微處理器 - STCmicro STC15W204S - Assembly - 0.96" OLED 128x64 SSD1306

參考資訊：
https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
https://www.stcmicro.com/datasheet/STC15F2K60S2-en.pdf
https://github.com/adafruit/Adafruit_SSD1306/blob/master/Adafruit_SSD1306.cpp

main.s

    i2c_sda         set 0xcc
    i2c_scl         set 0xcd

    i2c_addr        equ 0x78
    lcd_width       equ 128
    lcd_height      equ 64

    cmd_contrast    equ 0x81
    cmd_disp_resume equ 0xa4
    cmd_normal_disp equ 0xa6
    cmd_invert_disp equ 0xa7
    cmd_disp_off    equ 0xae
    cmd_disp_on     equ 0xaf
    cmd_disp_offset equ 0xd3
    cmd_com_pins    equ 0xda
    cmd_vcom_detect equ 0xdb
    cmd_clock_div   equ 0xd5
    cmd_pre_charge  equ 0xd9
    cmd_multiplex   equ 0xa8
    cmd_start_line  equ 0x40
    cmd_memory_mode equ 0x20
    cmd_column_addr equ 0x21
    cmd_page_addr   equ 0x22
    cmd_scan_dec    equ 0xc8
    cmd_seg_remap   equ 0xa0
    cmd_charge_pump equ 0x8d

    .org 0h
    jmp _start

    .org 100h
_start:
    call ssd1306_init
    call ssd1306_set_col_addr
    call ssd1306_set_page_addr

    call i2c_start
    mov a, #i2c_addr
    call i2c_write
    mov a, #40h
    call i2c_write 

    mov r4, #16
m0:
    mov r5, #64
m1:
    mov a, #55h
    call i2c_write
    djnz r5, m1
    djnz r4, m0
    call i2c_stop
    jmp $

delay:
    mov r0, #10
    djnz r0, $
    ret

i2c_start:
    setb i2c_sda
    setb i2c_scl
    call delay
    clr i2c_sda
    call delay
    clr i2c_scl
    ret

i2c_stop:
    call delay
    clr i2c_sda
    call delay
    setb i2c_scl
    call delay
    setb i2c_sda
    ret

i2c_write:
    push 4
    push 5
    mov r4, #8
    mov r5, a
i0:
    mov a, r5
    rlc a
    mov r5, a
    jc i1
    clr i2c_sda
    sjmp i2
i1:
    setb i2c_sda
i2:
    call delay
    setb i2c_scl
    call delay
    clr i2c_scl
    djnz r4, i0

    call delay
    setb i2c_sda
    call delay
    setb i2c_scl
    call delay
    mov c, i2c_sda
    call delay
    clr i2c_scl
    pop acc
    mov r5, a
    pop acc
    mov r4, a
    ret

send_cmd:
    push 4
    mov r4, a
    call i2c_start
    mov a, #i2c_addr
    call i2c_write
    mov a, #0
    call i2c_write
    mov a, r4
    call i2c_write
    call i2c_stop
    pop acc
    mov r4, a
    ret

send_data:
    push 4
    mov r4, a
    call i2c_start
    mov a, #i2c_addr
    call i2c_write
    mov a, #40h
    call i2c_write
    mov a, r4
    call i2c_write
    call i2c_stop
    pop acc
    mov r4, a
    ret

ssd1306_init:
    mov a, #cmd_disp_off
    call send_cmd
    mov a, #cmd_clock_div
    call send_cmd
    mov a, #80h
    call send_cmd
    mov a, #cmd_multiplex
    call send_cmd
    mov a, #3fh
    call send_cmd
    mov a, #cmd_disp_offset
    call send_cmd
    mov a, #0
    call send_cmd
    mov a, #cmd_start_line
    call send_cmd
    mov a, #cmd_charge_pump
    call send_cmd
    mov a, #14h
    call send_cmd
    mov a, #cmd_memory_mode
    call send_cmd
    mov a, #0
    call send_cmd
    mov a, #cmd_seg_remap | 1
    call send_cmd
    mov a, #cmd_scan_dec
    call send_cmd
    mov a, #cmd_com_pins
    call send_cmd
    mov a, #12h
    call send_cmd
    mov a, #cmd_contrast
    call send_cmd
    mov a, #0cfh
    call send_cmd
    mov a, #cmd_pre_charge
    call send_cmd
    mov a, #0f1h
    call send_cmd
    mov a, #cmd_vcom_detect
    call send_cmd
    mov a, #40h
    call send_cmd
    mov a, #cmd_disp_resume
    call send_cmd
    mov a, #cmd_normal_disp
    call send_cmd
    mov a, #cmd_disp_on
    call send_cmd
    ret

ssd1306_set_col_addr:
    mov a, #cmd_column_addr
    call send_cmd
    mov a, #0
    call send_cmd
    mov a, #lcd_width - 1
    call send_cmd
    ret

ssd1306_set_page_addr:
    mov a, #cmd_page_addr
    call send_cmd
    mov a, #0
    call send_cmd
    mov a, #lcd_height / 8 - 1
    call send_cmd
    ret
    .end

編譯

$ mcu8051ide --compile main.s

燒錄

$ sudo stcgal -P stc15 main.hex

完成