Changing I2C Flash Buffer Size

[jspiller]

Hello,

I am working on a driver in which it needs to transfer larger sets of data over a I2C connection. However, I am getting this:

"Cannot copy flash buffer of size: 32768. Adjust the zephyr,flash-buf-max-size property in the "I2C_0" node."

and I'm unsure how to set this on sdk 1.9.1. Would it be set in my .overlay file or could you set it in the prj.conf? Any help would be appreciated.

Thanks,

Jacob

[Simon]

The zephyr,flash-buf-max-size property needs to be set in a devicetree specific file, for example an overlay file. It should be used inside an I2C node (for example I2C_0) where the compatible is set to "nordic,nrf-twim" (see nordic,nrf-twim.yaml).

Check out the text at the bottom of nordic,nrf-twim.yaml for more information about the property zephyr,flash-buf-max-size: https://github.com/nrfconnect/sdk-zephyr/blob/240c7b9a691f6bcee824d1b26a40a368a916bb05/dts/bindings/i2c/nordic%2Cnrf-twim.yaml#L44-L63.

I could not find any example where zephyr,flash-buf-max-size is used, but here is an example of how to set i2c1 with compatible="nordic,nrf-twim" in an overlay file: https://github.com/nrfconnect/sdk-nrf/blob/df94a1ac89dc3f7b9ed43faaeaab1033aa4f897f/samples/bluetooth/mesh/sensor_server/boards/thingy53_nrf5340_cpuapp_ns.overlay#L82-L86

Best regards,

Simon