Error in SOS_IIR_Filter

[anjalir14]

Hello,

I'm working on the ICS-43434 sensor. I want to run this code on STM32 IDE but struck over the file SOS_IIR_Filter.h and the line is struct SOS_IIR_Filter. since I'm new to C++. so, I don't know the struct constructor, can you please tell me the logic that how to convert the noise into dB?

Please reply to me as soon as possible.
Thank you.

[fbell58]

hello same problem I get compilation error on the structur constructor in C++ (arduino 2 esp core 5.1)

SOS_IIR_Filter INMP441 = (
gain: 1.00197834654696,
sos: { // Second-Order Sections {b1, b2, -a1, -a2}
{ -1.986920458344451, +0.986963226946616, +1.995178510504166, -0.995184322194091 } }
);

compilation give the following error

/Volumes/Data/Arduino/production/sonde_sonore_jeedom_v3/sonde_sonore_jeedom_v3.ino:166:4: error: 'gain' was not declared in this scope
166 | gain: 1.00197834654696,
| ^~~~
/Volumes/Data/Arduino/production/sonde_sonore_jeedom_v3/sonde_sonore_jeedom_v3.ino:166:8: error: expected ')' before ':' token
166 | gain: 1.00197834654696,
| ^
| )
/Volumes/Data/Arduino/production/sonde_sonore_jeedom_v3/sonde_sonore_jeedom_v3.ino:165:26: note: to match this '('
165 | SOS_IIR_Filter INMP441 = (
| ^
/Volumes/Data/Arduino/production/sonde_sonore_jeedom_v3/sonde_sonore_jeedom_v3.ino:224:1: error: designated initializers cannot be used with a non-aggregate type 'SOS_IIR_Filter'
224 | };
| ^

exit status 1

Compilation error: 'gain' was not declared in this scope