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20 lines
971 B
Markdown
20 lines
971 B
Markdown
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# Flashing the Program
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The following command will flash the ELF file to the device.
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``` console
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$ cargo flash --chip nRF52840_xxAA --elf target/thumbv7em-none-eabi/debug/hello
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```
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> NOTE if you run into an error along the lines of "Debug power request failed" retry the operation and the error should disappear
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Alternatively you can run this command, which builds the application before flashing it.
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``` console
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$ cargo flash --chip nRF52840_xxAA --bin hello
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```
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The `cargo-flash` subcommand flashes and runs the program but won't display logs. It is a deployment tool.
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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 JTAG. The JTAG protocol specifies procedures for reading memory, writing to memory, halting the target processor, reading the target processor registers, etc.
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