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Original question:

Piccolo device with multiple I2C slave addresses?

TMS320F280025: support multiple slave address or not?

Emma Wang
Expert 5290 points
Part Number: TMS320F280025
Other Parts Discussed in Thread: C2000WARE

Hi expert, 

I want to know whether F280025 support multiple slave address or not?

and which part can tell this?

I look through TRM of MSP432P401M, and found there is 4 register so support 4 slave address.

"The registers UCBxI2COA0, UCBxI2COA1, UCBxI2COA2, and UCBxI2COA3 contain four slave addresses. Up to four address registers are compared against a received 7- or 10-bit address. Each slave address must be activated by setting the UCOAEN bit in the corresponding UCBxI2COAx register. Register UCBxI2COA3 has the highest priority if the address received on the bus matches more than one of the slave address registers. The priority decreases with the index number of the address register, so that UCBxI2COA0 in combination with the address mask has the lowest priority."

https://www.ti.com/lit/ug/slau356i/slau356i.pdf

I did not find similar information on F280025. so C2000 still can not support multiple slave address.am I right?

If so , can we support that by SW method?

BR

Emma

  • 0
    TI__Genius 11975 points

    F280025 has I2C and also supports multiple slave addressing. Pls check F28002x Tech Ref Manual (TRM) for details.

    Shamim

  • 0 in reply to Shamim Choudhury
    TI__Expert 5290 points

    Hi Shamim，

    could you kindly point out the register or the part describe this?

    BR

    Emma

  • +1 in reply to Emma Wang
    TI__Guru 55700 points

    Emma,

    Your observation is right. C2000 I2C doesn't support multiple slave addressing. I2COAR register is the only register to store its address. So, unless C2000 I2C receives address stored in I2COAR register it wouldn't send ACK signal back to master.

    We however have PMBus module which is based on I2C protocol. PMBus does support supporting multiple slave addressing using PMBSC.SLAVE_MASK.

    We have example of PMBus used as I2C peripheral on F28004x device. This example can be adapted to F280025 easily.

    <C2000Ware>\libraries\communications\PMBus\c28\examples\28004x_pmbus_i2c_eeprom

    Regards,

    Manoj