nRF51822 SDK10 printf characters out of order with 921000 baud rate

RE: nRF51822 SDK10 printf characters out of order with 921000 baud rate

awneil — Fri, 27 Nov 2015 12:34:01 GMT

www.youtube.com/watch

RE: nRF51822 SDK10 printf characters out of order with 921000 baud rate

awneil — Fri, 27 Nov 2015 12:32:03 GMT

Seems unlikely to be a hardware/signal issue if he's receiving all the correct characters - just not in the correct order ?

RE: nRF51822 SDK10 printf characters out of order with 921000 baud rate

ovrebekk — Fri, 27 Nov 2015 11:52:14 GMT

Hi Bruce

I did some testing, and while my PC is unable to receive anything meaningful at 921600 (I tried Putty and Tera Term), the signal looks fine on the scope. I don't see any characters being sent out of order, and I am using SDK v10.

What I do see is that there is quite a lot of delay between bytes, so I don't think you will gain much speed by going to 921600 unless you use a more optimized driver (I used app_uart_fifo for the test).

Best regards
Torbjørn

RE: nRF51822 SDK10 printf characters out of order with 921000 baud rate

Bruce — Tue, 24 Nov 2015 22:12:13 GMT

I don't think it's a RX issue otherwise I would have seen it with all the previous SDKs. I'm using PuTTY 0.63

RE: nRF51822 SDK10 printf characters out of order with 921000 baud rate

ovrebekk — Tue, 24 Nov 2015 09:57:04 GMT

Hi Bruce

I haven't heard any reports about similar issues with the UART in the nRF51.

What are you using to receive the UART data?

Have you verified the UART signals with a scope to see if the problem is there on the physical connection, or if it is a reception issue?

Regards
Torbjørn