代码收藏家技术教程 2024-06-02

蓝桥杯物联网设计省赛备战第二天攻略

5.串口DMA的发送

(1)将时钟树配置为32MHz

(2)串口的配置

将PA2,PA3分别配置为USART_TX和USART_RX（此时他们为黄色状态代表配置了一半），在点击USART2mode选择Asynchronous(通用异步)，波特率改为9600，再点击DMA点击add，选择USART2_TX,最后在NVIC中如图中内容配置即可

(3)keil代码的生成

Final.c

#include "Final.h"
#include "gpio.h"
#include "string.h"

void Final_LD5(unsigned char state)
{
   switch(state)
   {
       case 0:
           HAL_GPIO_WritePin(LD5_GPIO_Port, LD5_Pin, GPIO_PIN_SET);
       break;
       case 1:
           HAL_GPIO_WritePin(LD5_GPIO_Port, LD5_Pin, GPIO_PIN_RESET);
       break;
       case 2:
           HAL_GPIO_TogglePin(LD5_GPIO_Port, LD5_Pin);
       break;
   }
}

void Final_Relay(unsigned char number,unsigned char state)
{
   switch(number)
   {
       case 1:
           switch(state)
           {
               case 0:
                   HAL_GPIO_WritePin(K1_GPIO_Port, K1_Pin, GPIO_PIN_RESET);
               break;
               case 1:
                   HAL_GPIO_WritePin(K1_GPIO_Port, K1_Pin, GPIO_PIN_SET);
               break;
               case 2:
                   HAL_GPIO_TogglePin(K1_GPIO_Port, K1_Pin);
               break;
           }
           break;
       case 2:
           switch(state)
           {
               case 0:
               HAL_GPIO_WritePin(K2_GPIO_Port, K2_Pin, GPIO_PIN_RESET);
               break;
               case 1:
               HAL_GPIO_WritePin(K2_GPIO_Port, K2_Pin, GPIO_PIN_SET);
               break;
               case 2:
               HAL_GPIO_TogglePin(K2_GPIO_Port, K2_Pin);
               break;
           }
           break;
   }
}

void HAL_GPIO_EXTI_Callback(unsigned short int GPIO_Pin)
{
   if(GPIO_Pin==KEY_Pin)
       Final_LD5(2);

}

void Final_Uart_Tx(unsigned char *final_uart_tx_data)
{
extern UART_HandleTypeDef huart2;
HAL_UART_Transmit_DMA(&huart2,final_uart_tx_data,strlen(final_uart_tx_data));

}

main.c

/* Includes ——————————————————————*/

#include "main.h"
#include "dma.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ———————————————————-*/
/* USER CODE BEGIN Includes */

#include "Final.h"//此处为Final.c头文件，只能在BEGIN和END之间添加才不会被覆盖

unsigned char final_uart_tx_data[]="USART TEST \r\n";//全局变量

/* USER CODE END Includes */

/* USER CODE BEGIN WHILE */
while (1)
{
       unsigned char final_uart_tx_data1[]={0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x10};
       unsigned char final_uart_tx_data2[]="\r\n USART1 TEST \r\n";
       Final_Uart_Tx(final_uart_tx_data2);
/* USER CODE END WHILE */

(4)实验现象

打开串口，可以根据main函数中的代码所知，现象如下

6.RTC时钟

(1)将时钟树配置为32MHz

(2)RTC时钟的配置

点击RTC，在Mode中勾选Activate Clock Source和Activate Calendar,下面就对时钟和日历进行自我修改即可

(3)keil代码的生成

Final.c

#include "Final.h"
#include "gpio.h"
#include "string.h"
#include "stdio.h"

void HAL_GPIO_EXTI_Callback(unsigned short int GPIO_Pin)
{
   if(GPIO_Pin==KEY_Pin)
       Final_LD5(2);

}

void Final_Uart_Tx(unsigned char *final_uart_tx_data)
{
extern UART_HandleTypeDef huart2;
HAL_UART_Transmit_DMA(&huart2,final_uart_tx_data,strlen(final_uart_tx_data));

}

//名称：fputc
//作用：串口2以阻塞模式发送字符串数据
//参数：系统函数无需关系
//返回值：无
//备注：尽量不要使用该串口函数

int fputc(int ch,FILE *f)//串口打印函数
{
   extern UART_HandleTypeDef huart2;//声明句柄
   HAL_UART_Transmit(&huart2,(uint8_t *)&ch,1,1000);//以阻塞模式发送数据
   return ch;
}
//名称：Final_RTC
//作用：读取RTC的年，月，星期，日，时，分，秒
//参数：无
//返回值：RTC的值
//备注：先读取Data，在读取Time,否则可能数据有误

unsigned char *Final_RTC(void)
{
   static unsigned char rtc_value[7];
   extern RTC_HandleTypeDef hrtc;
   RTC_TimeTypeDef time_value;
   RTC_DateTypeDef date_value;

   HAL_RTC_GetTime(&hrtc,&time_value,RTC_FORMAT_BIN);
   HAL_RTC_GetDate(&hrtc,&date_value,RTC_FORMAT_BIN);

   rtc_value[0]=date_value.Year;
   rtc_value[1]=date_value.Month;
   rtc_value[2]=date_value.WeekDay;
   rtc_value[3]=date_value.Date;

   rtc_value[4]=time_value.Hours;
   rtc_value[5]=time_value.Minutes;
   rtc_value[6]=time_value.Seconds;
   return rtc_value;
}

main.c

/* Includes ——————————————————————*/
#include "main.h"
#include "dma.h"
#include "rtc.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ———————————————————-*/
/* USER CODE BEGIN Includes */
#include "Final.h"
unsigned char final_uart_tx_data[]="USART TEST \r\n";
/* USER CODE END Includes */

/* USER CODE BEGIN WHILE */
while (1)
{
       unsigned char *final_uart_tx_data=Final_RTC();
       printf("\r\n RTC:%d-%d-%d \r\n %d:%d:%d \r\n",2000+final_uart_tx_data[0],
       final_uart_tx_data[1],final_uart_tx_data[3],final_uart_tx_data[4],
       final_uart_tx_data[5],final_uart_tx_data[6]);

       HAL_Delay(1000);
/* USER CODE END WHILE */