I2C problem

aleksander · ‎2008-08-06

Posted on August 07, 2008 at 08:48

I2C problem

aleksander · ‎2011-05-17

Posted on May 17, 2011 at 12:26

I have probles to run I2C2.

When i set START bit in I2C2_CR1 register the pin PB11(I2C2_SDA) goes low, but SB bit is never set in I2C2_SR1.

I2C2Test()

{

while((I2C2_SR2 & 0x02) != 0); //wait for I2C to be free

I2C2_CR1 |= I2C2_CR1_START; //start

while((I2C2_SR1 & 0x01) == 0); // wait for SB

I2C2_DR = DIMMER2_ADDRESS; // Never get to this point

.........

}

Here is Init function :

I2C2Init()

{

I2C2_CR1 = I2C2_CR1_PE | I2C2_CR1_ACK; // turn on I2C and set ACK

I2C2_OAR1 = 0x4001;

I2C2_OAR2 = 0x0000;

I2C2_CCR = 0x028;

I2C2_TRISE = 0x03;

}

Any idea ??

Regards, Aleksander.

lanchon · ‎2011-05-17

Posted on May 17, 2011 at 12:26

hi alex,

I don't have time to check your code, but here is the lowest level of my I2C stack if you want to take a look. it's working fine on I2C2 at 400kbps.

bob239955 · ‎2011-05-17

Posted on May 17, 2011 at 12:26

FYI - Your kind attachment seems to be empty/corrupt.

[ This message was edited by: bobz on 19-03-2008 15:02 ]

lanchon · ‎2011-05-17

Posted on May 17, 2011 at 12:26

BTW, there's a ''problem'' with the I2C hardware. I reproduce a comment form the files here in case someone's dealing with the same issue:

// Some byte counts cannot be received safely by a polling process that can be preempted

// due to shortcomings in the peripheral hardware design, but a single byte can.

(at least that's my current understanding of the situation.)

lanchon · ‎2011-05-17

Posted on May 17, 2011 at 12:26

alex, I just downloaded i2c.zip from my post and tested its contents and everything seems to be alright. please try to download it again, maybe clearing your browser cache first.

alexanderlohr9 · ‎2011-05-17

Posted on May 17, 2011 at 12:26

In which way could I establish a connection between 2 I2C channels from the STR9 Board.