193 lines
4.8 KiB
NASM
193 lines
4.8 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2023 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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.equ FLASH_ERROR_NONE = 0
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.equ FLASH_ERROR_MSGERROR = 1
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.equ FLASH_RECVBUFFER_MAXLEN = 128
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.equ FLASH_CMD_FLASH_RSP = 74
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.equ FLASH_MSG_OFFS_DESTADDR = 0
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.equ FLASH_MSG_OFFS_MSGLEN = 1
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.equ FLASH_MSG_OFFS_MSGDATA = 2
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.equ FLASH_MSG_OFFS_CMD = 2 ; first at COM2_MSG_OFFS_MSGDATA
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.equ FLASH_MSG_OFFS_SRCADDR = 3
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.equ FLASH_MSG_OFFS_PAYLOAD = 4 ; payload for the cmd follows here
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.equ FLASH_PACKET_DATA_OFFS_ADDR = FLASH_MSG_OFFS_PAYLOAD+0 ; 4 bytes
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.equ FLASH_PACKET_DATA_OFFS_DATA = FLASH_MSG_OFFS_PAYLOAD+4 ; n bytes
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.equ FLASH_PACKET_START_OFFS_UID = FLASH_MSG_OFFS_PAYLOAD+0 ; 4 bytes
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; ***************************************************************************
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; data
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.dseg
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flashDataBegin:
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flashUid: .byte 4
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flashSendBuffer: .byte 32
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flashRecvBuffer: .byte FLASH_RECVBUFFER_MAXLEN
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flashDataEnd:
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; ***************************************************************************
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; code
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.cseg
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FLASH_PROTO_BEGIN:
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bootLoader:
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cli ; disable interrupts throughout the whole process
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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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; rcall watchdogOff ; turn off watchdog timer (sometimes it stays on after reboot)
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; setup pins and interrupts
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cbi COM_PORT_DATA, COM_PINNUM_DATA ; disable internal pullup for DATA
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cbi COM_DDR_DATA, COM_PINNUM_DATA ; set DATA port as input
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cbi COM_PORT_ATTN, COM_PINNUM_ATTN ; disable internal pullup for ATTN
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cbi COM_DDR_ATTN, COM_PINNUM_ATTN ; set ATTN port as input
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sbi DDRA, PORTA3 ; out
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cbi PORTA, PORTA3 ; on
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cbi DDRA, PORTA2 ; in (debug led)
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sbi PORTA, PORTA2 ; pullup on (debug led)
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rcall flashReadUid
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sts flashUid, r18
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sts flashUid+1, r19
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sts flashUid+2, r20
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sts flashUid+3, r21
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; wait for 3 secs before doing anything else
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ldi r16, 30
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rcall flashWaitForMulti100ms
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rcall bootCheckFlash
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brcc bootLoader_startFirmware ; no flash process, try start installed firmware
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rcall bootLoaderFlash ; 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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sbi PORTA, PORTA3 ; LED off
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ldi r16, 20
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rcall flashWaitForMulti100ms
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rjmp firmwareStart
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bootLoader_waitAndRestartBootLoader:
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sbi PORTA, PORTA3 ; LED off
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ldi r16, 20
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rcall flashWaitForMulti100ms
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rjmp bootLoader
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; ---------------------------------------------------------------------------
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; check for incoming flash request
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;
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; send a FLASH_READY message and wait for about 10s for incoming FLASH_START which is then handled.
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;
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; IN:
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; - R16: message type to receive
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; - R17: wait time in 100ms (1=100ms, 2=200ms etc.)
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; OUT:
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; - CFLAG: set if incoming flash request received, cleared otherwise
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; - R16: message type received (if CFLAG set)
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; REGS: R16, R17, X (R1, R2, R18, R19, R20, R21, R22, R24, R25)
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bootCheckFlash:
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; send flash ready message
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ldi xl, LOW(flashSendBuffer)
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ldi xh, HIGH(flashSendBuffer)
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rcall flashWriteFlashReady ; (R16, R17, R18, R19, R20, Z)
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rcall flashSendPacketUntilSuccess ; (R16, R17, R18, R21, R22, R24, R25, X)
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bootCheckFlash_loop:
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; wait up to 10s for incoming FLASH_START message
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ldi r16, CPRO_CMD_FLASH_START
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ldi r17, 100 ; 100*100ms=10s
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rcall flashWaitForSpecificMessageWithLed ; R2, R16, R17 (R1, R24, R25, X)
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brcc bootRet
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; either FLASH_START or FLASH_END received
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cpi r16, CPRO_CMD_FLASH_START ; not FLASH_START, no flashing requested
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brne bootClcRet
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; received FLASH_START
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rcall flashHandleFlashStart
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brcc bootCheckFlash_loop
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ret ; ret with CARRY flag set
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bootLoaderFlash:
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bootLoaderFlash_loop1:
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; wait up to 10s for incoming FLASH_DATA message
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ldi r16, CPRO_CMD_FLASH_DATA
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ldi r17, 100 ; 100*100ms=10s
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rcall flashWaitForSpecificMessageWithLed
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brcc bootRet
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; either FLASH_DATA or FLASH_END received
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cpi r16, CPRO_CMD_FLASH_DATA ; not FLASH_DATA, flashing ended/aborted
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brne bootSecRet ; FLASH_END received, done
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; flash data
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rcall flashHandleFlashData
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rjmp bootLoaderFlash_loop1
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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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FLASH_PROTO_END:
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.equ MODULE_SIZE_FLASH_PROTO = FLASH_PROTO_END-FLASH_PROTO_BEGIN
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