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perf(v5e): SX1262 SPI 125 kHz -> 4 MHz + TCXO wakeup 10 -> 5 ms (1.72x downlink) #476

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perf(v5e): SX1262 SPI 125 kHz -> 4 MHz + TCXO wakeup 10 -> 5 ms (1.72x downlink) #476

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17 changes: 12 additions & 5 deletions ...nco_space/proves_flight_control_board_v5e/proves_flight_control_board_v5e_rp2350a_m33.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -55,9 +55,12 @@
* in-tree Zephyr lora driver (semtech,sx1262) from
* claiming this device. LORA_BASICS_MODEM_DRIVERS
* depends on !LORA so exactly one driver binds.
* spi-max-frequency: kept at 125000 Hz from the GRC bring-up value;
* may be a board-level SPI signal-integrity workaround
* (kept from v5e bring-up; revisit before production).
* spi-max-frequency: 4 MHz (SX1262 max 16 MHz). The 125 kHz
* bring-up value cost ~18 ms of SPI time per TX frame
* (HWIL 2026-07-24: onPreTx config+FIFO upload 31 ms
* at 125 kHz vs 12 ms at 4 MHz); validated on the HIL
* bench with bidirectional P4_GFSK_75K link + 178 KB
* file downlink (byte-identical, 1.53x throughput).
* tx/rx-enable-gpios: USP upstream has no external RF-switch support;
* carried via our patch (spikes/patches/0001-feat-…).
* dio3-as-tcxo-control + tcxo-voltage: replaces dio3-tcxo-voltage in
Expand All @@ -68,13 +71,17 @@
lora0_usp: sx1262_usp@0 {
compatible = "semtech,sx1262-new";
reg = <0>;
spi-max-frequency = <125000>; /* kept from v5e bring-up; revisit */
spi-max-frequency = <4000000>; /* was 125000 (bring-up); HWIL-validated 2026-07-24 */
reset-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
busy-gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
dio1-gpios = <&gpio0 14 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
dio3-as-tcxo-control;
tcxo-voltage = <SX126X_TCXO_SUPPLY_1_8V>;
tcxo-wakeup-time = <10>;
tcxo-wakeup-time = <5>; /* was 10; radio planner sleeps the radio after every
* TX task, so this delay is paid per frame. 5 ms
* HWIL-validated 2026-07-24 (link + file integrity);
* confirm against the E22-400M30S TCXO startup spec
* before flight. */
reg-mode = <SX126X_REG_MODE_LDO>;
rx-boosted;
tx-enable-gpios = <&gpio0 21 GPIO_ACTIVE_HIGH>;
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