版權聲明：本文爲博主(http://blog.csdn.net/lin_strong)原創文章，轉載請標明出處並事先取得博主同意 https://blog.csdn.net/lin_strong/article/details/80311683
剛剛寫完DS3231時鐘芯片的驅動程序。這裏開源出來供大家使用。需要的自取。
先簡單介紹下這個芯片，然後直接給驅動代碼以及示例代碼。
DS3231簡介
簡介
DS3231是一款低成本、高精度I2C實時時鐘(RTC)，具有集成的溫補晶體振盪器(TCXO)和晶體。該器件包含電池輸入端，斷開主電源時認可保持精確的計時。其提供年、月、日、星期、時、分、秒信息，提供有效期到2100年的閏年補償。
其帶有兩個提供不同精度的日曆鬧鐘，可在指定時刻在引腳上產生中斷信號。
支持快速(400kHz)I2C接口通訊。
時鐘精度在0℃到+40℃爲±2ppm，即一個月可能偏離5s多；在-40℃到+85℃爲±3.5ppm。
除了時鐘外，還提供精度爲±3℃的數字溫度傳感器輸出，內部會使用這個溫度傳感器自動進行補償以保證時間精度。
典型工作電路
框圖
寄存器
DS3231提供如下寄存器：
與DS3231的控制和交互就是通過存取這幾個寄存器來實現的，驅動代碼中提供了所有寄存器的結構體以及對寄存器的存取函數。
具體寄存器的意義請自己參照數據手冊。
與芯片的I2C通訊
I2C通訊的基本原理可以見我的上一個文章https://blog.csdn.net/lin_strong/article/details/80259571，翻譯的MC9S12XEP100的數據手冊，裏頭有對I2C通訊的詳細描述。
DS3231的主叫地址固定爲0b1101000，其內部存在一個寄存器指針，指向下一次讀/寫的寄存器，每次讀/寫一次後指針都會自增1，到最後一個寄存器後再指向第一個寄存器。
進行寫操作時第一個數據字節會對指針值進行修改。
驅動中提供的函數即封裝了這個過程。
代碼及測試
驅動代碼
頭文件：
/*
*******************************************************************************************
*
*
* DS3231 DRIVER MODULE
* Freescale MC9S12XEP100
* DS3231驅動模塊
*
* File : DS3231Driver.h
* By : Lin Shijun(http://blog.csdn.net/lin_strong)
* Date: 2018/05/14
* version: V1.0
* History: 2018/05/14 V1.0 the prototype
*********************************************************************************************
*/
#ifndef DS3231_DRIVER_H
#define DS3231_DRIVER_H
/*
********************************************************************************************
* MISCELLANEOUS
********************************************************************************************
*/
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
/*
******************************************************************************************
* CONSTANT
******************************************************************************************
*/
// address of register
typedef enum{
RegAddr_Sec, // Seconds 00-59
RegAddr_Min, // Minutes 00-59
RegAddr_Hour, // Hours 1–12 + AM/PM 00–23
RegAddr_Day, // Day 1 - 7
RegAddr_Date, // Data 01-31
RegAddr_CMon, // Century and month Century + 01–12
RegAddr_Year, // Year 00 - 99
RegAddr_Sec_A1, // Alarm 1 Seconds 00-59
RegAddr_Min_A1, // Alarm 1 Minutes 00-59
RegAddr_Hour_A1,// Alarm 1 Hours 1–12 + AM/PM 00–23
RegAddr_Da_A1, // Alarm 1 Day/Date 1 - 7 / 1 – 31
RegAddr_Min_A2, // Alarm 2 Minutes 00-59
RegAddr_Hour_A2,// Alarm 2 Hours 1–12 + AM/PM 00–23
RegAddr_Da_A2, // Alarm 2 Day/Date 1 - 7 / 1 – 31
RegAddr_Control,// Control
RegAddr_CtlStat,// Control/Status
RegAddr_AgOfset,// Aging offset
RegAddr_TempMSB,// MSB of Temp
RegAddr_TempLSB,// LSB of Temp
}DS3231REG_ADDR;
#define DS3231REG_ADDR_MAX RegAddr_TempLSB
/*
*******************************************************************************************
* CONFIGURE 主配置
*******************************************************************************************
*/
#define DS3231_CALLADDR 0b1101000 // DS32331的主叫地址
/*
****************************************************************************************
* ERROR CODES
****************************************************************************************
*/
#define DS3231_ERR_NULL 0 // if success
#define DS3231_ERR_COMM 1 // any error in communication
#define DS3231_ERR_REG 2 // wrong register
#define DS3231_ERR_ARG 3 // if wrong argument
/*
******************************************************************************************
* TYPE DEFINE
******************************************************************************************
*/
// struct of DS3231 register
typedef struct {
unsigned int sec_sd: 4; // ones digit of second 秒的個位
unsigned int sec_td: 3; // tens digit of second 秒的十位
unsigned int : 1;
} REG_SEC;
typedef struct {
unsigned int min_sd: 4; // ones digit of minute 分的個位
unsigned int min_td: 3; // tens digit of minute 分的十位
unsigned int : 1;
} REG_MIN;
typedef union {
struct{
unsigned int hour_sd:4; // ones digit of hour 分的個位
unsigned int hour_td:1; // tens digit of hour 分的個位
unsigned int isPM :1; // whether is pm
unsigned int is12sys:1; // whether is 12 hours system.
unsigned int :1;
}SYS12;
struct{
unsigned int hour_sd:4; // ones digit of hour 分的個位
unsigned int hour_td:2; // tens digit of hour 分的個位
unsigned int is12sys:1; // whether is 12 hours system.
unsigned int :1;
}SYS24;
} REG_HOUR;
typedef struct {
unsigned int day : 3; // the day of the week
unsigned int : 5;
} REG_DAY;
typedef struct {
unsigned int date_sd: 4; // ones digit of second 秒的個位
unsigned int date_td: 2; // tens digit of second 秒的十位
unsigned int : 2;
} REG_DATE;
typedef struct {
unsigned int mon_sd: 4; // ones digit of month 月的個位
unsigned int mon_td: 1; // tens digit of month 月的個位
unsigned int : 2;
unsigned int century:1; // hundreds digit of year
} REG_CMON;
typedef struct {
unsigned int year_sd: 4; // ones digit of year 月的個位
unsigned int year_td: 4; // tens digit of year 月的個位
} REG_YEAR;
typedef struct {
unsigned int sec_sd: 4; // ones digit of second 秒的個位
unsigned int sec_td: 3; // tens digit of second 秒的十位
unsigned int A1M1 : 1;
} REG_SEC_A1;
typedef struct {
unsigned int min_sd: 4; // ones digit of minute 分的個位
unsigned int min_td: 3; // tens digit of minute 分的十位
unsigned int A1M2 : 1;
} REG_MIN_A1;
typedef union {
struct{
unsigned int hour_sd:4; // ones digit of hour 分的個位
unsigned int hour_td:1; // tens digit of hour 分的個位
unsigned int isPM :1; // whether is pm
unsigned int is12sys:1; // whether is 12 hours system.
unsigned int A1M3 :1;
}SYS12;
struct{
unsigned int hour_sd:4; // ones digit of hour 分的個位
unsigned int hour_td:2; // tens digit of hour 分的個位
unsigned int is12sys:1; // whether is 12 hours system.
unsigned int A1M3 :1;
}SYS24;
} REG_HOUR_A1;
typedef union {
struct{
unsigned int day : 4; // the day of the week
unsigned int : 2;
unsigned int isDY : 1; // day selected
unsigned int A1M4 : 1;
}DAY;
struct{
unsigned int date_sd: 4; // ones digit of date
unsigned int date_td: 2; // tens digit of date
unsigned int isDY : 1; // day selected
unsigned int A1M4 : 1;
}DATE;
} REG_DA_A1;
typedef struct {
unsigned int min_sd: 4; // ones digit of minute 分的個位
unsigned int min_td: 3; // tens digit of minute 分的十位
unsigned int A2M2 : 1;
} REG_MIN_A2;
typedef union {
struct{
unsigned int hour_sd:4; // ones digit of hour 分的個位
unsigned int hour_td:1; // tens digit of hour 分的個位
unsigned int isPM :1; // whether is pm
unsigned int is12sys:1; // whether is 12 hours system.
unsigned int A2M3 :1;
}SYS12;
struct{
unsigned int hour_sd:4; // ones digit of hour 分的個位
unsigned int hour_td:2; // tens digit of hour 分的個位
unsigned int is12sys:1; // whether is 12 hours system.
unsigned int A2M3 :1;
}SYS24;
} REG_HOUR_A2;
typedef union {
struct{
unsigned int day : 4; // the day of the week
unsigned int : 2;
unsigned int isDY : 1; // day selected
unsigned int A2M4 : 1;
}DAY;
struct{
unsigned int date_sd: 4; // ones digit of date
unsigned int date_td: 2; // tens digit of date
unsigned int isDY : 1; // day selected
unsigned int A2M4 : 1;
}DATE;
} REG_DA_A2;
typedef struct{
unsigned int A1IE : 1;
unsigned int A2IE : 1;
unsigned int INTCN : 1;
unsigned int RS1 : 1;
unsigned int RS2 : 1;
unsigned int CONV : 1;
unsigned int BBSQW : 1;
unsigned int EOSC : 1;
} REG_CONTROL;
typedef struct{
unsigned int A1IF : 1;
unsigned int A2IF : 1;
unsigned int BSY : 1;
unsigned int EN32kHz: 1;
unsigned int : 3;
unsigned int OSF : 1;
} REG_CTLSTAT;
typedef struct{
unsigned int DATA : 7;
unsigned int SIGN : 1;
} REG_AGOFSET;
typedef struct{
char DATA;
} REG_TEMPMSB;
typedef struct{
unsigned int : 6;
unsigned int DATA : 2;
} REG_TEMPLSB;
// type of module
typedef struct {
REG_SEC sec;
REG_MIN min;
REG_HOUR hour;
REG_DAY day;
REG_DATE date;
REG_CMON cmon;
REG_YEAR year;
} TIME_STRUCT,*pTIME_STRUCT;
typedef struct{
REG_TEMPMSB integral; // integral part
REG_TEMPLSB fractional; // fractional part
} TEMP_STRUCT,*pTEMP_STRUCT;
typedef struct{
unsigned int errcode : 4; // see DS3231_ERR_XXX
unsigned int commerr : 4; // hold the errcode by user defined iic functions.
} DS3231_ERRCODE;
/*
************************************************************************************
* FUNCTION PROTOTYPES 函數原型
************************************************************************************
*/
unsigned char DS3231_Init(void);
DS3231_ERRCODE DS3231_GetReg(DS3231REG_ADDR reg,unsigned char *rst);
DS3231_ERRCODE DS3231_SetReg(DS3231REG_ADDR reg,unsigned char value);
DS3231_ERRCODE DS3231_GetRegs(DS3231REG_ADDR reg,unsigned char *pBuf,unsigned short len);
DS3231_ERRCODE DS3231_SetRegs(DS3231REG_ADDR reg,unsigned char *pBuf,unsigned short len);
DS3231_ERRCODE DS3231_SetTime(pTIME_STRUCT val);
DS3231_ERRCODE DS3231_GetTime(pTIME_STRUCT rst);
DS3231_ERRCODE DS3231_GetTemp(pTEMP_STRUCT rst);
// 用戶需要實現這幾個函數以使模塊能與DS3231進行IIC通訊
// Arguments: calAddr 7bits calling address
// pBuf pointer to the send/recv buffer
// len length of datas to be send/recv
// rst pointer to the return value
// val the byte to send
// return : 0 if success
// 1 - 15 errcode of IIC communication.
// meaning of errcode of these functions should be exactly same.
extern unsigned char IIC_ReadBurst(unsigned char calAddr,unsigned char *pBuf,unsigned short len);
extern unsigned char IIC_SendBurst(unsigned char calAddr,unsigned char *pBuf,unsigned short len);
extern unsigned char IIC_ReadByte(unsigned char calAddr,unsigned char *rst);
extern unsigned char IIC_SendByte(unsigned char calAddr,unsigned char val);
/*
************************************************************************************
* ERROR CHECK 錯誤檢查
************************************************************************************
*/
#endif // of DS3231_DRIVER_H源文件：
/*
*******************************************************************************************
*
*
* DS3231 DRIVER MODULE
* Freescale MC9S12XEP100
* DS3231驅動模塊
*
* File : DS3231Driver.c
* By : Lin Shijun(http://blog.csdn.net/lin_strong)
* Date: 2018/05/14
* version: V1.0
* History: 2018/05/14 V1.0 the prototype
*********************************************************************************************
*/
/*
*********************************************************************************************
* INCLUDES
*********************************************************************************************
*/
#include <string.h>
#include "DS3231Driver.h"
/*
*********************************************************************************************
* LOCAL FUNCTION
*********************************************************************************************
*/
#define regCheck() if(reg > DS3231REG_ADDR_MAX){err.errcode = DS3231_ERR_REG; return err;}
#define lenCheck() if(len > (DS3231REG_ADDR_MAX + 1) || len == 0){err.errcode = DS3231_ERR_ARG; return err;}
/*
*********************************************************************************************
* LOCAL VARIABLE
*********************************************************************************************
*/
// 發送緩存
static unsigned char Sendbuf[DS3231REG_ADDR_MAX + 2];
/*
*********************************************************************************************
* DS3231_Init()
*
* Description : Initialize DS3231 support hardware(marco style). 初始化DS3231硬件
*
* Arguments :
*
* Return : DS3231_ERR_NULL if success.
*
* Note(s) :
*********************************************************************************************
*/
unsigned char DS3231_Init(void){
return DS3231_ERR_NULL;
}
/*
*********************************************************************************************************
* DS3231_getReg()
*
* Description : get a register value of DS3231.
*
* Arguments : reg the register to get value.
* rst return value of result.
*
* Return : .errcode:
* DS3231_ERR_NULL if success.
* DS3231_ERR_COMM if error.
* DS3231_ERR_REG if unknown register.
* .commerr:
* errcode returned by user defined IIC functions if DS3231_ERR_COMM.
*
* Note:
*********************************************************************************************************
*/
DS3231_ERRCODE DS3231_GetReg(DS3231REG_ADDR reg,unsigned char *rst){
DS3231_ERRCODE err = {0};
unsigned char commerr;
regCheck();
if((commerr = IIC_SendByte(DS3231_CALLADDR,(unsigned char)reg)) == 0 && // 寫入寄存器指針
(commerr = IIC_ReadByte(DS3231_CALLADDR,rst)) == 0){ // 然後讀取一個字節
err.errcode = DS3231_ERR_NULL;
}else{
err.errcode = DS3231_ERR_COMM;
}
err.commerr = commerr;
return err;
}
/*
*********************************************************************************************************
* DS3231_SetReg()
*
* Description : set a register of DS3231.
*
* Arguments : reg the register to get value.
* rst return value of result.
*
* Return : .errcode:
* DS3231_ERR_NULL if success.
* DS3231_ERR_COMM if error.
* DS3231_ERR_REG if unknown register.
* .commerr:
* errcode returned by user defined IIC functions if DS3231_ERR_COMM.
* Note:
*********************************************************************************************************
*/
DS3231_ERRCODE DS3231_SetReg(DS3231REG_ADDR reg,unsigned char value){
DS3231_ERRCODE err = {0};
unsigned char commerr;
regCheck();
Sendbuf[0] = (unsigned char)reg;
Sendbuf[1] = value;
if((commerr = IIC_SendBurst(DS3231_CALLADDR,Sendbuf,2)) == 0)
err.errcode = DS3231_ERR_NULL;
else
err.errcode = DS3231_ERR_COMM;
err.commerr = commerr;
return err;
}
/*
*********************************************************************************************************
* DS3231_GetRegs()
*
* Description : get sereval registers' value of DS3231.
*
* Arguments : reg the first register to get value.
* pBuf return value of register.
* len how many registers to get value (1 - (DS3231REG_ADDR_MAX + 1))
*
* Return : .errcode:
* DS3231_ERR_NULL if success.
* DS3231_ERR_COMM if error.
* DS3231_ERR_REG if unknown register.
* DS3231_ERR_ARG if len out of range.
* .commerr:
* errcode returned by user defined IIC functions if DS3231_ERR_COMM.
* Note:
*********************************************************************************************************
*/
DS3231_ERRCODE DS3231_GetRegs(DS3231REG_ADDR reg,unsigned char *pBuf,unsigned short len){
DS3231_ERRCODE err = {0};
unsigned char commerr;
regCheck();
lenCheck();
if((commerr = IIC_SendByte(DS3231_CALLADDR,(unsigned char)reg)) == 0 && // 寫入寄存器指針
(commerr = IIC_ReadBurst(DS3231_CALLADDR,pBuf,len)) == 0){ // 然後讀取一個字節
err.errcode = DS3231_ERR_NULL;
}else{
err.errcode = DS3231_ERR_COMM;
}
err.commerr = commerr;
return err;
}
/*
*********************************************************************************************************
* DS3231_SetRegs()
*
* Description : set sereval registers' value of DS3231.
*
* Arguments : reg the first register to set value.
* pBuf point to the value of registers to set.
* len how many registers to set value (1 - (DS3231REG_ADDR_MAX + 1))
*
* Return : .errcode:
* DS3231_ERR_NULL if success.
* DS3231_ERR_COMM if error.
* DS3231_ERR_REG if unknown register
* DS3231_ERR_ARG if len out of range.
* .commerr:
* errcode returned by user defined IIC functions if DS3231_ERR_COMM.
*
* Note:
*********************************************************************************************************
*/
DS3231_ERRCODE DS3231_SetRegs(DS3231REG_ADDR reg,unsigned char *pBuf,unsigned short len){
DS3231_ERRCODE err = {0};
unsigned char commerr;
regCheck();
lenCheck();
Sendbuf[0] = (unsigned char)reg;
memcpy(Sendbuf+1,pBuf,len);
if((commerr = IIC_SendBurst(DS3231_CALLADDR,Sendbuf,len + 1)) == 0){ // 寫入寄存器指針
err.errcode = DS3231_ERR_NULL;
}else{
err.errcode = DS3231_ERR_COMM;
}
err.commerr = commerr;
return err;
}
/*
*********************************************************************************************************
* DS3231_SetTime()
*
* Description : set time of DS3231.
*
* Arguments : val the time to set
*
* Return : .errcode:
* DS3231_ERR_NULL if success.
* DS3231_ERR_COMM if error.
* .commerr:
* errcode returned by user defined IIC functions if DS3231_ERR_COMM.
* Note:
*********************************************************************************************************
*/
DS3231_ERRCODE DS3231_SetTime(pTIME_STRUCT val){
return DS3231_SetRegs(RegAddr_Sec,(unsigned char *)val,sizeof(TIME_STRUCT));
}
/*
*********************************************************************************************************
* DS3231_GetTime()
*
* Description : get time of DS3231.
*
* Arguments : rst the time result.
*
* Return : .errcode:
* DS3231_ERR_NULL if success.
* DS3231_ERR_COMM if error.
* .commerr:
* errcode returned by user defined IIC functions if DS3231_ERR_COMM.
* Note:
*********************************************************************************************************
*/
DS3231_ERRCODE DS3231_GetTime(pTIME_STRUCT rst){
return DS3231_GetRegs(RegAddr_Sec,(unsigned char *)rst,sizeof(TIME_STRUCT));
}
/*
*********************************************************************************************************
* DS3231_GetTemp()
*
* Description : get temperature measured by DS3231.
*
* Arguments : rst return the temperature measured.
* = (rst->integral.DATA).(rst->fractional.DATA * 0.25)
* for example:
* if rst->integral.DATA = -4, rst->fractional.DATA = 3
* then temperature = -4.75 C
* if rst->integral.DATA = 25, rst->fractional.DATA = 1
* then temperature = +25.25 C
*
* Return : .errcode:
* DS3231_ERR_NULL if success.
* DS3231_ERR_COMM if error.
* .commerr:
* errcode returned by user defined IIC functions if DS3231_ERR_COMM.
* Note : 1. DS3231 will measure temperature every 64 seconds once powered
* by Vcc or once communicated when powerd by battery.
* 2. you can also start the convertion by set CONV in Control
* register.
*********************************************************************************************************
*/
DS3231_ERRCODE DS3231_GetTemp(pTEMP_STRUCT rst){
return DS3231_GetRegs(RegAddr_TempMSB,(unsigned char *)rst,sizeof(TEMP_STRUCT));
}DS3231_G/SetReg(s)對DS3231寄存器讀寫操作進行封裝。
模塊要求用戶按照要求提供錯誤碼風格的IIC通訊函數，並在發生通訊錯誤時把用戶函數的錯誤碼一同返回。
由於時間和溫度的使用較頻繁，提供了專門的讀寫函數。
下面給出代碼示例：
示例代碼
#include <hidef.h> /* common defines and macros */
#include "derivative.h" /* derivative-specific definitions */
#include "DS3231Driver.h"
#include "IIC.h"
#include <stdio.h>
typedef void (*near tIsrFunc)(void);
const tIsrFunc _vect @0xFFC0 = IIC_ISR;
#define BUS_CLOCK 32000000
void Delay(void) {
unsigned int i,j;
for(i = 0; i < 100; i++)
for(j = 0; j < 50000; j++)
;
}
void INIT_PLL(void)
{
CLKSEL &= 0x7f; //set OSCCLK as sysclk
PLLCTL &= 0x8F; //DisaKble PLL circuit
CRGINT &= 0xDF;
#if(BUS_CLOCK == 40000000)
SYNR = 0x44;
#elif(BUS_CLOCK == 32000000)
SYNR = 0x43;
#elif(BUS_CLOCK == 24000000)
SYNR = 0x42;
#endif
REFDV = 0x81; //PLLCLK=2×OSCCLK×(SYNR+1)/(REFDV+1)＝64MHz ,fbus=32M
PLLCTL =PLLCTL|0x70; //Enable PLL circuit
asm NOP;
asm NOP;
while(!(CRGFLG&0x08)); //PLLCLK is Locked already
CLKSEL |= 0x80; //set PLLCLK as sysclk
}
char strbuf[100];
volatile TIME_STRUCT time;
volatile TEMP_STRUCT temp;
unsigned char* flag = (unsigned char*)0x3F80;
void main(void) {
// 18年5月11日星期五23點59分50秒
time.year.year_td = 1; time.year.year_sd = 8;
time.cmon.mon_td = 0; time.cmon.mon_sd = 5;
time.date.date_td = 1; time.date.date_sd = 1;
time.day.day = 5; time.hour.SYS24.is12sys = 0;
time.hour.SYS24.hour_td = 2; time.hour.SYS24.hour_sd = 3;
time.min.min_td = 5; time.min.min_sd = 9;
time.sec.sec_td = 5; time.sec.sec_sd = 0;
INIT_PLL();
IIC_Init();
DS3231_Init();
EnableInterrupts;
// 每次首次上電時設置當前時間
if(*flag != 0xac){
if(DS3231_SetTime(&time).errcode != DS3231_ERR_NULL)
while(1);
*flag = 0xac; // RAM中的數據在保持上電狀態時即使系統重置也不會重置，但在上電重置時會重置
}
for(;;) {
// 讀取當前時間和溫度，出任意錯則無限循環停止運行
if(DS3231_GetTime(&time).errcode != DS3231_ERR_NULL)
while(1);
if(DS3231_GetTemp(&temp).errcode != DS3231_ERR_NULL)
while(1);
sprintf(strbuf,"year:%d%d month:%d%d date:%d%d day:%d,%d%d:%d%d:%d%d\r\nTemp:%d.%02d\r\n",
time.year.year_td,time.year.year_sd,time.cmon.mon_td,time.cmon.mon_sd,
time.date.date_td,time.date.date_sd,time.day.day,
time.hour.SYS24.hour_td,time.hour.SYS24.hour_sd,
time.min.min_td,time.min.min_sd,time.sec.sec_td,time.sec.sec_sd,
temp.integral.DATA,temp.fractional.DATA * 25);
Delay();
}
}
// 實現驅動要求的函數
unsigned char IIC_ReadBurst(unsigned char calAddr,unsigned char *pBuf,unsigned short len){
return IIC_Recv(calAddr,pBuf,len);
}
unsigned char IIC_SendBurst(unsigned char calAddr,unsigned char *pBuf,unsigned short len){
return IIC_Send(calAddr,pBuf,len);
}
unsigned char IIC_ReadByte(unsigned char calAddr,unsigned char *rst){
return IIC_RecvChar(calAddr,rst);
}
unsigned char IIC_SendByte(unsigned char calAddr,unsigned char val){
return IIC_SendChar(calAddr,&val);
}測試結果
後記
這次對DS3231進行了簡單的封裝，難免會有不足或者錯誤之處，敬請指出。
測試中使用的IIC函數是自己封裝的MC9S12XEP100的IIC模塊，正在完善中，應該馬上就會放出。
要求用戶提供IIC函數是爲了實現與硬件解耦，這樣不管實際平臺是怎麼樣的，用戶只要按照要求實現IIC通訊函數就可以使用這個驅動了。
簡介中完全參考Maxim的數據手冊。