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Topics - Cactus

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Discussion - Software / FT4222H Checksum
« on: February 27, 2018, 04:43:14 pm »
Regarding the checksum. From what I gather, the checksum is the total of all the data bytes in the message. And according to the example SPI_slave_Test_Master_Side, this is created by summing the values of the send buffer, and then casting it as a uint16.
If this is correct, should it be possible to have the final data points as a series of 257* 255 which add up to 65535 thus fooling the checksum?

Discussion - Hardware / FT4222H Slave Losing bytes
« on: February 20, 2018, 09:46:09 am »
Hi I was wondering if anyone would be able to provide me with a reason the FT4222h is losing bytes.
I am currently using the FT4222h in slave mode, with a microprocessor as master.
The microprocessor sends parcels 6630 bytes every 4ms. Using a Labview program, I poll the "SPI Slave Get Rx Status" and read when there are incoming bytes.
Occasionally the FT4222h has missed bytes and the next parcel has "merged" with the previous parcel.
E.g if i am sending a parcel of 0-6629, one parcel may come up 0,1,2,...4560,4561,90,130,1,25,230,0,1,2,3,...
where 90,130,1,25,230, is the protocol for the packet.
This occurs very infrequently, however I am requiring a high fidelity system, so losing bytes is not ideal.
I have set the latency as 4ms and the Transfer size for USB IN request to 6656 bytes. Slave is set as SPI_SLAVE_WITH_PROTOCOL.

New Member Introductions / Hello
« on: January 16, 2018, 10:28:29 am »
Hi all,
I'm a university PHD student hoping to make use of some of FTDI chips for communication with microcontrollers (STM32 series), with the end point of high throughput Data-Loggers. Currently looking at the FTDI 4222h and would eventually like to be familiar with the Super-speed series.
I'm basically still learning in both microcontroller use and electronics so apologies for any glaringly obvious mistakes.

Discussion - Software / Communication with the FT4222 using Matlab
« on: January 16, 2018, 10:22:06 am »
Hi all,
I was wondering if anyone had any experience initializing and using for SPI communications the FT4222 only using the D2XX drivers.
I am looking to use this chip interfacing with Matlab, however I have only been able to successfully load the D2XX libraries, not the FT4222 libraries.

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