de52b57041
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.
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
#ifndef UF2FORMAT_H
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#define UF2FORMAT_H 1
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#include <stdint.h>
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#include <stdbool.h>
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// All entries are little endian.
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// if you increase that, you will also need to update the linker script file
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#ifdef SAMD21
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#define APP_START_ADDRESS 0x00002000
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#define UF2_FAMILY 0x68ed2b88
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#endif
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#ifdef SAMD51
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#define APP_START_ADDRESS 0x00004000
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#define UF2_FAMILY 0x55114460
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#endif
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#define UF2_MAGIC_START0 0x0A324655UL // "UF2\n"
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#define UF2_MAGIC_START1 0x9E5D5157UL // Randomly selected
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#define UF2_MAGIC_END 0x0AB16F30UL // Ditto
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// If set, the block is "comment" and should not be flashed to the device
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#define UF2_FLAG_NOFLASH 0x00000001
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#define UF2_FLAG_FAMILYID_PRESENT 0x00002000
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#define UF2_IS_MY_FAMILY(bl) \
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(((bl)->flags & UF2_FLAG_FAMILYID_PRESENT) == 0 || (bl)->familyID == UF2_FAMILY)
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typedef struct {
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// 32 byte header
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uint32_t magicStart0;
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uint32_t magicStart1;
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uint32_t flags;
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uint32_t targetAddr;
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uint32_t payloadSize;
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uint32_t blockNo;
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uint32_t numBlocks;
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uint32_t familyID;
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// raw data;
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uint8_t data[476];
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// store magic also at the end to limit damage from partial block reads
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uint32_t magicEnd;
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} UF2_Block;
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typedef struct {
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uint8_t version;
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uint8_t ep_in;
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uint8_t ep_out;
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uint8_t reserved0;
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uint32_t cbw_tag;
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uint32_t blocks_remaining;
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uint8_t *buffer;
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} UF2_HandoverArgs;
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typedef void (*UF2_MSC_Handover_Handler)(UF2_HandoverArgs *handover);
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typedef void (*UF2_HID_Handover_Handler)(int ep);
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// this is required to be exactly 16 bytes long by the linker script
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typedef struct {
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const uint32_t *config_data;
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UF2_HID_Handover_Handler handoverHID;
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UF2_MSC_Handover_Handler handoverMSC;
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const char *info_uf2;
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} UF2_BInfo;
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#define UF2_BINFO ((UF2_BInfo *)(APP_START_ADDRESS - sizeof(UF2_BInfo)))
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static inline bool is_uf2_block(void *data) {
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UF2_Block *bl = (UF2_Block *)data;
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return bl->magicStart0 == UF2_MAGIC_START0 && bl->magicStart1 == UF2_MAGIC_START1 &&
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bl->magicEnd == UF2_MAGIC_END;
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}
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static inline bool in_uf2_bootloader_space(const void *addr) {
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return 0xb4 <= (uint32_t)addr && (uint32_t)addr < APP_START_ADDRESS;
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}
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static inline const char *uf2_info(void) {
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if (in_uf2_bootloader_space(UF2_BINFO->info_uf2))
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return UF2_BINFO->info_uf2;
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return "N/A";
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}
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#ifdef UF2_DEFINE_HANDOVER
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static inline void hf2_handover(uint8_t ep) {
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const char *board_info = UF2_BINFO->info_uf2;
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UF2_HID_Handover_Handler fn = UF2_BINFO->handoverHID;
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if (in_uf2_bootloader_space(board_info) && in_uf2_bootloader_space((const void *)fn) &&
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((uint32_t)fn & 1)) {
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// Pass control to bootloader; never returns
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fn(ep & 0xf);
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}
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}
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// the ep_in/ep_out are without the 0x80 mask
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// cbw_tag is in the same bit format as it came
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static inline void check_uf2_handover(uint8_t *buffer, uint32_t blocks_remaining, uint8_t ep_in,
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uint8_t ep_out, uint32_t cbw_tag) {
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if (!is_uf2_block(buffer))
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return;
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const char *board_info = UF2_BINFO->info_uf2;
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UF2_MSC_Handover_Handler fn = UF2_BINFO->handoverMSC;
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if (in_uf2_bootloader_space(board_info) && in_uf2_bootloader_space((const void *)fn) &&
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((uint32_t)fn & 1)) {
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UF2_HandoverArgs hand = {
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1, ep_in, ep_out, 0, cbw_tag, blocks_remaining, buffer,
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};
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// Pass control to bootloader; never returns
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fn(&hand);
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}
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}
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#endif
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#endif
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