feat(kiss): add dual-profile radio2 support for OpenHop

variants/heltec_v4/platformio.ini

@@ -847,6 +847,14 @@ build_unflags =
 build_flags =
   ${Heltec_lora32_v4.build_flags}
   -DARDUINO_USB_MODE=1
+  ; KISS radio2 scanning stays on the board. This narrowly opts this target
+  ; into the guarded SX1262 RX-to-RX fast path and buffered 8 MHz SPI.  The
+  ; host-powered modem also uses the established V4 160 MHz role override;
+  ; normal V4 images retain their lower-power 80 MHz policy.
+  -D MC_SX1262_FAST_PROFILE_SWITCH=1
+  -D MC_SX1262_BUFFERED_RADIO_HAL=1
+  -D MC_SX1262_SPI_HZ=8000000
+  -D ESP32_CPU_FREQ=160
 build_src_filter = ${Heltec_lora32_v4.build_src_filter}
   +<../examples/kiss_modem/>
 

variants/heltec_v4/target.cpp

@@ -1,11 +1,22 @@
 #include <Arduino.h>
 #include "target.h"
 
+// Normal V4 images retain the established RadioLib Arduino HAL.  The KISS
+// modem can opt into buffered SPI for its on-board dual-profile RX scanner.
+#if defined(MC_SX1262_BUFFERED_RADIO_HAL) && MC_SX1262_BUFFERED_RADIO_HAL
+  #include <helpers/radiolib/ESP32BufferedRadioHal.h>
+#endif
+
 HeltecV4Board board;
 
 #if defined(P_LORA_SCLK)
   static SPIClass spi;
-  RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, spi);
+  #if defined(MC_SX1262_BUFFERED_RADIO_HAL) && MC_SX1262_BUFFERED_RADIO_HAL
+    static ESP32BufferedRadioHal radio_hal(spi);
+    RADIO_CLASS radio = new Module(&radio_hal, P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY);
+  #else
+    RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, spi);
+  #endif
 #else
   RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY);
 #endif