CF Bolt schematic @Tobias

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CF Bolt schematic @Tobias

Post by leonana69 »

Hi, I'm curious about the schematic design of cf bolt. It seems the STM_SWIO and STM_SWCLK are not connected with the NRF, then how the NRF flash the firmware for STM32?
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Re: CF Bolt schematic @Tobias

Post by arnaud »

When creating Crazyflie 2.0 we added as much functionality in the hardware as possible and this SWD connection from the nRF and the STM was intended to be able to debug the STM over the air. We never worked on that and so never used this functionality. When creating the bolt, it was inconvenient to keep the connection so we removed it.

When flashing the Crazyflie (or bolt) with the radio bootloader, there is a botloader firmware running both in the nRF and the STM and both communicates using the UART.
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