150 lines
4.4 KiB
NASM
150 lines
4.4 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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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; wait for a specific message to arrive within given time, flashing LED
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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 msg received (either expected msg or FLASH_END), cleared otherwise
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; - R16: message type received (if CFLAG set)
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; REGS: R2, R16, R17 (R1, R24, R25, X)
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flashWaitForSpecificMessageWithLed:
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mov r2, r16
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sbi LED_PORT, LED_PINNUM ; off
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flashWaitForSpecificMessageWithLed_loop:
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sbi LED_PIN, LED_PINNUM ; toggle
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mov r16, r2
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push r17
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ldi r17, 100 ; wait up to 100ms
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rcall flashWaitForSpecificMessage ; (R1, R16, R17, R24, R25, X)
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pop r17
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brcs flashWaitForSpecificMessageWithLed_received
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dec r17
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brne flashWaitForSpecificMessageWithLed_loop
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sbi LED_PORT, LED_PINNUM ; off
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rjmp flash_recv_clc_ret ; timeout
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flashWaitForSpecificMessageWithLed_received:
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sbi LED_PORT, LED_PINNUM ; off
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rjmp flash_recv_sec_ret
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; ---------------------------------------------------------------------------
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; wait for a specific message to arrive within given time.
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;
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; IN:
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; - R16: msg command to wait for
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; - R17: time to wait for packet (in milliseconds)
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; OUT:
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; - CFLAG: set if msg received, cleared on timeout
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; - R16 : message type received
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; REGS: R1, R16, R17, X (R24, R25)
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flashWaitForSpecificMessage:
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mov r1, r16 ; expected message type
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flashWaitForSpecificMessage_loop0:
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; wait for ATTN to go low
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flashWaitForSpecificMessage_loop1:
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ldi r16, 0 ; wait for low
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rcall flashWaitForAttnState1ms ; (R22, R24)
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brcs flashWaitForSpecificMessage_isLow
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dec r17
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brne flashWaitForSpecificMessage_loop1
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rjmp flash_recv_clc_ret ; timeout
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; receive message
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flashWaitForSpecificMessage_isLow: ; is low, receive message, check for msg type
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push r17
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ldi r16, COM2_MAINTENANCE_ADDR
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ldi r17, FLASH_RECVBUFFER_MAXLEN-3
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ldi xl, LOW(flashRecvBuffer)
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ldi xh, HIGH(flashRecvBuffer)
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rcall com2ReceivePacketRaw
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pop r17
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brcc flashWaitForSpecificMessage_waitAttnHigh
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ldi xl, LOW(flashRecvBuffer)
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ldi xh, HIGH(flashRecvBuffer)
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adiw xh:xl, COM2_MSG_OFFS_CMD
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ld r16, X
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sbiw xh:xl, COM2_MSG_OFFS_CMD
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cp r16, r1
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breq flashWaitForSpecificMessage_received
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cpi r16, CPRO_CMD_FLASH_END
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breq flashWaitForSpecificMessage_received
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flashWaitForSpecificMessage_waitAttnHigh:
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dec r17
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breq flash_recv_clc_ret
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; wait for ATTN to go high
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flashWaitForSpecificMessage_loop2:
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ldi r16, 0xff ; wait for high
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rcall flashWaitForAttnState1ms ; (R22, R24)
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brcs flashWaitForSpecificMessage_isHigh
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dec r17
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brne flashWaitForSpecificMessage_loop2
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rjmp flash_recv_clc_ret ; timeout
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flashWaitForSpecificMessage_isHigh:
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rjmp flashWaitForSpecificMessage_loop0
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flashWaitForSpecificMessage_received: ; R16 contains message type
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rjmp flash_recv_sec_ret
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; ---------------------------------------------------------------------------
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; Wait for up to 1ms for ATTN line to reach the given state
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;
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; IN:
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; - R16: expected state (0xff for high, 0 for low)
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; OUT:
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; - CFLAG: set if state reached, cleared otherwise
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; REGS: R24 (R22)
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flashWaitForAttnState1ms:
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ldi r24, 100
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flashWaitForAttnState1ms_loop:
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push r17
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in r17, COM_PIN_ATTN
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eor r17, r16
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andi r17, (1<<COM_PINNUM_ATTN)
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pop r17
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breq flashWaitForAttnState1ms_stateReached
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rcall Utils_WaitFor10MicroSecs ; wait for 10us (R22)
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dec r24
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brne flashWaitForAttnState1ms_loop
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rjmp flash_recv_clc_ret
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flashWaitForAttnState1ms_stateReached:
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rjmp flash_recv_sec_ret
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flash_recv_clc_ret:
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clc
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ret
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flash_recv_sec_ret:
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sec
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ret
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