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toolchain setup: link to CH552 build instructions (#78)

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* Remove 'Optional' section from README, and update titles of
  sub-sections.
* Add link to sub-directory with CH552 setup instructions
* Fix line lengths in programmer board section
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doc/toolchain_setup.md
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@ -99,53 +99,47 @@ If your available `objcopy` and `size` commands is anything other than
the default `llvm-objcopy` and `llvm-size` define `OBJCOPY` and `SIZE` the default `llvm-objcopy` and `llvm-size` define `OBJCOPY` and `SIZE`
to whatever they're called on your system before calling `make`. to whatever they're called on your system before calling `make`.
## Optional ## Circuit board designs: KiCad 6.0
These tools are used for specific sub-components of the project, and
are not required for general development
### Kicad 6.0: Circuit board designs
The circuit board designs were all created in [KiCad The circuit board designs were all created in [KiCad
6.0](https://www.kicad.org/). 6.0](https://www.kicad.org/).
### mta1-usb-v1-programmer: RPi 2040 toolchain ## MTA1-USB-V1 and TP-1 programming board firmware
These tools are needed to build the programmer firmware for the The programmer boards are running a custom firmware developed by
mta1-usb-v1-programmer Blinkinlabs. The source code for this firnware is available on
Github: https://github.com/Blinkinlabs/ice40_flasher
There is also a pre built firmware binary available for the
#### FW update of programmer board programmer board:
The programmer board is running a custom firmware developed by Blinkinlabs. The source code
for this firnware is available on Github:
https://github.com/Blinkinlabs/ice40_flasher
There is also a pre built firmware binary available for the programmer board:
https://github.com/Blinkinlabs/ice40_flasher/tree/main/bin https://github.com/Blinkinlabs/ice40_flasher/tree/main/bin
To update the firmware on the programmer board, either build the file "main.uf2", or download To update the firmware on the programmer board, either build the file
the pre built file to your host computer. Then do the following: "main.uf2", or download the pre built file to your host computer.
Then do the following:
1. Disconnect the programming board from the host computer 1. Disconnect the programming board from the host computer
2. Press and hold the "BOOTSEL" button on the RPi2040 sub board on the programming board 2. Press and hold the "BOOTSEL" button on the RPi2040 sub board on
the programming board
3. Reconnect the programming board to the host computer 3. Reconnect the programming board to the host computer
4. Release the "BOOTSEL" button after connecting the programming board to the host. The board should now appear to the host as a USB connected storage device 4. Release the "BOOTSEL" button after connecting the programming
5. Open the storage device and drop the firmware file ("main.uf2") into the storage device board to the host. The board should now appear to the host as a
USB connected storage device
5. Open the storage device and drop the firmware file ("main.uf2")
into the storage device
The programmer will update its firmware with the file and restart itself. After reboot the storage device will automatically be disconnected. The programmer will update its firmware with the file and restart
itself. After reboot the storage device will automatically be
disconnected.
### mta1-usb-v1: ch552 USB to Serial firmware ## CH552 USB to Serial firmware
The USB to Serial firmware runs on the CH552 microcontroller, and The USB to Serial firmware runs on the CH552 microcontroller, and
provides a USB CDC profile which should work with the default drivers provides a USB CDC profile which should work with the default drivers
on all major operating systems. on all major operating systems. MTA1-USB-V1 and TK-1 devices come
with the CH552 microcontroller pre-programmed.
TODO Toolchain setup and build instructions for this firmware are detailed
in the
References: [ch552_fw directory](../hw/boards/mta1-usb-v1/ch552_fw/README.md)
* source code: https://github.com/tillitis/tillitis-key1/tree/main/hw/boards/mta1-usb-v1/ch552_fw
* Compiler: [SDCC](http://sdcc.sourceforge.net/)
* Library: https://github.com/Blinkinlabs/ch554_sdcc
* Flashing tool: https://github.com/ole00/chprog