Hello!
I've used EVE 1 and 2 in projects before. Now I'd like to take advantage of REG_CMDB_WRITE command.
If understood correctly, REG_CMDB_WRITE takes one 32-bit command. Do I have to send a total of 7 bytes (3 byte address + 4 byte data) over SPI per 32 bit display list command?
Or is there a way to send multiple commands at once as a real bulk transfer? Something like: 3 byte address -> 32 bit command -> 32 bit command -> 32 bit command ...
The address overhead seems to high when sending big amounts of data.
Best regards,
Paul
You can send as many bytes as you like after the initial address, the limit is only in where you write to.
So in this case when writing to REG_CMDB_WRITE the limit would be obviously 4k for the size of the FIFO after which at least caution is advised.
Take a peak at my implementation: https://github.com/RudolphRiedel/FT800-FT813
Hello Rudolph,
thank you for the link. Found it in EVE_start_cmd_burst(). Actually, it's not very clear to me reading the manual that it is working that way.
That's making life a lot easier now, because I don't have to keep track of the write position in FIFO buffer anymore.
Best regards,
Paul
Hi Paul,
Yes, you can also use burst writes on other areas of memory too as Rudolph mentioned (e.g. to write image data to RAM_G) which helps to speed this up a lot,
Best Regards, BRT Community