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Add UF2 bootloader for USB firmware flashing

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Vendored and trimmed from microsoft/uf2-samdx1, adapted to the actual
ATSAMD21G17D (128 KiB flash / 16 KiB RAM), fixing the flash/RAM-size
mismatch that the previously commented-out SAM-BA bootloader target
had (it assumed a 256 KiB SAMD21G18A). Builds as a standalone
PlatformIO environment (bootloader/platformio.ini), no python2/make
dependency. Compiles clean, fits in the 8 KiB bootloader region
(7292/8192 bytes). Not yet flashed/verified on real hardware.
This commit is contained in:
cjjohn 2026-08-03 20:56:58 +02:00
parent ce5db617a1
commit de52b57041
143 changed files with 69119 additions and 0 deletions
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44
bootloader/lib/samd21/samd21a/include/instance/pac1.h Normal file
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/**
* \file
*
* \brief Instance description for PAC1
*
* Copyright (c) 2016 Atmel Corporation,
* a wholly owned subsidiary of Microchip Technology Inc.
*
* \asf_license_start
*
* \page License
*
* Licensed 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 Licence 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.
*
* \asf_license_stop
*
*/
#ifndef _SAMD21_PAC1_INSTANCE_
#define _SAMD21_PAC1_INSTANCE_
/* ========== Register definition for PAC1 peripheral ========== */
#if (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__))
#define REG_PAC1_WPCLR (0x41000000) /**< \brief (PAC1) Write Protection Clear */
#define REG_PAC1_WPSET (0x41000004) /**< \brief (PAC1) Write Protection Set */
#else
#define REG_PAC1_WPCLR (*(RwReg *)0x41000000UL) /**< \brief (PAC1) Write Protection Clear */
#define REG_PAC1_WPSET (*(RwReg *)0x41000004UL) /**< \brief (PAC1) Write Protection Set */
#endif /* (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__)) */
/* ========== Instance parameters for PAC1 peripheral ========== */
#define PAC1_WPROT_DEFAULT_VAL 0x00000002 // PAC protection mask at reset
#endif /* _SAMD21_PAC1_INSTANCE_ */