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SPI always reads zero???

Question asked by Jonathan Scott on Jun 20, 2014
Latest reply on Nov 12, 2014 by Mark Grillo

Well, this is somewhat embarrassing, but I'm finally frustrated enough to ask for help.  I have a simple routine to read 3 bytes from the SPI.  It worked just fine through months of development, and then something changed, and now it always returns zeros despite the correct data clearly present on a scope (screenshots attached).  This is an MK10DX128VMP5, using the IAR tools, with the SPI routines and drivers generated by PE.  What I should get is statbyte[0] = 0x40, statbyte[1] = 0x00, and statbyte[2] = 0x0B, but instead they are all 0x00.

 

MYSPI_ClearRxBuf();

STROBE_MISO_PutVal(1);                               //strobe is done with GPIO pins

STROBE_MISO_PutVal(0);      

 

for(i=0; i<3; i++){ 

  MYSPI_SendChar(0x00);                                 //clock in a char

spibyte = MYSPI_RecvChar(&statbyte[i]);   //get it

}

 

STROBE_MISO_PutVal(0);

 

Does anybody know what's going on?  I also attached a screenshot showing the spi configuration registers.

 

Thank you!!!

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