12.11-编程知识

1.q，w，e亮led1，2，3；

a，s，d灭led1，2，3；

main.c

#include "uar1.h"#include "led.h"void delay(int ms){int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++);}}int main(){//1.串口的初始化uart4_init();//LED初始化all_led_init();char a;//现象是发送一个a串口工具打印一个bwhile(1){//2.从串口读取一个字符a=mygetchar();//3.将读取到的字符+1发送回去myputchar(a);switch (a){case 'q': led1_on();break;case 'w': led2_on();break;case 'e': led3_on();break;case 'a': led1_off();break;case 's': led2_off();break;case 'd': led3_off(); break;   }}return 0;}

led.h

#ifndef __LED_H__
#define __LED_H__typedef struct
{unsigned int moder;unsigned int otyper;unsigned int ospeedr;unsigned int pupdr;unsigned int idr;unsigned int odr;unsigned int bsrr;
} gpio_t1;#define GPIOE1 ((gpio_t1 *)0X50006000)
#define GPIOF1 ((gpio_t1 *)0X50007000)
#define RCC_MP_AHB4ENSETR (*(unsigned int *)0X50000a28)
void all_led_init();
void led1_on();
void led2_on();
void led3_on();
void led1_off();
void led2_off();
void led3_off();#endif

uar1.h

#ifndef __UART_H__
#define __UART_H__
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_uart.h"
void uart4_init();
void myputchar(char i);
char mygetchar();
#endif

led.c

#include "led.h"
void all_led_init()
{// 1.使能外设时钟RCC_MP_AHB4ENSETR |= (0x3 << 4);// 2.设置PF10 PE10 PE8为输出输出GPIOE1->moder &= (~(0x3 << 20));GPIOE1->moder |= (0x1 << 20);GPIOF1->moder &= (~(0x3 << 20));GPIOF1->moder |= (0x1 << 20);GPIOE1->moder &= (~(0x3 << 16));GPIOE1->moder |= (0x1 << 16);// 3.设置推挽输出GPIOE1->otyper &= (~(0x1 << 10));GPIOF1->otyper &= (~(0x1 << 10));GPIOE1->otyper &= (~(0x1 << 8));// 4.设置输出速度为低速GPIOE1->ospeedr &= (~(0x3 << 20));GPIOF1->ospeedr &= (~(0x3 << 20));GPIOE1->ospeedr &= (~(0x3 << 16));// 5.设置无上拉下拉GPIOE1->pupdr &= (~(0x3 << 20));GPIOF1->pupdr &= (~(0x3 << 20));GPIOE1->pupdr &= (~(0x3 << 16));
}void led1_on()
{GPIOE1->odr |= (0x1 << 10);
}
void led2_on()
{GPIOF1->odr |= (0x1 << 10);
}
void led3_on()
{GPIOE1->odr |= (0x1 << 8);
}void led1_off()
{GPIOE1->odr &= (~(0x1 << 10));
}
void led2_off()
{GPIOF1->odr &= (~(0x1 << 10));
}
void led3_off()
{GPIOE1->odr &= (~(0x1 << 8));
}

uar1.c

#include"uar1.h"//串口数据初始化
void uart4_init()
{//设置UART4的RCc时钟使能//RCC_MP_APB1ENSETR[16]->1RCC->MP_APB1ENSETR |= (0x1<<16);//设置GPIOB和GPIOG的时钟使能//RCC_MP_AHB4ENSETR[6]->1//RCC_MP_AHB4ENSETR[1]->1RCC->MP_AHB4ENSETR |= (0x1<<1);RCC->MP_AHB4ENSETR |= (0X1<<6);//设置PG11和PB2功能复用为UART4功能//PG11//GPIOG_MODER[23:22]->10GPIOG->MODER &= (~(0X3<<22));GPIOG->MODER |= (0X2<<22);//GPIOG_AFRH[15:12]->0110    GPIOG->AFRH &= (~(0xf<<12));GPIOG->AFRH |= (0x6<<12);//PB2//GPIOB_MODER[5:4]->10//GPIOB_AFRL[11:8]->1000GPIOB->MODER &= (~(0x3<<4));GPIOB->MODER |= (0X2<<4);GPIOB->AFRL &= (~(0xF<<8));GPIOB->AFRL |= (0x8<<8);//禁用串口USART4->CR1 &=(~0x1);//设置数据8个数据位 CR1[28]->0  CR1[12]-》0USART4->CR1 &= (~(0X1<<28));USART4->CR1 &= (~(0X1<<12));//设置没有校验位CR1[10]->0USART4->CR1 &= (~(0X1<<10));//设置1个停止位CR2[13:12]->00USART4->CR2 &= (~(0x3<<12));//设置16倍采样 CR1[15]->0USART4->CR1 &= (~(0X1<<15));//设置波特率为115200 BRR=0X22BUSART4->BRR |= 0X22B;//设置1分频 PRESC[3:0]->0000USART4->PRESC &= (~(0XF));//使能发送器 CR1[3]->1USART4->CR1 |= (0X1<<3);//使能接收器 CR1[2]->1USART4->CR1 |= (0X1<<2);//使能串口 CR1[0]->1USART4->CR1 |= (0X1);
}
//封装函数发送一个字符数据
void myputchar(char c)
{//判断发送数据寄存器有没有数据，没有数据时可以发送while(!(USART4->ISR&(0X1<<7)));USART4->TDR=c;//将要发送的数据保存在发送寄存器中while(!(USART4->ISR&(0X1<<6)));//数据传输完成，函数结束
}
char mygetchar()
{char c;//判断是否有数据准备好while(!(USART4->ISR&(0X1<<5)));//数据传输完成，函数结束c=USART4->RDR;return c;}

2.字符串点亮

uar1.c

#include"uar1.h"
#include"led.h"
char buf[51]={0};
//串口数据初始化
void uart4_init()
{//设置UART4的RCc时钟使能//RCC_MP_APB1ENSETR[16]->1RCC->MP_APB1ENSETR |= (0x1<<16);//设置GPIOB和GPIOG的时钟使能//RCC_MP_AHB4ENSETR[6]->1//RCC_MP_AHB4ENSETR[1]->1RCC->MP_AHB4ENSETR |= (0x1<<1);RCC->MP_AHB4ENSETR |= (0X1<<6);//设置PG11和PB2功能复用为UART4功能//PG11//GPIOG_MODER[23:22]->10GPIOG->MODER &= (~(0X3<<22));GPIOG->MODER |= (0X2<<22);//GPIOG_AFRH[15:12]->0110    GPIOG->AFRH &= (~(0xf<<12));GPIOG->AFRH |= (0x6<<12);//PB2//GPIOB_MODER[5:4]->10//GPIOB_AFRL[11:8]->1000GPIOB->MODER &= (~(0x3<<4));GPIOB->MODER |= (0X2<<4);GPIOB->AFRL &= (~(0xF<<8));GPIOB->AFRL |= (0x8<<8);//禁用串口USART4->CR1 &=(~0x1);//设置数据8个数据位 CR1[28]->0  CR1[12]-》0USART4->CR1 &= (~(0X1<<28));USART4->CR1 &= (~(0X1<<12));//设置没有校验位CR1[10]->0USART4->CR1 &= (~(0X1<<10));//设置1个停止位CR2[13:12]->00USART4->CR2 &= (~(0x3<<12));//设置16倍采样 CR1[15]->0USART4->CR1 &= (~(0X1<<15));//设置波特率为115200 BRR=0X22BUSART4->BRR |= 0X22B;//设置1分频 PRESC[3:0]->0000USART4->PRESC &= (~(0XF));//使能发送器 CR1[3]->1USART4->CR1 |= (0X1<<3);//使能接收器 CR1[2]->1USART4->CR1 |= (0X1<<2);//使能串口 CR1[0]->1USART4->CR1 |= (0X1);
}
//封装函数发送一个字符数据
void myputchar(char c)
{//判断发送数据寄存器有没有数据，没有数据时可以发送while(!(USART4->ISR&(0X1<<7)));USART4->TDR=c;//将要发送的数据保存在发送寄存器中while(!(USART4->ISR&(0X1<<6)));//数据传输完成，函数结束
}
char mygetchar()
{char c;//判断是否有数据准备好while(!(USART4->ISR&(0X1<<5)));//数据传输完成，函数结束c=USART4->RDR;return c;}//输出一个字符串
void puts(char *s)
{while(*s){myputchar(*s);s++;}myputchar('\n');//切换到下一行myputchar('\r');//切换到一行的开头
}//读取一个字符串
char *gets()
{unsigned int i;for(i=0;i<50;i++){buf[i]=mygetchar();//接受字符串myputchar(buf[i]);//回显if(buf[i]=='\r')break;}buf[i]='\0';myputchar('\n');//换行return buf;
}
//字符串比较
int strcmp(char *str,char *dst)
{while(*str){if(*str != *dst){return 1;}   str++;dst++;          }return 0;
}
void deal(char*str)
{if(strcmp(str,"led1_on")==0){led1_on();}else if(strcmp(str,"led1_off")==0){led1_off();}else if(strcmp(str,"led2_on")==0){led2_on();}else if(strcmp(str,"led2_off")==0){led2_off();}else if(strcmp(str,"led3_on")==0){led3_on();}else if(strcmp(str,"led3_off")==0){led3_off();}
}

main.c

#include "uar1.h"#include "led.h"void delay(int ms){int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++);}}int main(){all_led_init();//1.串口的初始化uart4_init();char a;char *str;//现象是发送一个a串口工具打印一个bwhile(1){myputchar('\n');//切换到下一行myputchar('\r');//切换到一行的开头//2.从串口读取一个字符//a=mygetchar();//3.将读取到的字符+1发送回去//myputchar(a+1);str=gets();// puts(str);deal(str);}return 0;}