MICSamplingRate

Definition

#include <nitro/spi.h>
typedef enum
{
	MIC_SAMPLING_RATE_8K	= ( HW_CPU_CLOCK_ARM7 /  8000 ) ,
	MIC_SAMPLING_RATE_11K	= ( HW_CPU_CLOCK_ARM7 / 11025 ) ,
	MIC_SAMPLING_RATE_16K	= ( HW_CPU_CLOCK_ARM7 / 16000 ) ,
	MIC_SAMPLING_RATE_22K	= ( HW_CPU_CLOCK_ARM7 / 22050 ) ,
	MIC_SAMPLING_RATE_32K	= ( HW_CPU_CLOCK_ARM7 / 32000 )
	MIC_SAMPLING_RATE_LIMIT	= 1024

} MICSamplingRate;

Elements

MIC_SAMPLING_RATE_8K 8 kHz
MIC_SAMPLING_RATE_11K 11.025 kHz
MIC_SAMPLING_RATE_16K 16 kHz
MIC_SAMPLING_RATE_22K 22.05 kHz
MIC_SAMPLING_RATE_32K 32 kHz
MIC_SAMPLING_RATE_LIMIT The shortest sampling rate that is supported.

Description

This is a list of the sampling rates.
These values define typical sampling rates that are converted into ARM7 timer cycles.

Note

The ARM7 can support sampling rates up to MIC_SAMPLING_RATE_LIMIT when devoted to microphone sampling, but we cannot guarantee this when the ARM7 is also being used for sounds and other features. Please specify an appropriate rate, keeping in mind the load placed on the ARM7.
The ARM7 timer is set in units of CPU clock ticks, so appreciate that error is built into the defined frequencies.

See Also

MIC_StartAutoSampling, MIC_StartAutoSamplingAsync

Revision History

2004/06/01 Initial version.

CONFIDENTIAL