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FINALLY – the MSP430x2xx new serial module sucks! Finally got I2C working.

October 20th, 2008

It took a solid 25+ hours of work, but I finally got the MSP430F2618 to talk to the AD5933 via I2C.  The TIs documentation sucks, their module sucks, and I’m angry.  But it works now.  A hit to those that might be stuck: The USCIABxTX_ISR() interrupt vector should be called the Master interrupt vector, and their USCIABxRX_ISR() interrupt vector should be the Slave interrupt vector.  In master mode, both the TX and RX interrupt enables results in the TX_ISR() vector being called.

Other issues include that the SDA line gets stuck latched low and will persist through a power cycle and a reprogramming.  You expicitley have to pull the line high in software to reset it.

A bunch of other issues later, I got it working..  I ended up picking up a new logic analyzer because of it’s improved interface than my USBee unit.  $150, and it ROCKS.  Joe makes them locally, and I recommend you pick one up for your toolbox.

data read from ad5933

data read from ad5933

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