STC15W104 >> Assembly >> W25Q64

Erase、Write、Read


參考資訊:
1. w25q64fw.pdf
2. w25qxx github

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

  mov r2, #0
  mov r1, #0
  mov r0, #0
  call w25q64_erase_sector

  mov r2, #0
  mov r1, #0
  mov r0, #0
  mov a, #55h
  call w25q64_write_byte

  mov r2, #0
  mov r1, #0
  mov r0, #0
  call w25q64_read_byte
  call uart_tx

  jmp $

w25q64_wait_busy:
  clr spi_cs
w0:
  mov a, #5
  call spi_txrx
  call spi_txrx
  anl a, #1
  cjne a, #0, w0
  setb spi_cs
  ret

w25q64_write_enable:
  clr spi_cs
  mov a, #6
  call spi_txrx
  setb spi_cs
  ret

w25q64_erase_sector:
  push 0
  push 1
  push 2
  call w25q64_write_enable
  clr spi_cs
  mov a, #20h
  call spi_txrx
  pop acc
  call spi_txrx
  pop acc
  call spi_txrx
  pop acc
  call spi_txrx
  setb spi_cs
  call w25q64_wait_busy
  ret

w25q64_write_byte:
  push acc
  push 0
  push 1
  push 2
  call w25q64_write_enable
  clr spi_cs
  mov a, #2h
  call spi_txrx
  pop acc
  call spi_txrx
  pop acc
  call spi_txrx
  pop acc
  call spi_txrx
  pop acc
  call spi_txrx
  setb spi_cs
  call w25q64_wait_busy
  ret

w25q64_read_byte:
  push 0
  push 1
  push 2
  clr spi_cs
  mov a, #03h
  call spi_txrx
  pop acc
  call spi_txrx
  pop acc
  call spi_txrx
  pop acc
  call spi_txrx
  call spi_txrx
  setb spi_cs
  ret

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

編譯程式:

$ mcu8051ide --compile main.s

完成


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