Q8 >> Assembly

SELECT、START、VOL

---

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

暫存器


main.s

  .global _start
    
  .equiv CCU_BASE,              0x01c20000
  .equiv GPIO_BASE,             0x01c20800
  .equiv UART1_BASE,            0x01c25400
  .equiv TP_BASE,               0x01c24800
 
  .equiv PLL_PERIPH_CTRL_REG,   0x0028
  .equiv AHB_APB_HCLKC_CFG_REG, 0x0054
  .equiv BUS_CLK_GATING_REG2,   0x0068
  .equiv BUS_SOFT_RST_REG2,     0x02d0

  .equiv TP_CTRL_REG0,         0x00
  .equiv TP_CTRL_REG1,         0x04
  .equiv TP_CTRL_REG2,         0x08
  .equiv TP_CTRL_REG3,         0x0c
  .equiv TP_INT_FIFO_CTRL_REG, 0x10
  .equiv TP_INT_FIFO_STAT_REG, 0x14
  .equiv TP_COM_DATA_REG,      0x1c
  .equiv TP_DATA_REG,          0x24
  
  .equiv PA,        (0x24 * 0) 
  .equiv PORT_CFG0, 0x00
  .equiv PORT_DATA, 0x10
  .equiv UART_RBR,  0x0000
  .equiv UART_DLL,  0x0000
  .equiv UART_DLH,  0x0004
  .equiv UART_IER,  0x0004
  .equiv UART_IIR,  0x0008
  .equiv UART_LCR,  0x000c
  .equiv UART_MCR,  0x0010
  .equiv UART_USR,  0x007c
   
  .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, =CCU_BASE
  ldr r1, =0x80041800
  str r1, [r4, #PLL_PERIPH_CTRL_REG]
  ldr r1, =0x00003180
  str r1, [r4, #AHB_APB_HCLKC_CFG_REG]
  
  ldr r4, =GPIO_BASE
  ldr r1, =0x5520
  str r1, [r4, #(PA + PORT_CFG0)]
  
  ldr r4, =CCU_BASE
  ldr r1, =(1 << 21)
  str r1, [r4, #BUS_CLK_GATING_REG2]
  str r1, [r4, #BUS_SOFT_RST_REG2]
  
  ldr r4, =UART1_BASE
  ldr r1, =0x00
  str r1, [r4, #UART_IER]
  ldr r1, =0xf7
  str r1, [r4, #UART_IIR]
  ldr r1, =0x00
  str r1, [r4, #UART_MCR]
  ldr r1, [r4, #UART_LCR]
  orr r1, #(1 << 7)
  str r1, [r4, #UART_LCR]
  ldr r1, =54
  str r1, [r4, #UART_DLL]
  ldr r1, =0x00
  str r1, [r4, #UART_DLH]
  ldr r1, [r4, #UART_LCR]
  bic r1, #(1 << 7)
  str r1, [r4, #UART_LCR]
  ldr r1, [r4, #UART_LCR]
  bic r1, #0x1f
  orr r1, #0x03
  str r1, [r4, #UART_LCR]

  ldr r4, =TP_BASE
  ldr r1, =(3 << 20) | (1 << 16) | (1 << 0)
  str r1, [r4, #TP_CTRL_REG0]
  ldr r1, =(1 << 5) | (1 << 4) | (1 << 1)
  str r1, [r4, #TP_CTRL_REG1]
0:
  ldr r0, [r4, #TP_DATA_REG]
  lsr r0, #4
  bl uart_print_byte

  ldr r1, =10000
1:
  subs r1, #1
  bne 1b
  b 0b

uart_print_byte:
  push {r4, lr}
  ldr r4, =UART1_BASE
0:
  ldr r1, [r4, #UART_USR]
  tst r1, #(1 << 1)
  beq 0b
  strb r0, [r4, #UART_RBR]
  pop {r4, pc}

uart_print_4byte:
  push {r4, lr}
  mov r4, r0
  lsr r0, #24
  bl uart_print_byte
 
  mov r0, r4
  lsr r0, #16
  bl uart_print_byte
   
  mov r0, r4
  lsr r0, #8
  bl uart_print_byte
   
  mov r0, r4
  bl uart_print_byte
  pop {r4, pc}

  .end

返回上一頁