Hello,
I have a problem with communication with ADIS16467.
I have experiance with ADIS16334 and ADIS16362.
This time, using the same embedded system like for two previously used ADIS, I am not able to read PROD_ID.
My SPI configuration is similar to configuration I use for 16334 and 16362 except Tcs and Tstall.
No matter what register address I read, only 8 upper bits are send back. For instance, if I read 0x7200 I receive 0x40 (PROD_ID for 16467 is 0x4053 == 0100 0000 0101 0011)
or if I read Z_ACCL_OUT (0x1A00) I receive 0x0003 while I should receive more less 000 0011 0010 0000 (ADIS is level so the output should be ~800LSB * 1.25 == 1000mg).
I have noticed that If I do one additional 16-bit cycles on SPI the 8 lower bits are received (accoriding to the specification: "reading a single register requires two 16-bit cycles on the SPI").
I checked all ADIS signals and they looks OK on the scope. Bellow are some screenshots.
I checked power supply current and it is as specification says.
One more thing, I also noticed that if I add some delay in the code (like 800 of asm"nop") just after new 16bits value is put into SPI TX register (this line starts sendind data to ADIS), I am receiving correct data. However such delay should not be in the C code. The same effect I obtained replacing "nops" with putting a breakpoint in the same line where nops were (so I also put some delay because to do second 16-bit cycles on SPI I have to release the breakpoint).
CS
SCLK
DIN - 0x1A00 (0001 1010 0000 0000)
DOUT = 0x0003
and some another screenshots
DR
CS
and
some screenshots with two signals
DR + CS (CS starts on the second edge of DR)
CS + SCLK (tcs= ~800ns)
I am wondering what else I missed.
