Q8 >> Assembly

LCD(GPIO)

---

參考資料：
1. pdf
2. lichee
3. mangopi_r
4. allwinner

main.s

  .global _start
   
  .equiv PIO_BASE,  0x01c20800 
  .equiv PD,        (0x24 * 3)
  .equiv PE,        (0x24 * 4)
  .equiv PIO_CFG0,  0x00
  .equiv PIO_CFG1,  0x04
  .equiv PIO_CFG2,  0x08
  .equiv PIO_DATA,  0x10
 
  .equiv LCD_CS,    (1 << 21)
  .equiv LCD_RD,    (1 << 20)
  .equiv LCD_RS,    (1 << 19)
  .equiv LCD_WR,    (1 << 18)
  .equiv LCD_RST,   (1 << 11)
  .equiv LCD_BL,    (1 << 6)
   
  .arm
  .text
_start:
  .long 0xea000016
  .byte 'e', 'G', 'O', 'N', '.', 'B', 'T', '0'
  .long 0, __spl_size
  .byte 'S', 'P', 'L', 2
  .long 0, 0
  .long 0, 0, 0, 0, 0, 0, 0, 0
  .long 0, 0, 0, 0, 0, 0, 0, 0
    
_vector:
  b reset
  b .
  b .
  b .
  b .
  b .
  b .
  b .
    
reset:
  ldr r4, =PIO_BASE + PD
  ldr r1, =0x11111111
  str r1, [r4, #PIO_CFG0]
  str r1, [r4, #PIO_CFG1]
  ldr r1, =0x00111111
  str r1, [r4, #PIO_CFG2]
 
  ldr r4, =PIO_BASE + PE
  ldr r1, [r4, #PIO_CFG0]
  bic r1, #0xf000000
  orr r1, #0x1000000
  str r1, [r4, #PIO_CFG0]
 
  ldr r1, [r4, #PIO_CFG1]
  bic r1, #0xf000
  orr r1, #0x1000
  str r1, [r4, #PIO_CFG1]
 
  ldr r4, =PIO_BASE + PD
  ldr r1, =0xffffffff
  str r1, [r4, #PIO_DATA]
 
  ldr r4, =PIO_BASE + PE
  ldr r1, =0xffffffff
  str r1, [r4, #PIO_DATA]
 
  bl lcd_rst
 
  ldr r0, =0xb9
  bl lcd_cmd
  ldr r0, =0xff
  bl lcd_dat
  ldr r0, =0x83
  bl lcd_dat
  ldr r0, =0x57
  bl lcd_dat

  ldr r0, =1000
  bl delay

  ldr r0, =0xb6
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_dat
 
  ldr r0, =0x11
  bl lcd_cmd

  ldr r0, =1000
  bl delay

  ldr r0, =0x35
  bl lcd_cmd
 
  ldr r0, =0x3a
  bl lcd_cmd
  ldr r0, =0x05
  bl lcd_dat
 
  ldr r0, =0x36
  bl lcd_cmd
  ldr r0, =0x38
  bl lcd_dat
 
  ldr r0, =0xb0
  bl lcd_cmd
  ldr r0, =0x68
  bl lcd_dat
  
  ldr r0, =0x2b
  bl lcd_cmd
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x01
  bl lcd_dat
  ldr r0, =0x3f
  bl lcd_dat
 
  ldr r0, =0x2a
  bl lcd_cmd
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x01
  bl lcd_dat
  ldr r0, =0xdf
  bl lcd_dat
 
  ldr r0, =0x29
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_cmd
 
  ldr r4, =320*80
  ldr r5, =0xf800
0:
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b
  
  ldr r4, =320*80
  ldr r5, =0x7e0
0:
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b
  
  ldr r4, =320*80
  ldr r5, =0x1f
0:
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b
  b .
 
delay:
  push {lr}
0:
  subs r0, #1
  bne 0b
  pop {pc}
 
lcd_rst:
  push {r4, r5, lr}
  ldr r4, =PIO_BASE + PE
  ldr r5, =0xffffffff
 
  bic r5, #LCD_RST
  str r5, [r4, #PIO_DATA]
  ldr r0, =10000
  bl delay
 
  orr r5, #LCD_RST
  str r5, [r4, #PIO_DATA]
  ldr r0, =10000
  bl delay
  pop {r4, r5, pc}
 
lcd_wr:
  push {r4, r5, lr}
  ldr r4, =PIO_BASE + PD
 
  and r2, r0, #0x00ff
  and r3, r0, #0xff00
  lsl r2, #1
  lsl r3, #2
 
  eor r5, r5
  orr r5, r1
  orr r5, r2
  orr r5, r3
  orr r5, #LCD_RD
  str r5, [r4, #PIO_DATA]
 
  orr r5, #LCD_WR
  str r5, [r4, #PIO_DATA]
  pop {r4, r5, pc}
 
lcd_dat:
  push {lr}
  mov r1, #LCD_RS
  bl lcd_wr
  pop {pc}
 
lcd_cmd:
  push {lr}
  mov r1, #0
  bl lcd_wr
  pop {pc}
  .end

完成

返回上一頁