NUC972 >> Assembly

LED

---

參考資訊：
1. pdf
2. NUC970_NonOS_BSP

Enable GPIO Clock


GPIO Direction


Output Data


main.s

  .equ GPIOB_DIR,     (0xb8003000 + 0x40)
  .equ GPIOB_DATAOUT, (0xb8003000 + 0x44)
  .equ CLK_PCLKEN0,   (0xb0000200 + 0x18)
 
  .text
  .align 2
  .global _start
_start:    b reset
_undef:    b .
_swi:      b .
_pabort:   b .
_dabort:   b .
_reserved: b .
_irq:      b .
_fiq:      b .
 
reset:
  ldr r0, =CLK_PCLKEN0
  ldr r1, [r0]
  orr r1, #(1 << 3)
  str r1, [r0]
 
  ldr r0, =GPIOB_DIR
  ldr r1, =(1 << 0)
  str r1, [r0]
loop:
  ldr r0, =GPIOB_DATAOUT
  ldr r1, =(1 << 0)
  str r1, [r0]
  ldr r4, =500000
1:
  nop
  subs r4, r4, #1
  bne 1b
  ldr r0, =GPIOB_DATAOUT
  ldr r1, =~(1 << 0)
  str r1, [r0]
  ldr r4, =500000
1:
  nop
  subs r4, r4, #1
  bne 1b
  b loop
  .end

main.ld

MEMORY
{
  RAM(rwx) : ORIGIN = 0x000000, LENGTH = 0x08000000
}

SECTIONS
{
  .text :
  {
    *(.text);
    . = ALIGN(4);
    *(.rodata);
    . = ALIGN(4);
    *(.rodata*);
    . = ALIGN(4);
  } > RAM
}

Makefile

all:
	arm-none-eabi-as -mcpu=arm9 -o main.o main.s
	arm-none-eabi-ld -T main.ld -o main.elf main.o
	arm-none-eabi-objcopy -O binary main.elf main.bin

flash:
	sudo nuwriter -m sdram -d NUC972DF62Y.ini -a 0 -w main.bin -n

clean:
	rm -rf main.o main.elf main.bin

編譯、燒錄

$ make
  arm-none-eabi-as -mcpu=arm9 -o main.o main.s
  arm-none-eabi-ld -T main.ld -o main.elf main.o
  arm-none-eabi-objcopy -O binary main.elf main.bin

$ make flash
  sudo nuwriter -m sdram -d NUC972DF62Y.ini -a 0 -w main.bin -n

完成

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