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Instructions on how to flash via STM32 bootloader (#4316)
* Add instructions on flashing ARM keyboards with default STM32 bootloader * fixed typo; added note suggestion to step 4
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@ -71,8 +71,8 @@ Flashing sequence:
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1. Press the `RESET` keycode, or short RST to GND quickly (you only have 7 seconds to flash once it enters)
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2. Wait for the OS to detect the device
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4. Flash a .hex file
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5. Wait for the device to reset automatically
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3. Flash a .hex file
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4. Wait for the device to reset automatically
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or
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@ -106,5 +106,28 @@ Flashing sequence:
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1. Press the `RESET` keycode, or short RST to GND quickly (you only have 7 seconds to flash once it enters)
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2. Wait for the OS to detect the device
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4. Flash a .hex file
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5. Reset the device into application mode (may be done automatically)
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3. Flash a .hex file
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4. Reset the device into application mode (may be done automatically)
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## STM32
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All STM32 chips come preloaded with a factory bootloader that cannot be modified nor deleted. Some STM32 chips have bootloaders that do not come with USB programming (e.g. STM32F103) but the process is still the same.
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At the moment, no `BOOTLOADER` variable is needed on `rules.mk` for STM32.
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Compatible flashers:
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* [QMK Toolbox](https://github.com/qmk/qmk_toolbox/releases) (recommended GUI)
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* [dfu-util](https://github.com/Stefan-Schmidt/dfu-util) / `:dfu-util` (recommended command line)
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Flashing sequence:
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1. Enter the bootloader using any of the following methods:
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* Tap the `RESET` keycode (may not work on STM32F042 devices)
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* If a reset circuit is present, tap the RESET button
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* Otherwise, you need to bridge BOOT0 to VCC (via BOOT0 button or bridge), short RESET to GND (via RESET button or bridge), and then let go of the BOOT0 bridge
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2. Wait for the OS to detect the device
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3. Flash a .bin file
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* You will receive a warning about the DFU signature; Just ignore it
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4. Reset the device into application mode (may be done automatically)
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* If you are building from command line (e.g. `make planck/rev6:default:dfu-util`), make sure that `:leave` is passed to the `DFU_ARGS` variable inside your `rules.mk` (e.g. `DFU_ARGS = -d 0483:df11 -a 0 -s 0x08000000:leave`) so that your device resets after flashing
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