User`s guide

Architecture
5-38 AT85C51SND3Bx Firmware User’s Guide
7691A–MP3–08/07
The USB module does not include public routines.
5.6.2 Player Interface The Player module controls the audio features of the chip:
– it interfaces the audio processor
– it manages the playing of audio files (play, stop, pause, …)
In player module, only the bargraph feature can’t be immediatly executed, then this must
be executed via a command and event.
Table 5-14. Player commands
The player task sends only one event “ EVT_PLAYER” with differents arguments.
Table 5-15. Player event arguments
EVT_USB_HOST_HID_MOUSE_BTN2 USB host has received an event “clic bouton 2” via a HID
device.
EVT_USB_HOST_HID_MOUSE_BTN3 USB host has received an event “clic bouton 3” via a HID
device.
EVT_USB_HOST_HID_MOUSE_MOVE USB host has received an event “mouse move” via a HID
device.
EVT_USB_HOST_HID_KB_KEY USB has received an event “key press” via a HID device.
EVT_USB_HOST_CDC_CHANGE A CDC device has been detected or disconnected.
Event Label Description
Command Label Description
CMD_PLAYER_GET_BARGRAPH Ask a bargraph data.
The result is sent by player task via a event.
Arguments of “EVT_PLAYER” Description
PLAYER_BOF Beginning of the played file reached.
Note: player_task_stop() is automaticly executed.
PLAYER_EOF End of the played file reached, the player is stopped.
Note: player_task_stop() is automaticly executed.
PLAYER_ERROR_UNDERRUN Under-run occurred but play continues
PLAYER_ERROR_SYNCH Audio processor synchronization lost but play continues
PLAYER_START_AB Play of the AB track has restarted
PLAYER_EOF_AB End of the played AB track, start the research of A position
PLAYER_BARGRAPH Bargraph resultat of command CMD_PLAYER_GET_BARGRAPH