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Text: float rfm_freq_trim = 0.068f; uint8_t freqbuf[3]; long _freq; void rfm69_set_frequency(float freqMHz) { _freq = (long)(((freqMHz + rfm_freq_trim) * 1000000) / 61.04f); // 32MHz / 2^19 = 61.04 Hz freqbuf[0] = (_freq >> 16) & 0xff; freqbuf[1] = (_freq >> 8) & 0xff; freqbuf[2] = _freq & 0xff; #ifdef HAVE_HWSERIAL0 Serial.print(F("Setting frequency to: ")); Serial.print(freqMHz, DEC); Serial.print(F("MHz = 0x")); Serial.println(_freq, HEX); Serial.flush(); _rf69_burst_write(RFM69_REG_07_FRF_MSB, freqbuf, 3); _rf69_burst_read(RFM69_REG_07_FRF_MSB, freqbuf, 3); _freq = (freqbuf[0] << 16) | (freqbuf[1] << 8) | freqbuf[2]; Serial.print(F("Frequency was set to: ")); Serial.print((float)_freq / 1000000 * 61.04f, DEC); Serial.print(F("MHz = 0x")); Serial.println(_freq, HEX); Serial.flush(); #endif }