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Update README.md
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foldedtoad committed Nov 7, 2021
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Expand Up @@ -116,7 +116,7 @@ Many of the examples will require two or more PCA100xx + DWS3000 setups, such as
If you wish to use a Segger JLink adapter for development, then you will need to update the on-board debugger firmare for the Nucleo board: conversion details [here](https://www.segger.com/products/debug-probes/j-link/models/other-j-links/st-link-on-board).

**NOTE:** The Nucleo board may need to be modified per Decawave's recommendations: see DWS3000 Quick Start Guide for details.
In particular there is a conflict between the ethernet controller and the arduino use of pin D11, which is used by SPI1 as the MOSI line. The Nucleo-F429ZI board's solder-bridges, SB121 and SB122, must be changed. Remove the solder from SP121 (open) and solder-bridge SB122 (close). Without this change, the SPI MOSI line will always be pulled low and SPI transactions to the DWM3000 will fail.
In particular there is a conflict between the ethernet controller and the arduino use of pin D11, which is used by SPI1 as the MOSI line. The Nucleo-F429ZI board's solder-bridges, SB121 and SB122, must be changed. Remove the solder from SP122 (open) and solder-bridge SB121 (close). Without this change, the SPI MOSI line will always be pulled low and SPI transactions to the DWM3000 will fail.
See photo below for modified board's solder-bridge configuation.
![dws3000](https://github.com/foldedtoad/dwm3000/blob/master/docs/Nucleo_F429ZI_solder_bridge_config.JPG)

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