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89 lines
2.1 KiB
89 lines
2.1 KiB
3 months ago
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/*
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* MODBUS Bootloader -- Protocol
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*
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* (c) 2023 Martin Mareš <mj@ucw.cz>
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*
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* Licensed under the GNU LGPL v3 or any later version.
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*/
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enum bl_input_reg {
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BL_INPUT_MAGIC_HI = 0xe000,
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BL_INPUT_MAGIC_LO,
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BL_INPUT_LOADER_VERSION,
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BL_INPUT_STATUS,
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// The following registers are not available in application mode
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BL_INPUT_VENDOR_ID,
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BL_INPUT_DEVICE_ID,
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BL_INPUT_SERIAL_NUMBER, // 12 characters as in USB
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BL_INPUT_BLOCK_SIZE = BL_INPUT_SERIAL_NUMBER + 6,
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BL_INPUT_FLASH_SIZE, // kB
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BL_INPUT_MAX,
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};
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enum bl_holding_reg {
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BL_HOLD_COMMAND = 0xe000,
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BL_HOLD_BLOCK_NUMBER,
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BL_HOLD_MAX,
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BL_HOLD_BLOCK_DATA = BL_HOLD_COMMAND + 0x100, // next BL_BLOCK_SIZE/2 registers contain block data
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};
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#define BL_MAGIC_HI 0x426f // "Bo"
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#define BL_MAGIC_LO 0x6f54 // "oT"
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#define BL_LOADER_VERSION 0x0001
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enum bl_status {
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BL_STATUS_APP = 1, // In application code, needs exit command
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BL_STATUS_READY, // Boot loader ready
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BL_STATUS_FLASHING, // Flashing in progress
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BL_STATUS_ERROR, // Error occurred
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BL_STATUS_CORRUPTED, // Corrupted firmware found
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BL_STATUS_BOOTING, // About to boot current firmware
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};
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enum bl_command {
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BL_COMMAND_BOOT = 1, // Boot current firmware
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BL_COMMAND_FLASH_START, // Enter flash mode
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BL_COMMAND_FLASH_END, // Quit flash mode and verify checksum
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BL_COMMAND_FLASH_BLOCK, // Flash one block
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BL_COMMAND_EXIT_APP, // Exit from application code to boot loader
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};
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static inline bool bl_app_check_input_register(u16 addr)
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{
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switch (addr) {
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case BL_INPUT_MAGIC_HI:
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case BL_INPUT_MAGIC_LO:
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case BL_INPUT_LOADER_VERSION:
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case BL_INPUT_STATUS:
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return true;
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default:
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return false;
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}
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}
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static inline u16 bl_app_get_input_register(u16 addr)
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{
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switch (addr) {
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case BL_INPUT_MAGIC_HI:
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return BL_MAGIC_HI;
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case BL_INPUT_MAGIC_LO:
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return BL_MAGIC_LO;
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case BL_INPUT_LOADER_VERSION:
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return BL_LOADER_VERSION;
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case BL_INPUT_STATUS:
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return BL_STATUS_APP;
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default:
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return 0;
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}
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}
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static inline bool bl_app_check_holding_register(u16 addr)
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{
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return (addr == BL_HOLD_COMMAND);
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}
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static inline bool bl_app_set_holding_register(u16 addr, u16 value)
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{
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return (addr == BL_HOLD_COMMAND && value == BL_COMMAND_EXIT_APP);
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}
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