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qmk_firmware/docs/internals_midi_util.md

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# group `midi_util` {#group__midi__util}
## Summary
Members | Descriptions
--------------------------------|---------------------------------------------
`enum `[`midi_packet_length_t`](#group__midi__util_1gae29ff56aee2b430ffe53933b97e5e79e) | An enumeration of the possible packet length values.
`public bool `[`midi_is_statusbyte`](#group__midi__util_1ga12e3b42ff9cbb4b4f2bc455fc8743ee5)`(uint8_t theByte)` | Test to see if the byte given is a status byte.
`public bool `[`midi_is_realtime`](#group__midi__util_1gad2f52c363e34a8000d80c983c324e2d7)`(uint8_t theByte)` | Test to see if the byte given is a realtime message.
`public `[`midi_packet_length_t`](#group__midi__util_1gae29ff56aee2b430ffe53933b97e5e79e)` `[`midi_packet_length`](#group__midi__util_1gaa168b43af6ae9de0debce1625e4b8175)`(uint8_t status)` | Find the length of the packet associated with the status byte given.
## Members
#### `enum `[`midi_packet_length_t`](#group__midi__util_1gae29ff56aee2b430ffe53933b97e5e79e) {#group__midi__util_1gae29ff56aee2b430ffe53933b97e5e79e}
Values | Descriptions
--------------------------------|---------------------------------------------
UNDEFINED |
ONE |
TWO |
THREE |
An enumeration of the possible packet length values.
#### `public bool `[`midi_is_statusbyte`](#group__midi__util_1ga12e3b42ff9cbb4b4f2bc455fc8743ee5)`(uint8_t theByte)` {#group__midi__util_1ga12e3b42ff9cbb4b4f2bc455fc8743ee5}
Test to see if the byte given is a status byte.
#### Parameters
* `theByte` the byte to test
#### Returns
true if the byte given is a midi status byte
#### `public bool `[`midi_is_realtime`](#group__midi__util_1gad2f52c363e34a8000d80c983c324e2d7)`(uint8_t theByte)` {#group__midi__util_1gad2f52c363e34a8000d80c983c324e2d7}
Test to see if the byte given is a realtime message.
#### Parameters
* `theByte` the byte to test
#### Returns
true if it is a realtime message, false otherwise
#### `public `[`midi_packet_length_t`](#group__midi__util_1gae29ff56aee2b430ffe53933b97e5e79e)` `[`midi_packet_length`](#group__midi__util_1gaa168b43af6ae9de0debce1625e4b8175)`(uint8_t status)` {#group__midi__util_1gaa168b43af6ae9de0debce1625e4b8175}
Find the length of the packet associated with the status byte given.
#### Parameters
* `status` the status byte
#### Returns
the length of the packet, will return UNDEFINED if the byte is not a status byte or if it is a sysex status byte