First, let's take a look at my board (s3c2440)
It can be seen that to make the LED tube light up, just set nLED1 to a low level, that is, set the corresponding GPIO pin to a low level.
From the above two pictures, we can find that LED1, LED2, and LED4 correspond to the GPF port of S3c2440. So, by consulting the manual
You can know the address of the corresponding register. Then you can start programming.
.text
.global _start
_start:
@Configure GPF as an output pin
LDR R0, =0x56000050
MOV R1, #0x00005500
STR R1, [R0]
@Output low level
LDR R0, =0x56000054
MOV R1, #0x00000050
STR R1, [R0]
MAIN_LOOP:
B MAIN_LOOP
Makefile
led_on.bin: led_on.S
arm-linux-gcc -g -c -o led_on.o led_on.S
arm-linux-ld -Ttext 0x00000000 -g led_on.o -o led_on_elf
arm-linux-objcopy -O binary -S led_on_elf led_on.bin
clean:
rm -f led_on.bin led_on_elf *.o *.bak
Then pass
tftp 30000000 led_on.bin
nand write bootloader led_on.bin 4000
Just burn the executable file to Nand Flash.
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