added a more compact uart module.
This commit is contained in:
Martin Preuss
592
avr/modules/flash/io_uart_attn_small.asm
Normal file
592
avr/modules/flash/io_uart_attn_small.asm
Normal file
@@ -0,0 +1,592 @@
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; ***************************************************************************
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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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; ---------------------------------------------------------------------------
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; @routine ioRawInit
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; Send a message
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;
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; @clobbers r16, r17
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ioRawInit:
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; set baudrate
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.if clock == 8000000
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ldi r16, 25 ; (19.2Kb/s at 8MHz)
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ldi r17, 0
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.endif
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.if clock == 1000000
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ldi r16, 3 ; (19.2Kb/s at 1MHz)
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ldi r17, 0
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.endif
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outr UART_REG_UBRRH, r17
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outr UART_REG_UBRRL, r16
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; set character format (asynchronous USART, 8-bit, one stop bit, no parity)
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.ifdef URSEL
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ldi r16, (1<<URSEL) | (1<<UART_BIT_USBS) | (3<<UART_BIT_UCSZ0)
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.else
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ldi r16, (1<<UART_BIT_USBS)|(3<<UART_BIT_UCSZ0)
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.endif
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; ldi r16, (1<<UART_BIT_UCSZ0) | (1<<UART_BIT_UCSZ1)
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outr UART_REG_UCSRC, r16
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cbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN port as input
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.ifdef COM_ATTN_PUE
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inr r16, COM_ATTN_PUE
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cbr r16, COM_ATTN_PIN ; disable pullup on ATTN
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outr COM_ATTN_PUE, r16
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.else
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cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; disable internal pullup for ATTN
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.endif
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ret
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;@end
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; ---------------------------------------------------------------------------
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; @routine ioRawSendMsg
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; Send a message
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;
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; @clobbers r16, r17, X
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ioRawSendMsg:
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ldi xl, LOW(flashSendBuffer)
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ldi xh, HIGH(flashSendBuffer)
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rcall ioRawSendMsgWithAttn
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brcc ioRawSendMsg
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawSendMsgWithAttn
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;
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; @param X buffer to send
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; @return CFLAG: set if okay (packet sent), cleared on error
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; @clobbers r16, r17 (X)
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ioRawSendMsgWithAttn:
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cbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN as input
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nop
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ldi r16, 0xff ; wait for ATTN high
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ldi r20, 2 ; 2s
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rcall ioRawWaitForAttnSeconds
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brcc ioRawSendMsgWithAttn_ret
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sbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN as output
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cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; set ATTN low
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rcall ioRawWaitForOneBitLength ; wait for one bit duration (R22)
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rcall ioRawWaitForOneBitLength ; wait for one bit duration (R22)
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rcall ioRawSendMsgHandleTransceiver ; (r16, r17, X)
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cbi COM_ATTN_DDR, COM_ATTN_PIN ; release ATTN line (by setting direction to IN)
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ioRawSendMsgWithAttn_ret:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawSendMsgHandleTransceiver
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; Enable transceiver, send packet, disable transceiver.
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;
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; @param X buffer to send
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; @return CFLAG: set if okay (packet sent), cleared on error
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; @clobbers r16 (r17, X)
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ioRawSendMsgHandleTransceiver:
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; enable transceiver
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inr r16, UART_REG_UCSRB
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sbr r16,(1<<UART_BIT_TXEN) ; enable transmit
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outr UART_REG_UCSRB, r16
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rcall ioRawSendMsgDirect
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; disable transceiver
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inr r16, UART_REG_UCSRB
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cbr r16,(1<<UART_BIT_TXEN) ; disable transmit
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outr UART_REG_UCSRB, r16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawSendMsgDirect
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; Send packet.
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;
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; @param X buffer to send
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; @return CFLAG: set if okay (packet sent), cleared on error
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; @clobbers r16, r17, X
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ioRawSendMsgDirect:
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adiw xh:xl, 1
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ld r17, X ; read msg size
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sbiw xh:xl, 1
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ldi r16, 3 ; add DEST, LEN, CRC bytes
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add r17, r16
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ioRawSendMsgDirect_loop:
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; wait until transceiver ready
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inr r16, UART_REG_UCSRA
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sbrs r16, UART_BIT_UDRE
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rjmp ioRawSendMsgDirect_loop
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; clear TXC flag by sending a 1
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sbr r16, (1<<UART_BIT_TXC)
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outr UART_REG_UCSRA, r16
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; write byte to uart data register
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ld r16, X+
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outr UART_REG_UDR, r16
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dec r17
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brne ioRawSendMsgDirect_loop
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; wait until all data send (i.e. send buffer empty and all bits shifted out)
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ioRawSendMsgDirect_loopComplete:
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inr r16, UART_REG_UCSRA
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sbrs r16, UART_BIT_TXC
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rjmp ioRawSendMsgDirect_loopComplete
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sec
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawWaitForValidMsg
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; Wait for valid incoming msg
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;
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; @return CFLAG set if okay (packet received), cleared on error
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; @clobbers: r16, r17, r18 (r19, r22, X)
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ioRawWaitForValidMsg:
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; ATTN handling
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cbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN as input
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nop
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ldi r16, 0xff ; wait for ATTN high
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ldi r20, 2 ; 2s
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rcall ioRawWaitForAttnSeconds
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brcc ioRawSendMsgWithAttn_ret
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ldi r16, 0x00 ; wait for ATTN low
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ldi r20, 10 ; 10s
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rcall ioRawWaitForAttnSeconds
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brcc ioRawSendMsgWithAttn_ret
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; actual receiption
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ldi xl, LOW(flashRecvBuffer)
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ldi xh, HIGH(flashRecvBuffer)
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ldi r18, FLASH_RECVBUFFER_MAXLEN-3 ; maximum accepted msglen byte
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rcall ioRecvMsgHandleReceiver ; (r16, r17, r18, r19, r20, r22)
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brcs ioRawWaitForValidMsg_packetReceived
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; ATTN handling again
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ldi r16, 0xff ; wait for ATTN high
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ldi r20, 10 ; 5s
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rcall ioRawWaitForAttnSeconds
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clc
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ret
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ioRawWaitForValidMsg_packetReceived:
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; ATTN handling again
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ldi r16, 0xff ; wait for ATTN high
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ldi r20, 10 ; 5s
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rcall ioRawWaitForAttnSeconds
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brcc ioRawWaitForValidMsg_end
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ldi xl, LOW(flashRecvBuffer)
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ldi xh, HIGH(flashRecvBuffer)
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rcall NETMSG_CheckMessageInBuffer
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ioRawWaitForValidMsg_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRecvMsgHandleReceiver
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;
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; Turn receiver on, receive message, turn receiver off.
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; @return CFLAG set if okay, cleared on error
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; @param r18 max accepted msglen size (buffersize-3)
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; @param X buffer to receive to
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; @clobbers r16 (r17, r18, r19, r20, r22)
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ioRecvMsgHandleReceiver:
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; enable receiver
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inr r16, UART_REG_UCSRB
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sbr r16,(1<<UART_BIT_RXEN) ; enable receive
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outr UART_REG_UCSRB, r16
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rcall ioRecvMsg
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inr r16, UART_REG_UCSRB
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cbr r16,(1<<UART_BIT_RXEN) ; disable receive
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outr UART_REG_UCSRB, r16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRecvMsg
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;
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; Wait for next message, if received check validity.
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; On error skip the currently received message.
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;
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; @return CFLAG set if okay, cleared on error
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; @param r18 max accepted msglen size (buffersize-3)
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; @param R20 max number of secs to wait for incoming message
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; @param X buffer to receive to
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; @clobbers (r16, r17, r18, r19, r20, r22)
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ioRecvMsg:
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rcall ioRawRecvMsg ; (r16, r17, r18, r19, r20, r22)
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brcc ioRecvMsg_error
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push xl
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push xh
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rcall NETMSG_CheckMessageInBuffer ; (R16, R17, R18, R19, R20, X)
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pop xh
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pop xl
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brcs ioRecvMsg_end
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ioRecvMsg_error:
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; rcall ioRecvSkipMessage ; skip remainder of the message
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clc
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ioRecvMsg_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawRecvMsg
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;
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; @return CFLAG set if okay, cleared on error
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; @param r18 max accepted msglen size (buffersize-3)
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; @param X buffer to receive to
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; @clobbers r16, r17, r19 (r18, r20, r22)
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ioRawRecvMsg:
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inr r19, UART_REG_UCSRA
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cbr r19, (1<<UART_BIT_FE) | (1<<UART_BIT_DOR) | (1<<UART_BIT_UPE)
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outr UART_REG_UCSRA, r19 ; clear errors
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; wait for begin of message
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rcall ioRawWaitForData1s ; (r20, r22)
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brcc ioRawRecvMsg_end
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clr r19 ; bytecounter
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; read first two bytes
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ldi r17, 2 ; 2 bytes: address byte, msg len
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add r19, r17
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rcall ioRawRecvBytes ; (r16, r17, r20, r22)
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brcc ioRawRecvMsg_error
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cp r16, r18 ; check size
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brcc ioRawRecvMsg_error
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inc r16 ; account for checksum byte
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; read remaining bytes including checksum byte
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mov r17, r16
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add r19, r17
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rcall ioRawRecvBytes ; (r16, r17, r18, r22)
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brcc ioRawRecvMsg_error
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sub xl, r19 ; let X point back to begin of message
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sbc xh, r19
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add xh, r19
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sec
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ret
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ioRawRecvMsg_error:
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clc
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ioRawRecvMsg_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawRecvBytes
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;
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; @return CFLAG set if okay (data available), cleared on error
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; @return r16 last byte received
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; @param r17 number of bytes to read
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; @param x buffer to receive to
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; @clobbers r16, r17 (r20, r22)
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ioRawRecvBytes:
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rcall ioRawRecvByteWithin10ms ; (r20, r22)
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brcc ioRawRecvBytes_end
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st X+, r16
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dec r17
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brne ioRawRecvBytes
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sec
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ioRawRecvBytes_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawRecvByteWithin10ms
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;
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; Wait up to 10ms for incoming byte and read it.
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;
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; @return CFLAG set if okay (data available), cleared on error
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; @return r16 byte received (if CFLAG set)
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; @clobbers: r20, r22
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ioRawRecvByteWithin10ms:
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rcall ioRawWaitForData10ms ; (R20, R22)
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brcc ioRawRecvByteWithin10ms_end
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inr r16, UART_REG_UCSRA ; check for errors
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andi r16, (1<<UART_BIT_FE) | (1<<UART_BIT_DOR) | (1<<UART_BIT_UPE)
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brne ioRawRecvByteWithin10ms_error
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inr r16, UART_REG_UDR ; read data byte
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sec
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ret
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ioRawRecvByteWithin10ms_error:
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clc
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ioRawRecvByteWithin10ms_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawWaitForDataSeconds
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;
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; Wait for incoming data for max given seconds
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;
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; @return CFLAG set if okay (data available), cleared on error
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; @param r20 maximum number of seconds to wait
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; @clobbers: r20, r22
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ioRawWaitForDataSeconds:
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ioRawWaitForDataSeconds_loop:
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push r20
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rcall ioRawWaitForData1s ; (r20, r22)
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pop r20
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brcs ioRawWaitForDataSeconds_gotit
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sbi LED_PIN, LED_PINNUM ; toggle (doen't work on AtMega8515)
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dec r20
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brne ioRawWaitForDataSeconds_loop
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clc
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ioRawWaitForDataSeconds_gotit:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawWaitForData1s
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;
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; Wait for incoming data for max 1s
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;
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; @return CFLAG set if okay (data available), cleared on error
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; @clobbers: r20, r22
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ioRawWaitForData1s:
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ldi r20, 100
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ioRawWaitForData1s_loop:
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push r20
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rcall ioRawWaitForData10ms ; (R20, R22)
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pop r20
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brcs ioRawWaitForData1s_gotit
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dec r20
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brne ioRawWaitForData1s_loop
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clc
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ioRawWaitForData1s_gotit:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawWaitForData10ms
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;
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; Wait for incoming data for max 10 milliseconds.
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;
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; @return CFLAG set if okay (data available), cleared on error
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; @clobbers: r20, r22
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ioRawWaitForData10ms:
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.if clock == 8000000
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ldi r20, 80
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.endif
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.if clock == 1000000
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ldi r20, 10
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.endif
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ioRawWaitForData10ms_loop:
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push r20
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rcall ioRawWaitForData1000Cycles ; (r20, r22)
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pop r20
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brcs ioRawWaitForData10ms_gotit
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dec r20
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brne ioRawWaitForData10ms_loop
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clc
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ioRawWaitForData10ms_gotit:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawWaitForData1000Cycles
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;
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; Wait for incoming data for max 1000 clock cycles
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; (about 1ms at 1MHz, 0.125ms at 8MHz)
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;
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; @return CFLAG set if okay (packet received), cleared on error
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; @clobbers: r20, r22
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ioRawWaitForData1000Cycles:
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ldi r20, 140 ; 1
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ioRawWaitForData_loop:
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inr r22, UART_REG_UCSRA ; 2
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sbrc r22, UART_BIT_RXC ; 2/3
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rjmp ioRawWaitForData_gotit ; 2
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dec r20 ; 1
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brne ioRawWaitForData_loop ; 1/2 -> 7 per loop, max about 1000
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clc ; 1
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ret ; 4
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ioRawWaitForData_gotit:
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sec ; 1
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ret ; 4
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; @end
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; ---------------------------------------------------------------------------
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; @routine ioRawWaitForAttnSeconds
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;
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; Wait for ATTN state max given seconds
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;
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; @return CFLAG set if okay (data available), cleared on error
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||||
; @param R16 expected state (0xff for high, 0 for low)
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; @param r20 maximum number of seconds to wait
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; @clobbers: r20, r22
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ioRawWaitForAttnSeconds:
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ioRawWaitForAttnSeconds_loop:
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push r20
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rcall ioRawWaitForAttn1s ; (r20, r22)
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pop r20
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brcs ioRawWaitForAttnSeconds_gotit
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sbi LED_PIN, LED_PINNUM ; toggle (doen't work on AtMega8515)
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dec r20
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brne ioRawWaitForAttnSeconds_loop
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clc
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ioRawWaitForAttnSeconds_gotit:
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ret
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; @end
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||||
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||||
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||||
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||||
; ---------------------------------------------------------------------------
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||||
; @routine ioRawWaitForAttn1s
|
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;
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||||
; Wait for ATTN state for max 1s
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||||
;
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||||
; @param R16 expected state (0xff for high, 0 for low)
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||||
; @return CFLAG set if okay (ATTN state reached), cleared on error
|
||||
; @clobbers: r20, r22
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||||
|
||||
ioRawWaitForAttn1s:
|
||||
ldi r20, 100
|
||||
ioRawWaitForAttn1s_loop:
|
||||
push r20
|
||||
rcall ioRawWaitForAttn10ms ; (R20, R22)
|
||||
pop r20
|
||||
brcs ioRawWaitForAttn1s_gotit
|
||||
dec r20
|
||||
brne ioRawWaitForAttn1s_loop
|
||||
clc
|
||||
ioRawWaitForAttn1s_gotit:
|
||||
ret
|
||||
; @end
|
||||
|
||||
|
||||
|
||||
; ---------------------------------------------------------------------------
|
||||
; @routine ioRawWaitForAttn10ms
|
||||
;
|
||||
; Wait for ATTN state for max 10 milliseconds.
|
||||
;
|
||||
; @param R16 expected state (0xff for high, 0 for low)
|
||||
; @return CFLAG set if okay (ATTN state reached), cleared on error
|
||||
; @clobbers: r20, r22
|
||||
|
||||
ioRawWaitForAttn10ms:
|
||||
.if clock == 8000000
|
||||
ldi r20, 80
|
||||
.endif
|
||||
.if clock == 1000000
|
||||
ldi r20, 10
|
||||
.endif
|
||||
ioRawWaitForAttn10ms_loop:
|
||||
push r20
|
||||
rcall ioRawWaitForAttn1000Cycles ; (r20, r22)
|
||||
pop r20
|
||||
brcs ioRawWaitForAttn10ms_gotit
|
||||
dec r20
|
||||
brne ioRawWaitForAttn10ms_loop
|
||||
clc
|
||||
ioRawWaitForAttn10ms_gotit:
|
||||
ret
|
||||
; @end
|
||||
|
||||
|
||||
|
||||
; ---------------------------------------------------------------------------
|
||||
; @routine ioRawWaitForAttnState1000Cycles
|
||||
;
|
||||
; Wait for ATTN state for max 1000 clock cycles
|
||||
; (about 1ms at 1MHz, 0.125ms at 8MHz)
|
||||
;
|
||||
; @param R16 expected state (0xff for high, 0 for low)
|
||||
; @return CFLAG set if okay (packet received), cleared on error
|
||||
; @clobbers: r20, r22
|
||||
|
||||
ioRawWaitForAttn1000Cycles:
|
||||
ldi r20, 90 ; 1
|
||||
ioRawWaitForAttn1000Cycles_loop:
|
||||
push r17 ; +2
|
||||
in r17, COM_ATTN_INPUT ; +1
|
||||
eor r17, r16 ; +1
|
||||
andi r17, (1<<COM_ATTN_PIN) ; +1
|
||||
pop r17 ; +2
|
||||
breq ioRawWaitForAttn1000Cycles_stateReached ; +1
|
||||
dec r20 ; +1
|
||||
brne ioRawWaitForAttn1000Cycles_loop ; +2
|
||||
clc
|
||||
ret
|
||||
ioRawWaitForAttn1000Cycles_stateReached:
|
||||
sec
|
||||
ret
|
||||
; @end
|
||||
|
||||
|
||||
|
||||
; ---------------------------------------------------------------------------
|
||||
; @routine ioRawWaitForOneBitLength
|
||||
;
|
||||
; wait for one bit length (minus cycles for call and ret).
|
||||
;
|
||||
; @clobbers r22
|
||||
|
||||
ioRawWaitForOneBitLength:
|
||||
Utils_WaitNanoSecs COM_BIT_LENGTH, 7, r22 ; wait for one bit duration (minus RCALL/RET)
|
||||
ret
|
||||
; @end
|
||||
|
||||
|
||||
|
||||
|
||||
Reference in New Issue
Block a user