USB-device-midi is missing helper function to send SysEx

USB-device-midi の実装とリンクされた pull request #1068 から始め、提案された helper と提供された例を比較してください。helper が SysEx パケットの 3 種類の終端を処理し、示されているように送信バッファが満杯であることを報告することを確認してください。完了とは、既存の MIDI 転送動作を重複させずに helper が統合されていることを意味します。

I was using USB-device-midi to send MTC to the host, which is essentially SysEx. But was slowed by the missing helper function to send the packet of SysEx. Anyhow, I wrote one...

Full example script here:
https://github.com/orgs/micropython/discussions/18450#discussioncomment-15043069

Happy to share with the project

    def send_sysex(self, p):
        # start of SysEx packet
        if len(p) > 3:
            w = self._tx.pend_write()
            if len(w) < 4:
                return False  # TX buffer is full. TODO: block here?

            w[0] = 0x4  # _CIN_SYSEX_START
            w[1] = p[0]
            w[2] = p[1]
            w[3] = p[2]
            self._tx.finish_write(4)
            self._tx_xfer()

            p = p[3:]

        # play out til end
        while p:
            if len(p) > 2:
                w = self._tx.pend_write()
                if len(w) < 4:
                    return False  # TX buffer is full. TODO: block here?

                w[0] = 0x7  # _CIN_SYSEX_END_3BYTE
                w[1] = p[0]
                w[2] = p[1]
                w[3] = p[2]
                self._tx.finish_write(4)
                self._tx_xfer()

                p = p[3:]
            elif len(p) > 1:
                w = self._tx.pend_write()
                if len(w) < 4:
                    return False  # TX buffer is full. TODO: block here?

                w[0] = 0x6  # _CIN_SYSEX_END_2BYTE
                w[1] = p[0]
                w[2] = p[1]
                w[3] = 0
                self._tx.finish_write(4)
                self._tx_xfer()

                p = p[2:]
            else:
                w = self._tx.pend_write()
                if len(w) < 4:
                    return False  # TX buffer is full. TODO: block here?

                w[0] = 0x5  # _CIN_SYSEX_END_1BYTE
                w[1] = p[0]
                w[2] = 0
                w[3] = 0
                self._tx.finish_write(4)
                self._tx_xfer()

                p = p[1:]

        return True