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In this example idata is not initialized before calling SPICmd().  If your SPI device needs specific data
written to it during the read phase idata would need to be initialized before the call.
Compatibility
The use of a zero value to indicate that no data buffer is being supplied is not supported in BasicX
compatibility mode.  Also, in BasicX compatibility mode, both writeCnt and readCnt are Byte values
and, thus, limited to a maximum of 255.
See Also
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