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78 lines
2.6 KiB
Markdown
78 lines
2.6 KiB
Markdown
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# Proton C
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The Proton C is an Arm STM32F303xC based drop-in replacement for the Pro Micro.
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<img src="https://i.imgur.com/GdsN1Rdh.jpg" alt="Proton C" />
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#### Features
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* Through-hole mounted USB-C Port
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* 32-bit 72MHz Cortex-M4 processor (STM32F303CCT6)
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* I2C, SPI, PWM, DMA, DAC, USART, I2S
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* 23x 3.3V I/O Ports
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* 1x 5V output for WS2812 LED chains
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* 256kB flash
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* 40kB RAM
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* AST1109MLTRQ speaker footprint
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* Reset button
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## Warnings
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Some of the PCBs compatible with Pro Micro have VCC (3.3V) and RAW (5V) pins connected (shorted) on the pcb. Using the Proton C will short 5V power from USB and regulated 3.3V which is connected directly to the MCU. Shorting those pins may damage the MCU on the Proton C.
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So far, it appears that this is only an issue on the Gherkin PCBs, but other PCBs may be affected in this way.
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In this case, you may want to not hook up the RAW pin at all.
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## Manual Conversion
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To use the Proton C natively, without having to specify `CONVERT_TO=proton_c`, you need to change the `MCU` line in `rules.mk`:
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```
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MCU = STM32F303
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BOARD = QMK_PROTON_C
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```
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Remove these variables if they exist:
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* `BOOTLOADER`
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* `EXTRA_FLAGS`
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Finally convert all pin assignments in `config.h` to the stm32 equivalents.
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| Pro Micro Left | Proton C Left | | Proton C Right | Pro Micro Right |
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|-----------|----------|-|----------|-----------|
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| `D3` | `A9` | | 5v | RAW (5v) |
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| `D2` | `A10` | | GND | GND |
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| GND | GND | | FLASH | RESET |
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| GND | GND | | 3.3v | VCC <sup>1</sup> |
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| `D1` | `B7` | | `A2` | `F4` |
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| `D0` | `B6` | | `A1` | `F5` |
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| `D4` | `B5` | | `A0` | `F6` |
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| `C6` | `B4` | | `B8` | `F7` |
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| `D7` | `B3` | | `B13` | `B1` |
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| `E6` | `B2` | | `B14` | `B3` |
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| `B4` | `B1` | | `B15` | `B2` |
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| `B5` | `B0` | | `B9` | `B6` |
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| `B0` (RX LED) | `C13` <sup>2</sup> | | `C13` <sup>2</sup> | `D5` (TX LED) |
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You can also make use of several new pins on the extended portion of the Proton C:
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| Left | | Right |
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|------|-|-------|
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| `A4`<sup>3</sup> | | `B10` |
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| `A5`<sup>4</sup> | | `B11` |
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| `A6` | | `B12` |
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| `A7` | | `A14`<sup>5</sup> (SWCLK) |
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| `A8` | | `A13`<sup>5</sup> (SWDIO) |
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| `A15` | | RESET<sup>6</sup> |
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Notes:
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1. On a Pro Micro VCC can be 3.3v or 5v.
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2. A Proton C only has one onboard LED, not two like a Pro Micro. The Pro Micro has an RX LED on `D5` and a TX LED on `B0`.
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3. `A4` is shared with the speaker.
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4. `A5` is shared with the speaker.
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5. `A13` and `A14` are used for hardware debugging (SWD). You can also use them for GPIO, but should use them last.
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6. Short RESET to 3.3v (pull high) to reboot the MCU. This does not enter bootloader mode like a Pro Micro, it only resets the MCU.
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