嵌入式栏目

TQ2440 蜂鸣器程序

根据原理图知道TOUT0与GPB0连接，因此当GPB0输出高电平时蜂鸣器鸣；当GPB0输出低电平时蜂鸣器停止鸣。
程序如下：
文件名 beep.S

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.include "gpio.inc"
.text
.global _start
_start:
        ldr r0, =GPBCON
        mov r1, #0b01
        str r1, [r0]
        ldr r0, =GPBUP
        mov r1, #0
        str r1, [r0]
        ldr r0, =GPBDAT
        mov r1, #1
next:   
        mvn r1, r1
        str r1, [r0]
        bl delay
        b next

delay:
        ldr r4, =100000
delay1: sub r4, r4, #1
        cmp r4, #0
        bgt delay1
        mov pc, lr

main_loop:
        b main_loop

文件名 gpio.inc

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.equ GPACON, 0x56000000
.equ GPADAT, 0x56000004

.equ GPBCON, 0x56000010
.equ GPBDAT, 0x56000014
.equ GPBUP,  0x56000018

.equ GPCCON, 0x56000020
.equ GPCDAT, 0x56000024
.equ GPCUP,  0x56000028

.equ GPDCON, 0x56000030
.equ GPDDAT, 0x56000034
.equ GPDUP,  0x56000038

.equ GPECON, 0x56000040
.equ GPEDAT, 0x56000044
.equ GPEUP,  0x56000048

.equ GPFCON, 0x56000050
.equ GPFDAT, 0x56000054
.equ GPFUP,  0x56000058

.equ GPGCON, 0x56000060
.equ GPGDAT, 0x56000064
.equ GPGUP,  0x56000068

.equ GPHCON, 0x56000070
.equ GPHDAT, 0x56000074
.equ GPHUP,  0x56000078

.equ GPJCON, 0x560000d0
.equ GPJDAT, 0x560000d4
.equ GPJUP,  0x560000d8

文件名 Makefile

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ARCH = arm-linux-
CC = $(ARCH)gcc
LD = $(ARCH)ld
OBJCOPY = $(ARCH)objcopy

all:beep.S
	$(CC) -g -c -o beep.o beep.S
	$(LD) -Ttext 0x00000000 -g -o beep-elf beep.o
	$(OBJCOPY) -O binary -S beep-elf beep.bin

clean:
	rm -f beep.o beep-elf beep.bin