# SND_StartTimer

## C Specification

      #include <nitro/snd.h>

      void SND_StartTimer(
              u32 chBitMask,
              u32 capBitMask,
              u32 alarmBitMask,
              u32 flags );

## Arguments

`chBitMask` | The channel bit mask. It specifies which channels to control.
`capBitMask` | The capture bit mask. It specifies which captures to control.
`alarmBitMask` | The alarm bit mask. It specifies which Sound alarms to control.
`flags` | Option flags. At the current time the flags are not used, so 0 is entered here.

## Return Values

None.

## Description

Starts timers.

By specifying numerous channels, captures and alarms all at once, you can start them all with the same timing. The order is: channel -> capture -> alarm. The individual channels, captures and alarms must have already been set up using the `SND_SetupChannelPcm`, `SND_SetupCapture` and `SND_SetupAlarm` functions.

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.

The capture bit mask `capBitMask` specifies which captures to control. `SND_CAPTURE_0` would be ( 1 << `SND_CAPTURE_0` ), while `SND_CAPTURE_1` would be ( 1 << `SND_CAPTURE_1` ). Enter with a logical OR to specify both.

The Sound alarm bit mask `alarmBitMask` specifies which Sound alarms to control. The alarms are represented in order, with the lowest bit representing alarm 0. Only alarms whose representative bits are standing are controlled.

### Caution

This function is an ARM7 reserved function. After this function is called, processing occurs only after the command is issued with the `SND_FlushCommand` function.

When it is necessary to synchronize something with the completion of the process, first use `SND_GetCurrentCommandTag` to obtain the command tag immediately after calling this function. After the command is issued, use the command tag and call either the `SND_IsFinishedCommandTag` or `SND_WaitForCommandProc` function to confirm that the process has finished or to wait for it to complete.

## See Also

`SND_SetupChannelPcm, SND_SetupCapture, SND_SetupAlarm, SND_FlushCommand, SND_GetCurrentCommandTag, SND_IsFinishedCommandTag, SND_WaitForCommandProc`

## Revision History

02/17/2005 Added a note about ARM7 command processing
07/20/2004 Initial version

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