Better SPI Bus Design in 3 Steps

Most Arduino SPI tutorials show this simple but poor SPI bus design: A much better SPI bus design can prevent conflicts.  3 simple improvements are needed: Use pullup resistors on all chip select signals. Verify tri-state behavior on MISO: use a tri-state buffer chip if necessary. Protect bus access with SPI.beginTransaction(settings) and SPI.endTransaction(). Click "Read more" for details on these 3 steps. ...

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Better SPI Bus Design in 3 Steps

Most Arduino SPI tutorials show this simple but poor SPI bus design:   A much better SPI bus design can prevent conflicts.  3 simple improvements are needed: Use pullup resistors on all chip select signals. Verify tri-state behavior on MISO: use a tri-state buffer chip if necessary. Protect bus access with SPI.beginTransaction(settings) and SPI.endTransaction(). Click "Read more" for details on these 3 ...

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