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add support for sound pressure level measurements

This commit is contained in:
Bert Vermeulen 2012-11-02 15:20:10 +01:00
parent 258eeb77b8
commit fc19c288b5
1 changed files with 31 additions and 0 deletions
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31
libsigrok.h
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@ -173,6 +173,9 @@ enum {
SR_MQ_POWER,
/** Gain (a transistor's gain, or hFE, for example). */
SR_MQ_GAIN,
/** Logarithmic representation of sound pressure relative to a
* reference value. */
SR_MQ_SOUND_PRESSURE_LEVEL,
};
/** Values for sr_datafeed_analog.unit. */
@ -203,6 +206,8 @@ enum {
* a unitless quantity, for example.
*/
SR_UNIT_UNITLESS,
/** Sound pressure level relative so 20 micropascals. */
SR_UNIT_DECIBEL_SPL,
};
/** Values for sr_datafeed_analog.flags. */
@ -225,6 +230,30 @@ enum {
SR_MQFLAG_AUTORANGE = 0x80,
/** Device is in relative mode. */
SR_MQFLAG_RELATIVE = 0x100,
/** Sound pressure level is A-weighted in the frequency domain,
* according to IRC 61672:2003. */
SR_MQFLAG_SPL_FREQ_WEIGHT_A = 0x200,
/** Sound pressure level is C-weighted in the frequency domain,
* according to IRC 61672:2003. */
SR_MQFLAG_SPL_FREQ_WEIGHT_C = 0x400,
/** Sound pressure level is Z-weighted (i.e. not at all) in the
* frequency domain, according to IRC 61672:2003. */
SR_MQFLAG_SPL_FREQ_WEIGHT_Z = 0x800,
/** Sound pressure level is not weighted in the frequency domain,
* albeit without standards-defined low and high frequency limits. */
SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT = 0x1000,
/** Sound pressure level measurement is S-weighted (1s) in the
* time domain. */
SR_MQFLAG_SPL_TIME_WEIGHT_S = 0x2000,
/** Sound pressure level measurement is F-weighted (125ms) in the
* time domain. */
SR_MQFLAG_SPL_TIME_WEIGHT_F = 0x4000,
/** Sound pressure level is time-averaged (LAT), also known as
* Equivalent Continuous A-weighted Sound Level (LEQ). */
SR_MQFLAG_SPL_LAT = 0x8000,
/** Sound pressure level represented as a percentage of measurements
* that were over a preset alarm level. */
SR_MQFLAG_SPL_PCT_OVER_ALARM = 0x10000,
};
struct sr_context;
@ -400,6 +429,8 @@ enum {
/** The device is a demo device. */
SR_HWCAP_DEMO_DEV,
/** The device can act as a sound level meter. */
SR_HWCAP_SOUNDLEVELMETER,
/*--- Device configuration ------------------------------------------*/