Meetings are almost done for the day, which means it's time to start @nerves-project.org bring-up ⚡️🌱
Will be documenting progress here
Will be documenting progress here
Comments
5.11V on the 5V output
3.32V on the 3.3V output
0.904V on the 0.9V output
And the power LED lights up! In total, with the board powered but no code running we are consuming 27mA @ 6V input, or about 150mW
https://github.com/linux-sunxi/sunxi-tools
Nothing 😅
No USB device is showing up, so I guess that means I have some hardware debugging to do
- The reset pin is pulled low
- The crystal oscillator load caps have the wrong value
- The ESD diodes are interfering with the USB signal
I'm thinking either option 1 or 2, because 27mA current draw seems low, even for the processor at idle
The reset timing is a little complicated, but it essentially needs to hit 3.3V after at least 64ms after the other power rails have stabilized. I designed for 240ms of delay. But looks like that's not working, so time for some solder surgery