run in Power Down state, for FT800  are disabled and can be restart software.
I"m afraid that power regulator it's problem.
I used RIVERDI 3,5 " .

Best regards,

Sandu Onica

SANDU ONICA:
4.9.3.4 POWERDOWN state
In POWERDOWN state, the clock oscillator, the PLL and the system clock applied to the BT815/6 core is disabled. The core engines are powered down while the SPI interface for host commands remains functional. All register contents are lost and reset to default when the chip is next switched on. The internal regulator remains on.

I POSTED FROM   BT81X (815/6) Advanced Embedded Video Engine Datasheet
Version 1.0

Best regards,

SANDU ONICA

BRT Community:
Hello,

It is possible that REG_CPURESET may not be 0 if the chip has not fully initialised.

If you assert and then deassert the PD line before the start-up sequence, it should reset the chip. Any change in the clock (CLK commands) should be done before the active command as these pout the device to sleep and the active (and the following delay of 300ms) must come after the clock commands.

When it fails to start, how far do you get through the recommended start-up process from section 2.4 of the programmers guide. did the REG_ID read 7C and the REG_CPURESET read 0?

Also, do you have all the new definitions for the registers of the BT816?

Best Regards,
BRT Community

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