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BLE Rx Improvements (#2710)

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* Work to allow for unique beacon parsing functions.
* Fix Copyright
* Update firmware/application/apps/ble_rx_app.cpp
* Update firmware/baseband/proc_btlerx.cpp
* PR suggestions.
* Fix String.
* Refactor
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Netro 2025-06-25 13:14:04 -04:00 • committed by GitHub
parent 22cc311447
commit d5ea0f0369
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8 changed files with 382 additions and 229 deletions
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20
firmware/common/utility.cpp
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@ -91,6 +91,26 @@ float mag2_to_dbv_norm(const float mag2) {
return (fast_log2(mag2) - mag2_log2_max) * mag2_to_db_factor;
}
// Function to calculate dBm and normalize based on LNA and VGA settings
float mag2_to_dbm_8bit_normalized(int8_t real, int8_t imag, float v_ref, float R) {
// Step 1: Normalize IQ values (convert 8-bit signed to -1.0 to +1.0)
float I = real / 127.0f; // Map the 8-bit real part to the [-1, 1] range
float Q = imag / 127.0f; // Map the 8-bit imaginary part to the [-1, 1] range
// Step 2: Compute the magnitude squared (I^2 + Q^2)
float mag2 = I * I + Q * Q;
// Step 3: Convert the magnitude squared to actual power (in watts)
float voltage_squared = mag2 * v_ref * v_ref;
float power_watts = voltage_squared / R;
// Step 4: Convert the power to dBm (multiply by 1000 to convert watts to milliwatts)
float power_milliwatts = power_watts * 1000.0f;
float dbm_measured = 10.0f * log10f(power_milliwatts);
return dbm_measured;
}
// Integer in and out approximation
// >40 times faster float sqrt(x*x+y*y) on Cortex M0
// derived from https://dspguru.com/dsp/tricks/magnitude-estimator/