微處理器 - STCmicro STC15W104 - Assembly - W25Q64 - Read JEDEC ID

參考資訊：
http://plit.de/asem-51/
https://github.com/nimaltd/w25qxx
http://www.stcisp.com/stcisp620_off.html
https://sourceforge.net/projects/mcu8051ide/
https://www.winbond.com/resource-files/w25q64fw_revk%2007012016%20sfdp.pdf

SPI時序如下：


main.s

    uart_tx set p3.1
    spi_cs  set p3.4
    spi_do  set p3.5
    spi_di  set p3.2
    spi_clk set p3.3

    .org 0h
    jmp _start

    .org 100h
_start:
    setb spi_cs
    setb spi_do
    setb spi_di
    setb spi_clk

    ; Read JEDEC ID (9Fh)
    mov a, #9fh
    clr spi_cs
    call spi_txrx
    call spi_txrx
    call uart_tx
    call spi_txrx
    call uart_tx
    call spi_txrx
    call uart_tx
    setb spi_cs
    jmp $

spi_txrx:
    mov r0, #8
    mov r1, a
    mov r2, #0
s0:
    clr spi_clk
    mov a, r1
    rlc a
    mov r1, a
    jc s1
    clr spi_di
    sjmp s2
s1:
    setb spi_di
s2:
    setb spi_clk
    jb spi_do, s3
    clr c
    sjmp s4
s3:
    setb c
s4:
    mov a, r2
    rlc a
    mov r2, a
    djnz r0, s0
    mov a, r2
    ret

    ; 57600,N,8,1
    ; RC 11.0592MHz
uart_tx:
    mov r0, #8
    clr uart_tx
    mov r1, #44
    djnz r1, $
u0:
    rrc a
    jc u1
    clr uart_tx
    sjmp u2
u1:
    setb uart_tx
u2:
    mov r1, #44
    djnz r1, $
    djnz r0, u0
    setb uart_tx
    mov r1, #44
    djnz r1, $
    ret
    .end

編譯

$ mcu8051ide --compile main.s

完成