jzs3c2440 Bare Board Program Gpio Operation Summary

Two ways of assembling, assembling +c

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Assembler Programming LED_ON.S
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. text
. Global _start
_start:
LDR ro,=0x***//register address to operate Gpfcon
MOV r1, #0x * * *//Register value to be modified
STR R1,[R0]

LDR ro,=0x***//register address to operate Gpfdate
MOV r1, #0x * * *//Register value to be modified
STR R1,[R0]


Main_loop:
b main_loop

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Makefile

Led_on:led_on.s
Arm_linux_gcc-g-C Led_on.s-o led_on.o.
Arm_linux_ld-ttext 0x00000000-g Led_on.o-o led_on_elf
Arm_inux_objcopy-o binary-s Led_on.bin led_on_elf
Clean
Rm-f led_on_elf Led_on.bin *.O

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Assembly and C mixed-code CRTO.S LED_ON_C.C
******************************************
. text
. Global _start
_start:
LDR ro,=0x53000000//inhibit watchdog
mov r1, #0x0
STR R1,[R0]

LDR sp,=1024*4//Set stack
BL Main
Main_loop:
b main_loop

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#define GPFCON * * *//Register address required for operation
#define GPFDAT * * *

int main ()
{

gpfcon=0x00000;
gpfdat=0x10000;

return 0;
}
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Makefile
Led_on_c.bin:crt0. S LED_ON_C.C
Arm-linux-gcc-g-c-o crt0.o crt0. S
Arm-linux-gcc-g-c-o LED_ON_C.O LED_ON_C.C

Arm-linux-ld-ttext 0x0000000-g crt0.o Led_on_c.o-o led_on_c_elf

Arm-linux-objcopy-o binary-s led_on_c_elf Led_on_c.bin

arm-linux-objdump-d-M arm led_on_c_elf > Led_on_c.dis
Clean

Rm-f Led_on_c.dis led_on_c.bin led_on_c_elf *.o

jzs3c2440 Bare Board Program Gpio Operation Summary