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Clarify BK4829 REG_43 docs and keep stock AM/W/N behavior coherent
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Armel FAUVEAU committed
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@@ -603,100 +603,91 @@ void BK4819_EnableVox(uint16_t VoxEnableThreshold, uint16_t VoxDisableThreshold)
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void BK4819_SetFilterBandwidth(const BK4819_FilterBandwidth_t Bandwidth, const bool weak_no_different)
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{
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// REG_43
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// <15> 0 ???
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(void)weak_no_different;
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// REG_43 on BK4829, per BK4829 Registers Table.
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//
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// <14:12> 4 RF filter bandwidth
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// 0 = 1.7 kHz
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// 1 = 2.0 kHz
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// 2 = 2.5 kHz
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// 3 = 3.0 kHz
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// 4 = 3.75 kHz
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// 5 = 4.0 kHz
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// 6 = 4.25 kHz
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// 7 = 4.5 kHz
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// if <5> == 1, RF filter bandwidth * 2
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// <14:12> RF filter bandwidth (Apass = 0.1dB)
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// 000 = 2.0 kHz
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// 001 = 2.5 kHz
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// 010 = 3.0 kHz
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// 011 = 3.5 kHz
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// 100 = 4.0 kHz
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// 101 = 4.5 kHz
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// 110 = 5.0 kHz
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// 111 = 5.5 kHz
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// if REG_43<5> == 1, RF filter bandwidth *= 2
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//
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// <11:9> 0 RF filter bandwidth when signal is weak
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// 0 = 1.7 kHz
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// 1 = 2.0 kHz
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// 2 = 2.5 kHz
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// 3 = 3.0 kHz
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// 4 = 3.75 kHz
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// 5 = 4.0 kHz
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// 6 = 4.25 kHz
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// 7 = 4.5 kHz
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// if <5> == 1, RF filter bandwidth * 2
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// <11:9> RF filter bandwidth when signal is weak (Apass = 0.1dB)
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// 000 = 2.0 kHz
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// 001 = 2.5 kHz
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// 010 = 3.0 kHz
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// 011 = 3.5 kHz
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// 100 = 4.0 kHz
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// 101 = 4.5 kHz
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// 110 = 5.0 kHz
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// 111 = 5.5 kHz
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// if REG_43<5> == 1, RF filter bandwidth *= 2
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//
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// <8:6> 1 AFTxLPF2 filter Band Width
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// 1 = 2.5 kHz (for 12.5k channel space)
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// 2 = 2.75 kHz
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// 0 = 3.0 kHz (for 25k channel space)
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// 3 = 3.5 kHz
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// 4 = 4.5 kHz
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// 5 = 4.25 kHz
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// 6 = 4.0 kHz
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// 7 = 3.75 kHz
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// <8:6> AF Tx LPF2 filter bandwidth (Apass = 1dB)
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// 100 = 5.5 kHz
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// 101 = 5.0 kHz
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// 110 = 4.5 kHz
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// 111 = 4.0 kHz
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// 000 = 3.0 kHz
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// 001 = 2.5 kHz
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// 010 = 2.75 kHz
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// 011 = 3.5 kHz
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//
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// <5:4> 0 BW Mode Selection
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// 0 = 12.5k
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// 1 = 6.25k
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// 2 = 25k/20k
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// <5:4> BW mode selection
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// 00 = 12.5k
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// 01 = 6.25k
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// 10 = 25k/20k
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//
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// <3> 1 ???
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// <2> gain after FM demodulation
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// 0 = 0 dB
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// 1 = 6 dB
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//
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// <2> 0 Gain after FM Demodulation
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// 0 = 0dB
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// 1 = 6dB
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//
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// <1:0> 0 ???
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// <3> and <1:0> remain undocumented here.
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uint16_t val = 0;
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switch (Bandwidth)
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{
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case BK4819_FILTER_BW_WIDE: // 25kHz
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// if (weak_no_different) {
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// // make the RX bandwidth the same with weak signals
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// val = 0x3628; // Old value 0x49a8 < v3.6
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// } else {
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// // with weak RX signals the RX bandwidth is reduced
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// val = 0x3428; // Old value 0x45a8 < v3.6
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// }
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// 0x3028 = (0b011 << 12) | (0b000 << 9) | (0b000 << 6) |
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// (0b10 << 4) | (1 << 3)
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// = RF 3.5 kHz and weak-RF 2.0 kHz, both doubled because
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// bit<5> is set in 25k/20k mode => RF 7.0 kHz, weak-RF
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// 4.0 kHz, AF Tx LPF2 3.0 kHz, FM gain 0 dB.
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val = 0x3028;
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break;
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case BK4819_FILTER_BW_NARROW: // 12.5kHz
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// if (weak_no_different) {
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// // make the RX bandwidth the same with weak signals
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// val = 0x3648; // Old value 0x4808 < v3.6
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// } else {
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// // with weak RX signals the RX bandwidth is reduced
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// val = 0x3448; // Old value 0x4408 < v3.6
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// }
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// 0x4048 = (0b100 << 12) | (0b000 << 9) | (0b001 << 6) |
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// (0b00 << 4) | (1 << 3)
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// = RF 4.0 kHz, weak-RF 2.0 kHz, AF Tx LPF2 2.5 kHz,
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// 12.5k mode, FM gain 0 dB.
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val = 0x4048;
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break;
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case BK4819_FILTER_BW_NARROWER: // 6.25kHz
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// if (weak_no_different) {
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// // make the RX bandwidth the same with weak signals
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// val = 0x1348; // Old value 0x3658 < v3.6
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// } else {
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// // with weak RX signals the RX bandwidth is reduced
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// val = 0x1148; // Old value 0x3658 < v3.6
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// }
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// 0x205C = (0b010 << 12) | (0b000 << 9) | (0b001 << 6) |
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// (0b01 << 4) | (1 << 3) | (1 << 2)
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// = RF 3.0 kHz, weak-RF 2.0 kHz, AF Tx LPF2 2.5 kHz,
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// 6.25k mode, FM gain +6 dB.
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val = 0x205C;
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break;
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case BK4819_FILTER_BW_AM: // 8.33kHz
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// if (weak_no_different) {
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// // make the RX bandwidth the same with weak signals
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// val = 0x4858;
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// } else {
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// // with weak RX signals the RX bandwidth is reduced
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// val = 0x4458;
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// }
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case BK4819_FILTER_BW_AM: // Stock AM preset
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// 0x345C = (0b011 << 12) | (0b010 << 9) | (0b001 << 6) |
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// (0b01 << 4) | (1 << 3) | (1 << 2)
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// = RF 3.5 kHz, weak-RF 3.0 kHz, AF Tx LPF2 2.5 kHz,
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// 6.25k mode, bit<2> set. The "8.33kHz AM" label used in
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// the codebase is functional/empirical; it does not come
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// directly from the BW mode bits of REG_43.
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val = 0x345C;
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break;
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default:
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val = 0x5C;
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break;
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