Does the DA14531 module support booting from 1-wire UART on P0_5? P0_5 is the only pin exposed that is supported by the built-in DA14531 bootloader.
Our goal is to upload firmware from a master MCU with its own flash. Ideally we would have preferred the module's SPI boot pins exposed.
Device:
Hi GuitarNick,
The bootloader of the DA14531 supports 1-wire UART interface on P0_5 which is step 2 of the booting sequence. However, you should connect the P0_5 (Tx/Rx) with the external MCU RX and TX via a 1k resistor
Please find more info in the “DA14531 Boot Options” document. Link is provided below:
//www.wsdof.com/sites/default/files/an-b-072-da14531_booting_options_v1.2.pdf
Thanks, PM_Dialog
谢谢你！是1k resistor requirement specific only to the MCU on the Pro Evaluation board? If our external MCU supports TX in open-drain mode, would it be possible to omit/short the resistor?
Hi GuitarNick,
The 1K resistor is not only for our Development Board. Generally, we recommend the usage of 1K resistor in case of booting from 1-wire UART. I can ask the right people internally if you need to reduce the value of the resistor.
Thanks, PM_Dialog
Thank you, we will include the 1k resistor in our PCB layout.