微處理器 - Rockchip RK3399 (NanoPi NEO4) - Assembly - LED

參考資訊：
https://github.com/xboot/xrock
https://github.com/trebisky/Rockchip
https://wiki.friendlyelec.com/wiki/index.php/NanoPi_NEO4
https://courses.cs.washington.edu/courses/cse469/19wi/arm64.pdf
https://www.rockchip.fr/Rockchip%20RK3399%20TRM%20V1.3%20Part2.pdf

LED腳位


GPIO Register


Data、Direction


main.s

    .global _start

    .equ GPIO0_BASE, 0xff720000
    .equ PA_DAT, (GPIO0_BASE + 0x00)
    .equ PA_DIR, (GPIO0_BASE + 0x04)

    .text
_start:
    b reset

    .org 0x100
reset:
    ldr x0, =PA_DIR
    ldr w1, =0xffffffff
    str w1, [x0]

    ldr x0, =PA_DAT
    ldr w1, =0xffffffff
0:
    eor w2, w2, w1
    str w2, [x0]
    ldr w3, =1000000
1:
    subs w3, w3, #1
    bne 1b
    b 0b
    .end

main.ld

MEMORY {
    RAM : ORIGIN = 0, LENGTH = 64K
}

SECTIONS {
    .text : { *(.text*) } > RAM
    .data : { *(.data*) } > RAM
    .bss : { *(.bss*) } > RAM
}

Makefile

all:
	aarch64-linux-gnu-as -mcpu=cortex-a53 -o main.o main.s
	aarch64-linux-gnu-ld -T main.ld -o main.elf main.o
	aarch64-linux-gnu-objcopy -O binary main.elf main.bin

run:
	xrock extra maskrom --rc4 on --sram main.bin

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

編譯、執行

$ make
    aarch64-linux-gnu-as -mcpu=cortex-a53 -o main.o main.s
    aarch64-linux-gnu-ld -T main.ld -o main.elf main.o
    aarch64-linux-gnu-objcopy -O binary main.elf main.bin

$ make run
    xrock extra maskrom --rc4 on --sram main.bin

完成