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sparkfun / SparkFun_ICM-20948_ArduinoLibrary

Arduino support for ICM_20948 w/ portable C backbone
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Found solution for: SparkFun ICU-29048 does not initialize. Serial monitor displays "Data Underflow" #128

Closed dfr2248 closed 9 months ago

dfr2248 commented 9 months ago

SparkFun ICU-20948

Found Solution for "Data Underflow"

Your workbench

Steps to reproduce

Running any sketch, the sketch compiles without errors, but when the Serial Monitor is activated it reads "Data Underflow" Normally all the data should be displayed, but it is not.

Actual behaviour

reads "Data Underflow" in the Serial Monitor

The ADR jumper on the back of the board is soldered which make the AD0_VAL 0. In the sketch "Example1_Basic, line 24 reads AD0_VAL 1. Change line 24 to AD0_VAL 0. Compile the sketch, open the Serial Monitor , and the data will be displayed. I believe this is the fix for all the Example Sketches.

PaulZC commented 9 months ago

Hi @dfr2248 ,

Yes, closing the ADR jumper changes the I2C address from 0x69 (AD1) to 0x68 (AD0). Closing the ADR jumper prevents you from using the SPI interface, so - on SparkFun boards - we ship them with the jumper open. The examples are correct for the SparkFun board as shipped.

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I am glad you found the solution.

Best wishes, Paul