Crossfire / Manba f4

B

Batman 220

Member
Hi

Need some advice before I purchase the crossfire micro bundle. I run the manba f4 stack in all my race builds and use the taranis QX7. Also run XM receivers currently.

1. Will the crossfire mod be compatible with the manba f4 fc due to uart inversion / un inversion. And is it possible to change in the cli to make it work?

2. Does crossfire need two uarts (receive and transmit) I assume a third uart is not required for smart audio? I'm limited on uarts on the manba stack.

3. Should I be looking at the access protocol instead to reduce latency?

Thanks in advance you guys have been awesome in the past.
 
Batman 220 said:
Hi

Need some advice before I purchase the crossfire micro bundle. I run the manba f4 stack in all my race builds and use the taranis QX7. Also run XM receivers currently.

1. Will the crossfire mod be compatible with the manba f4 fc due to uart inversion / un inversion. And is it possible to change in the cli to make it work?

2. Does crossfire need two uarts (receive and transmit) I assume a third uart is not required for smart audio? I'm limited on uarts on the manba stack.

3. Should I be looking at the access https://zumbaliciouscrew.com/en/zumba-at-home protocol instead to reduce latency?

Thanks in advance you guys have been awesome in the past.
Click to expand...
Hey,

You shouldn’t run into any major issues switching to Crossfire with a Mamba F4 stack. Crossfire uses the CRSF protocol, which is an uninverted signal, so unlike your XM receivers you won’t be using the SBUS pad. On F4 flight controllers inversion is handled in hardware, not through CLI, so there’s nothing you really need to tweak there just make sure you wire the receiver to a normal UART (TX and RX pads), not the inverted SBUS input. As for UART usage, Crossfire only needs a single UART but it does require both TX and RX lines because it’s a bidirectional protocol. That means control and telemetry go through the same connection, so you don’t need an extra UART just for telemetry. In most setups you also won’t need a separate UART for SmartAudio since Crossfire can handle that via telemetry passthrough, which is handy if you’re limited on UARTs like with the Mamba boards.

Regarding ACCESS vs Crossfire, the latency difference isn’t something you’re realistically going to notice unless you’re flying at a very high competitive level. What tends to matter more is link reliability and consistency, and Crossfire still has a strong reputation there, especially for range and signal penetration. ACCESS is fine, but it doesn’t really offer a clear advantage over Crossfire in a typical setup. So overall, Crossfire will work well with your build, it won’t eat more UARTs than necessary, and you don’t need to mess with inversion settings as long as you wire it to the correct pads.
 
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