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Messages - jaypdx

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1
Discussion - Hardware / Re: Fastest I2C transfer rate on FT2232HQ?
« on: February 13, 2024, 03:32:43 PM »
Yes I've done this and it is a little faster than set_latency_timer(2).  But doesn't this device support high-speed USB (480Mbits/s)?  Or does it only run at full-speed (12Mbps) for I2C transfers?

2
Discussion - Hardware / Fastest I2C transfer rate on FT2232HQ?
« on: February 13, 2024, 01:59:21 AM »
We're using an FT2232HQ to interface with an I2C peripheral.  We're basically writing two bytes and then reading back four bytes over and over.  We're seeing a delay of between 1-2ms between each transfer (this is once we change the latency timer to 2).  Is there any way to reduce this dead time?  Is it limited by the USB 'polling interval'?  I understand the polling interval is 1ms for full-speed and 125us for high-speed USB.  Does the FT2232HQ support high-speed USB operation for I2C?

3
Discussion - Software / Re: FT260 - how to read serial number?
« on: January 14, 2022, 09:09:58 PM »
I haven't received a resolution via email yet, but I'm thinking I can open each attached FT260 and read the configuration EEPROM via the FT260_I2CMaster_* commands.  I should be able to figure out where the serial number is stored by comparison with FT_PROG.  This only works because I have an external EEPROM on my board... I'm not sure how one would read the serial number stored inside the chip.  Is this a reasonable approach?  How does FTDI recommend differentiating between multiple FT260's connected to a system?

4
Discussion - Software / Re: FT260 - how to read serial number?
« on: January 13, 2022, 06:46:44 AM »
Do the D2XX functions work for HID devices like the FT260?  When I call FT_ListDevices(&numDev, NULL, FT_LIST_NUMBER_ONLY), it returns numDev=0 with my FT260 EVM attached (though FT_PROG can see it just fine).

5
Discussion - Software / Re: FT260 - how to read serial number?
« on: January 11, 2022, 05:06:26 PM »
How can I read the SN from my application?

6
Discussion - Software / FT260 - how to read serial number?
« on: January 10, 2022, 03:04:58 PM »
I have multiple FT260's attached to my PC and I'd like to use the serial number to tell them apart.  How can I read the serial number of each?  I don't see a function in libft260 that does this.  If this isn't possible, is there some other way to uniquely identify each FT260 attached to the system?




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