Support AVR32 builds on macOS

.github/workflows/avr32-build.yml

@@ -0,0 +1,60 @@
+name: AVR32 firmware build
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+env:
+  TOOLCHAIN_REPO: cozycactus/avr32-toolchain-macos-arm64
+  TOOLCHAIN_TAG: v2026.06.03
+  TOOLCHAIN_ARCHIVE: avr32-tools-src-macos-arm64-20260603.tar.gz
+  ATMEL_HEADERS_VERSION: 6.1.3.1475
+
+jobs:
+  avr32:
+    name: Build SDR Widget with avr32-gcc
+    runs-on: macos-26
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Install host dependencies
+        run: brew install libusb
+
+      - name: Download AVR32 toolchain
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh release download "$TOOLCHAIN_TAG" \
+            --repo "$TOOLCHAIN_REPO" \
+            --pattern "$TOOLCHAIN_ARCHIVE" \
+            --pattern "$TOOLCHAIN_ARCHIVE.sha256"
+          expected="$(awk '{print $1}' "$TOOLCHAIN_ARCHIVE.sha256")"
+          actual="$(shasum -a 256 "$TOOLCHAIN_ARCHIVE" | awk '{print $1}')"
+          test "$actual" = "$expected"
+          mkdir -p toolchain
+          tar -xzf "$TOOLCHAIN_ARCHIVE" -C toolchain
+
+      - name: Download Atmel headers
+        run: |
+          toolchain_root="$PWD/toolchain/avr32-tools-src"
+          headers_zip="atmel-headers-${ATMEL_HEADERS_VERSION}.zip"
+          mkdir -p "$toolchain_root/downloads" "$toolchain_root/atmel-headers"
+          curl -L \
+            "https://ww1.microchip.com/downloads/archive/${headers_zip}" \
+            -o "$toolchain_root/downloads/${headers_zip}"
+          unzip -q -o "$toolchain_root/downloads/${headers_zip}" \
+            -d "$toolchain_root/atmel-headers"
+
+      - name: Build firmware and host control tool
+        run: |
+          toolchain_root="$PWD/toolchain/avr32-tools-src"
+          export PATH="$toolchain_root/bin:$PATH"
+          avr32-gcc --version
+          make clean
+          make all AVR32_TOOLCHAIN="$toolchain_root"

Makefile

@@ -5,6 +5,13 @@
 ##
 ## assumes that you've set the AVR32BIN environment
 ## to point to the directory containing avr32-gcc
+HOST_CC ?= gcc
+PKG_CONFIG ?= pkg-config
+LIBUSB_CFLAGS ?= $(shell $(PKG_CONFIG) --variable=includedir libusb-1.0 2>/dev/null | sed 's|^|-I|')
+LIBUSB_LIBS ?= $(shell $(PKG_CONFIG) --libs libusb-1.0 2>/dev/null || echo -lusb-1.0)
+HOST_CFLAGS ?=
+HOST_LDFLAGS ?=
+
 all:: Release/widget.elf widget-control
 
 Release/widget.elf::
@@ -19,7 +26,7 @@ sdr-widget::
 	CFLAGS=-DFEATURE_DEFAULT_BOARD=feature_board_widget ./make-widget
 
 widget-control: widget-control.c src/features.h
-	gcc -o widget-control widget-control.c -lusb-1.0
+	$(HOST_CC) $(HOST_CFLAGS) $(LIBUSB_CFLAGS) -o widget-control widget-control.c $(HOST_LDFLAGS) $(LIBUSB_LIBS)
 
 clean::
 	cd Release && make clean

makefile.defs

@@ -0,0 +1,20 @@
+# Local build settings. This file is included by Release/makefile.
+AVR32_TOOLCHAIN ?=
+
+ifeq ($(strip $(ATMEL_HEADERS)),)
+ifneq ($(strip $(AVR32_TOOLCHAIN)),)
+ATMEL_HEADERS := $(firstword $(wildcard $(AVR32_TOOLCHAIN)/atmel-headers/atmel-headers-*))
+endif
+endif
+
+ifneq ($(strip $(ATMEL_HEADERS)),)
+CFLAGS += -I$(ATMEL_HEADERS)
+ASFLAGS += -I$(ATMEL_HEADERS)
+export CPATH := $(ATMEL_HEADERS):$(CPATH)
+endif
+
+OBJS += ./src/newlib_compat.o
+
+src/newlib_compat.o: ../src/newlib_compat.c
+	@echo Compile $(CFLAGS) $<
+	@avr32-gcc $(CFLAGS) -O2 -fdata-sections -Wall -c -fmessage-length=0 -ffunction-sections -o"$@" "$<"

src/newlib_compat.c

@@ -0,0 +1,5 @@
+int _isatty(int file)
+{
+	(void)file;
+	return 0;
+}

widget-control.c

@@ -39,6 +39,8 @@ const char usage[] = {
 
 int verbose = 0;
 
+int finish(int return_value);
+
 /*
 ** features
 */
@@ -123,7 +125,7 @@ int find_feature_value(int index, char *value) {
 char *usb_serial_id = NULL;
 libusb_device_handle *usb_handle;
 char *usb_device = "none";
-char usb_data[1024];
+unsigned char usb_data[1024];
 unsigned int usb_timeout = 2000;
 
 
@@ -188,13 +190,15 @@ libusb_device_handle *find_device(int list_all) {
 				libusb_close(h);
 				continue;
 			}
-			unsigned char serialId[1024];
-			if ((status = libusb_get_string_descriptor_ascii(h, desc.iSerialNumber, serialId, sizeof(serialId))) <= 0) {
-				if (verbose)
-					if (status == 0)
+			char serialId[1024];
+			if ((status = libusb_get_string_descriptor_ascii(h, desc.iSerialNumber, (unsigned char *)serialId, sizeof(serialId))) <= 0) {
+				if (verbose) {
+					if (status == 0) {
 						fprintf(stderr, "find_device: libusb_get_string_descriptor_ascii(%04x:%04x, ...) returned 0 bytes", desc.idVendor, desc.idProduct);
-					else
+					} else {
 						fprintf(stderr, "find_device: libusb_get_string_descriptor_ascii(%04x:%04x, ...) failed: %s", desc.idVendor, desc.idProduct, error_string(status));
+					}
+				}
 				libusb_release_interface(h, 0);
 				libusb_close(h);
 				continue;
@@ -430,7 +434,11 @@ int set_nvram(int argc, char *argv[]) {
 		fprintf(stderr, "widget-control: wrong number (%d) of features specified, should be %d features to set\n", argc, true_feature_end_index);
 		exit(1);
 	}
-	features = (uint8_t *)calloc(true_feature_major_index, sizeof(uint8_t));
+	features = (uint8_t *)calloc(true_feature_end_index, sizeof(uint8_t));
+	if (features == NULL) {
+		fprintf(stderr, "widget-control: unable to allocate feature values\n");
+		exit(finish(1));
+	}
 	for (i = true_feature_minor_index+1; i < true_feature_end_index; i += 1) {
 		j = find_feature_value(i, argv[i]);
 		if (j >= first_value(i) && j <= last_value(i)) {