190 lines
2.2 KiB
NASM
190 lines
2.2 KiB
NASM
// buffer.asm
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//
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// read 4 bytes of textfile from SPI starting at address 0x040000 and write
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// the string to SRAM. Finally read the string from SRAM and send
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// the string to UART_TX
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//
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// Put your code here:
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// cat.asm
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//
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// load spi flash rom starting at address 0x040000 and write the
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// data to UART_TX
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//
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// Put your code here:
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// D=M -> 1111110000010000
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// M=D -> 1110001100001000
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// M=0 -> 1110101010001000
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// read data starting at address
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// 0x03 0x04 0x00 0x00
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@3
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D=A
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@128
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M=D
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@4
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D=A
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@129
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M=D
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@130
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M=0
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@131
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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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@128
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D=A
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@CHARREAD
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M=D
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@WRITECOUNT
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M=0
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@SENDCOUNT
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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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@CHARREAD
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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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@CHARREAD
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M=M+1
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@132
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D=A
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@CHARREAD
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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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@WRITECOUNT
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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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@SRAM_D
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M=D
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@WRITECOUNT
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M=M+1
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@8
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D=A
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@WRITECOUNT
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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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@WAITBOOT
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0;JMP
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(WAITBOOT)
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@UART_TX
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D=M
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@BOOT
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D;JEQ
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@WAITBOOT
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0;JMP
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(BOOT)
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@SENDCOUNT
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D=M
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@SRAM_A
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M=D
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@SRAM_D
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D=M
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@UART_TX
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M=D
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@SENDCOUNT
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M=M+1
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@8
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D=A
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@SENDCOUNT
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D=D-M
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@ENDBOOT
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D;JEQ
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@WAITBOOT
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0;JMP
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(ENDBOOT)
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@POLL
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0;JMP
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// LED<->BUT loop
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(POLL)
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@BUT
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D=!M
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@LED
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M=D
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@POLL
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0;JMP
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