Initial standalone sx126x driver WIP

code style changes and correct file path

initial file ops and initialization

sx126x board and driver integration

Squashed commit of the following:

commit 5c27c1e
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Tue Feb 18 20:57:14 2025 +0100

    syncword, crc and wl log

commit 30a8f0a
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Sun Feb 16 16:05:51 2025 +0100

    style changes

commit c950055
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Sun Feb 16 16:05:38 2025 +0100

    style changes and board support

commit 42b3574
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Sun Feb 16 12:40:41 2025 +0100

    payload receival

commit a116b03
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Sat Feb 15 20:07:14 2025 +0100

    Receiving test

commit 8f250dc
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Sat Feb 15 15:51:42 2025 +0100

    TX semaphore

commit 02d325e
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Sat Feb 15 14:53:19 2025 +0100

    irq status

commit 4d8a63f
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Sat Feb 15 13:58:41 2025 +0100

    initial interrupt handling

commit 4fae8c7
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Wed Feb 12 22:39:13 2025 +0100

    writing

commit 16184f7
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Tue Feb 11 21:10:35 2025 +0100

    initial nuttx integration for testing

commit d404cac
Merge: 3b38c20 3fb5506
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Tue Feb 11 19:44:41 2025 +0100

    Merge branch 'sx126x_lora_driver' of https://github.com/keever50/nuttx into sx126x_testing

commit 3b38c20
Author: Kevin Witteveen (MartiniMarter) <[email protected]>
Date:   Tue Feb 11 19:18:41 2025 +0100

    initial testing

commit 3fb5506
Author: keever50 <[email protected]>
Date:   Sun Feb 9 13:40:20 2025 +0100

    Initial standalone sx126x driver WIP

    code style changes and correct file path

    initial file ops and initialization

commit e51a9ad
Author: keever50 <[email protected]>
Date:   Sun Feb 9 13:38:56 2025 +0100

    Initial standlone driver

removal of board

style

drivers/wireless/lpwan/Kconfig

@@ -12,6 +12,15 @@ config LPWAN_SX127X
 	---help---
 		This options adds driver support for the Samtech SX127X chip.
 
+config LPWAN_SX126X
+	bool "SX126X Low Power Long Range transceiver support"
+	default n
+	select SPI
+	---help---
+		This options adds driver support for the Samtech SX126X chip.
+
+source "drivers/wireless/lpwan/sx126x/Kconfig"
+
 if LPWAN_SX127X
 
 config LPWAN_SX127X_RFFREQ_DEFAULT

drivers/wireless/lpwan/Make.defs

@@ -25,5 +25,6 @@
 ifeq ($(CONFIG_DRIVERS_LPWAN),y)
 
 include wireless/lpwan/sx127x/Make.defs
+include wireless/lpwan/sx126x/Make.defs
 
 endif # CONFIG_DRIVERS_LPWAN

drivers/wireless/lpwan/sx126x/CMakeLists.txt

@@ -0,0 +1,24 @@
+# ##############################################################################
+# drivers/wireless/lpwan/sx126x/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+if(CONFIG_LPWAN_SX126X)
+  target_sources(drivers PRIVATE sx126x.c)
+endif()

drivers/wireless/lpwan/sx126x/Kconfig

@@ -0,0 +1,28 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+if LPWAN_SX126X
+
+config LPWAN_SX126X_RFFREQ_DEFAULT
+	int "SX126X default RF frequency Hz"
+	default 869252000
+
+config LPWAN_SX126X_SF_DEFAULT
+	int "SX126X default spreading factor"
+	default 10
+
+config LPWAN_SX126X_BW_DEFAULT
+	int "SX126X default bandwidth kHz"
+	default 125
+
+config LPWAN_SX126X_CR_DEFAULT
+	int "SX126X default coding rate"
+	default 8
+
+config LPWAN_SX126X_MAX_DEVICES
+	int "SX126X maximum devices"
+	default 1
+
+endif # DRIVERS_LPWAN

drivers/wireless/lpwan/sx126x/Make.defs

@@ -0,0 +1,35 @@
+############################################################################
+# drivers/wireless/lpwan/sx126x/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+# Include SX126X drivers into the build
+
+ifeq ($(CONFIG_LPWAN_SX126X),y)
+
+CSRCS += sx126x.c
+
+# Include SX126X build support
+
+DEPPATH += --dep-path wireless$(DELIM)lpwan$(DELIM)sx126x
+VPATH += :wireless$(DELIM)lpwan$(DELIM)sx126x
+CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)drivers$(DELIM)wireless$(DELIM)lpwan$(DELIM)sx126x
+
+endif # CONFIG_LPWAN_SX126X