Author Topic: CMD_MEDIAFIFO in FT81x  (Read 3355 times)

Rudolph

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CMD_MEDIAFIFO in FT81x
« on: February 17, 2017, 10:52:06 PM »
Okay, first off I apology because this is not really a Cleo topic.
But I am a bit desperate right now since the only other way I could ask for help would be to contact
FTDIs support and so far I had no success at all with that.

Whatever, I really like the FT8xx and started my own library which you may already have found by chance.
https://www.mikrocontroller.net/topic/395608#new

So, I am directly using FT81x and not Cleo but this forum may be my only chance to get a few answers.


A few days ago I tried to finally make use of CMD_MEDIAFIFO() (chapter 5.20 in FT81x Series Programmers Guide) in order to be able to load images larger than the 4k command-fifo with CMD_LOADIMAGE().
Only, it is not working at all.
In the example in chapter 5.20 REG_MEDIAFIFO_READ and REG_MEDIAFIFO_WRITE are read after CMD_MEDIAFIFO() and supposedly the printf results in "000f000 00f000".
Not only is this result missing one digit with the "f" so conveniantly placed in the middle that there is no way to tell on which end.
All I get when reading the registers after CMD_MEDIAFIFO() is zero.
And when I write to REG_MEDIAFIFO_READ and REG_MEDIAFIFO_WRITE before calling CMD_MEDIAFIFO() these registers get resetted to zero.

CMD_LOADIMAGE() always hangs when I use OPT_MEDIAFIFO.
I must have tried close to everything so far, including manually writing to REG_MEDIAFIFO_READ and writing the raw image-data at address 0x0000.

Can someone please explain to me what is going on there?
What exactly is CMD_MEDIAFIFO() doing?
What are these registers good for?

From the lack of anything else regarding MEDIAFIFO I assumed it is just some memory region you reserve.
REG_MEDIAFIFO_READ as the address from which CMD_LOADIMAGE() with OPT_MEDIAFIFO is supposed to read.

There virtuallly is nothing in the manuals that would explain why it is called a FIFO.

Right now I have a FT810 based TFT from Haoyu with me, I also made tests with a RVT70UQFNWC00 from Riverdi which has a FT813.
As host-controller I am currently using AVR 90CAN64 and 90CAN128.

CleOSupport

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Re: CMD_MEDIAFIFO in FT81x
« Reply #1 on: February 20, 2017, 02:36:37 PM »
Hello Rudolph,

Sorry that you have not been successful contacting our support team. Please resend your question to support1@ftdichip.com so that I can have a member of the team contact you directly?

regards

CleOSupport

Rudolph

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Re: CMD_MEDIAFIFO in FT81x
« Reply #2 on: February 20, 2017, 08:34:25 PM »
I just sent a mail with topic "FT81x and CMD_MEDIAFIFO?" from my private address.
And yes, English is not my native language. :-)

The earlier attempts to contact FTDI were from my company address.

CleOSupport

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Re: CMD_MEDIAFIFO in FT81x
« Reply #3 on: February 21, 2017, 08:59:11 AM »
Hi Rudolph,

Thanks, we have received your email and the enquiry has been allocated to an Support Engineer.

best regards

CleOSupport

MichaelHard

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Re: CMD_MEDIAFIFO in FT81x
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