About VerenaSchmidt11

VerenaSchmidt11 · ‎06-18-2021

Hi, I am trying (again) to do a FFT Noise analysis with the Bosch XDK. It's my second or third trial... I already learned that one member has a personal solution - but unfortunately that one is not publicly available The RTOS-Timer theoretically allows 1ms delays for each task. After trying that out I saw that the only realistic value is 10ms. I come to a similar value (about 9ms) when I don't use a timer, but a loop and just try to get the information as fast as possible and write the timer_counter in parallel. --> so my first question is - how is it possible to increase the frequency to record samples ? << 10ms --> in the first step, in order to know what I am doing, I also want to store that information on SD-File (e.g. every x samples read into an array). I can write batch of data on the SD card, those samples are taken every ~9ms. --> is there a working solution for FFT with Noise available? - the solution shown on XDK homepage does not show big knowledge regarding FFT of noise, beginning with a timer of 100ms - 10 Hz sampling frequency, which is much too low for analysing noise. Honestly, I don't understand why this webpage on noise was not updated by Bosch as this part is no promotion... Thanks, Verena

VerenaSchmidt11 · ‎05-01-2021

Hi, could you please discribe in greater detail where and how to integrate the mbedtls macros on xdk110/common/application.mk makefile. Thank you very much, Verena

VerenaSchmidt11 · ‎10-30-2020

Hi, how can I decode the timestamp that I get with the sntp-request: retcode = SNTP_GetTimeFromServer(&sntpTimeStampFromServer, APP_RESPONSE_FROM_SNTP_SERVER_TIMEOUT); What should a printf-code look like in order to get an idea how this sntp-timestamp looks like. How can I access the sntp-timestamp in order to set an external real-time clock. Up to now, the numbers I got don't make any sense and are also not in UNIX-timestamp format Thanks a lot, Verena

VerenaSchmidt11 · ‎10-30-2020

Hi, as already discussed previously BoschXDKCloudConnectivity doen't work currently due to changes in the protocoll to MQTT. It was also mentioned that in the next Workbench release a new example should be included which solves this problem. Is there a date / timeline when this new workbench is released? Thanks, Verena

VerenaSchmidt11 · ‎09-24-2020

Hi Francisco, thanks for your reply. However, as a novice to FFT I have no idea where to change the source code. My understanding so far is that the following function is looking for the frequency: void findHighestMagnitudeAndFrequency(float32_t* FFTmagnitudes, float32_t windowSize) { float32_t maxVal; uint32_t maxIndex; float32_t freqVal; float32_t samplingFrequency = 100; arm_max_f32(FFTmagnitudes, windowSize / 2, &maxVal, &maxIndex); float32_t freqBin = samplingFrequency/windowSize; freqVal = freqBin * maxIndex; printf("The maximal magnitude %f is at the frequency %f freqBin = %f maxIndex = %i \n\r",(float) maxVal, (float) freqVal, (float) freqBin, (int) maxIndex); } So far I understand this is that the function arm_max_f32 is looking for the frequency. &maxVal, &maxIndex are my return values. Therefore, I don't where I should change to index >= 1? Thanks a lot, Verena

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FFT Noise with XDK

Re: Mbedtls library on XDK

SNTP Timestamp

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Re: FFT Analysis for Noise

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