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feat(xiao): add Seeed XIAO STM32C5 board support
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‎boards.txt‎

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Original file line numberDiff line numberDiff line change
@@ -2482,6 +2482,96 @@ GenC0.menu.upload_method.OpenOCDDapLink.upload.tool=openocd_upload
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GenC0.menu.upload_method.OpenOCDDapLink.debug.server.openocd.scripts.0=interface/cmsis-dap.cfg
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GenC0.menu.upload_method.OpenOCDDapLink.debug.server.openocd.scripts.1={runtime.platform.path}/debugger/select_swd.cfg
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################################################################################
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# Seeed XIAO STM32C5
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XIAO_STM32C5.name=Seeed Studio
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XIAO_STM32C5.build.core=arduino
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XIAO_STM32C5.build.family=SEEED_STUDIO
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XIAO_STM32C5.build.board=XIAO_STM32C5
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XIAO_STM32C5.build.variant=STM32C5xx/C593C(E-G)(T-U)_C5A3CG(T-U)
2493+
XIAO_STM32C5.build.variant_h=variant_XIAO_STM32C5.h
2494+
XIAO_STM32C5.build.ldscript=ldscript_XIAO_STM32C5.ld
2495+
XIAO_STM32C5.build.st_extra_flags=-D{build.product_line} -DHSE_VALUE=48000000U -DUSBD_SELF_POWERED=1 -DUSBD_MAX_POWER=50 {build.enable_usb} {build.xSerial}
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XIAO_STM32C5.build.mcu=cortex-m33
2497+
XIAO_STM32C5.build.fpu=-mfpu=fpv5-sp-d16
2498+
XIAO_STM32C5.build.float-abi=-mfloat-abi=hard
2499+
XIAO_STM32C5.build.series=STM32C5xx
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XIAO_STM32C5.build.product_line=STM32C5A3xx
2501+
XIAO_STM32C5.build.hal=-DUSE_HALV2_DRIVER
2502+
XIAO_STM32C5.build.flash_offset=0x8000
2503+
XIAO_STM32C5.upload.maximum_size=1015808
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XIAO_STM32C5.upload.maximum_data_size=262144
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XIAO_STM32C5.upload.tool=uf2upload
2506+
XIAO_STM32C5.upload.protocol=serial
2507+
XIAO_STM32C5.upload.uf2.volume=XIAOC5BOOT
2508+
XIAO_STM32C5.upload.uf2.address=0x08008000
2509+
XIAO_STM32C5.upload.uf2.family=0x00C5C5C5
2510+
XIAO_STM32C5.upload.uf2.timeout=10000
2511+
XIAO_STM32C5.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32C5xx/STM32C5A3.svd
2512+
XIAO_STM32C5.vid.0=0x2886
2513+
XIAO_STM32C5.pid.0=0x80C5
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# Seeed XIAO STM32C5
2516+
XIAO_STM32C5.menu.pnum.XIAO_STM32C5=Seeed XIAO STM32C5
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XIAO_STM32C5.menu.pnum.XIAO_STM32C5.build.board=XIAO_STM32C5
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XIAO_STM32C5.menu.pnum.XIAO_STM32C5.build.product_line=STM32C5A3xx
2519+
XIAO_STM32C5.menu.pnum.XIAO_STM32C5.build.variant=STM32C5xx/C593C(E-G)(T-U)_C5A3CG(T-U)
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XIAO_STM32C5.menu.pnum.XIAO_STM32C5.build.variant_h=variant_XIAO_STM32C5.h
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XIAO_STM32C5.menu.pnum.XIAO_STM32C5.build.ldscript=ldscript_XIAO_STM32C5.ld
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XIAO_STM32C5.menu.pnum.XIAO_STM32C5.upload.maximum_size=1015808
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XIAO_STM32C5.menu.pnum.XIAO_STM32C5.upload.maximum_data_size=262144
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XIAO_STM32C5.menu.pnum.XIAO_STM32C5.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32C5xx/STM32C5A3.svd
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# U(S)ART support
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XIAO_STM32C5.menu.xserial.generic=Enabled (generic 'Serial')
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XIAO_STM32C5.menu.xserial.none=Enabled (no generic 'Serial')
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XIAO_STM32C5.menu.xserial.none.build.xSerial=-DHAL_UART_MODULE_ENABLED -DHWSERIAL_NONE
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XIAO_STM32C5.menu.xserial.disabled=Disabled (no Serial support)
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XIAO_STM32C5.menu.xserial.disabled.build.xSerial=
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# USB connectivity
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XIAO_STM32C5.menu.usb.none=None
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XIAO_STM32C5.menu.usb.CDCgen=CDC (generic 'Serial' supersede U(S)ART)
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XIAO_STM32C5.menu.usb.CDCgen.build.enable_usb={build.usb_flags} -DUSBD_USE_CDC
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XIAO_STM32C5.menu.usb.CDC=CDC (no generic 'Serial')
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XIAO_STM32C5.menu.usb.CDC.build.enable_usb={build.usb_flags} -DUSBD_USE_CDC -DDISABLE_GENERIC_SERIALUSB
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# Optimize
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XIAO_STM32C5.menu.opt.osstd=Smallest (-Os default)
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XIAO_STM32C5.menu.opt.oslto=Smallest (-Os) with LTO
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XIAO_STM32C5.menu.opt.oslto.build.flags.optimize=-Os -flto
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XIAO_STM32C5.menu.opt.o1std=Fast (-O1)
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XIAO_STM32C5.menu.opt.o1std.build.flags.optimize=-O1
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XIAO_STM32C5.menu.opt.o1lto=Fast (-O1) with LTO
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XIAO_STM32C5.menu.opt.o1lto.build.flags.optimize=-O1 -flto
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XIAO_STM32C5.menu.opt.o2std=Faster (-O2)
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XIAO_STM32C5.menu.opt.o2std.build.flags.optimize=-O2
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XIAO_STM32C5.menu.opt.o2lto=Faster (-O2) with LTO
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XIAO_STM32C5.menu.opt.o2lto.build.flags.optimize=-O2 -flto
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XIAO_STM32C5.menu.opt.o3std=Fastest (-O3)
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XIAO_STM32C5.menu.opt.o3std.build.flags.optimize=-O3
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XIAO_STM32C5.menu.opt.o3lto=Fastest (-O3) with LTO
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XIAO_STM32C5.menu.opt.o3lto.build.flags.optimize=-O3 -flto
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XIAO_STM32C5.menu.opt.ogstd=Debug (-Og)
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XIAO_STM32C5.menu.opt.ogstd.build.flags.optimize=-Og
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# Debug information
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XIAO_STM32C5.menu.dbg.none=None
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XIAO_STM32C5.menu.dbg.enable=Symbols Enabled (-g)
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XIAO_STM32C5.menu.dbg.enable.build.flags.debug=-g
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# C Runtime Library
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XIAO_STM32C5.menu.rtlib.nano=Newlib Nano (default)
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XIAO_STM32C5.menu.rtlib.nanofp=Newlib Nano + Float Printf
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XIAO_STM32C5.menu.rtlib.nanofp.build.flags.ldspecs=--specs=nano.specs -u _printf_float
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XIAO_STM32C5.menu.rtlib.nanofs=Newlib Nano + Float Scanf
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XIAO_STM32C5.menu.rtlib.nanofs.build.flags.ldspecs=--specs=nano.specs -u _scanf_float
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XIAO_STM32C5.menu.rtlib.nanofps=Newlib Nano + Float Printf/Scanf
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XIAO_STM32C5.menu.rtlib.nanofps.build.flags.ldspecs=--specs=nano.specs -u _printf_float -u _scanf_float
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XIAO_STM32C5.menu.rtlib.full=Newlib Standard
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XIAO_STM32C5.menu.rtlib.full.build.flags.ldspecs=
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################################################################################
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# Generic C5
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GenC5.name=Generic STM32C5 series

‎variants/STM32C5xx/C593C(E-G)(T-U)_C5A3CG(T-U)/ldscript_XIAO_STM32C5.ld‎

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/*
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* Copyright (c) 2026, Seeed Technology Co., Ltd.
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* The application starts after the 32 KiB TinyUF2 bootloader. Memory sizes are
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* supplied by boards.txt through LD_MAX_SIZE and LD_MAX_DATA_SIZE.
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*/
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ENTRY(Reset_Handler)
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HEAP_SIZE = 0x2000;
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STACK_SIZE = 0x2000;
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MEMORY
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{
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ROM (rx) : org = 0x08000000 + LD_FLASH_OFFSET, len = LD_MAX_SIZE - LD_FLASH_OFFSET
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/* TinyUF2 uses the final SRAM word for the 1200-bps reset handoff. */
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RAM (xrw) : org = 0x20000000, len = LD_MAX_DATA_SIZE - 4
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}
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SECTIONS
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{
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.vectors :
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{
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. = ALIGN(8);
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KEEP(*(.vectors));
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. = ALIGN(8);
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} > ROM
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.text :
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{
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. = ALIGN(8);
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*(.text);
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*(.text*);
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*(.glue_7);
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*(.glue_7t);
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*(.eh_frame);
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KEEP(*(.init));
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KEEP(*(.fini));
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. = ALIGN(8);
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_etext = .;
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} > ROM
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.rodata :
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{
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. = ALIGN(8);
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*(.rodata);
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*(.rodata*);
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. = ALIGN(8);
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} > ROM
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.ARM.extab (READONLY) :
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{
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. = ALIGN(8);
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*(.ARM.extab* .gnu.linkonce.armextab.*)
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. = ALIGN(8);
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} > ROM
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.ARM (READONLY) :
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{
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. = ALIGN(8);
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__exidx_start = .;
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*(.ARM.exidx*);
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__exidx_end = .;
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. = ALIGN(8);
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} > ROM
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.preinit_array (READONLY) :
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{
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. = ALIGN(8);
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PROVIDE_HIDDEN(__preinit_array_start = .);
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KEEP(*(.preinit_array*));
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PROVIDE_HIDDEN(__preinit_array_end = .);
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. = ALIGN(8);
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} > ROM
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.init_array (READONLY) :
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{
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. = ALIGN(8);
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PROVIDE_HIDDEN(__init_array_start = .);
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KEEP(*(SORT(.init_array.*)));
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KEEP(*(.init_array*));
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PROVIDE_HIDDEN(__init_array_end = .);
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. = ALIGN(8);
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} > ROM
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.fini_array (READONLY) :
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{
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. = ALIGN(8);
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PROVIDE_HIDDEN(__fini_array_start = .);
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KEEP(*(SORT(.fini_array.*)));
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KEEP(*(.fini_array*));
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PROVIDE_HIDDEN(__fini_array_end = .);
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. = ALIGN(8);
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} > ROM
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.copy.table (READONLY) :
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{
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. = ALIGN(8);
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__copy_table_start__ = .;
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LONG(LOADADDR(.data));
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LONG(ADDR(.data));
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LONG(SIZEOF(.data) / 4);
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__copy_table_end__ = .;
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} > ROM
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.zero.table (READONLY) :
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{
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. = ALIGN(8);
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__zero_table_start__ = .;
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LONG(ADDR(.bss));
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LONG(SIZEOF(.bss) / 4);
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__zero_table_end__ = .;
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} > ROM
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.data :
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{
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. = ALIGN(8);
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_sidata = LOADADDR(.data);
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__data_start__ = .;
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_sdata = .;
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*(.data);
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*(.data*);
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. = ALIGN(8);
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_edata = .;
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} > RAM AT> ROM
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.bss :
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{
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. = ALIGN(8);
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_sbss = .;
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__bss_start__ = _sbss;
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*(.bss);
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*(.bss*);
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*(COMMON);
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. = ALIGN(8);
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_ebss = .;
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__bss_end__ = _ebss;
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} > RAM
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.heap (NOLOAD) :
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{
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. = ALIGN(8);
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__end__ = .;
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PROVIDE(end = .);
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_heap_start = .;
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. += HEAP_SIZE;
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. = ALIGN(8);
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_heap_end = .;
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__HeapLimit = .;
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} > RAM
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.stack (NOLOAD) :
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{
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. = ALIGN(8);
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__StackLimit = .;
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. += STACK_SIZE;
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. = ALIGN(8);
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__StackTop = .;
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_estack = .;
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__stack = .;
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} > RAM
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/DISCARD/ :
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{
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libc.a(*);
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libm.a(*);
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libgcc.a(*);
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}
169+
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.ARM.attributes 0 :
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{
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*(.ARM.attributes)
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}
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}

‎variants/STM32C5xx/C593C(E-G)(T-U)_C5A3CG(T-U)/variant_XIAO_STM32C5.cpp‎

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/*
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* Copyright (c) 2026, Seeed Technology Co., Ltd.
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#if defined(ARDUINO_XIAO_STM32C5)
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#include "pins_arduino.h"
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const PinName digitalPin[] = {
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PA_0, // D0 / A0
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PA_1, // D1 / A1
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PA_2, // D2 / A2
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PA_3, // D3 / A3
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PB_7, // D4 / I2C1_SDA
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PB_6, // D5 / I2C1_SCL
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PA_9, // D6 / USART1_TX
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PA_10, // D7 / USART1_RX
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PE_2, // D8 / SPI3_SCK
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PB_0, // D9 / SPI3_MISO
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PB_15, // D10 / SPI3_MOSI
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PB_8, // D11 / FDCAN1_RX
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PB_9, // D12 / FDCAN1_TX
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PB_5, // D13 / FDCAN2_RX
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PB_13, // D14 / FDCAN2_TX
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PB_14, // D15 / CAN_STB
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PB_12, // Board LED, active low
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PB_3, // Onboard IMU / I2C2_SCL
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PB_4, // Onboard IMU / I2C2_SDA
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PC_13, // Onboard IMU / INT1
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PA_8 // Onboard IMU heater / TIM1_CH1
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};
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const pin_size_t analogInputPin[] = {
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D0,
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D1,
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D2,
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D3
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};
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/* TinyUF2 C5 (d52adcf) reserves the last SRAM word for the double-tap
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* handoff. The matching application linker script excludes this word from
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* the stack/heap RAM region. */
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static constexpr uintptr_t TINYUF2_HANDOFF_ADDRESS = 0x2003FFFCUL;
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static constexpr uint32_t TINYUF2_ENTER_DFU_MAGIC = 0xF01669EFUL;
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extern "C" void CDC_LineCodingChanged(uint32_t bitrate)
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{
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if (bitrate == 1200U) {
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*reinterpret_cast<volatile uint32_t *>(TINYUF2_HANDOFF_ADDRESS) = TINYUF2_ENTER_DFU_MAGIC;
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__DSB();
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__ISB();
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NVIC_SystemReset();
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while (true) {
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}
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}
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}
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extern "C" void SystemClock_Config(void)
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{
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if (HAL_RCC_HSE_Enable(HAL_RCC_HSE_ON) != HAL_OK) {
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Error_Handler();
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}
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hal_rcc_psi_config_t psi_config;
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psi_config.psi_source = HAL_RCC_PSI_SRC_HSE;
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psi_config.psi_ref = HAL_RCC_PSI_REF_48MHZ;
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psi_config.psi_out = HAL_RCC_PSI_OUT_144MHZ;
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if (HAL_RCC_PSI_SetConfig(&psi_config) != HAL_OK) {
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Error_Handler();
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}
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if (HAL_RCC_PSIS_Enable() != HAL_OK) {
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Error_Handler();
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}
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hal_rcc_bus_clk_config_t bus_config;
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bus_config.hclk_prescaler = HAL_RCC_HCLK_PRESCALER1;
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bus_config.pclk1_prescaler = HAL_RCC_PCLK_PRESCALER2;
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bus_config.pclk2_prescaler = HAL_RCC_PCLK_PRESCALER2;
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bus_config.pclk3_prescaler = HAL_RCC_PCLK_PRESCALER2;
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if (HAL_RCC_SetBusClockConfig(&bus_config) != HAL_OK) {
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Error_Handler();
82+
}
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HAL_FLASH_ITF_SetLatency(HAL_FLASH, HAL_FLASH_ITF_LATENCY_4);
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if (HAL_RCC_SetSYSCLKSource(HAL_RCC_SYSCLK_SRC_PSIS) != HAL_OK) {
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Error_Handler();
87+
}
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HAL_FLASH_ITF_SetProgrammingDelay(HAL_FLASH, HAL_FLASH_ITF_PROGRAM_DELAY_2);
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if (HAL_RCC_CK48_SetKernelClkSource(HAL_RCC_CK48_CLK_SRC_HSE) != HAL_OK) {
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Error_Handler();
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}
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if (HAL_UpdateCoreClock() != HAL_OK) {
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Error_Handler();
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}
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}
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void initVariant(void)
98+
{
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/* CAN_STB is active high. Keep the onboard transceiver out of standby. */
100+
pinMode(D15, OUTPUT);
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digitalWrite(D15, LOW);
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}
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#endif /* ARDUINO_XIAO_STM32C5 */

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