I2C interfacing prob

Status
Not open for further replies.
S

sanjoy

Member
In my project im working with PIC16f876A &ds3232. while Acquiring data from ds3232, it seems PIC cannot able to read from ds3232.
In proteus VSM debugging, it is seen that the registers of ds3232 did not copy the initialize values that i ve given in mikroC program.
in a simplified model of project, The PORTB cannot produce the required value.
If u have some time to spear, pls go through the program and simulation and let me know the possible cause of the problems.
Thanks
 

Attachments

  • Program_rev.rar
    33.8 KB · Views: 209
First question is the I2C connections , pullups etc, as i cannot open .rar files what slave address are you using for DS3232 ?
 
10,9,8,7...... Using analogue resistors.... replace the two 2k2 I2C bus resistors to "Pullup" and it should work
 
Ian Rogers said:
10,9,8,7...... Using analogue resistors.... replace the two 2k2 I2C bus resistors to "Pullup" and it should work
Click to expand...
Thanks for reply. To enable weak pull-ups, appropriate TRIS bit(s)=1, and RBPU bit (OPTION_REG<7>)=0; TRIS bits of port B. but SCL &SDA ports are on RC3, RC4 respectively . so how the program should be written here..
 
sanjoy said:
Thanks for reply. To enable weak pull-ups, appropriate TRIS bit(s)=1, and RBPU bit (OPTION_REG<7>)=0; TRIS bits of port B. but SCL &SDA ports are on RC3, RC4 respectively . so how the program should be written here..
Click to expand...
No! its for simulation only... Analogue resistors do not work... You must replace them in the schematic for digital pullup.. In the real world the 2k2's will be fine..
 
Ian Rogers said:
No! its for simulation only... Analogue resistors do not work... You must replace them in the schematic for digital pullup.. In the real world the 2k2's will be fine..
Click to expand...
how digital pullup is employed here.. pls give me some hints..
 
Last edited:
Okay.... In the real world the SDA and the SCK are pulled high by resistors 2k2 ~ 10k.. In ISIS they are too noisy and add far too much processing time... Using a digital simulator make the I2C bus work...
 
Ian Rogers said:
Okay.... In the real world the SDA and the SCK are pulled high by resistors 2k2 ~ 10k.. In ISIS they are too noisy and add far too much processing time... Using a digital simulator make the I2C bus work...
Click to expand...
digital simulator ---it might be in the I2C debugger in instrument options of Proteus
 
wow it worked. ds3232 is getting initialize data as programmed. thanks for great help. it wd be impossible to find without ur advice.
 
Status
Not open for further replies.

Similar threads

A
  • Question
ASM: i2c software headache
2 3
Replies
58
Views
8K
augustinetez
A
F
  • Question
Issue with Interfacing LCD with PIC16F877A
2
Replies
22
Views
3K
Farhaad
F
A
  • Question
MSP430G2553 issue in Transistor interfacing
Replies
14
Views
2K
danadak
G
  • Question
PIC16F877AA - NON-CONTACT THERMOMETER
Replies
9
Views
2K
rjenkinsgb
B
I2C, ADC, LCD, pic18f258
Replies
14
Views
2K
Ian Rogers
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…