Radio: collapse the buffered-SPI guard to one macro

RADIO_SPI_BULK_ACTIVE only ever restated RADIO_SPI_BULK plus the
architecture check, so the two tracked each other and the boot log needed
a three-term condition to say anything. Default RADIO_SPI_BULK to 1 on
Portduino instead, and the one macro guards everything.

Setting it on an architecture with no buffered call used to be silently
ignored; it is now an #error that names the reason.

Builds verified: tracker-t1000-e off and on, tbeam-s3-core on, rak4631
on, native, and the #error confirmed firing on senselora_rp2040.

src/mesh/RadioLibInterface.cpp

@@ -32,7 +32,7 @@ void LockingArduinoHal::spiEndTransaction()
     spiLock->unlock();
 }
 
-#if RADIO_SPI_BULK_ACTIVE
+#if RADIO_SPI_BULK
 void LockingArduinoHal::spiTransfer(uint8_t *out, size_t len, uint8_t *in)
 {
 #if defined(ARDUINO_ARCH_ESP32)
@@ -49,7 +49,7 @@ RadioLibInterface::RadioLibInterface(LockingArduinoHal *hal, RADIOLIB_PIN_TYPE c
 {
     instance = this;
 
-#if RADIO_SPI_BULK && RADIO_SPI_BULK_ACTIVE && !ARCH_PORTDUINO
+#if RADIO_SPI_BULK && !ARCH_PORTDUINO
     LOG_INFO("RADIO_SPI_BULK: one SPI transfer per radio command");
 #endif
 

src/mesh/RadioLibInterface.h

@@ -36,15 +36,18 @@
 #define AGC_FORCED_RESET_MS (24 * 60 * 60 * 1000UL)
 #endif
 
-// 1 = move each radio command as one buffered SPI transfer on nRF52 and ESP32, as Portduino already does, instead of
-// RadioLib's one SPI.transfer() call per byte. Off by default pending wider soak.
+// 1 = send each radio command as one buffered SPI transfer, instead of RadioLib's one
+// SPI.transfer() call per byte. Portduino has always done this; nRF52 and ESP32 can opt in, and no
+// other architecture has a buffered call to use. Off by default there pending a wider soak.
 #ifndef RADIO_SPI_BULK
+#if ARCH_PORTDUINO
+#define RADIO_SPI_BULK 1
+#else
 #define RADIO_SPI_BULK 0
 #endif
-#if ARCH_PORTDUINO || (RADIO_SPI_BULK && (defined(ARDUINO_NRF52_ADAFRUIT) || defined(ARDUINO_ARCH_ESP32)))
-#define RADIO_SPI_BULK_ACTIVE 1
-#else
-#define RADIO_SPI_BULK_ACTIVE 0
+#endif
+#if RADIO_SPI_BULK && !(ARCH_PORTDUINO || defined(ARDUINO_NRF52_ADAFRUIT) || defined(ARDUINO_ARCH_ESP32))
+#error "RADIO_SPI_BULK: no buffered SPI call on this architecture"
 #endif
 
 /**
@@ -57,7 +60,7 @@ class LockingArduinoHal : public ArduinoHal
 
     void spiBeginTransaction() override;
     void spiEndTransaction() override;
-#if RADIO_SPI_BULK_ACTIVE
+#if RADIO_SPI_BULK
     void spiTransfer(uint8_t *out, size_t len, uint8_t *in) override;
 
 #endif