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Update co-processor FW via USART

Question asked by aizenshtark.boaz on Jan 11, 2015
Latest reply on Jan 11, 2015 by AvaTar
This is probably a too-broad question, but here goes:

I have a system where a master MCU (STM32F103) communicates with another MCU (TI CC2540) via UART. The master can be connected to a PC via USB.

The task at hand is to upgrade the firmware running on the CC2540 chip, via the UART interface.

What is the best way to tackle this?

Preliminary ideas:
  • Implement the full Serial-Bootloader protocol defined by TI on the master.
  • Implement a USB-UART bridge in the master, and relay to the TI chip