嵌入式培训—12.10

① GPIO (   通用 I/O引脚   )

        STM32F429IGT6 共有176个引脚,其中144个引脚可被用于 GPIO;

        分为9组,为 A ~ I;每组15个引脚,从0 ~ 15;

        即:A0 ~ A15   ——  I0 ~ I15;

② GPIO的输入 / 输出

        (1)输出方式:

                a、推挽输出:两个MOS管同时工作且状态相反,可以加快 导通 / 截止 的速度;

                b、开漏输出:只有N-MOS工作,无高电平输出,可以使用一个上拉电阻提供高电平;

        (2)输入方式:

                a、模拟信号输入;

                b、数字信号输入:通过施密特触发器,可以加快边沿变化速度;

③ .c — >可执行文件的过程

        预处理 — > 编译(.c — > .s)— >汇编(.s — > .o)— >链接(提取多个.o文件中被使用的内容)— >生成可执行文件(.exe / .elf / .bin / .hex)

④ 可执行文件的构成

        Flash:

                    a、.bss(可优化段):存放未被使用的数据;

                    b、.data(数据段):存放地址,全局变量,常量,静态变量等;

                    c、.code(代码段);

        SRAM(存放临时数据):

                    a、创建栈空间,地址指向首地址;

                    b、创建堆空间,地址指向末地址;

⑤ 任务 — 控制PH10(低电平点亮,高电平熄灭)

        程序流程:

                        a、硬件初始化

                                (1)时钟源打开:通过RCC打开GPIO_H时钟源,RCC首地址0x40023800;

                                (2)外设初始化:

                                设置PH10为:

                                   输出:GPIOH_MODER = 0x100000,偏移0x00;

                                   推挽:GPIOH_OTYPER = 0x00,偏移0x04;

                                   低速:GPIOH_SPEEDER = 0x00,偏移0x08;

                                   上拉:GPIOH_PUPDR = 0x100000,偏移0x0C;

                               设置端口输出寄存器为:

                                   高电平:GPIOH_ODR = 0x400,偏移0x14;

                                   低电平:GPIOH_ODR = 0x00,偏移0x14;

⑥ 成果:七色灯,灯与蜂鸣器同时工作


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        源代码:

#include

#define  Time_Delay 3000

#define RCC_ADDR 0x40023800

#define RCC_AHB1ENR *((unsigned int *)(RCC_ADDR+0x30))

#define GPIOH_ADDR 0x40021C00

#define GPIOH_MODER *((unsigned int *)(GPIOH_ADDR + 0x00))

#define GPIOH_OTYPER *((unsigned int *)(GPIOH_ADDR + 0x04))

#define GPIOH_OSPEEDER *((unsigned int *)(GPIOH_ADDR + 0x08))

#define GPIOH_PUPDR *((unsigned int *)(GPIOH_ADDR + 0x0C))

#define GPIOH_ODR *((unsigned int *)(GPIOH_ADDR + 0x14))

#define GPIOI_ADDR 0x40022000

#define GPIOI_MODER *((unsigned int *)(GPIOI_ADDR + 0x00))

#define GPIOI_OTYPER *((unsigned int *)(GPIOI_ADDR + 0x04))

#define GPIOI_OSPEEDER *((unsigned int *)(GPIOI_ADDR + 0x08))

#define GPIOI_PUPDR *((unsigned int *)(GPIOI_ADDR + 0x0C))

#define GPIOI_ODR *((unsigned int *)(GPIOI_ADDR + 0x14))

void SystemInit(void)

{

}

void delay(unsigned int n)

{

unsigned int i,j;

for(i=0;i

for(j=0;j<1000;j++);

}

void Beep()

{

GPIOI_MODER = 0x400000;

GPIOI_OTYPER = 0x00;

GPIOI_PUPDR = 0x400000;

GPIOI_OSPEEDER = 0x00;

GPIOI_ODR = 0x800;

delay(Time_Delay);

GPIOI_ODR = 0x00;

}

void Red()

{

GPIOH_MODER = 0x100000; //Êä³ö

GPIOH_OTYPER = 0x00; //ÍÆÍì

GPIOH_PUPDR = 0x100000; //ÉÏÀ­

GPIOH_OSPEEDER = 0x00; //µÍËÙ

GPIOH_ODR = 0x00; //µÍ

Beep();

GPIOH_ODR = 0x400; //¸ß

delay(Time_Delay);

}

void Yellow()

{

GPIOH_MODER = 0x500000;

GPIOH_OTYPER = 0x00;

GPIOH_PUPDR = 0x500000;

GPIOH_OSPEEDER = 0x00;

GPIOH_ODR = 0x00;

Beep();

GPIOH_ODR = 0xC00;

delay(Time_Delay);

}

void Green()

{

GPIOH_MODER = 0x400000;

GPIOH_OTYPER = 0x00;

GPIOH_PUPDR = 0x400000;

GPIOH_OSPEEDER = 0x00;

GPIOH_ODR = 0x00;

Beep();

GPIOH_ODR = 0x800;

delay(Time_Delay);

}

void Cyan()

{

GPIOH_MODER = 0x1400000;

GPIOH_OTYPER = 0x00;

GPIOH_PUPDR = 0x1400000;

GPIOH_OSPEEDER = 0x00;

GPIOH_ODR = 0x00;

Beep();

GPIOH_ODR = 0x1800;

delay(Time_Delay);

}

void Blue()

{

GPIOH_MODER = 0x1000000;

GPIOH_OTYPER = 0x00;

GPIOH_PUPDR = 0x1000000;

GPIOH_OSPEEDER = 0x00;

GPIOH_ODR = 0x00;

Beep();

GPIOH_ODR = 0x1000;

delay(Time_Delay);

}

void Purple()

{

GPIOH_MODER = 0x1100000;

GPIOH_OTYPER = 0x00;

GPIOH_PUPDR = 0x1100000;

GPIOH_OSPEEDER = 0x00;

GPIOH_ODR = 0x00;

Beep();

GPIOH_ODR = 0x1400;

delay(Time_Delay);

}

void White()

{

GPIOH_MODER = 0x1500000;

GPIOH_OTYPER = 0x00;

GPIOH_PUPDR = 0x1500000;

GPIOH_OSPEEDER = 0x00;

GPIOH_ODR = 0x00;

Beep();

GPIOH_ODR = 0x1C00;

delay(Time_Delay);

}

int main(void)

{

//ʹÄÜʱÖÓÔ´

RCC_AHB1ENR = 0x100180;

//ÅäÖÃ

while(1)

{

//red

Red();

//yellow

Yellow();

//green

Green();

//cyan

Cyan();

//blue

Blue();

//purple

Purple();

//white

White();

}

}

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