Hi friends! I've built a small board containing an ATMEGA328p and a CC1101 radio chip, both communicating via SPI. Everything works perfect except the Arduino bootloader. On four boards, the bootloader works well only in one of them, the one without the CC1101 IC mounted on it. On the rest of board…

Bootloader problem when SPI slave connected

MarkT February 17, 2011, 5:51pm 4

Suggest adding pull-up/pull-down resistors on the SPI bus to hold it safely idle, also that RF chip is 3.3V, what voltage are you running the 328 at when uploading?

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Bootloader problem when SPI slave connected

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