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Hello

Someone could post a example code of i2c communication using "Stream".

thanks

Hello,
I changed my dspic with a 18f as a slave and it works perfectly.i guess there is some modifications or configuration in the dspic.

Thanks. I did add the NAK parameter to my master-receiver code and my demo program(s) came to life! My slave is running essentially the example slave program. Very simple master program.

I will ...

Master 18F2550
Slave DSpic 30f4012

pcwhd 4.057

Try using an 18F-series PIC for the Slave, instead of the dsPIC.
(Keep the 18F2550 for the Master).

i need to control a motor with dspic

What PIC type are you using for the slave and the master ?

What is your compiler version ?

Master 18F2550
Slave DSpic 30f4012

pcwhd 4.057

1. Use the CCS example code for the Slave.
2. Use the hardware i2c pins (SDA and SCL) on the Slave PIC.
3. Run the Slave PIC at 20 MHz.
4. Make sure you have a ground connection between the Master ...

i2c_start();

i2c_write(0xA0);
i2c_write(0x00);
i2c_start();
i2c_write(0xA1);
data=i2c_read(0);
i2c_stop();

======================

I'm a quasi I2C newbie so put flamethrower on s ...

yes i already did that and worked

PLEASE HELP!!

You are delaying for 100mSec in the 'write' routine, before writing the data. The master expects the data to be there immediately...

Best Wishes

thank you for your answer but, i did that to know ...

i already tryed it and same result

Thanks for your suggestion,

But the problem is that the master doesn't receive data from the slave.

the slave code is frome ex_slave.c from "ccs".

Master code

#include <18F2550.h>

#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
//#fuses HS,NOWDT,NOPROTECT,NOLVP,NODEBUG,VREGEN,PUT
#fuses HS,NOWDT,NOPROTECT ...

On I2C, the device 'address', is the top seven bits of the byte writen immediately after a 'start'. The bottom bit, sets the direction of the following transfer wanted.
So the 'read' code, sends the ...

i2c_start();
i2c_write(0xa0);
i2c_write(0x00);
i2c_start();
i2c_write(0xa1);
data = i2c_read(0);
i2c_stop();

I dont understand why i2c_write(0xa1); what this value 0xa1 ...