/***************************************************************************/
/*?DEMO3231.C??????????????????????????????????????????????????????????????*/
/***************************************************************************/
#include???????????????????????/*?Prototypes?for?I/O?functions?*/
#include??????????????????????/*?Register?declarations?for?DS5000?*/
/*************************?bit?definitions?****************************/
sbit????scl?=?P0^0;?????????????/*?I2C?pin?definitions?*/
sbit????sda?=?P0^1;
sbit????E?=?P1^0;???????????????/*?DCM?LCD?module?control?signal?definitions?*/
sbit????RS?=?P1^1;
sbit????RW?=?P1^2;
sbit????CLK?=?P2^5;?????????????/*?DS1267?control?signal?definitions?*/
sbit????RSTb?=?P2^6;
sbit????DQ?=?P2^7;
sbit????int0?=?P3^2;
/****************************?defines?*******************************/
#define?ADDRTC??0xd0????/*?DS3231?slave?address?（write）?*/
#define?ACK?????0
#define?NACK????1
/***********************?Function?Prototypes?**************************/
void????start（）;
void????stop（）;
uchar???i2cwrite（uchar?d）;
uchar???i2cread（char）;
void????wr_dsp_dat（uchar）;
void????wr_dsp_ins（uchar）;
uchar???rd_dsp_ins（）;
void????hex2asc（uchar）;
void????dsp_adj（uchar?pos）;
void????init_dsp（）;
void????writebyte（）;
void????initialize_DS3231（）;
void????disp_regs（）;
void????rd_temp（）;
void????frq_out_tog（）;
void????init_alrm（）;
void????comm_init（）;
/*************************?Global?Variables?***************************/
xdata???uchar???sec?min?hr?dy?dt?mn?yr;
/****************************?functions?******************************/
void?start（）????????????/*?---------?Initiate?start?condition?----------?*/
{
????????sda?=?1;??scl?=?1;
????????sda?=?0;?
}
void?stop（）?????????????/*?----------?Initiate?stop?condition?-----------?*/
{
????????sda?=?0;??sda?=?0;
????????scl?=?1;??scl?=?1;??sda?=?1;
}
uchar?i2cwrite（uchar?d）?????????/*?-----------------------------?*/
{
uchar?i;

????????scl?=?0;
????????for?（i?=?0;i?????????{
????????????????if?（d?&?0x80）
????????????????????????sda?=?1;?/*?Send?the?msbits?first?*/
????????????????else
????????????????????????sda?=?0;
????????????????scl?=?0;
????????????????scl?=?1;
????????????????d?=?d?<????????????????scl?=?0;
????????}
????????sda?=?1;????????/*?Release?the?sda?line?*/
????????scl?=?0;
????????scl?=?1;
????????i?=?sda;
????????if?（i）?printf（“Ack?bit?missing??%02X\n“（unsigned?int）d）;
????????scl?=?0;
????????return（i）;
}
uchar?i2cread（char?b）???/*?-----------------------------------?*/
{
uchar?i?d;

????????d?=?0;
????????sda?=?1;?????????????/*?Let?go?of?sda?line?*/
????????scl?=?0;
????????for?（i?=?0;?i?????????{
????????????????scl?=?1;
????????????????d?=?d?<????????????????d?=?d?|?（unsigned?char）sda;
????????????????scl?=?0;
????????}
????????sda?=?b;??????????/*?low?for?ack?high?for?nack?*/
????????scl?=?1;
????????scl?=?0;

????????sda?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????37376??2014-08-17?23:41??應用筆記3506.doc

?????文件?????108638??2014-08-17?23:35??3506Fig02.pdf

?????文件??????15325??2014-08-17?23:32??AN3506_software.c

?????文件????1484415??2014-08-17?23:37??DS3231_cn.pdf

-----------?---------??----------?-----??----

??????????????1645754????????????????????4