+++ title = "Miscellaneous notes" weight = 4 sort_by = "weight" insert_anchor_links = "right" +++ These are random AP-related notes that wouldn't fit anywhere else: ## DJI FPV configuration If you got some DJI goggles, here's the relevant configuration you need to make: 1. Set `OSD_TYPE=3`. 2. Set `SERIALn_PROTOCOL=33 SERIALn_BAUD=115 SERIALn_OPTIONS=0` (DJI FPV). 3. Create a text file called `naco.txt` on the SD card of the Air Unit with the text `1` in it [to unlock full power](https://oscarliang.com/dji-fpv-system-fcc-700mw/). 4. Create a text file called `naco_pwr.txt` on the SD card of the goggles with the text `pwr_2` in it [to unlock more full power](https://oscarliang.com/dji-fpv-system-1200mw-output/). 5. Set "Custom OSD" to "on" in the goggles menu. 6. Arrange your OSD elements how you like them. That's it! ## DMA on the Matek F405-Wing If you want to get DMA on UART3 of the Matek F405-Wing FC (or, more relatedly, the Racerstar F405, because UART1 is Bluetooth there), you can open `libraries/AP_HAL_ChibiOS/hwdef/MatekF405-Wing/hwdef.dat` and comment out line 92ish, where PA15 is defined. That will enable DMA on UART3, at the expense of disabling the LED pad. * * *

Last updated on October 22, 2021. For any questions/feedback, email me at hi@stavros.io.