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LSM303 STEVAL-MKI133V1 SPI probs

jyoung2
Associate
Posted on June 25, 2014 at 19:39

Bought this eval board.

Hooked it up to a TI Launchpad...

I run the SPI in 4 wire...

I can see the SPI buss sending data (o-scope)...timing good, clocks good, setup good...

When I READ I see the data coming back BEFORE the 8th clock cycle...????

Almost like something is ''jacked'' inside the device...

for a test, I step back and forth from writing to a CNTRL reg and then reading it back...

(i.e. send 0x00 to CNTRL0 (reg 0x1F)..then I read it back...I see 0 read back...then I increment the data (write 0x01 to CNTRL0)..read it back...I see the ''1'' come back on the 8th clock...not the sixteenth (on a read: R/W=1, MS=0, A5-A0...dummy data for 8 bits...the data from SDO should come back on those last 8 clk's....correct?)

so what am I missing?...

I also unhooked the SDO from the TIVA (in case of some prob there)...same deal....

bad part?...bum eval kit?.....

bueller...bueller....anyone?.....

send me email  jyoung AT lauferwind DOT com

#lsm303d
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