I’m not writing to the UART - I am reading. Regards, Mark ------------------------------------------- Mark Stevens Blog: blog.mark-stevens.co.uk
> On 9 May 2024, at 17:40, Mark Stevens > <mark.stev...@wildernesslabs.co.INVALID> wrote: > > This is a direct connection between the two chips on a PCB. > > Regards, > Mark > — > Mark Stevens > mark.stev...@wildernesslabs.co > > > > > > >> On 9 May 2024, at 17:38, Bill Rees <redskyo...@icloud.com.INVALID> wrote: >> >> >> I've seen this problem before which revolved around flow control; >> essentially soft versus hard flow control (xmit off/ xmit on) >> >> Are you using a null modem cable? If not that may give you the accuracy >> you're looking for, else hardware flow control is the only other possibility >> if it is flow control. >> >> Bill >> >> On 5/9/2024 9:24 AM, Tomek CEDRO wrote: >>> On Thu, May 9, 2024 at 6:15 PM Mark Stevens >>> <mark.stev...@wildernesslabs.co.invalid> wrote: >>>> Yes, I am sure both side are configured correctly. >>>> If I run the kernel code only then all works as expected. >>>> If I run user space code alone all works as expected. >>>> The problems happen when I transition from kernel use of the UART to user >>>> space use of the UART. >>>> I have also connected a logic analyser to the system and all looks good. >>>> Also, my current problem is NuttX reading data not sending it. Sending >>>> may also be a problem but I have not got that far at the moment. >>> Which UART do you use? What happens when you use different UART? Are >>> you sure it does not interfere with console? >>> >>> -- >>> CeDeROM, SQ7MHZ, http://www.tomek.cedro.info >> >
