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標題: smart210裸板蜂鳴器程序 [打印本頁]

作者: th_jonas 時間: 2017-7-23 20:05
標題: smart210裸板蜂鳴器程序
C語言版
start.s:

.global _start

_start:
bl main

loop:

b loop

.end

main.c:
#define GPIOCON_0 *((volatile unsigned int *)0xE02000A0)
#define GPIODAT_0 *((volatile unsigned char *)0xE02000A4)

void init_buzzer();
void on_buzzer();
void off_buzzer();
void delay();

void init_buzzer(){

GPIOCON_0 &=~0xf;
GPIOCON_0 |=0x1;
}

void on_buzzer(){

GPIODAT_0 |=0x1;
}

void off_buzzer(){

GPIODAT_0 &=~0x1;
}

void delay(){

int i=1000000;

while(i--);
}

int main(){

init_buzzer();

while(1){

on_buzzer();

delay();

off_buzzer();

delay();

}

return 0;
}

Makefile:
buz.bin:start.o main.o
arm-linux-ld -Ttext=0xd0020010 $^ -o temp
arm-linux-objcopy -O binary temp $@
%.o:%.s
arm-linux-gcc -c $< -o $@
%.o:%.c
arm-linux-gcc -c $< -o $@
clean:
rm -f temp *.bin *.o

===========================================================================================
匯編版：

start.s
.global _start

_start:

bl init_buzzer
loop:
bl on_buzzer

bl delay

bl off_buzzer

bl delay

b loop

init_buzzer:

ldr r0,=0xE02000A0
ldr r1, [r0]
bic r1, r1,#0xf
orr r1, r1,#0x1
str r1, [r0]

mov pc ,lr

on_buzzer:
ldr r0,=0xE02000A4
ldr r1, [r0]
orr r1, r1,#0x1
str r1, [r0]

mov pc ,lr

off_buzzer:
ldr r0,=0xE02000A4
ldr r1, [r0]
bic r1, r1,#0x1
str r1, [r0]

mov pc ,lr

delay:
ldr r0,=0x100000
lable:
subs r0,r0,#1
bne lable

mov pc ,lr

.end

===========================================================================================
Makefile:

buzer.bin:start.o
arm-linux-ld -Ttext=0xd0020010 $^ -o temp
arm-linux-objcopy -O binary temp $@

%.o:%.s
arm-linux-gcc -c $< -o $@
%.o:%.c
arm-linux-gcc -c $< -o $@

.PHONY: clean

clean:
rm *.o *.bin temp

歡迎光臨 (http://www.raoushi.com/bbs/)