AFE4490: SPI Initialize and communication problem

Kanimozhi Raju

Part Number: AFE4490

I interface AFE4490 with freescale customised controller.SPI communication is not working .when i try to read from led control register by writing 1 value am getting zero as a result.I checked with mosi lines in logic analyzer the data what i have wriiten is displayed on mosi line and when i read back am getting zero on miso line.I will attach the screenshots now.I used mhz,8mhz for clockrate.I need to know the clock rate to use .I am using mode 0 for spi.read sequence is disable spi_readbit and write one value to register and enable spi_read bit and reading back the data.I ahve already posted question but didnt get the response .It would be great if you resolve the issue at earliest.Thank s in advance.

over 8 years ago

0 Praveen Aroul over 8 years ago

TI__Mastermind 49946 points

Hi Kanimozhi,

In all your waveforms, the chip select (SPISTE) signal is high. SPISTE is an active low signal.

0 Kanimozhi Raju over 8 years ago in reply to Praveen Aroul

Prodigy 115 points

Hi Praveen,

I am attaching spi waveforms with cs low.

Thank you.

0 Prabin Yadav over 8 years ago in reply to Kanimozhi Raju

TI__Genius 12575 points

Hi Kanimozhi,

I would suggest you get the register write working first.
To do this you can follow the given steps below.
1) Apply the RESET signal.
2) Measure the TX_REF ( Pin 9) .
3) write 0x1 to register 0x23.
4) Measure the TX_REF again. This time it should be different as observed instep 2.

Regards,
Prabin

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AFE4490: SPI Initialize and communication problem