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Transmitting int16 value through i2c
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snock



Joined: 10 Oct 2011
Posts: 24

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PostPosted: Fri Aug 02, 2013 9:14 am     Reply with quote
Ok, great. I appreciate the help.

Here is the routine I am testing now:

Code:

// * I2C INTERRUPT HANDLER *****************************************************
#int_ssp
void i2c_handler(void) {
    int8 state, incoming;
    state=i2c_isr_state();
    if(state<0x80) { // Master is sending data
       incoming = i2c_read(1);
       if(state==1) mem_addr=incoming; // Store the address
       if(state==2) card_data[mem_addr]=incoming; // Read and store the data
    }
    if(state>=0x80) { // Master is requesting data
       i2c_write(card_data[mem_addr]);  // Write the memory over i2c
    }
}
// *****************************************************************************       
jeremiah



Joined: 20 Jul 2010
Posts: 1371

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PostPosted: Fri Aug 02, 2013 9:41 am     Reply with quote
One thing to note on #use i2c(). At some point in the early 4.100's, they swapped to 7bit addressing for the address parameter. They did switch back to 8bit addressing later on, but I dont' remember which versions were affected. You might try changing the address in your #use i2c() to 7 bit format for the 4.124 version and see if that works. If not, make sure to swap back to 8bit so you don't forget.
muhibraza1



Joined: 26 Jul 2013
Posts: 23

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PostPosted: Mon Aug 05, 2013 6:48 am     Reply with quote
I am thankful to all of you for your valuable comments. the errata thing was the actual problem. It wasted so many days.
After ticking the Dont Do BSR15, I can see the system is not hanging at least. Now I am making tweaks and trying to understand the basic i2c communication.
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