Use 8 MHz buffered radio SPI on RAK3401

test/test_rak3401_buffered_radio_hal.py

@@ -60,7 +60,7 @@ struct Module {
   Module(ArduinoHal* adapter, unsigned cs, unsigned irq, unsigned rst, unsigned busy)
       : hal(adapter) {
     assert(cs==1 && irq==2 && rst==3 && busy==4);
-    assert(hal->spi == &SPI1 && hal->spiSettings.hz == 2000000);
+    assert(hal->spi == &SPI1 && hal->spiSettings.hz == 8000000);
   }
 };
 struct Radio {
@@ -97,7 +97,7 @@ int main() {
 
 
 class Rak3401BufferedRadioHalTests(unittest.TestCase):
-    def test_actual_target_uses_one_transfer_per_command_on_same_2mhz_spi1(self):
+    def test_actual_target_uses_one_transfer_per_command_on_same_spi1_at_8mhz(self):
         target = (ROOT / "variants/rak3401/target.cpp").read_text(encoding="ascii")
         construction = "\n".join(re.findall(
             r"^(?:static Nrf52BufferedRadioHal radioHal\([^;]+;|"

test/test_rak3401_onboard_radio.py

@@ -471,7 +471,7 @@ class Rak3401OnboardRadioTests(unittest.TestCase):
         self.assertIn("P_LORA_RESET, P_LORA_BUSY, SPI)", target)
         # External-radio construction and retry must retain their SPI1 owner.
         external_target = (VARIANT / "target.cpp").read_text()
-        self.assertIn("Nrf52BufferedRadioHal radioHal(SPI1, 2000000)", external_target)
+        self.assertIn("Nrf52BufferedRadioHal radioHal(SPI1, 8000000)", external_target)
         self.assertIn("new Module(&radioHal, P_LORA_NSS, P_LORA_DIO_1, "
                       "P_LORA_RESET, P_LORA_BUSY)", external_target)
         external_init = extract_braced(external_target, "bool radio_init()")

variants/rak3401/target.cpp

@@ -126,9 +126,9 @@ RAK3401Board board;
 // controller instance for startup and watchdog recovery; resetting the radio
 // must not replace or tear down the SPI object used by its Module.
 // Batch each RadioLib command into one SPIM transfer rather than starting a
-// transfer per byte. Retain the existing 2 MHz clock and RadioLib's BUSY,
+// transfer per byte. Use the SPI1-supported 8 MHz clock and retain RadioLib's BUSY,
 // chip-select, command status, and IRQ handling.
-static Nrf52BufferedRadioHal radioHal(SPI1, 2000000);
+static Nrf52BufferedRadioHal radioHal(SPI1, 8000000);
 RADIO_CLASS radio = new Module(&radioHal, P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY);
 
 WRAPPER_CLASS radio_driver(radio, board);