[BUG] Serial baudrate is too high

[ErikS-web]

BEFORE YOU CREATE A BUG REPORT MAKE SURE YOU READ THIS: https://github.com/kamilsss655/uv-k5-firmware-custom/wiki/80-%E2%80%90-Tips-&-Tricks-and-Known-Issues

Describe the bug Functional serial baudrate is out of spec's for my USB-to serial interface Tested with CH340 and a Prolific

To Reproduce Loading firmware (with bootloader) had his own speed. SoO no problem there, Radio functions OK. But the serial communication at this new high speed between radio and PC does not work

Tested with Chirp in Developement mede and modified PY-file.; Lookup "baud" and change 384000 to 250000

Expected behavior release notes mention

• messenger uart enabled (use 250000 baud)
• CHIRP driver needs to be changed to 250000 baud as well

Pictures/video

Details:

• Firmware version: 21.2 pre-release
• Other project had same experince and explained... https://arduino.stackexchange.com/questions/41856/ch340-max-serial-speed

CHG340 supports common baud rates: 50, 75, 100, 110, 134.5, 150, 300, 600, 900, 1200, 1800, 2400, 3600, 4800, 9600, 14400, 19200, 28800, 33600, 38400, 56000, 57600, 76800, 115200, 128000, 153600, 230400, 460800, 921600, 1500000, 2000000 baud. 250 000 baud isn't supported by that IC. The Baud steps is either 200% or 150% of the previous value (There is exceptions).

Also here https://arduino.stackexchange.com/questions/32035/what-usb-to-uart-chip-provides-highest-data-rates-with-arduino-boards

• FT232R (FTDI): 183 to 3M baud, including 250k, 500k and 1M, 128 RX / 256 TX FIFO
• PL2303 (Prolific): 75 to 1.2M baud, not including 250k, 500k and 1M, 256 RX / 256 TX FIFO
• CP2102 (Silicon Labs): 300 to 921600 baud, including 250k and 500k, 576 RX / 640 TX FIFO
• CH340G (WCH): 50 to 2M baud, not including 250k, 500k and 1M, unknown FIFO size

Suggest to use 230400

[fenton67]

I don't know if it will be possible, but I have this dream of using messenger with the cardkb for messenger text entry. The reason I mention is because it supports only 115,200. Just throwing that out there cause it's always a challenge to type long messages or extended conversation. I think it is doable: https://github.com/jon7sky/CardKB_UART.

[ErikS-web]

This is about serial communication between the Radio and the ESPRI-project.

We are experiencing what is possible as fast option. So 115K is much to low.

[kamilsss655]

Resolved in v.21.4.

Works with: ftdi, ch340 and prolific