Initial import

app/Kconfig

@@ -0,0 +1,71 @@
+mainmenu "LoRa KISS Modem Configuration"
+
+source "Kconfig.zephyr"
+
+menu "KISS Interface"
+
+config LORAMODEM_KISS_IFACE_USB
+	bool "Use USB CDC-ACM as KISS serial interface"
+	depends on USB_DEVICE_STACK || USB_DEVICE_STACK_NEXT
+	help
+	  Use USB CDC-ACM virtual serial port for the KISS interface.
+	  Requires the host to enumerate the device before framing begins.
+	  The board overlay must define the loramodem,kiss-uart chosen node
+	  pointing to a cdc_acm_uart instance.
+
+config LORAMODEM_KISS_IFACE_UART
+	bool "Use hardware UART as KISS serial interface"
+	default y if !LORAMODEM_KISS_IFACE_USB
+	help
+	  Use a hardware UART for the KISS interface.
+	  The board overlay must define the loramodem,kiss-uart chosen node
+	  pointing to the desired uart instance.
+
+endmenu
+
+menu "LoRa Radio Parameters"
+
+config LORAMODEM_LORA_FREQ_HZ
+	int "Center frequency (Hz)"
+	default 915000000
+	help
+	  LoRa radio center frequency in Hz.
+	  Common values: 915000000 (US/AU), 868000000 (EU), 433000000 (Asia).
+
+config LORAMODEM_LORA_SF
+	int "Spreading factor"
+	default 9
+	range 7 12
+	help
+	  LoRa spreading factor. Higher values increase range and time-on-air.
+
+config LORAMODEM_LORA_BW
+	int "Bandwidth (kHz)"
+	default 125
+	help
+	  LoRa bandwidth in kHz. Valid values: 125, 250, 500.
+
+config LORAMODEM_LORA_CR
+	int "Coding rate denominator"
+	default 5
+	range 5 8
+	help
+	  LoRa coding rate as the denominator N of 4/N.
+	  5 = 4/5 (lowest overhead), 8 = 4/8 (highest redundancy).
+
+config LORAMODEM_LORA_TX_POWER_DBM
+	int "TX power (dBm)"
+	default 14
+	range 2 22
+
+config LORAMODEM_LORA_PREAMBLE_LEN
+	int "Preamble length (symbols)"
+	default 8
+	range 6 65535
+
+endmenu
+
+config LORAMODEM_MAX_PACKET_SIZE
+	int "Maximum LoRa packet payload size (bytes)"
+	default 255
+	range 1 255