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PRALINE Tx and clock fix (Pr 3192 takeover (#3198) )

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* fix clock init and add mayhem tx capacity
* aligned external clock and RX config
* fix(clock): cap TX interpolation to x16 to prevent doubled waveform speed

  The TX gateware only implements interpolation factors x1..x16 (tx_intrp
  0..4), but the rate search could select n==5 (x32) for very low TX
  sample rates. That left the AFE/CLK0/CLK1 running at the x32 rate while
  the FPGA only interpolated by x16, clocking the TX datapath at twice the
  gateware output rate. Cap afe_rate and _resampling_n to the x16 limit in
  TX so the clocks stay aligned with the interpolation setting.

* fix(praline): source PLL1 from 40MHz GP_CLKIN instead of 12MHz XTAL

  For the intermediate 90-110MHz PLL1 stepping stage, source PLL1 from
  GP_CLKIN (Si5351 CLK2/MCU_CLK at 40MHz) giving N=2, M=10, Fclk=100MHz,
  rather than the on-chip 12MHz XTAL bootstrap path. This matches the
  non-PRALINE path. Remove the dead commented-out XTAL enable/PLL code.

* docs(fpga_bridge): correct register 0x03 description for PRALINE gateware

  Register 0x03 is RX_DIGITAL_GAIN in RX and TX_NCO_CTRL in TX, not
  RX_PSTEP.

* Fix fpga_tx_set_nco_enable to use FPGA_REG3_TX_NCO_CTRL (0x03)
This commit is contained in:
gullradriel
2026-05-31 12:44:40 +02:00
committed by GitHub
parent 4e56d0f420
commit 8f5b25b10d
11 changed files with 241 additions and 201 deletions
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firmware/application/rf_path.cpp
+7 -2
View File
@@ -263,6 +263,11 @@ void Path::set_rf_amp(const bool new_rf_amp) {
update();
}
void Path::set_antenna_bias(const bool new_antenna_bias) {
antenna_bias = new_antenna_bias;
update();
}
void Path::update() {
/* 0 ^ 0 => 0 & 0 = 0 ^ 0 = 0 (no change)
* 0 ^ 1 => 1 & 0 = 0 ^ 0 = 0 (ignore change to 1)
@@ -301,8 +306,8 @@ void Path::update() {
/* RF amp when amplification requested */
config.rf_amp_en = rf_amp;
/* Antenna bias off by default */
config.ant_bias_en_n = true;
/* Preserve requested antenna bias state across band/direction/amp updates. */
config.ant_bias_en_n = !antenna_bias;
config.apply();