usb_midi –通过 USB 的 MIDI

usb_midi 模块包含通过 USB 传输和接收 MIDI 消息的类。

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usb_midi.ports :Tuple[Union[PortIn, PortOut], Ellipsis]

所有 MIDI 端口的元组。每个项目都是 etherPortInPortOut.

usb_midi.disable()None

禁止向主机展示 USB MIDI 设备。该设备通常默认启用,但在某些端点有限的板上,包括 ESP32-S2 和某些 STM 板,默认情况下是禁用的。可以在 boot.py连接USB之前调用。

usb_midi.enable()None

启用向主机呈现 USB MIDI 设备。该设备默认启用,因此您通常不需要调用此函数。可以在boot.py连接USB之前调用。

如果您一次启用太多设备,您将耗尽 USB 端点。可用端点的数量因微控制器而异。CircuitPython 将在运行 boot.py 后进入安全模式,以通知您是否没有足够的端点可用。

class usb_midi.PortIn

通过 USB 接收 MIDI 命令

您不能创建 的实例usb_midi.PortIn

PortIn 对象是为 USB 描述符中的每个相应条目构造的,并添加到usb_midi.ports 元组中。

read(self, nbytes: Optional[int] = None)Optional[bytes]

读取字符。如果nbytes指定,则最多读取那么多字节。否则,读取到达的所有内容,直到连接超时。强烈建议提供预期的字节数,因为它会更快。

返回

数据读取

返回类型

字节None

readinto(self, buf: _typing.WriteableBuffer, nbytes: Optional[int] = None)Optional[bytes]

将字节读入 buf. 如果 nbytes指定,则最多读取那么多字节。否则,最多读取 len(buf) 字节。

返回

读取和存储的字节数 buf

返回类型

字节None

class usb_midi.PortOut

通过 USB 向计算机发送 MIDI 信息

您不能创建 的实例 usb_midi.PortOut.

PortOut 对象是为 USB 描述符中的每个相应条目构造的,并添加到usb_midi.ports 元组中。

write(self, buf: _typing.ReadableBuffer)Optional[int]

将字节缓冲区写入总线。

返回

写入的字节数

返回类型

整数None