2023-01-11 11:13:09 +01:00
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//*****************************************************************************
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// Boot loader. Load HACK code from SPI address 0x010000 (64k) into SRAM and GO
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//*****************************************************************************
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//
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// Put your code here:
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2024-11-23 16:56:29 +05:30
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// read data starting at address
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// 0x03 0x01 0x00 0x00
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@3
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D=A
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@100
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M=D
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@1
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D=A
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@101
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M=D
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@102
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M=0
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@103
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M=0
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// wake up from deep power down and wait 3us
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// 0xAB
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@171
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D=A
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@SPI
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M=D
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@4
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D=A
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@COUNT
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M=D
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(DECR1)
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@COUNT
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DM=M-1
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@DECR1
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D;JGT
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@511
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D=A
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@SPI
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M=D
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@21
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D=A
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@COUNT
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M=D
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(DECR2)
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@COUNT
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DM=M-1
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@DECR2
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D;JGT
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//command stack base address
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@100
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D=A
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@READCOMMAND
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M=D
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@DIRECTION
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M=0
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@WORDCOUNT
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M=0
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@WAITREAD
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0;JEQ
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(WAITREAD)
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@SPI
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D=M
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@WAITREAD
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D;JLT
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@READ
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0;JMP
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(READ)
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// read
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@READCOMMAND
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A=M
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D=M
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@SPI
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M=D
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@READCOMMAND
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M=M+1
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@104
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D=A
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@READCOMMAND
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D=D-M
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@WAITREAD
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D;JGT
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@ENDREAD
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0;JMP
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(ENDREAD)
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@WAITWRITE
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0;JMP
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(WAITWRITE)
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@SPI
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D=M
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@WAITWRITE
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D;JLT
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@WRITE
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0;JMP
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(WRITE)
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@SPI
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M=0
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@4
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D=A
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@COUNT
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M=D
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(FROMSPI)
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@COUNT
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DM=M-1
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@FROMSPI
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D;JGT
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@DIRECTION
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D=M
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@WESTWORD
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D;JEQ
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@EASTWORD
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D;JGT
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(WESTWORD)
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@SPI
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D=M
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@R13
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M=D
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DM=D+M
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DM=D+M
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DM=D+M
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DM=D+M
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DM=D+M
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DM=D+M
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DM=D+M
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DM=D+M
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@DIRECTION
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M=1
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@WAITWRITE
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0;JMP
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(EASTWORD)
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@WORDCOUNT
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D=M
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@SRAM_A
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M=D
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@SPI
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D=M
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@R14
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M=D
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@R13
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D=M
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@R14
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D=D+M
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@SRAM_D
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M=D
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@DIRECTION
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M=0
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@WORDCOUNT
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M=M+1
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@6
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D=A
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@WORDCOUNT
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D=D-M
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@ENDWRITE
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D;JEQ
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@WAITWRITE
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0;JMP
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(ENDWRITE)
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@185
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D=A
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@SPI
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M=D
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@GO
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M=1
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