Add UF2 bootloader for USB firmware flashing
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.
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cjjohn
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bootloader/lib/samd21/samd21a/include/instance/tc7.h
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bootloader/lib/samd21/samd21a/include/instance/tc7.h
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/**
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* \file
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*
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* \brief Instance description for TC7
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*
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* Copyright (c) 2016 Atmel Corporation,
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* a wholly owned subsidiary of Microchip Technology Inc.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the Licence at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* \asf_license_stop
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*
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*/
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#ifndef _SAMD21_TC7_INSTANCE_
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#define _SAMD21_TC7_INSTANCE_
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/* ========== Register definition for TC7 peripheral ========== */
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#if (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__))
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#define REG_TC7_CTRLA (0x42003C00) /**< \brief (TC7) Control A */
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#define REG_TC7_READREQ (0x42003C02) /**< \brief (TC7) Read Request */
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#define REG_TC7_CTRLBCLR (0x42003C04) /**< \brief (TC7) Control B Clear */
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#define REG_TC7_CTRLBSET (0x42003C05) /**< \brief (TC7) Control B Set */
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#define REG_TC7_CTRLC (0x42003C06) /**< \brief (TC7) Control C */
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#define REG_TC7_DBGCTRL (0x42003C08) /**< \brief (TC7) Debug Control */
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#define REG_TC7_EVCTRL (0x42003C0A) /**< \brief (TC7) Event Control */
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#define REG_TC7_INTENCLR (0x42003C0C) /**< \brief (TC7) Interrupt Enable Clear */
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#define REG_TC7_INTENSET (0x42003C0D) /**< \brief (TC7) Interrupt Enable Set */
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#define REG_TC7_INTFLAG (0x42003C0E) /**< \brief (TC7) Interrupt Flag Status and Clear */
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#define REG_TC7_STATUS (0x42003C0F) /**< \brief (TC7) Status */
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#define REG_TC7_COUNT16_COUNT (0x42003C10) /**< \brief (TC7) COUNT16 Counter Value */
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#define REG_TC7_COUNT16_CC0 (0x42003C18) /**< \brief (TC7) COUNT16 Compare/Capture 0 */
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#define REG_TC7_COUNT16_CC1 (0x42003C1A) /**< \brief (TC7) COUNT16 Compare/Capture 1 */
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#define REG_TC7_COUNT32_COUNT (0x42003C10) /**< \brief (TC7) COUNT32 Counter Value */
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#define REG_TC7_COUNT32_CC0 (0x42003C18) /**< \brief (TC7) COUNT32 Compare/Capture 0 */
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#define REG_TC7_COUNT32_CC1 (0x42003C1C) /**< \brief (TC7) COUNT32 Compare/Capture 1 */
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#define REG_TC7_COUNT8_COUNT (0x42003C10) /**< \brief (TC7) COUNT8 Counter Value */
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#define REG_TC7_COUNT8_PER (0x42003C14) /**< \brief (TC7) COUNT8 Period Value */
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#define REG_TC7_COUNT8_CC0 (0x42003C18) /**< \brief (TC7) COUNT8 Compare/Capture 0 */
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#define REG_TC7_COUNT8_CC1 (0x42003C19) /**< \brief (TC7) COUNT8 Compare/Capture 1 */
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#else
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#define REG_TC7_CTRLA (*(RwReg16*)0x42003C00UL) /**< \brief (TC7) Control A */
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#define REG_TC7_READREQ (*(RwReg16*)0x42003C02UL) /**< \brief (TC7) Read Request */
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#define REG_TC7_CTRLBCLR (*(RwReg8 *)0x42003C04UL) /**< \brief (TC7) Control B Clear */
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#define REG_TC7_CTRLBSET (*(RwReg8 *)0x42003C05UL) /**< \brief (TC7) Control B Set */
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#define REG_TC7_CTRLC (*(RwReg8 *)0x42003C06UL) /**< \brief (TC7) Control C */
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#define REG_TC7_DBGCTRL (*(RwReg8 *)0x42003C08UL) /**< \brief (TC7) Debug Control */
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#define REG_TC7_EVCTRL (*(RwReg16*)0x42003C0AUL) /**< \brief (TC7) Event Control */
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#define REG_TC7_INTENCLR (*(RwReg8 *)0x42003C0CUL) /**< \brief (TC7) Interrupt Enable Clear */
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#define REG_TC7_INTENSET (*(RwReg8 *)0x42003C0DUL) /**< \brief (TC7) Interrupt Enable Set */
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#define REG_TC7_INTFLAG (*(RwReg8 *)0x42003C0EUL) /**< \brief (TC7) Interrupt Flag Status and Clear */
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#define REG_TC7_STATUS (*(RoReg8 *)0x42003C0FUL) /**< \brief (TC7) Status */
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#define REG_TC7_COUNT16_COUNT (*(RwReg16*)0x42003C10UL) /**< \brief (TC7) COUNT16 Counter Value */
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#define REG_TC7_COUNT16_CC0 (*(RwReg16*)0x42003C18UL) /**< \brief (TC7) COUNT16 Compare/Capture 0 */
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#define REG_TC7_COUNT16_CC1 (*(RwReg16*)0x42003C1AUL) /**< \brief (TC7) COUNT16 Compare/Capture 1 */
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#define REG_TC7_COUNT32_COUNT (*(RwReg *)0x42003C10UL) /**< \brief (TC7) COUNT32 Counter Value */
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#define REG_TC7_COUNT32_CC0 (*(RwReg *)0x42003C18UL) /**< \brief (TC7) COUNT32 Compare/Capture 0 */
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#define REG_TC7_COUNT32_CC1 (*(RwReg *)0x42003C1CUL) /**< \brief (TC7) COUNT32 Compare/Capture 1 */
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#define REG_TC7_COUNT8_COUNT (*(RwReg8 *)0x42003C10UL) /**< \brief (TC7) COUNT8 Counter Value */
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#define REG_TC7_COUNT8_PER (*(RwReg8 *)0x42003C14UL) /**< \brief (TC7) COUNT8 Period Value */
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#define REG_TC7_COUNT8_CC0 (*(RwReg8 *)0x42003C18UL) /**< \brief (TC7) COUNT8 Compare/Capture 0 */
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#define REG_TC7_COUNT8_CC1 (*(RwReg8 *)0x42003C19UL) /**< \brief (TC7) COUNT8 Compare/Capture 1 */
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#endif /* (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__)) */
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/* ========== Instance parameters for TC7 peripheral ========== */
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#define TC7_CC8_NUM 2 // Number of 8-bit Counters
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#define TC7_CC16_NUM 2 // Number of 16-bit Counters
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#define TC7_CC32_NUM 2 // Number of 32-bit Counters
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#define TC7_DITHERING_EXT 0 // Dithering feature implemented
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#define TC7_DMAC_ID_MC_0 37
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#define TC7_DMAC_ID_MC_1 38
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#define TC7_DMAC_ID_MC_LSB 37
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#define TC7_DMAC_ID_MC_MSB 38
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#define TC7_DMAC_ID_MC_SIZE 2
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#define TC7_DMAC_ID_OVF 36 // Indexes of DMA Overflow trigger
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#define TC7_GCLK_ID 29 // Index of Generic Clock
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#define TC7_MASTER 0
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#define TC7_OW_NUM 2 // Number of Output Waveforms
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#define TC7_PERIOD_EXT 0 // Period feature implemented
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#define TC7_SHADOW_EXT 0 // Shadow feature implemented
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#endif /* _SAMD21_TC7_INSTANCE_ */
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