93 lines
2.1 KiB
NASM
93 lines
2.1 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2025 by Martin Preuss
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; email : martin@libchipcard.de
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;
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; ***************************************************************************
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; * This file is part of the project "AqHome". *
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; * Please see toplevel file COPYING of that project for license details. *
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; ***************************************************************************
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; ***************************************************************************
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; code
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.cseg
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BOOTLOADER_BEGIN:
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bootLoader:
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cli
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; setup stack
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.ifdef SPH ; if SPH is defined
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ldi r16, High(RAMEND)
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out SPH, r16 ; init MSB stack pointer
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.endif
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ldi r16, Low(RAMEND)
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out SPL, r16 ; init LSB stack pointer
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; start by setting all ports as inputs and enable internal pull-up resistors
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ldi r16, 0xff
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clr r17
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.ifdef PORTA
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out DDRA, r17 ; all input
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out PORTA, r16 ; enable pull-up on all
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.endif
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.ifdef PORTB
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out DDRB, r17 ; all input
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out PORTB, r16 ; enable pull-up on all
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.endif
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.ifdef PORTC
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out DDRC, r17 ; all input
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out PORTC, r16 ; enable pull-up on all
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.endif
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rcall systemSetSpeed
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; rcall watchdogOff ; turn off watchdog timer (sometimes it stays on after reboot)
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sbi LED_DDR, LED_PINNUM ; out
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cbi LED_PORT, LED_PINNUM ; on
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ldi r16, 30
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rcall flashWaitForMulti100ms
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rcall checkFlash ; (r16, r17, r18, r19, r20, r22, x, y, z)
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brcc bootLoader_startFirmware ; no flash process, try to start installed firmware
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rcall flashProcess ; received a FLASH START msg, handle flashing
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brcc bootLoader_waitAndRestartBootLoader
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; try to start firmware
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bootLoader_startFirmware:
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cbi LED_PORT, LED_PINNUM ; on
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rjmp firmwareStart
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bootLoader_waitAndRestartBootLoader:
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sbi LED_PORT, LED_PINNUM ; off
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ldi r16, 20
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rcall flashWaitForMulti100ms
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rjmp bootLoader
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bootClcRet:
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clc
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bootRet:
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ret
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bootSecRet:
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sec
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ret
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BOOTLOADER_END:
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.equ MODULE_SIZE_BOOTLOADER = BOOTLOADER_END-BOOTLOADER_BEGIN
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