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oelprinz-org / BlitzboxBL49sp

blitzBOX - low-cost and mini-sized ECU for speeduino firmware (45 x 58 mm)
https://github.com/oelprinz-org/BlitzboxBL49sp
GNU General Public License v3.0
32 stars 12 forks source link

[solved] V 0.1.2 speeduino firmware stops working when pulling the USB plug #5

Closed chaoschris closed 1 year ago

chaoschris commented 2 years ago

V 0.1.2 speeduino firmware stops working when pulling the USB plug. With the USB plug connected all works fine

SW65 commented 2 years ago

Und was haben die als Lösung?

Am 25.04.2022 um 12:16 schrieb chaoschris @.***>:

V 0.1.2 speeduino firmware stops working when pulling the USB plug. With the USB plug connected all works fine

— Reply to this email directly, view it on GitHub https://github.com/oelprinz-org/BlitzboxBL49sp/issues/5, or unsubscribe https://github.com/notifications/unsubscribe-auth/ATHEOHNI5SRD5PJHJTUHPJLVGZWIBANCNFSM5UICK6IA. You are receiving this because you are subscribed to this thread.

chaoschris commented 2 years ago

Shutting down the power supply of the Cp2102 converter chip leads to a constant voltage level of 0 V on the RX line of the Atmega2560. This can be fixed temporary with a 10k Pullup from RX to +5V as shown in the picture. Further investigation will follow soon before the next/final pcb revision. RX_Pullup_1ok

SW65 commented 2 years ago

Lösung ist halt ohne Zigarettenanzünder mit usb Kabel und kleiner:-) Liegt nicht an der Firmware?

Melde mich später mal .

Grüße Jörg

Am 25.04.2022 um 18:23 schrieb chaoschris @.***>:

Shutting down the power supply of the Cp2102 converter chip leads to a constant voltage level of 0 V on the RX line of the Atmega2560. This can be fixed temporary with a 10k Pullup from RX to +5V as shown in the picture. Further investigation will follow soon before the next/final pcb revision. https://user-images.githubusercontent.com/42533712/165131651-6544312a-db7a-48ae-af08-ae1adf7c4e14.png — Reply to this email directly, view it on GitHub https://github.com/oelprinz-org/BlitzboxBL49sp/issues/5#issuecomment-1108783324, or unsubscribe https://github.com/notifications/unsubscribe-auth/ATHEOHISZVCVE2U6NNJVH43VG3BGXANCNFSM5UICK6IA. You are receiving this because you commented.

chaoschris commented 2 years ago

Doesn't look like a firmware issue. The original Arduino Mega 2560 design also has two inline resistors with 1K on RX and TX. Will have a deeper look on this later.

chaoschris commented 1 year ago

solved in V0.1.3