愛普生EPSON實時時鐘芯片-RX8900SA

• 一、引腳連接
• 二、使用方法
• • 寄存器配置
  • • 1.實時時間讀取/設置
    • 2.鬧鐘時間讀取/設置
• 三、代碼
• • "Rx8900sa.c文件"
  • "Rx8900sa.h文件"

一、引腳連接

近期由于項目需求，被指定使用一款實時時鐘芯片RX8900SA，經查詢后發現網絡資源很少，便在此記錄一下使用筆記，方便查詢使用，附代碼。后期發現愛普生的RX8025t芯片手冊內容相近，資源多且有中文手冊，可對比查看。


芯片采用I2C通訊方式，具體時序查看芯片應用手冊，常用的引腳如下：
SDA/SCL：用于I2C通訊；
/INT：用于鬧鐘報警，正常狀態時是高電平，中斷發生后，引腳電平由 高3V->低；
Vbat：連接電池；

二、使用方法

寄存器配置

1.芯片寄存器一共有15個，00~06用來設置和讀取實時時間，數據格式為BCD碼，需要注意的是03WEEK寄存器數據格式是不一樣的，每個位對應周幾（不許進行BCD碼轉換）；
2.08~0A是用來對定時鬧鐘的時間配置，鬧鐘配置有兩種方式具體操作在下面；
3.0D~0F是控制寄存器，用來設定中斷方式、定時方式、中斷標志位等；

1.實時時間讀取/設置

1.設備地址為64，想要寫入相應的寄存器，需要先發設備地址，然后寄存器地址，然后數值，比如WriteByteAdd(Rx8900sa_ADD,15,0x08); //使能alarm中斷信號AIE；
2.讀取相應的寄存器，需要先發設備地址，然后相應的寄存器，比如typGetAlarmTime.AF=ReadByteAdd(Rx8900sa_ADD,14);//讀取中斷標志寄存器，AF在第3位,0開始計數。

2.鬧鐘時間讀取/設置

開啟鬧鐘定時報警功能（即到點兒/INT引腳就由高變低），主要分兩步：
1.設置定時時間，鬧鐘最小定時時間為分鐘，設置不到秒，最大設置時間為日，若想要更長時間的定時，添加應用代碼即可，分鐘/小時時間設置向08/09寄存器寫入數值即可，數值80h~FFh中及代表忽略（即每一分鐘或者每小時）；這里比較特殊的是day和week的定時，時間設置在0A寄存器，但需要使用0D寄存器的WADA位來控制，0代表周時間報警，1代表日時間報警，0A寄存器數據格式最高位為1的話表示每一天。
2.設置2個寄存器（0D,0F）,清除1個中斷標志位；0D Extension Register寄存器中第6位WADA用來控制按照day設定的時間報警，還是用week設定的時間報警，0F Control Register寄存器的第3位AIE是用來使能鬧鐘定時中斷，因此在初始化的時候需要對該為寫1；1個中斷標志位是0E Flag Register寄存器的第3位AF，在初始化的時候需要進行清0，當定時時間到，中斷發生，該標志位置1，/INT引腳電平由3V->0V，清零該標志位后便可進行下一次定時報警，不清除不再會觸發定時報警。

三、代碼

“Rx8900sa.c文件”

其中包括一些延時函數，用于自己的開發環境中重新定義一下即可，這里的OS.h主要用來設定延時函數
代碼片.

/************************************************* File name: //Rx8900sa.c/h Author： //Davidysw Version: //V1.0 Description: //用于驅動Rx8900sa實時時鐘芯片 // 讀取秒、分、時、周、日、月、年// 設定鬧鐘分、時、日 Others: // 具體操作查看應用手冊 Log: // *************************************************/ #include <msp430.h> #include "OS.h" #include "Rx8900sa.h"TIME typNowTime,typSetTime; ALARM typSetAlarmTime,typGetAlarmTime;/* *@ Description: 轉換為BCD碼 *@ param 1 ：例如傳進來的是51，轉換成0x51,實時時鐘存儲的是BCD碼 *@ param 2 *@ return */ uint8_t hex_2bcd(uint8_t s) {uint8_t temp;uint8_t t;s %= 100;temp = s / 10;if(!temp) //如果為0{t = s ;}else{t = temp * 6 + s; //10進制轉16進制，超過10的數*6}return t; }/* *@ Description: 讀取實時時間->typNowTime *@ param 1 *@ param 2 *@ return */ void Rx8900sa_ReadNowTime(void) { uint8_t buff_rd[7];uint8_t i;for(i = 0; i < 7;i ++){buff_rd[i] = ReadByteAdd(Rx8900sa_ADD,i);}typNowTime.second = ((buff_rd[0] >> 4) & 0x07) * 10 + (buff_rd[0] & 0x0f);typNowTime.minute = ((buff_rd[1] >> 4) & 0x07) * 10 + (buff_rd[1] & 0x0f);typNowTime.hour = ((buff_rd[2] >> 4) & 0x03) * 10 + (buff_rd[2] & 0x0f);//typNowTime.week = ((buff_rd[3] >> 4) & 0x07) * 10 + (buff_rd[3] & 0x0f);typNowTime.day = ((buff_rd[4] >> 4) & 0x03) * 10 + (buff_rd[4] & 0x0f);typNowTime.month = ((buff_rd[5] >> 4) & 0x01) * 10 + (buff_rd[5] & 0x0f);typNowTime.year = ((buff_rd[6] >> 4) & 0x0f) * 10 + (buff_rd[6] & 0x0f);switch(buff_rd[3]){case 0x02:{typNowTime.week=1;}break;case 0x04:{typNowTime.week=2;}break;case 0x08:{typNowTime.week=3;}break;case 0x10:{typNowTime.week=4;}break;case 0x20:{typNowTime.week=5;}break;case 0x40:{typNowTime.week=6;}break;case 0x01:{typNowTime.week=7;}break;default:{typNowTime.week=0;}break;} }/* *@ Description: 設置實時時間->typSetTime *@ param 1 Rx8900sa_SetNowTime(31,0,6,1,18,11,19); *@ param 2 *@ return */ uint16_t Rx8900sa_SetNowTime(uint8_t second,uint8_t minute,uint8_t hour,uint8_t week,uint8_t day,uint8_t month,uint8_t year) { uint8_t i;uint8_t buff_wr[7];static TIME set_time_old;typSetTime.second = second;typSetTime.minute = minute;typSetTime.hour = hour;//typSetTime.week = week;typSetTime.day = day;typSetTime.month = month;typSetTime.year = year;switch(week){case 1:{typSetTime.week=0x02;}break;case 2:{typSetTime.week=0x04;}break;case 3:{typSetTime.week=0x08;}break;case 4:{typSetTime.week=0x10;}break;case 5:{typSetTime.week=0x20;}break;case 6:{typSetTime.week=0x40;}break;case 7:{typSetTime.week=0x01;}break;default:{typSetTime.week=0;}break; }if(typSetTime.second!=set_time_old.second||typSetTime.minute!=set_time_old.minute||typSetTime.hour!=set_time_old.hour||typSetTime.week!=set_time_old.week||typSetTime.day!=set_time_old.day||typSetTime.month!=set_time_old.month||typSetTime.year!=set_time_old.year){buff_wr[0] = hex_2bcd(typSetTime.second);buff_wr[1] = hex_2bcd(typSetTime.minute);buff_wr[2] = hex_2bcd(typSetTime.hour);buff_wr[3] = typSetTime.week;buff_wr[4] = hex_2bcd(typSetTime.day); buff_wr[5] = hex_2bcd(typSetTime.month);buff_wr[6] = hex_2bcd(typSetTime.year);for(i = 0;i < 7; i++){WriteByteAdd(Rx8900sa_ADD,i,buff_wr[i]);delay_ms(5);}set_time_old.second = typSetTime.second;set_time_old.minute = typSetTime.minute;set_time_old.hour = typSetTime.hour;set_time_old.week = typSetTime.week;set_time_old.day = typSetTime.day;set_time_old.month = typSetTime.month;set_time_old.year = typSetTime.year; }return 1; }/* *@ Description: 設置鬧鐘--天設置方式 *@ param 1 ：例如：設置18號6點1分出發鬧鐘報警，則設置Rx8900sa_SetAlarmDay(1,6,18); *@ param 2 *@ return */ uint16_t Rx8900sa_SetAlarmDay(uint8_t minute,uint8_t hour,uint8_t day) {uint8_t i;uint8_t buff_wr[4];typSetAlarmTime.minute = minute;typSetAlarmTime.hour = hour;typSetAlarmTime.day = day;buff_wr[0] = hex_2bcd(typSetAlarmTime.minute);buff_wr[1] = hex_2bcd(typSetAlarmTime.hour);buff_wr[2] = hex_2bcd(typSetAlarmTime.day); for(i = 8;i < 11; i++){WriteByteAdd(Rx8900sa_ADD,i,buff_wr[i-8]);delay_ms(5);}WriteByteAdd(Rx8900sa_ADD,15,0x08);//使能alarm中斷信號AIEdelay_ms(5);WriteByteAdd(Rx8900sa_ADD,13,0x40);//寄存器WADA:1設定day 0：設定week報警delay_ms(5);rx8900sa_ClearAlarmFlag(); //清除報警標志位delay_ms(5);return 1; }/* *@ Description: 設置鬧鐘--周設置方式,WADA=0 *@ param 1 ：例如：設置星期一到星期五6點1分出發鬧鐘報警，則設置Rx8900sa_SetAlarmWeek(1,6,0x3E); *@ param 2 ：week AE Sat Fri Th Wes Tue Mon Sun *@ param 3 0 0 1 1 1 1 1 0 = 0x3E */ uint16_t Rx8900sa_SetAlarmWeek(uint8_t minute,uint8_t hour,uint8_t week) {uint8_t i;uint8_t buff_wr[4];typSetAlarmTime.minute = minute;typSetAlarmTime.hour = hour;typSetAlarmTime.week = week;buff_wr[0] = hex_2bcd(typSetAlarmTime.minute);buff_wr[1] = hex_2bcd(typSetAlarmTime.hour);buff_wr[2] = typSetAlarmTime.week;for(i = 8;i < 10; i++){WriteByteAdd(Rx8900sa_ADD,i,buff_wr[i-8]);delay_ms(5);}WriteByteAdd(Rx8900sa_ADD,10,buff_wr[2]);delay_ms(5);WriteByteAdd(Rx8900sa_ADD,15,0x08);//使能alarm中斷信號AIEdelay_ms(5);WriteByteAdd(Rx8900sa_ADD,13,0x00);//寄存器WADA:1設定day 0：設定week報警delay_ms(5);rx8900sa_ClearAlarmFlag(); //清除報警標志位delay_ms(5);return 1; }/* *@ Description: 清除中斷標志位AF *@ param 1 ：時間到設定鬧鐘時間后觸發報警引腳INT，電平會從高->低，清除標志位AF后，才會進行下次報警 *@ param 2 *@ return */ void rx8900sa_ClearAlarmFlag(void) {WriteByteAdd(Rx8900sa_ADD,14,0x40);//清除中斷標志位AF,第3位AF清除，第6位保持 } /* *@ Description: 讀取芯片鬧鐘寄存器，用于放在循環中做仿真測試使用 *@ param 1 *@ param 2 *@ return */ void Rx8900sa_ReadAlarm(void) { uint8_t buff_rd[3];uint8_t i;for(i = 8; i < 11;i ++){buff_rd[i-8] = ReadByteAdd(Rx8900sa_ADD,i);}typGetAlarmTime.minute = ((buff_rd[0] >> 4) & 0x07) * 10 + (buff_rd[0] & 0x0f);typGetAlarmTime.hour = ((buff_rd[1] >> 4) & 0x03) * 10 + (buff_rd[1] & 0x0f);typGetAlarmTime.day = ((buff_rd[2] >> 4) & 0x03) * 10 + (buff_rd[2] & 0x0f);typGetAlarmTime.week = buff_rd[2];typGetAlarmTime.AF=ReadByteAdd(Rx8900sa_ADD,14);//讀取中斷標志寄存器，AF在第3位,0開始計數typGetAlarmTime.AIE=ReadByteAdd(Rx8900sa_ADD,15);//讀取AIE中斷使能寄存器，AIE在第3位typGetAlarmTime.WADA=ReadByteAdd(Rx8900sa_ADD,13);//讀取WADA中斷使能寄存器，WADA在第6位if((typGetAlarmTime.AF&0x08)!=0) //產生鬧鐘中斷，AF=1{rx8900sa_ClearAlarmFlag();} }uint8_t GetNowtimeSecond(void) {return typNowTime.second; } uint8_t GetNowtimeMinute(void) {return typNowTime.minute; } uint8_t GetNowtimeHour(void) {return typNowTime.hour; } uint8_t GetNowtimeDay(void) {return typNowTime.day; } uint8_t GetNowtimeMonth(void) {return typNowTime.month; } uint8_t GetNowtimeYear(void) {return typNowTime.year; }/**************************** * 以下為I2C相關函數 *****************************//*時鐘線狀態設置*/ void Set_SCL(uint8_t x) {if(x){SCL_H;}else{SCL_L;}delay_us(20); }/*數據線狀態設置*/ void Set_SDA(uint8_t x) {if(x){SDA_H;}else{SDA_L;}delay_us(20); }/*總線狀態初始化*/ void I2Cstart(void)//開始信號 {SDA_OUTPUT;Set_SCL(1);Set_SDA(1);Set_SDA(0);delay_us(20); }/*總線結束*/ void I2Cstop(void) {SDA_OUTPUT;Set_SCL(0);Set_SDA(0);Set_SCL(1);Set_SDA(1); }/*等待從機應答*/ void I2CResponseAck(void) {uint16_t i = 0;Set_SCL(1); SDA_INPUT;while((SDA_X)&&(i<2500)){i++;//如果一段時間內沒有收到應答信號，則認為已正確接收到數據?}Set_SCL(0); }void write_byte(uint8_t data) {uint8_t i;SDA_OUTPUT;for(i=0;i<8;i++){Set_SCL(0);if((data&0x80)!=0) { Set_SDA(1);}else{Set_SDA(0) ; } Set_SCL(1); data=data<<1;}Set_SCL(0); } uint8_t read_byte(void) {uint8_t i,k;Set_SCL(0);SDA_INPUT; for(i=0;i<8;i++){ k=k<<1;Set_SCL(1);if(SDA_X){ k=k|1;}Set_SCL(0);} return k; }/*主機應答回應*/ void I2CSendAck(uint8_t n) {Set_SCL(0);SDA_OUTPUT;if(n){Set_SDA(1);}else{Set_SDA(0);}Set_SCL(1); }/*給IIC設備寫入一個字節*/ void WriteByteAdd(uint8_t iic_add, uint8_t byte_add, uint8_t data) {I2Cstart();write_byte(iic_add);I2CResponseAck();write_byte(byte_add);I2CResponseAck();write_byte(data);I2CResponseAck();I2Cstop(); }/*讀IIC設備一個字節*/ uint8_t ReadByteAdd(uint8_t iic_add, uint8_t byte_add) {uint8_t temp;I2Cstart();write_byte(iic_add);I2CResponseAck();write_byte(byte_add);I2CResponseAck();I2Cstart();write_byte(iic_add|1);I2CResponseAck();temp = read_byte();I2CSendAck(1);I2Cstop();return temp; }

“Rx8900sa.h文件”

代碼片.

#ifndef _RX8900SA_H #define _RX8900SA_H#define uint8_t unsigned char #define uint16_t unsigned int #define uint32_t unsigned long#define Rx8900sa_ADD 0X64typedef struct TIME_type {unsigned char second; //秒unsigned char minute; //分unsigned char hour; //小時unsigned char week; //周unsigned char day; //日unsigned char month; //月unsigned char year; //年 }TIME; extern TIME typNowTime,typSetTime;typedef struct ALARM_type {unsigned char minute; //分unsigned char hour; //小時unsigned char week; //周unsigned char day; //日unsigned char AF; //中斷標志unsigned char AIE; //中斷使能unsigned char WADA; //WADA:1設定day 0：設定week報警 }ALARM; extern ALARM typSetAlarmTime,typGetAlarmTime;// The two-wire I2C bus port #define SCL BIT5 #define SCL_OUTPUT (P3DIR |= SCL) #define SCL_L (P3OUT &=~SCL) #define SCL_H (P3OUT |= SCL)#define SDA BIT7 #define SDA_OUTPUT (P3DIR |= SDA) #define SDA_INPUT (P3DIR &=~SDA) #define SDA_L (P3OUT &=~SDA) #define SDA_H (P3OUT |= SDA) #define SDA_X (P3IN&SDA)extern uint16_t Rx8900sa_SetNowTime(uint8_t second,uint8_t minute,uint8_t hour,uint8_t week,uint8_t day,uint8_t month,uint8_t year); extern uint16_t Rx8900sa_SetAlarmDay(uint8_t minute,uint8_t hour,uint8_t day); extern uint16_t Rx8900sa_SetAlarmWeek(uint8_t minute,uint8_t hour,uint8_t week); extern uint8_t ReadByteAdd(uint8_t iic_add, uint8_t byte_add); extern void WriteByteAdd(uint8_t iic_add, uint8_t byte_add, uint8_t data); extern void Rx8900sa_ReadNowTime(void); extern void Rx8900sa_ReadAlarm(void); extern void rx8900sa_ClearAlarmFlag(void); #endif

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