On 21/12/20 5:59 pm, Gwen Stouthuysen wrote: > I have had an analogous issue a while ago when I was confronted with a boot > issue on a device. > I discovered that the serial parameters differ from how the power is > applied to the board: when using a direct USB connection with a host PC the > serial interface functioned as described. > When using a USB power supply or the 5V power input the serial parameters > are different, I saw data coming in, but could not read them.
I wonder if it uses 9600 baud somewhere as a default? Pretty common serial baud rate for consoles. Might be worth putting an oscilloscope or logic analyser on the TxD pin and measuring what the bit period is, maybe see if there are 8 logical "bits" between the start bit (logic 0) and stop bit (logic 1) or see if there's a 9th bit somewhere? -- Stuart Longland (aka Redhatter, VK4MSL) I haven't lost my mind... ...it's backed up on a tape somewhere. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/292c60eb-196e-8745-02f0-d5cd60901cfd%40longlandclan.id.au.
