STK600 之 Atmega128硬件I2C 讀寫高精度時鐘芯片DS3231函數(shù)

STK600 用于程序的下載 連接JTAG口至mega128目標(biāo)板即可
//-----------------------------------------------------------------------------
unsigned char DS3231_DATA[19] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,};
unsigned char Date_Data[14] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00};
unsigned char Data_temp[6] = {0x00,0x00,0x00,0x00,0x00,0x00};
unsigned char Buffer_Data[20] = {0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,
0x2C,0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,};


void DS3221_initial(void)
{
DS3231_RESETH;
DS3231_RESETL;
delay_ms(300);
DS3231_RESETH;
}

void twi_start_state(void)
{
TWCR = TWCR | 0xA4;
twi_intcheck();
}

void twi_stop_state(void)
{
TWCR = TWCR | 0x94;
TWCR = TWCR | 0x84;
}


void twi_slaw(unsigned char address)
{
address = address << 1;
TWDR = address;
TWCR = TWCR & 0xDF;
TWCR = TWCR | 0x84;
}

void twi_slar(unsigned char address)
{
address = address << 1;
address = address | 0x01;
TWDR = address;
TWCR = TWCR & 0xDF;
TWCR = TWCR | 0x84;
}


void twi_wordadd_write(unsigned char address)
{
TWDR = address;
TWCR = TWCR & 0xDF;
TWCR = TWCR | 0x84;
}

void twi_datawrite(unsigned char data)
{
TWDR = data;
TWCR = TWCR | 0x84;
}

unsigned char twi_dataread(void)
{
unsigned char temp_a;

twi_intcheck();
temp_a = TWDR;
return temp_a;
}

void twi_MT(unsigned char sladdress,unsigned char wordaddress,unsigned char *ds3231data,unsigned char datalength)
{
unsigned char temp_a;
unsigned char temp_b;

twi_start_state();
twi_intcheck();
twi_slaw(sladdress);
twi_intcheck();
twi_wordadd_write(wordaddress);
twi_intcheck();

for(temp_a = 0;temp_a < datalength;temp_a++)
{
temp_b = *ds3231data;
twi_datawrite(temp_b);
++ds3231data;
twi_intcheck();
}
twi_intclear();
twi_stop_state();
}

void twi_MR(unsigned char sladdress,
unsigned char wordaddress,
unsigned char *ds3231data,
unsigned char datalength)
{
unsigned char temp_a;

twi_start_state();
twi_intcheck();
twi_slar(sladdress);
twi_intcheck();
twi_intclear();

for(temp_a = 0;temp_a < datalength;temp_a++)
{
*ds3231data = twi_dataread();
++ds3231data;
twi_intclear();
}
twi_stop_state();
}

void twi_MTR(unsigned char sladdress,
unsigned char wordaddress,
unsigned char *ds3231data,
unsigned char datalength)
{
unsigned char temp_a;

twi_start_state();
twi_intcheck();
twi_slaw(sladdress);
twi_intcheck();
twi_wordadd_write(wordaddress);
twi_intcheck();
twi_start_state();
twi_intcheck();
twi_slar(sladdress);
twi_intcheck();
twi_intclear();

for(temp_a = 0;temp_a < datalength;temp_a++)
{
*ds3231data = twi_dataread();
++ds3231data;
if(temp_a < (datalength - 1))
{
twi_intclear();
}
}
twi_intcheck();
TWCR = TWCR & 0xBF;
twi_stop_state();
TWCR = 0x44;
}


void twi_intcheck(void)
{
unsigned char temp_a;

temp_a = TWCR & 0x80;
while(temp_a == 0x00)
{
temp_a = TWCR & 0x80;
}
}


void twi_intclear(void)
{
TWCR = TWCR | 0x84;
}

void DS3231toDate(unsigned char *ds3231data,unsigned char *Datedata)
{
unsigned char temp_a;
for(temp_a = 0;temp_a < 7;temp_a++)
{
*Datedata = *ds3231data & 0x0F;
++Datedata;
*Datedata = *ds3231data >> 4;
++Datedata;
++ds3231data;
}
temp_a = 0;
}

void DS3231TD_set(unsigned char year,
unsigned char month,
unsigned char date,
unsigned char day,
unsigned char hour,
unsigned char minute,
unsigned char second,
unsigned char time_import,
unsigned char *ds3231data)
{
*ds3231data = second;
++ds3231data;
*ds3231data = minute;
++ds3231data;

if(time_import == Time12)
{
if(hour > 0x12)
{
hour = hour - 0x12;
}
else;
*ds3231data = hour | 0x40;
}
else
{
*ds3231data = hour & 0xBF;
}
++ds3231data;

*ds3231data = day;
++ds3231data;

*ds3231data = date;
++ds3231data;

*ds3231data = month;
++ds3231data;

*ds3231data = year;

twi_MT(DS3231address,0x00,&DS3231_DATA[0],7);
}

void temp_convert(unsigned char *temp_data,
unsigned char *ds3231data)
{
unsigned char temp_b;
temp_b = *ds3231data;
if((temp_b & 0x80) > 0)
{*temp_data = negative;}
else
{*temp_data = positive;}
temp_b = temp_b << 1; ?
temp_b = temp_b >> 1;
++temp_data;
*temp_data = temp_b / 100;
++temp_data;
*temp_data = (temp_b % 100) / 10;
++temp_data;
*temp_data = (temp_b % 100) % 10;
++ds3231data;
temp_b = *ds3231data;
temp_b = temp_b >> 6;
temp_b = temp_b * 25;
++temp_data;
*temp_data = temp_b / 10;
++temp_data;
*temp_data = temp_b % 10;
}