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In what way is SPI used on Robostix?

April 26, 2017robostix SPI Used

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In what way is SPI used on Robostix?

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SPI is used in a way that allows a software download over SPI (NSSP on the gumstix side), to take advantage of the Power-on-reset autodownload over SPI. On this board, there is an LDO between the V_BATT (Power Jack) and the supply to the ATmega128. So: dropping L_DD14 will drop the AT power enable, and dropping L_DD13 will drop nPROG_EN. If the programming_enable line is low when the chip powers back up it will download boot code over the SPI.