mirror of
https://github.com/ferrous-systems/embedded-trainings-2020.git
synced 2024-06-03 05:59:23 +00:00
18 lines
912 B
Markdown
18 lines
912 B
Markdown
# Flashing the Program
|
|
|
|
✅ Use the following command to flash the program to the device.
|
|
|
|
``` console
|
|
$ cargo flash --chip nRF52840_xxAA --bin hello
|
|
```
|
|
|
|
> NOTE: If you run into an error along the lines of "Debug power request failed" retry the operation and the error should disappear.
|
|
|
|
This subcommand will build the program first so you'll always flash the latest version.
|
|
|
|
The `cargo-flash` subcommand flashes and runs the program but won't display logs. It is a deployment tool.
|
|
|
|
**🔎 How does flashing work?**
|
|
|
|
The flashing process consists of the PC communicating with a second microcontroller on the nRF52840 DK over USB (J2 port). This second microcontroller, named J-Link, is connected to the nRF52840 through a electrical interface known as SWD. The SWD protocol specifies procedures for reading memory, writing to memory, halting the target processor, reading the target processor registers, etc.
|