XgmSetBusProtection

Last Modified: 1/3/2021

Enable 68000 bus protection during DMA.

Arguments

Name	Type	Required	Description
Enabled	Boolean	Yes	Enable or disable bus protection using True or False.

Example

Syntax: XgmSetBusProtection <Enabled>

XgmTrack MyMusicTrack     XgmStartMusic          On vInt GoSub Vbl     Enable vInt          While 1         j = JoyPad()         If j.0 Then             XgmSetTempo 100         End If         If j.1 Then             XgmSetTempo 30         End If         WaitPadUp 0         Sleep 1     Wend      Vbl:     XgmVintProc       XgmSetBusProtection True     DmaLoad MyTiles,1,0     XgmSetBusProtection False     Return   MyTiles:    DataLong $11111111    DataLong $11111111    DataLong $11111111    DataLong $11111111    DataLong $11111111    DataLong $11111111    DataLong $11111111    DataLong $11111111    DataLong $22222222    DataLong $22222222    DataLong $22222222    DataLong $22222222    DataLong $22222222    DataLong $22222222    DataLong $22222222    DataLong $22222222    DataLong $22222222

Remarks

This will help prevent degredation of XGM's playback during DMA operations. XGM expects DMA operations to happen during the VBlank, so that's where this would work best.

See Also

XgmPlayPcm, XgmResumeMusic, XgmSetPcm, XgmSetTempo, XgmStartMusic, XgmStopMusic, XgmStopPcm, XgmTrack, XgmVintProc