UART->RS232 adapter that supports 1.5M?
(08-08-2020, 04:44 PM)Skirmisher Wrote: I'm looking around for appropriate level-shifting adapters, trying to find one that supports the RP64's default baud rate of 1.5M. Does anyone have such a device to recommend?

I suggest looking up the data sheet for the chip on any adapter you consider buying. The data sheet will say what speeds are supported. (You can usually find it quickly by searching the pdf for "bps" or "baud".) If the product listing doesn't state what chip is used, avoid it.

Do not trust the speed claims in cheap adapter product listings. I bought one that claimed to support 1.5mbps, but that claim was a lie. It has a CP2102 chip, and produces garbage at the RockPro64's default speed. Many other adapters use the same chip. I later looked up the chip's data sheet, which confirms that speed is not supported.

You can configure u-boot to pass a slower bit rate to the kernel and successfully launch linux that way, but some of the early boot process messages will still be sent at the default speed, so troubleshooting anything that early will be troublesome with an adapter that can't handle it.

Messages In This Thread
RE: UART->RS232 adapter that supports 1.5M? - by foresto - 08-20-2020, 03:46 PM

Possibly Related Threads…
Thread Author Replies Views Last Post
Bug Anyone else's UART RX (serial input) stopped working? pion 1 876 04-07-2022, 08:35 PM
Last Post: foresto
  RockPro64 doesn't boot when PCIe to M.2 adapter is installed Cerberus 3 2,122 11-27-2021, 11:38 PM
Last Post: Cerberus
  zfs on rockpro64 - any dual nvme PCI adapter for software raid ? romadr 0 1,382 04-22-2021, 02:59 PM
Last Post: romadr
  UART ttyS2 on RockPro64 for custom communication meier 2 3,529 08-22-2019, 06:35 AM
Last Post: meier
  pci-e m.2 adapter stuartiannaylor 0 1,263 08-09-2019, 07:09 AM
Last Post: stuartiannaylor
  using PINEBOOK Pro M.2/NGFF NVMe SSD Interface Adapter abdel 4 6,165 07-26-2019, 09:48 PM
Last Post: pfeerick
  PI-2 BUS UART zener 1 2,340 10-06-2018, 08:05 AM
Last Post: zener

Forum Jump:

Users browsing this thread: 1 Guest(s)