one wire communication

[lucky]

Hi..

   I am trying to interface DS2433 with 8051. i have written code according to protocol but i am not able to write data into EEPROM can any one help me…..

 

Thanks &Regards,

lucky

[lucky]

Hi,

 

 

 

void main()

 {

  unsigned char i,dat[5];

reset();

write_byte(0xCC); //skip rom command

write_byte(0x0F); //write scratchpad

write_byte(0x00);   //TA1 – data

  write_byte(0x00);   //TA2 – data

  write_byte(10);   //data to memory location 0x10

  write_byte(14); 

reset();

write_byte(0xCC);   //skip rom command

write_byte(0xAA); //read scratchpad command

for(i=0;i<5;i++)

{

dat=read_byte(); 

}

reset();

write_byte(0xCC); //skip rom command

write_byte(0x55); //copy scratchpad

write_byte(0x00);   //TA1 – data

  write_byte(0x00);   //TA2 – data

write_byte(0x01); //ending off set

ms_delay(5);

reset();

// while(1);

 }

 

void reset(void)

 {

  unsigned char presence;

write0();

  ms_delay(500);   //480

  write1();

  ms_delay(80); //70

  presence = read_bit();

  ms_delay(420);   //410

  write1(); //– not required

 }

 

void write_byte(unsigned char w_buff)

 {

unsigned char w_cnt = 0;

// P3=w_buff;

while(w_cnt<

{

// P2=w_buff;

if(w_buff & 0x01) //to send LSB first

{

  write1();

}

else

 {

  write0();

 }

w_buff = w_buff >> 1;

w_cnt++;

}

 }

 

unsigned char read_byte(void)

 {

unsigned char temp=0,r_cnt=0,r_buff;

while(r_cnt<

{

temp = read_bit();

if(temp)

{

 r_buff |= 1;

}

r_buff=r_buff << 1;

r_cnt++;

}

P3=r_buff;

return(r_buff); 

 }

 

void write0(void)

 {

ds=0;

ms_delay(70);  //actual delay 60us

    ds=1;

ms_delay(10);

 }

 

void write1(void)

 {

  ds=0;

ms_delay(10);  //actual delay 6us

ds=1;

ms_delay(65);  //actual delay 54us

 }

 

unsigned char read_bit(void)

 {

  unsigned char result;

ds=0;

ms_delay(10);   //actual delay 6us

ds=1;

ms_delay(19);   //actual dealay 11us

result=ds;

ms_delay(60);   //sctual delay 45us

return(result);

 }

 

this is my code for writing data into memory, coming to circuit iam using proteus..in that i was connected data pin of eeprom to port pin and i was connected a pullup to that wire…..

 

 

[romel emperado]

you can also try the i2c the two wire interface eeprom if you want..

 

here are some tutorials:

 

http://adf.ly/2Gxqm

 

http://adf.ly/2Gy5n

[lucky]

Ok,

i will try with proper hardware… 

 

Thanks & Regards,

lucky

[lucky]

Here in one wire communication , i need to give delay in microseconds like some times i need to provide 10 micro seconds delay ,Is it possible to produce such a delays…

[dagakshay]

yes you can provide a mini of 1.085 micro second delay uing 8051 timers….

[Author]

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