My guess is that you're encountering a NACK from the INA219 . The easiest way to do this is by using an incorrect address. (SendMultiByteStart absorbs the initial TXIFG.) What is the value of INA219 _ADDRESS? It should be something in the range 0x40-0x4F, and needs to match the way the A0/A1 pins are set. [Ref INA219 Data Sheet (SBOS448G) Table 1.]
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