//--------------------------------------------------------------------
#define uchar unsigned char
#define uint unsigned int
#define success 1
#define failure 0
sbit ACC0 = ACC^0;
sbit ACC7 = ACC^7;
typedef struct {
unsigned char second;
unsigned char minute;
unsigned char hour;
unsigned char date;
unsigned char month;
unsigned char week;
unsigned char year;
} TIME;
extern TIME idata g_time;
/*********************************************************************/
// 当前时间格式为: 秒 分 时 日 月 星期 年
uchar code time_init[]={0x40,0x04,0x16,0x09,0x02,0x04,0x06};
//--------------------------------------------------------------------
void init_ds1302(void)
{
T_RST = 0;
T_CLK = 0;
T_RST = 1;
}
//--------------------------------------------------------------------
void stop_ds1302(void)
{
T_CLK = 1;
T_RST = 0;
}
//********************************************************************
void write_byte_ds1302(unsigned char l_data) // 1100us
{
uchar i;
ACC = l_data;
for(i=8; i>0; i--)
{
T_IO = ACC0;
T_CLK = 1;
T_CLK = 0;
ACC = ACC >> 1; // 2us
}
}
//********************************************************************
unsigned char read_byte_ds1302(void)
{
uchar i;
for(i=8; i>0; i--)
{
ACC = ACC >> 1;
if(ACC&0x01) // 2us
ACC |= 0x80; // 1us
ACC7 = T_IO; // 3us
T_CLK = 1;
T_CLK = 0;
}
return ACC;
}
//-----------------------------------------------------------
void cancle_ds1302_wp(void)
{
init_ds1302();
write_byte_ds1302(0x8e); // 地址，命令数?
write_byte_ds1302(0x00); // 写1Byte?
stop_ds1302();
}
//-----------------------------------------------------------
void set_ds1302_wp(void)
{
init_ds1302();
write_byte_ds1302(0x8e); // 地址，命令
write_byte_ds1302(0x80); // 写1Byte数据
stop_ds1302();
}
//********************************************************************
void read_time_ds1302_burst(void)
{
init_ds1302();
write_byte_ds1302(0xbf); // 0xbf:时钟多字节读命令
g_time.second = read_byte_ds1302();
g_time.minute = read_byte_ds1302();
g_time.hour = read_byte_ds1302();
g_time.date = read_byte_ds1302();
g_time.month = read_byte_ds1302();
g_time.week = read_byte_ds1302();
g_time.year = read_byte_ds1302();
stop_ds1302();
}
/********************************************************************
* 说明: 先写地址，后写数据(时钟多字节方式)
* 输入: pSecDa: 时钟数据地址 格式为: 秒 分 时 日 月 星期 年 控制
* 7Byte (BCD码) + 1Byte(控制字)
***********************************************************************/
void set_time_ds1302_burst(void *pSecDa)
{
uchar i;
cancle_ds1302_wp();
init_ds1302();
write_byte_ds1302(0xbe); // 0xbe:时钟多字节写命令
for(i=0; i<8; i++)
{
write_byte_ds1302(*(uchar*)pSecDa);
((uchar*)pSecDa)++;
}
stop_ds1302();
}
/********************************************************************
* 说明: 先写地址，后写命令/数据?
* Address: 0<-->31
* Command = (1 1 x x x x x 0)0xc0|(address<<1)
***********************************************************************/
void write_one_byte_ds1302(unsigned char Address, unsigned char Data)
{
cancle_ds1302_wp();
init_ds1302();
write_byte_ds1302(0xc0|(Address<<1)); /* 写地址，命令 */
write_byte_ds1302(Data); /* 写1Byte数据*/
stop_ds1302();
set_ds1302_wp();
}
/********************************************************************
* 说明: 先写地址，后读命令/数据
* Address: 0<-->31
* 1 1 x x x x x 1
* Command = (1 1 x x x x x 1)0xc1|(address<<1)
***********************************************************************/
unsigned char read_one_byte_ds1302(unsigned char Address)
{
unsigned char rtn_value;
if(Address>30)
Address -= 30;
init_ds1302();
write_byte_ds1302(0xc1|(Address<<1)); /* 写地址，命令 */
rtn_value = read_byte_ds1302(); /* 读1Byte数据 */
stop_ds1302();
return(rtn_value);
}
/********************************************************
* 说明: 先写地址，后读命令/数据 涓流充电]
* command 0x90(write) 0x91(read)
* tcs ds ds rs rs
* (1 0 1 0) 0 1 0 1 0xa5 Imax = (5-0.7)/2k = 2.2MA
***********************************************************************/
//void trickle_ds1302(unsigned char ds, unsigned char rs)
void trickle_ds1302(void)
{
volatile uchar i;
cancle_ds1302_wp();
init_ds1302();
i=0;
write_byte_ds1302(0x90); /* 写地址，命令 */
//write_byte_ds1302(0xa0|((ds&0x03)<<2)|(rs&0x03)); /* 读1Byte数据 */
i = 1;
write_byte_ds1302(0xa5); /* 读1Byte数据 */
i = 2;
stop_ds1302();
set_ds1302_wp();
}
/**********************************************************************
* 说明: 先写地址，后读命令/数据 涓流充电]
* Imax = (5-0.7)/2k = 2.2MA
***********************************************************************/
bit initiate_ds1302(void)
{
unsigned char value;
value = read_one_byte_ds1302(29);
if(value == 0xaa)
{
value = read_one_byte_ds1302(30);
if(value == 0x55)
return (success);
}
cancle_ds1302_wp();
init_ds1302();
write_byte_ds1302(0x80); // start clock (1)
write_byte_ds1302(0x00);
write_byte_ds1302(0x84); // set pm (2)
write_byte_ds1302(0x00);
write_byte_ds1302(0x90); // set trickle (3)
write_byte_ds1302(0xa5);
stop_ds1302();
set_ds1302_wp();
set_time_ds1302_burst(time_init);// initinal time (4)
write_one_byte_ds1302(29,0xaa);
write_one_byte_ds1302(30,0x55);
value = read_one_byte_ds1302(29);
if(value == 0xaa)
{
value = read_one_byte_ds1302(30);
if(value == 0x55)
return (success);
else
return (failure);
}
else
return (failure);
}
//---------------------------------------------------------------------
修改时间，我调用的是write_one_byte_ds1302(unsigned char Address, unsigned char Data);不知道对不对，如果我想修改年份 Address 应该是多少？实在不解，还望各位大虾指教！ |
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