C语言 cortex-A7核 点LED灯 （附 汇编实现、使用C语言 循环实现、使用C语言 封装函数实现【重要、常用】）
1 汇编实现
text
global _start
start:
************** LED1点灯 ---> PE10 **************/
************** RCC章节初始化 **************/
CC_INIT:@1.使能GPIOE组控制器，通过RCC_MP_AHB4ENSETR寄存器设置GPIOE组使能0x50000A28[4]= 1ldr r0,=0x50000A28 @准备一块地址空间0x50000A28ldr r1,[r0] @将0x50000A28这块地址中的内容，读到目标寄存器r1中orr r1,r1,#(0x3 << 4) @将r1寄存器第[5:4] = 11，保证其他位不变 str r1,[r0] @将r1寄存器中的值，写回0x50000A28这块地址空间中************** LED1对应GPIO章节初始化 **************/
ED1_INIT:@1.通过GPIOE_MODER寄存器，设置PE10引脚为 输出模式 0x50006000[21:20] = 01ldr r0,=0x50006000ldr r1,[r0]orr r1,r1,#(0x3 << 20)and r1,r1,#(~(0x1 << 21))str r1,[r0]@2.通过GPIOE_OTYPER寄存器，设置PE10引脚为 推挽输出类型 0x50006004[10] = 0ldr r0,=0x50006004ldr r1,[r0]and r1,r1,#(~(0x1 << 10))str r1,[r0]@3.通过GPIOE_OSPEEDR寄存器，设置PE10引脚为 低速输出 0x50006008[21:20] = 00ldr r0,=0x50006008ldr r1,[r0]and r1,r1,#(~(0x3 << 20))str r1,[r0]@4.通过GPIOE_PUPDR寄存器，设置PE10引脚 禁止上下拉电阻 0x5000600C[21:20] = 00ldr r0,=0x5000600Cldr r1,[r0]and r1,r1,#(~(0x3 << 20))str r1,[r0]************** LED2对应GPIO章节初始化 **************/
ED2_INIT:@1.通过GPIOE_MODER寄存器，设置PF10引脚为 输出模式 0x50007000[21:20] = 01ldr r0,=0x50007000ldr r1,[r0]orr r1,r1,#(0x3 << 20)and r1,r1,#(~(0x1 << 21))str r1,[r0]@2.通过GPIOE_OTYPER寄存器，设置PF10引脚为 推挽输出类型 0x50007004[10] = 0ldr r0,=0x50007004ldr r1,[r0]and r1,r1,#(~(0x1 << 10))str r1,[r0]@3.通过GPIOE_OSPEEDR寄存器，设置PF10引脚为 低速输出 0x50007008[21:20] = 00ldr r0,=0x50007008ldr r1,[r0]and r1,r1,#(~(0x3 << 20))str r1,[r0]@4.通过GPIOE_PUPDR寄存器，设置PF10引脚 禁止上下拉电阻 0x5000700C[21:20] = 00ldr r0,=0x5000700Cldr r1,[r0]and r1,r1,#(~(0x3 << 20))str r1,[r0]/************** LED3对应GPIO章节初始化 **************/
ED3_INIT:@1.通过GPIOE_MODER寄存器，设置PE8引脚为 输出模式 0x50006000[17:16] = 01ldr r0,=0x50006000ldr r1,[r0]orr r1,r1,#(0x3 << 16)and r1,r1,#(~(0x1 << 17))str r1,[r0]@2.通过GPIOE_OTYPER寄存器，设置PE8引脚为 推挽输出类型 0x50006004[8] = 0ldr r0,=0x50006004ldr r1,[r0]and r1,r1,#(~(0x1 << 8))str r1,[r0]@3.通过GPIOE_OSPEEDR寄存器，设置PE8引脚为 低速输出 0x50006008[17:16] = 00ldr r0,=0x50006008ldr r1,[r0]and r1,r1,#(~(0x3 << 16))str r1,[r0]@4.通过GPIOE_PUPDR寄存器，设置PE8引脚 禁止上下拉电阻 0x5000600C[17:16] = 00ldr r0,=0x5000600Cldr r1,[r0]and r1,r1,#(~(0x3 <<16))str r1,[r0]oop:bl LED1_ONbl delay_1sbl LED1_OFFbl delay_1sbl LED2_ONbl delay_1sbl LED2_OFFbl delay_1sbl LED3_ON bl delay_1sbl LED3_OFFbl delay_1sb Loop/************** LED1点亮 **************/
ED1_ON:@1.通过GPIOE_ODR寄存器，设置PE10引脚输出高电平 0x50006014[10] = 1ldr r0,=0x50006014ldr r1,[r0]orr r1,r1,#(0x1 << 10)str r1,[r0]mov pc,lr/************** LED1熄灭 **************/
ED1_OFF:@1.通过GPIOE_ODR寄存器，设置PE10引脚输出低电平 0x50006014[10] = 0ldr r0,=0x50006014ldr r1,[r0]bic r1,r1,#(0x1 << 10)str r1,[r0]mov pc,lr/************** LED2点亮 **************/
ED2_ON:@1.通过GPIOF_ODR寄存器，设置PE10引脚输出高电平 0x50007014[10] = 1ldr r0,=0x50007014ldr r1,[r0]orr r1,r1,#(0x1 << 10)str r1,[r0]mov pc,lr/************** LED2熄灭 **************/
ED2_OFF:@1.通过GPIOF_ODR寄存器，设置PE10引脚输出低电平 0x50006014[10] = 0ldr r0,=0x50007014ldr r1,[r0]bic r1,r1,#(0x1 << 10)str r1,[r0]mov pc,lr/************** LED3点亮 **************/
ED3_ON:@1.通过GPIOF_ODR寄存器，设置PE10引脚输出高电平 0x50006014[8] = 1ldr r0,=0x50006014ldr r1,[r0]orr r1,r1,#(0x1 << 8)str r1,[r0]mov pc,lr/************** LED3熄灭 **************/
ED3_OFF:@1.通过GPIOE_ODR寄存器，设置PE10引脚输出低电平 0x50006014[8] = 0ldr r0,=0x50006014ldr r1,[r0]bic r1,r1,#(0x1 << 8)str r1,[r0]mov pc,lr大概1s的延时函数
elay_1s:mov r3, #0x10000000mm:cmp r3, #0subne r3, r3, #1bne mmmov pc, lr
end
2 C语言实现
led.h
#ifndef __LED_H__
#define __LED_H__ //结构体封装
typedef struct{ volatile unsigned int MODER; volatile unsigned int OTYPER; volatile unsigned int OSPEEDR; volatile unsigned int PUPDR; volatile unsigned int IDR; volatile unsigned int ODR;
}gpio_t; #define GPIOE ((gpio_t*)0x50006000)
#define GPIOF ((gpio_t*)0x50007000)
#define RCC_MP_AHB4_ENSETR (*(volatile unsigned int*)0x50000A28) //LED1 ===> PE10
//RCC/GPIO章节初始化
void led1_rcc_gpio_init();
//LED1点亮
void led1_on();
//LED1熄灭
void led1_off();
//LED1 ===> PE10 //LED2 ===> PF10
//RCC/GPIO章节初始化
void led2_rcc_gpio_init();
//LED2点亮
void led2_on();
//LED2熄灭
void led2_off(); //LED3 ===> PE8
//RCC/GPIO章节初始化
void led3_rcc_gpio_init();
//LED3点亮
void led3_on();
//LED3熄灭
void led3_off();
#endif led.c
#include "led.h" //LED1 ---> PE10
//RCC/GPIO章节初始化
void led1_rcc_gpio_init()
{ //0、使能GPIOE组控制器，通过RCC_MP_AHB4_ENSETR寄存器设置GPIOE组使能0x50000A28[4] = 1 RCC_MP_AHB4_ENSETR |= (0X1 << 4); //1、通过GPIOE_MODER寄存器，设置PE10引脚为输出模式 0x50006000[21:20] = 01 GPIOE->MODER &= (~(0x1 << 21)); //21位清0 GPIOE->MODER |= (0x1 << 20); //20位置1 //2、通过GPIOE_OTYPER寄存器，设置PE10引脚为推挽输出类型 0x50006004[10] = 0 GPIOE->OTYPER &= (~(0x1 << 10)); //3、通过GPIOE_OSPEEDR寄存器，设置PE10引脚为低速输出 0x50006008[21:20] = 00 GPIOE->OSPEEDR &= (~(0x3 << 20)); //4、通过GPIOE_PUPDR寄存器，设置PE10引脚禁止上下拉电阻 0x5000600C[21:20] = 00 GPIOE->PUPDR &= (~(0x3 << 20));
} //LED1点亮
void led1_on()
{ //通过GPIOE_ODR寄存器，设置PE10引脚输出高电平 0x50006014[10] = 1 GPIOE->ODR |= (0x1 << 10);
}
//LED1熄灭
void led1_off()
{ //通过GPIOE_ODR寄存器，设置PE10引脚输出低电平 0x50006014[10] = 0 GPIOE->ODR &= (~(0x1) << 10);
} //LED2 ---> PF10
//RCC/GPIO章节初始化
void led2_rcc_gpio_init()
{ //0、使能GPIOE组控制器，通过RCC_MP_AHB4_ENSETR寄存器设置GPIOE组使能0x50000A28[5] = 1 RCC_MP_AHB4_ENSETR |= (0X1 << 5); //1、通过GPIOF_MODER寄存器，设置PF10引脚为输出模式 0x50007000[21:20] = 01 GPIOF->MODER &= (~(0x1 << 21)); //21位清0 GPIOF->MODER |= (0x1 << 20); //20位置1 //2、通过GPIOE_OTYPER寄存器，设置PF10引脚为推挽输出类型 0x50007004[10] = 0 GPIOF->OTYPER &= (~(0x1 << 10)); //3、通过GPIOE_OSPEEDR寄存器，设置PF10引脚为低速输出 0x50007008[21:20] = 00 GPIOF->OSPEEDR &= (~(0x3 << 20)); //4、通过GPIOE_PUPDR寄存器，设置PF10引脚禁止上下拉电阻 0x5000700C[21:20] = 00 GPIOF->PUPDR &= (~(0x3 << 20));
} //LED2点亮
void led2_on()
{ //通过GPIOF_ODR寄存器，设置PF10引脚输出高电平 0x50007014[10] = 1 GPIOF->ODR |= (0x1 << 10);
}
//LED2熄灭
void led2_off()
{ //通过GPIOF_ODR寄存器，设置PF10引脚输出低电平 0x50007014[10] = 0 GPIOF->ODR &= (~(0x1) << 10);
} //LED3 ---> PE8
//RCC/GPIO章节初始化
void led3_rcc_gpio_init()
{ //0、使能GPIOE组控制器，通过RCC_MP_AHB4_ENSETR寄存器设置GPIOE组使能0x50000A28[4] = 1 RCC_MP_AHB4_ENSETR |= (0X1 << 4); //1、通过GPIOE_MODER寄存器，设置PE10引脚为输出模式 0x50006000[17:16] = 01 GPIOE->MODER &= (~(0x1 << 17)); //17位清0 GPIOE->MODER |= (0x1 << 16); //16位置1 //2、通过GPIOE_OTYPER寄存器，设置PE10引脚为推挽输出类型 0x50006004[8] = 0 GPIOE->OTYPER &= (~(0x1 << 8)); //3、通过GPIOE_OSPEEDR寄存器，设置PE10引脚为低速输出 0x50006008[17:16] = 00 GPIOE->OSPEEDR &= (~(0x3 << 16)); //4、通过GPIOE_PUPDR寄存器，设置PE10引脚禁止上下拉电阻 0x5000600C[17:16] = 00 GPIOE->PUPDR &= (~(0x3 << 16));
} //LED1点亮
void led3_on()
{ //通过GPIOE_ODR寄存器，设置PE10引脚输出高电平 0x50006014[8] = 1 GPIOE->ODR |= (0x1 << 8);
}
//LED1熄灭
void led3_off()
{ //通过GPIOE_ODR寄存器，设置PE10引脚输出低电平 0x50006014[8] = 0 GPIOE->ODR &= (~(0x1) << 8);
} main.c
#include "led.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{int i,j;for(i = 0; i < ms;i++)for (j = 0; j < 1800; j++);
}int main()
{led1_rcc_gpio_init(); // LED灯初始化led2_rcc_gpio_init(); // LED灯初始化led3_rcc_gpio_init(); // LED灯初始化while(1){led1_on();delay_ms(500);led1_off();delay_ms(500);led2_on();delay_ms(500);led2_off();delay_ms(500);led3_on();delay_ms(500);led3_off();delay_ms(500);}return 0;
}3 循环实现
led.h
#ifndef __LED_H__
#define __LED_H__ #define RCC_MP_AHB4_ENSETR (*(volatile unsigned int*)0x50000A28) //结构体封装
typedef struct{ volatile unsigned int MODER; volatile unsigned int OTYPER; volatile unsigned int OSPEEDR; volatile unsigned int PUPDR; volatile unsigned int IDR; volatile unsigned int ODR;
}gpio_t; typedef enum{ LED_OFF=0, LED_ON,
}LED_C; typedef enum{ LED1=0, LED2, LED3
}LED; #define GPIOE ((gpio_t*)0x50006000)
#define GPIOF ((gpio_t*)0x50007000) void led_init(LED l);
void led_con(LED l,LED_C c);
#endif
led.c
#include "led.h"
//初始化灯
void led_init(LED led)
{ switch(led) { case LED1: RCC_MP_AHB4_ENSETR |= (0X1 << 4); GPIOE->MODER &= (~(0x1 << 21)); //21位清0 GPIOE->MODER |= (0x1 << 20); //20位置1 GPIOE->OTYPER &= (~(0x1 << 10)); GPIOE->OSPEEDR &= (~(0x3 << 20)); GPIOE->PUPDR &= (~(0x3 << 20)); break; case LED2: RCC_MP_AHB4_ENSETR |= (0X1 << 5); GPIOF->MODER &= (~(0x1 << 21)); //21位清0 GPIOF->MODER |= (0x1 << 20); //20位置1 GPIOF->OTYPER &= (~(0x1 << 10)); GPIOF->OSPEEDR &= (~(0x3 << 20)); GPIOF->PUPDR &= (~(0x3 << 20)); break; case LED3: RCC_MP_AHB4_ENSETR |= (0X1 << 4); GPIOE->MODER &= (~(0x1 << 17)); //17位清0 GPIOE->MODER |= (0x1 << 16); //16位置1 GPIOE->OTYPER &= (~(0x1 << 8)); GPIOE->OSPEEDR &= (~(0x3 << 16)); GPIOE->PUPDR &= (~(0x3 << 16)); break; }
}
//控制灯
void led_con(LED led,LED_C c)
{ switch(led) { case LED1: switch(c) { case LED_OFF: GPIOE->ODR &= (~(0X1 << 10)); break; case LED_ON: GPIOE->ODR |= (0X1 << 10); break; } break; case LED2: switch(c) { case LED_OFF: GPIOF->ODR &= (~(0X1 << 10)); break; case LED_ON: GPIOF->ODR |= (0X1 << 10); break; } break; case LED3: switch(c) { case LED_OFF: GPIOE->ODR &= (~(0X1 << 8)); break; case LED_ON: GPIOE->ODR |= (0X1 << 8); break; } break; }
}
main.c
#include "led.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{int i,j;for(i = 0; i < ms;i++)for (j = 0; j < 1800; j++);
}int main()
{led_init(LED1);led_init(LED2);led_init(LED3);while(1){led_con(LED1,LED_ON);delay_ms(200);led_con(LED1,LED_OFF);delay_ms(200);led_con(LED2,LED_ON);delay_ms(200);led_con(LED2,LED_OFF);delay_ms(200);led_con(LED3,LED_ON);delay_ms(200);led_con(LED3,LED_OFF);delay_ms(200);}return 0;
} 4 封装函数实现【重要】【常用】
初始化函数函数===>函数参数、函数实现
led.h
#ifndef __LED_H__
#define __LED_H__//LED1 ---> PE10
//LED2 ---> PF10
//LED3 ---> PE8//结构体封装
typedef struct{volatile unsigned int MODER; //0x00volatile unsigned int OTYPER; //0x04volatile unsigned int OSPEEDR; //0x08volatile unsigned int PUPDR; //0x0cvolatile unsigned int IDR; //0x10volatile unsigned int ODR; //0x14
}gpio_t;//GPIOE组基地址 0x50006000
#define GPIOE ((gpio_t*)0x50006000)//GPIOF组基地址 0x50007000
#define GPIOF ((gpio_t*)0x50007000)#define RCC_MP_AHB4ENSETR (*(volatile unsigned int*)0x50000A28)//引脚编号封装
#define GPIO_PIN_0 0
#define GPIO_PIN_1 1
#define GPIO_PIN_2 2
#define GPIO_PIN_3 3
#define GPIO_PIN_4 4
#define GPIO_PIN_5 5
#define GPIO_PIN_6 6
#define GPIO_PIN_7 7
#define GPIO_PIN_8 8
#define GPIO_PIN_9 9
#define GPIO_PIN_10 10
#define GPIO_PIN_11 11
#define GPIO_PIN_12 12
#define GPIO_PIN_13 13
#define GPIO_PIN_14 14
#define GPIO_PIN_15 15//模式寄存器封装
typedef enum{INPUT, //输入模式OUTPUT, //输出模式ALT, //复用功能模式ANALOG, //模拟功能模式
}gpio_moder_t;//输出类型寄存器封装
typedef enum{PP, //推挽OD, //开漏
}gpio_otyper_t;//输出速率寄存器封装
typedef enum{LOW, //低速MED, //中速HIGH, //高速VERY_HIGH, //快速
}gpio_ospeedr_t;//是否需要上下拉电阻进行封装
typedef enum{NO_PU_PD, //禁止上下拉电阻PU, //上拉PD, //下拉
}gpio_pupdr_t;//封装初始化结构体
typedef struct{gpio_moder_t moder; //模式相关寄存器gpio_otyper_t otyper; //输出类型寄存器gpio_ospeedr_t ospeedr; //输出速率寄存器gpio_pupdr_t pupdr; //是否需要上下拉电阻寄存器
}gpio_init_t;//输出高低电平
typedef enum{GPIO_RESET_T, //低电平GPIO_SET_T, //高电平
}gpio_status_t;//函数功能：gpio相关初始化工作
//参数1：GPIO组编号
//参数2：GPIO引脚编号
//参数3：初始化相关内容
//返回值：无
void hal_gpio_init(gpio_t * gpiox,unsigned int pin,gpio_init_t* init);//函数功能：gpio写相关操作
//参数1：GPIO组编号
//参数2：GPIO引脚编号
//参数3：写值 写1高电平 写0低电平
//返回值：无
void hal_gpio_write(gpio_t* gpiox,unsigned int pin,gpio_status_t status);#endifled.c
#include "led.h"
void hal_gpio_init(gpio_t * gpiox,unsigned int pin,gpio_init_t* init)
{//设置模式gpiox->MODER &= (~(0x3 << (pin * 2)));gpiox->MODER |= (init->moder << (pin * 2));//设置输出类型gpiox->OTYPER &= (~(0x1 << pin));gpiox->OTYPER |= (init->otyper << pin);//设置输出速率gpiox->OSPEEDR &= (~(0x3 << pin));gpiox->OSPEEDR |= (init->ospeedr << pin);//设置是否需要上下拉电阻gpiox->PUPDR &= (~(0x3 << pin));gpiox->PUPDR |= (init->pupdr << pin);
}void hal_gpio_write(gpio_t* gpiox,unsigned int pin,gpio_status_t status)
{if(status == GPIO_RESET_T){//熄灭gpiox->ODR &= (~(0X1 << pin));}else{//点亮gpiox->ODR |= (0x1 << pin);}
}main.c
#include "led.h"extern void printf(const char *fmt, ...);void delay_ms(int ms){int i,j;for(i = 0; i < ms;i++)for (j = 0; j < 1800; j++);}void led_init(){//GPIOE组 / GPIOF组使能RCC_MP_AHB4ENSETR |= (0x3 << 4);//结构体初始化gpio_init_t init = {OUTPUT,PP,LOW,NO_PU_PD};hal_gpio_init(GPIOE,GPIO_PIN_10,&init);hal_gpio_init(GPIOF,GPIO_PIN_10,&init);hal_gpio_init(GPIOE,GPIO_PIN_8,&init);}int main(){led_init(); //LED灯初始化while(1){hal_gpio_write(GPIOE,GPIO_PIN_10,GPIO_SET_T);delay_ms(200);hal_gpio_write(GPIOE,GPIO_PIN_10,GPIO_RESET_T);delay_ms(200);hal_gpio_write(GPIOF,GPIO_PIN_10,GPIO_SET_T);delay_ms(200);hal_gpio_write(GPIOF,GPIO_PIN_10,GPIO_RESET_T);delay_ms(200);hal_gpio_write(GPIOE,GPIO_PIN_8,GPIO_SET_T);delay_ms(200);hal_gpio_write(GPIOE,GPIO_PIN_8,GPIO_RESET_T);delay_ms(200);}return 0;}