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Update README

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Florian Jung 2021-04-13 01:03:24 +02:00
parent dd71bcaeb0
commit 1cac50dd5d
1 changed files with 18 additions and 2 deletions
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README.md
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@ -35,7 +35,7 @@ fn main() -> ! {
let usb_bus = UsbBus::new(usb);
let mut midi = MidiClass::new(&usb_bus);
let mut midi = MidiClass::new(&usb_bus, 1, 1);
let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x16c0, 0x5e4))
.product("MIDI Test")
@ -68,4 +68,20 @@ fn main() -> ! {
}
}
}
```
```
## Using more than one MIDI port
Calling `MidiClass::new(&usb_bus, N, M);` with `N, M >= 1` to provide more
than one input or output port requires the `control-buffer-256` feature of
the usb-device crate:
Cargo.toml:
```
usb-device = { version = ">=0.2.1", features = ["control-buffer-256"] }
```
Up to 5 in/out pairs can be used this way until we again run out of buffer
space. Note that exceeding the available buffer space will silently fail
to send the descriptors correctly, no obvious `panic!` will hint the
actual problem.