Added MCU support for ArteryTek AT32F415 (#23445)

docs/compatible_microcontrollers.md

@@ -57,6 +57,10 @@ You can also use any ARM chip with USB that [ChibiOS](https://www.chibios.org) s
  * [WB32F3G71xx](http://www.westberrytech.com)
  * [WB32FQ95xx](http://www.westberrytech.com)
 
+### Artery (AT32)
+
+ * [AT32F415](https://www.arterychip.com/en/product/AT32F415.jsp)
+
 ### NXP (Kinetis)
 
  * [MKL26Z64](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/kl-series-cortex-m0-plus/kinetis-kl2x-72-96-mhz-usb-ultra-low-power-microcontrollers-mcus-based-on-arm-cortex-m0-plus-core:KL2x)

docs/driver_installation_zadig.md

@@ -98,6 +98,7 @@ The device name here is the name that appears in Zadig, and may not be what the
 |`bootloadhid` |HIDBoot                       |`16C0:05DF`   |HidUsb |
 |`usbasploader`|USBasp                        |`16C0:05DC`   |libusbK|
 |`apm32-dfu`   |APM32 DFU ISP Mode            |`314B:0106`   |WinUSB |
+|`at32-dfu`    |AT32 Bootloader DFU           |`2E3C:DF11`   |WinUSB |
 |`stm32-dfu`   |STM32 BOOTLOADER              |`0483:DF11`   |WinUSB |
 |`gd32v-dfu`   |GD32V BOOTLOADER              |`28E9:0189`   |WinUSB |
 |`kiibohd`     |Kiibohd DFU Bootloader        |`1C11:B007`   |WinUSB |

docs/flashing.md

@@ -345,6 +345,39 @@ Flashing sequence:
 3. Flash a .bin file
 4. Reset the device into application mode (may be done automatically)
 
+## AT32 DFU
+
+All AT32 MCUs come preloaded with a factory bootloader that cannot be modified nor deleted.
+
+To ensure compatibility with the AT32-DFU bootloader, make sure this block is present in your `rules.mk`:
+
+```make
+# Bootloader selection
+BOOTLOADER = at32-dfu
+```
+
+Compatible flashers:
+
+* [dfu-util](https://dfu-util.sourceforge.net/) / `:dfu-util` target in QMK (recommended command line)
+  ```
+  dfu-util -a 0 -d 2E3C:DF11 -s 0x8000000:leave -D <filename>
+  ```
+
+Flashing sequence:
+
+1. Enter the bootloader using any of the following methods:
+    * Tap the `QK_BOOT` keycode
+    * If a reset circuit is present, tap the `RESET` button on the PCB; some boards may also have a toggle switch that must be flipped
+    * Otherwise, you need to bridge `BOOT0` to VCC (via `BOOT0` button or jumper), short `RESET` to GND (via `RESET` button or jumper), and then let go of the `BOOT0` bridge
+2. Wait for the OS to detect the device
+3. Flash a .bin file
+4. Reset the device into application mode (may be done automatically)
+
+### `make` Targets
+
+* `:dfu-util`: Waits until an AT32 bootloader device is available, and then flashes the firmware.
+* `:dfu-util-split-left` and `:dfu-util-split-right`: Flashes the firmware as with `:dfu-util`, but also sets the handedness setting in EEPROM.
+
 ## tinyuf2
 
 Keyboards may opt into supporting the tinyuf2 bootloader. This is currently only supported on F303/F401/F411.