STM32CubeMX配置I2C读取DS3231
使用HAL库操作DS3231
因为DSP2这个项目需要计时间功能所以封装了一下这个芯片的程序
硬件设计
我将它接到了I2C1对应的IO口是（SCL > PB6 | SDA > PB7）
程序封装
CubeMX的I2C配置
DS3231.c
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : DS3231.c
* @brief : DS3231 program body
* @author : Lesterbor
* @time : 2021-09-26
******************************************************************************
* @attention
*
*
*
******************************************************************************
*/
/* USER CODE END Header */
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "BSP_DS3231.h"
#include "i2c.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PT */
uint8_t DS3231Buffer[1];
uint8_t DS3231TimeBuffer[8];
int8_t ErrorFlag = 0;
/* USER CODE END PT */
/* Function definition -------------------------------------------------------*/
/* USER CODE BEGIN FD */
/**
* @Function name BCD_DEC
* @Introduce BCD(8421)转DEC
* @Parameter BCD(8421)值
* @Return DEC值
*/
uint8_t BCD_DEC(uint8_t BCD_Data){
uint8_t DEC_Data;
DEC_Data= BCD_Data&0x0f;
BCD_Data >>= 4;
BCD_Data &= 0x0f;
BCD_Data *= 10;
DEC_Data += BCD_Data;
return DEC_Data;
}
/**
* @Function name DEC_BCD
* @Introduce DEC转BCD(8421)
* @Parameter DEC值
* @Return BCD(8421)值
*/
uint8_t DEC_BCD(uint8_t DEC_Data){
uint8_t BCD_DataA,BCD_DataB,BCD_Data;
BCD_DataA=DEC_Data/10;
BCD_DataB=DEC_Data%10;
BCD_Data=BCD_DataB+(BCD_DataA<<4);
return BCD_Data;
}
/**
* @Function name I2C_DS3231_ReadData
* @Introduce DS3231通过I2C读取一个字节
* @Parameter ReadAddr I2C读取地址
* @Return 失败返回 -1 成功返回 0
*/
uint8_t I2C_DS3231_ReadData(uint8_t ReadAddr){
uint8_t DS3231_DataAddr[1];
DS3231_DataAddr[0]= ReadAddr;
if(HAL_I2C_Master_Transmit(&hi2c1,(DS3231_ADDRESS|I2C_WR),DS3231_DataAddr,sizeof(DS3231_DataAddr), 1000) != HAL_OK){
ErrorFlag = -1;
return ErrorFlag;
}
if(HAL_I2C_Master_Receive(&hi2c1,(DS3231_ADDRESS|I2C_RD),DS3231Buffer,sizeof(DS3231Buffer), 1000) != HAL_OK){
ErrorFlag = -1;
return ErrorFlag;
}
return ErrorFlag;
}
/**
* @Function name I2C_DS3231_WriteData
* @Introduce DS3231通过I2C写一个字节
* @Parameter WriteAddr I2C写入地址 Data I2C写入数据
* @Return 失败返回 -1 成功返回 0
*/
uint8_t I2C_DS3231_WriteData(uint8_t WriteAddr,uint8_t Data){
uint8_t DS3231_Data[2];
DS3231_Data[0] = WriteAddr;
DS3231_Data[1] = Data;
if(HAL_I2C_Master_Transmit(&hi2c1,(DS3231_ADDRESS|I2C_WR),DS3231_Data,sizeof(DS3231_Data), 1000) != HAL_OK){
ErrorFlag = -1;
return ErrorFlag;
}
return ErrorFlag;
}
/**
* @Function name DS3231_SetTime
* @Introduce DS3231通过I2C设置时间
* @Parameter Yea 年份范围在0~99
* Mon 月份范围在0~12
* Dat 日 范围在1~31
* Wee 周 范围在1~7
* Hou 小时范围在0~23
* Min 分钟范围在0~59
* Sec 秒 范围在0~59
* @Return NULL
*/
void DS3231_SetTime(uint8_t Yea,uint8_t Mon,uint8_t Dat,uint8_t Wee,uint8_t Hou,uint8_t Min,uint8_t Sec){
I2C_DS3231_WriteData(Year_Register ,DEC_BCD(Yea));
I2C_DS3231_WriteData(Month_Register ,DEC_BCD(Mon));
I2C_DS3231_WriteData(Date_Register ,DEC_BCD(Dat));
I2C_DS3231_WriteData(Day_Register ,DEC_BCD(Wee));
I2C_DS3231_WriteData(Hour_Register ,DEC_BCD(Hou));
I2C_DS3231_WriteData(Minutes_Register ,DEC_BCD(Min));
I2C_DS3231_WriteData(Seconds_Register ,DEC_BCD(Sec));
}
/**
* @Function name DS3231_ReadTime
* @Introduce DS3231通过I2C读取时间
* @Return NULL
*/
void DS3231_ReadTime(void){
I2C_DS3231_ReadData(Seconds_Register);
DS3231TimeBuffer[7] = BCD_DEC(DS3231Buffer[0]);
I2C_DS3231_ReadData(Minutes_Register);
DS3231TimeBuffer[6] = BCD_DEC(DS3231Buffer[0]);
I2C_DS3231_ReadData(Hour_Register);
DS3231TimeBuffer[5] = BCD_DEC(DS3231Buffer[0]);
I2C_DS3231_ReadData(Day_Register);
DS3231TimeBuffer[4] = BCD_DEC(DS3231Buffer[0]);
I2C_DS3231_ReadData(Date_Register);
DS3231TimeBuffer[3] = BCD_DEC(DS3231Buffer[0]);
I2C_DS3231_ReadData(Month_Register);
DS3231TimeBuffer[2] = BCD_DEC(DS3231Buffer[0]);
I2C_DS3231_ReadData(Year_Register);
DS3231TimeBuffer[1] = BCD_DEC(DS3231Buffer[0]);
}
/**
* @Function name DS3231_ReadTime_ReturnPoint
* @Introduce 将读到的时间数据通过指针返回
* @attention DS3231_ReadTime_ReturnPoint()[7] 秒数据
* DS3231_ReadTime_ReturnPoint()[6] 分数据
* DS3231_ReadTime_ReturnPoint()[5] 时数据
* DS3231_ReadTime_ReturnPoint()[4] 周数据
* DS3231_ReadTime_ReturnPoint()[3] 日数据
* DS3231_ReadTime_ReturnPoint()[2] 月数据
* DS3231_ReadTime_ReturnPoint()[1] 年数据
* DS3231_ReadTime_ReturnPoint()[0] 空数据
* @Return NULL
*/
uint8_t *DS3231_ReadTime_ReturnPoint(void){
return DS3231TimeBuffer;
}
/* USER CODE END FD */
/************************ (C) COPYRIGHT Lesterbor *****END OF FILE****/
DS3231.h
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : DS3231.h
* @brief : Header for DS3231.c file.
* This file provides code for the configuration
* of the DS3231 instances
* @author : Lesterbor
* @time : 2021-09-26
******************************************************************************
* @attention
*
*
******************************************************************************
*/
/* USER CODE END Header */
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __DS3231_H_
#define __DS3231_H_
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "main.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PT */
#define I2C_WR 0x00 //写指令
#define I2C_RD 0x01 //读指令
#define DS3231_ADDRESS 0xD0 //DS3231地址
#define Seconds_Register 0x00 //秒钟寄存器
#define Minutes_Register 0x01 //分钟寄存器
#define Hour_Register 0x02 //小时寄存器
#define Day_Register 0x03 //星期寄存器
#define Date_Register 0x04 //日期寄存器
#define Month_Register 0x05 //月份寄存器（第七位是世纪位）
#define Year_Register 0x06 //年份寄存器
/* USER CODE END PT */
/* Exported functions prototypes ---------------------------------------------*/
/* USER CODE BEGIN EFP */
uint8_t BCD_DEC(uint8_t BCD_Data);
uint8_t DEC_BCD(uint8_t DEC_Data);
uint8_t I2C_DS3231_ReadData(uint8_t ReadAddr);
uint8_t I2C_DS3231_WriteData(uint8_t WriteAddr,uint8_t Data);
void DS3231_SetTime(uint8_t Yea,uint8_t Mon,uint8_t Dat,uint8_t Wee,uint8_t Hou,uint8_t Min,uint8_t Sec);
void DS3231_ReadTime(void);
uint8_t *DS3231_ReadTime_ReturnPoint(void);
/* USER CODE END EFP */
#endif /* __DS3231_H_ */
/************************ (C) COPYRIGHT Lesterbor *****END OF FILE*************/
使用方法
DS3231_ReadTime();
printf("Now Time :\n20%02d-%02d-%02d-%02d-%02d-%02d",
DS3231_ReadTime_ReturnPoint()[1],
DS3231_ReadTime_ReturnPoint()[2],
DS3231_ReadTime_ReturnPoint()[3],
DS3231_ReadTime_ReturnPoint()[5],
DS3231_ReadTime_ReturnPoint()[6],
DS3231_ReadTime_ReturnPoint()[7]
);
注意：每次取数据之前必须先读数据
