SND_SetChannelTimer 
Syntax
#include <nitro/snd.h>void SND_SetChannelTimer( u32 chBitMask, int timer );
Arguments
chBitMask |
The channel bit mask. It specifies which channels to control. |
timer |
The timer. Takes a value between 0x10 and 0xffff. |
Description
Changes the channel timer.
The channel bit mask chBitMask specifies which channels to control. The channels are represented in order, with the lowest bit representing channel 0. Only channels whose representative bits are standing are controlled.
timer specifies the number of clock ticks for outputting one sample. The number of ticks per second is approximately 16.757 MHz with SND_TIMER_CLOCK. Thus, if you want to play the waveform data without changing the pitch, and the sampling rate is rate Hz, then you calculate timer as follows:
timer= SND_TIMER_CLOCK /rate
Note
This function is an ARM7 reserved function. After this function is called, its processing will occur only after the command is issued with the SND_FlushCommand function.
If program execution must be synchronized with process completion, first use the SND_GetCurrentCommandTag function to obtain the command tag immediately after calling this function. Then, after the command is issued, use the command tag and call either the SND_IsFinishedCommandTag or SND_WaitForCommandProc function to confirm that processing has finished or to wait for it to complete.
See Also
SND_FlushCommand, SND_GetCurrentCommandTag, SND_IsFinishedCommandTag, SND_WaitForCommandProc
Revision History
2005/02/17 Added a note about ARM7 command processing.
2004/07/20 Initial version.