Unable to reset FT812 in Riverdi Display 7"

[claudio_melis]

Hello,
I hope that somebody could be so kind to give me some feedback on this issue.

I am trying to reset the FTDI FT812 used by the display in hte subject in order to be able to program it.
I have previous experience with FTDI FT801 and I am trying to reuse part of the code. At least the initialization part.
My problem is that even if I am following the instruction in the Programming Guide the code that works for the FT800 is not working for the FT812.

I used an oscilloscope in order to sniff the signals and everything looks fine but when I am trying to read register FT800_REG_ID i get 0xff (255) and not 0x7c.

I assume that I am doing something wrong but I am not able to spot it.

Any help would be really appreciated.

Kind regards,
Claudio Melis

[strahinja.jacimovic]

Hi,

What exactly is your code and what Programming Guide did you follow?

Kind regards,

[claudio_melis]

Hello Strahinja,
I have used FT81x Series Programmers Guide available at http://brtchip.com/wp-content/uploads/S ... _Guide.pdf

You can find here attached the file that we use to configure the FT812 it is a reworked version of the original ft800 file.

the .c contains an fsm that is called by our scheduler but I am always stuck in
case FT800_FSM_WAIT_ALIVE:
//check that FT800 is alive
if(FT800RawRead8(FT800_REG_ID) != 0x7c)
return;

FT800FSM.status = FT800_FSM_CONFIGURE;
break;

I don't know if you can help me. But any suggestion would be really appreciated.

MCU is Texas Instruments f28m36.

Regards,
Claudio
register is never equal to 0x7c

[strahinja.jacimovic]

Hi,

According to the code snippet you provided, the code is not supposed to be 0x7C.

In the IF clause, the part "!= 0x7c" means not equal to.

Kind regards,

[claudio_melis]

The problem was in the SPI Mode.
I used mode 2 but correct mode is 0.

You can close this post .

Regards,
Claudio