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Merge pull request #270 from PetruSoroaga/patch-4 

Update fpv.md
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Signor Pellegrino 2023-11-23 00:21:12 +03:00 committed by GitHub
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@ -216,7 +216,7 @@ wfb-cli gs
If the recv value remains zero and the d_err value increases, the camera and ground station keys probably do not match. Make sure that /etc/gs.key is copied to the ground station. If no packages are present - make sure that `channel=xx` in /etc/wfb.conf on the camera and `wifi_channel=xx` in /etc/wifibroadcast.cfg on the ground have the same values. For the 5.8 GHz range of the RTL8812AU adapter, channels 60 and above are recommended.
* Configure the flight controller under ArduPilot to output telemetry in mavlink1 format at speed 115200 on e.g. port Serial1. In case of one-way telemetry (downlink only), make sure that the FC outputs the required telemetry stream by default, without connection to the ground station. This is accomplished through setting the SR1_xxx parameters, see [mavlink SR_ parameters]. [mavlink SR_ parameters](https://ardupilot.org/dev/docs/mavlink-requesting-data.html).
* Connect Serial1 of the PC to the UART of the camera, rx to tx, tx to rx. In case of modern PCs on STM32F4/7 the voltage levels are the same (3.3V), in case of 5V APM a level conversion will be required. The subtlety is the camera U-Boot boot loader stops on boot after receiving any bytes on the UART input. The PC should start outputting telemetry c delayed by a few seconds, through setting the TELEM_DELAY parameter. On the table it is easier to provide a break in the line from the PC to the camera.
* Connect Serial1 of the FC to the UART of the camera, rx to tx, tx to rx. In case of modern FCs on STM32F4/7 the voltage levels are the same (3.3V), in case of 5V APM a level conversion will be required. The subtlety is the camera U-Boot boot loader stops on boot after receiving any bytes on the UART input. The PC should start outputting telemetry c delayed by a few seconds, through setting the TELEM_DELAY parameter. On the table it is easier to provide a break in the line from the FC to the camera.
* On the camera in /etc/datalink.conf file set the `telemetry=true` parameter, in /etc/telemetry.conf file set the `one_way=true` parameter for one-way or `one_way=false` for two-line telemetry respectively. The simplest way to edit files on the camera is Shell Link in Midnight Commander:
*
![mc_shell_link](../images/MC_shell_link.png)