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Original question:

TMS320F28035: I2c Slave example

TMS320F28035: I2C slave sample code for tms320f28035

sai charan piduru
Prodigy 110 points
Part Number: TMS320F28035


Hi, can you provide a code snippet to explain i2c slave operation in 28035 device?

  • 0
    TI__Guru 55700 points

    Sai,

    We don't have I2C slave example for F28035 device. But, we have a slave example in F2838x device (which uses driverlib). You can apply the logic and code it in bit-field. This reply was in the original post and it still applies.

    The only slave example we have currently is for the F2838x (i2c_ex3_external_loopback from C2000Ware 2.00.00.02), but it's written with a driverlib API, so it may be a bit of a challenge to translate it back to the bit-field struct header files that F28035 uses. Might help to look at it though.

    You can also try searching the forum to see if someone else has shared some slave code.

    Whitney

    Regards,

    Manoj

  • 0 in reply to Manoj Santha Mohan
    Prodigy 110 points

    The example code uses driver lib and it is written for 2838x series. Can you please post a very simple slave code example for 28035 which explains i2c interrupts required, slave mode - tx or rx and detect whether last byte was address or data. 

  • 0 in reply to sai charan piduru
    TI__Guru 55700 points

    I don't have readymade code to share with you. I do know that example I pointed to you belongs to 2838x series. But, I2C module available in F2838x and F2803x are pretty much the same. So, the register configurations are pretty much the same. So, you should be able to adapt the driverlib code to headerfile approach.

    Regards,

    Manoj

  • 0 in reply to Manoj Santha Mohan
    Prodigy 110 points 
    void init_i2c_slave(void)
{
	I2caRegs.I2COAR = 0x50;
	I2caRegs.I2CIER.bit.XRDY = 1;
	I2caRegs.I2CIER.bit.RRDY = 1;
	I2caRegs.I2CIER.bit.AAS = 1;
	I2caRegs.I2CMDR.bit.MST = 0;
	I2caRegs.I2CMDR.bit.IRS = 1;
}

__interrupt void isr_i2c(void)
{
	Uint32 int_code = 0;
	int_code = I2caRegs.I2CISRC.bit.INTCODE;
	if(int_code == 0b100)    //receive ready interrupt
	{
	   i2c_rx_data[i2c_rx_index++] = I2caRegs.I2CDRR;
	   I2caRegs.I2CSTR.bit.RRDY = 1;
	}
	if(int_code == 0b101)    //transmit ready interrupt
	{
	   I2caRegs.I2CDXR = i2c_tx_data[i2c_tx_index++];
	}
	if(int_code == 0b111)    //addressed as slave
	{
	   i2c_rx_index = 0;
	   i2c_tx_index = 0;
	}
	// reset interrupt flag 
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP8; 
}