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MSP430G2553: I2C SoftwareLibrary not communicating properly

Patrick Houlihan
Prodigy 50 points
Part Number: MSP430G2553

Hello,

AS mentioned i have an MSP430G2553 and my goal is to have it communicate on two separate I2C networks. For testing I am using a HX711.

So far i can get the hardware I2C to communicate properly with the HX711 on pins P1.6 and P1.7, but when i switch to software I2C and assign it to pins P2.6 and P2.7 I just get 255 back. 

For the hardware network I am using Wire.h and for the software network I am using I2C_SoftwareLibrary.h.

Here are screen shots of the scope reading, I suspect the timing of the initial request is the issue bit do not know how to adjust.

Good communication above.

Bad comms.

Any suggestions would be appreciated!

  • 0
    Guru 243180 points
    The "good" screenshot does not show the complete transaction.
    The "bad" screenshot shows that the slave does not ACK. In that case, the master must not continue the transaction; apparently, your code lacks error handling.

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