LM4F230H5QR SPI/SSI Communication with ADXL362 SPI Format

Varun Annadi

I am wondering how to configure my SSI peripheral in my Tiva part to be able to communicate correctly with the ADXL362 accelerometer. The timing diagram the ADXL362 requires is

I have attempted doing this with the MICROWIRE frame format, but this requires only 8 bits of control data, while the ADXL362 requires 16 bits. Any suggestions would be greatly appreciated.

over 12 years ago

0 Sam Friedman over 12 years ago

TI__Intellectual 855 points

Hi Varun,

The ADXL362 datasheet should tell you which SPI mode to use. For your application, you'll want to manually control the CS line in software so that you have control over the number of bytes in each transaction.

Regards,

Sam

0 Varun Annadi over 12 years ago in reply to Sam Friedman

Prodigy 60 points

Hi Sam,

The datasheet says to use the freescale spi with SPOL=SPHA=0. But when I do this, the chip select goes low between bytes, which the ADXL362 doesn't want. Do you know of a mode that would allow me to keep the CS low without having to control it manually?

Thanks,

Varun

0 Sam Friedman over 12 years ago in reply to Varun Annadi

TI__Intellectual 855 points

No, you'll have to control it manually to keep it low for as long as you want.

Regards,

Sam

0 Varun Annadi over 12 years ago in reply to Sam Friedman

Prodigy 60 points

Ok, Thanks Sam.

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LM4F230H5QR SPI/SSI Communication with ADXL362 SPI Format