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Guest
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| 1-wire |
 Posted: Wed Mar 23, 2005 4:08 pm |
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Hi !
I'd like to use the DS2480 or DS2490 or DS1481 1-Wire for a project.
Could anybody provide me some C code?
Many thanks. |
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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Posted: Thu Mar 24, 2005 12:18 pm |
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Look at EX_TOUCH.C in the examples file. It shows how to use Dallas one-touch devices in general. You will have to write your own drivers for specific chips.
_________________
The search for better is endless. Instead simply find very good and get the job done. |
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global
Joined: 01 Feb 2005
Posts: 21
Location: Paris
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| 1-wire DS2411 |
| Posted: Fri Mar 25, 2005 2:27 am |
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Hi,
i have this program which uses 1-wire, and it gives :
| Quote: | | DS2411_DATA = aab7dfaeb6af5555 |
In the datasheet, it indicates that if the CRC matches the last 8 bits of the registration number, the transmission is error free.
I think here it is not good, could someone tell me what is wrong in there ?
| Code: |
#include <header.h>
/*******************************************************************************
****************************** Functions prototypes ****************************
*******************************************************************************/
void main (void);
void init(void);
int8 Reset(void);
void Write1(void);
void Write0(void);
int8 Readx(void);
void WriteByte(int Data);
int8 ReadByte(void);
byte ROM_BUFFER[8]; //ROM Code Buffer
/*******************************************************************************
************************************** main ************************************
*******************************************************************************/
void main(void)
{
init();
while(1)
{
byte i;
if(!Reset())
{
WriteByte(0x33);
for(i = 0; i < 8; i++)
{
ROM_BUFFER[i] = ReadByte();
}
printf("\nDS2411_DATA = %x%x%x%x%x%x%x%x",ROM_BUFFER[7], ROM_BUFFER[6],ROM_BUFFER[5],
ROM_BUFFER[4], ROM_BUFFER[3], ROM_BUFFER[2], ROM_BUFFER[1], ROM_BUFFER[0]);
//printf("\nCRC_DATA = %x", ROM_BUFFER[0]);
//printf("\nFAMILY_CODE_DATA = %x", ROM_BUFFER[7]);
delay_ms(2000);
}
}
}
/*
DS2411_DATA = b7dfaeb6af55
CRC_DATA = 55
FAMILY_CODE_DATA = aa
DS2411_DATA = adf7ebab6fd5
CRC_DATA = 55
FAMILY_CODE_DATA = aa
*/
/*******************************************************************************
********************************** Initialization ******************************
*******************************************************************************/
void init(void)
{
output_low(DS2411_IO);
}
/*******************************************************************************
*************************************** Reset **********************************
*******************************************************************************/
int8 Reset(void)
{
int8 result=0;
output_low(DS2411_IO); // Drives DQ low
delay_us(480);
output_high(DS2411_IO); // Releases the bus
delay_us(60);
// Sample and return the Presence Detect
result=input(DS2411_IO) & 0x01;
delay_us(240);
return result;
}
/*******************************************************************************
*************************************** Write1 *********************************
*******************************************************************************/
void Write1(void)
{
output_low(DS2411_IO); // Drives DQ low
delay_us(1);
output_high(DS2411_IO); // Releases the bus
delay_us(59);
}
/*******************************************************************************
*************************************** Write0 *********************************
*******************************************************************************/
void Write0(void)
{
output_low(DS2411_IO); // Drives DQ low
delay_us(55);
output_high(DS2411_IO); // Releases the bus
delay_us(5);
}
/*******************************************************************************
**************************************** Readx *********************************
*******************************************************************************/
int8 Readx(void)
{
int8 result=0;
output_low(DS2411_IO); // Drives DQ low
delay_us(1);
output_high(DS2411_IO); // Releases the bus
delay_us(14);
result=input(DS2411_IO) & 0x01;
delay_us(45);
return result;
}
/*******************************************************************************
************************************* WriteByte ********************************
*******************************************************************************/
void WriteByte(int8 Data)
{
int8 loop;
for(loop = 0;loop < 8;loop++)
{
// 0x01,0x02,0x04,0x08,0x10,etc.
if(Data&(0x01 << loop)) Write1();
else Write0();
}
}
/*******************************************************************************
************************************** ReadByte ********************************
*******************************************************************************/
int8 ReadByte(void)
{
int8 loop;
int8 result=0;
for(loop = 0;loop < 8;loop++) result = result + (Readx() << loop);
return result;
}
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jds-pic
Joined: 17 Sep 2003
Posts: 205
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global
Joined: 01 Feb 2005
Posts: 21
Location: Paris
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| Posted: Tue Mar 29, 2005 9:32 am |
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| Thanks for the links ! I'll do what i can |
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