[SOLVED] Problem with update serial bitrate

[konczakp]

Hello,
I’m having problem with changing the bitrate. When doing everything like in manual (on SD card (update partition) file with name bitrate and digits inside without \n\r) nothing happens. MOVI is not changing anything. I’ve also tried to upload update from audeme site to see what will happen but as with bitrate nothing has changed. Movi is booting normally saying booting and then ready. Low level communication is not showing anything. Changing bitrate is very important for me as I’m working with stm32f411 which can go up do 2000000 bps and I don’t want to loose cpu cycles for reading 9600bps HardwareSerial. What to do to change it?

[Dylan]

I believe you need that firmware update before the bitrate file will do anything. I think you are doing something incorrect in the firmware update process. It has been quite some time since I applied the update so I don’t remember all the steps. Read the update instructions carefully again and get that to work before expecting the bitrate to change.

[konczakp]

Update has nothing to do with that. I already have version 1.1. I just put the update file on sd card to see if something will happen. Main problem is that the board is not reacting for any file in sd update in my opinion. When setting the file with bitrate nothing is changing after reboot.

[Dylan]

It works for me, I’m using 115200.

Did you make sure that the filename bitrate is all lower case? That is the only thing I can think of.

MOVI will not re-do the update if you already have 1.1, it’ll blow past it.

[konczakp]

Please see the attached printscreen. There is a filename, directory and speed setting showed. Maybe I got blind but I really don’t see any mistake

Is there other way to change that ?

[Dylan]

I am betting that you are attempting to use a non-supported bitrate and the stty command is erroring out internally and not setting the bitrate. If MOVI is anything like a Raspberry PI, which there is a good chance that it is, I found this in terms of supported bitrates on Raspberry PI. 250000 is not in the list.

Re: Can the UART go faster than 115200?
Quote
Wed Aug 13, 2014 3:38 pm

Above 115200 kbps, these values are supported by stty: 230400, 460800, 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, 2500000, 3000000, 3500000 and 4000000.

Reference: coreutils.info section 19.2.7 Special settings. Use “info stty” to read the built-in info file.

[konczakp]

BINGO! Thanks Dylan! This was it. Now I’m able to set 1500000 bps (this is max for this setup). My STM32F411 could go up to 12.5 Mbps but I was not able to set that high speed with movi. but 1500000 is way better than 9600. Thanks again!

[Dylan]

The supported bitrates should really be in the manual. Anyone could have gotten hung up on that. Maybe Gerald will make some amendments to the manual for this.

Dylan.