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140 lines
7.3 KiB
Markdown
140 lines
7.3 KiB
Markdown
- [Step by step guide how to make SC64](#step-by-step-guide-how-to-make-sc64)
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- [**PCB manufacturing data**](#pcb-manufacturing-data)
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- [**PCB requirements**](#pcb-requirements)
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- [**Components**](#components)
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- [**Plastic shell**](#plastic-shell)
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- [**Putting it together**](#putting-it-together)
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- [**Initial programming**](#initial-programming)
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- [**Troubleshooting**](#troubleshooting)
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- [*`primer.py` threw `No SC64 USB device found` error*](#primerpy-threw-no-sc64-usb-device-found-error)
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- [*`primer.py` threw `SDRAM test error...` message*](#primerpy-threw-sdram-test-error-message)
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- [*`primer.py` threw other error message*](#primerpy-threw-other-error-message)
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---
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## Step by step guide how to make SC64
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All necessary manufacturing files are packaged in every `sc64-extra-{version}.zip` file in GitHub releases.
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Please download latest release before proceeding with the instructions.
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---
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### **PCB manufacturing data**
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1. Locate KiCad project inside `hw/pcb` folder
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2. Export gerber/drill files
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3. Export BOM spreadsheet
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4. Export PnP placement files
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5. Send appropriate files to the PCB manufacturer
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---
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### **PCB requirements**
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***Before ordering PCBs make sure you select correct options listed below:***
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- PCB thickness: 1.2 mm
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- Surface finish (plating): ENIG (Hard gold for edge connector is recommended but it's very expensive)
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- PCB contains edge connector: yes
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- Beveled edge connector: yes, 45° (other angles also should work OK)
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---
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### **Components**
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1. Locate interactive BOM file inside `hw/pcb` folder (alternatively, check out this [BOM discussion](https://github.com/Polprzewodnikowy/SummerCart64/discussions/27))
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2. Order all parts listed in the BOM file or use PCB assembly service together with your PCB order
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---
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### **Plastic shell**
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1. Locate `.stl` files inside `hw/shell` folder
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2. Use these files in the slicer and 3D printer of your choice or order ready made prints from 3D printing company
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3. For screws, M2x10 works great for the top two holes while M2x8 fits well in the bottom two
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---
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### **Putting it together**
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There are no special requirements for soldering components to board.
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All chips and connectors can be soldered with standard manual soldering iron, although hot air station is recommended.
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Interactive BOM has every component and its value highlighted on PCB drawings and it's strongly recommended to use during assembly process.
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You can skip this step if PCB assembly service was used in previous steps.
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---
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### **Initial programming**
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**Please read the following instructions carefully before proceeding with programming.**
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***Note:*** This guide assumes you are using Windows 10 or above.
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You will require the following hardware:
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- A PC running Windows 10 or above (any Linux distro should also work but programming FT232H EEPROM is arguably trickier without an official app).
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- A USB to UART (serial) adapter (with 3.3V signaling is required, e.g. TTL-232R-3V3).
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You will require the following applications and packages:
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- [FT_PROG](https://ftdichip.com/utilities/#ft_prog) - FTDI FT232H EEPROM programming software.
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- [Python 3](https://www.python.org/downloads/) with `pip3` - necessary for initial programming script: `primer.py` (Windows install: check option add python to PATH).
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- [`sc64-extra-{version}.zip`](https://github.com/Polprzewodnikowy/SummerCart64/releases) - programming scripts and firmware files, download the latest version.
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**Programming must be done in specific order for `primer.py` script to work correctly.**
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Preparations:
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1. Install FT_PROG.
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2. Install Python 3.
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3. Unpack `sc64-extra-{version}.zip` into a folder.
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4. Open terminal and navigate to the folder you've unpacked SC64 files.
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First, program the ***FT232H EEPROM***:
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1. Connect the SC64 board to your PC with a USB-C cable.
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2. Locate FT232H EEPROM template `ft232h_config.xml` from the `fw/ftdi/` directory.
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3. Launch `FT_PROG` software.
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4. Click on `Scan and parse` if no device has shown up.
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5. Right click on SC64 device and choose `Apply Template -> From File`.
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6. Select previously located `ft232h_config.xml`.
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7. Right click on SC64 device and choose `Program Device`.
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Your SC64 should be ready for next programming step.
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Second, program ***FPGA, microcontroller and bootloader***:
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1. Disconnect SC64 board from power (unplug USB-C cable).
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2. Connect serial UART/TTL adapter to `TX/RX/GND` pads marked on the PCB. Cross connection `TX -> RX`, `RX -> TX`!
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3. Connect serial adapter to the PC.
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4. Check in device manager which port number `COMx` is assigned to serial adapter.
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5. Connect SC64 board to the PC with USB-C cable (***IMPORTANT:*** connect it to the same computer as serial adapter).
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6. Locate `primer.py` script in the root folder.
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7. Make sure these files are located in the same folder as `primer.py` script: `requirements.txt`, `sc64-firmware-{version}.bin`.
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8. Run `pip3 install -r requirements.txt` in the terminal to install required python packages.
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9. Run `python3 primer.py COMx sc64-firmware-{version}.bin` (replace `COMx` with port located in step **4**). On Windows it's `python` instead of `python3`.
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10. Follow the instructions on the screen.
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11. Wait until programming process has finished (**DO NOT STOP PROGRAMMING PROCESS OR DISCONNECT SC64 BOARD FROM PC**, doing so might irrecoverably break programming through UART header and you would need to program FPGA and/or microcontroller with separate dedicated programming interfaces through *Tag-Connect* connector on the PCB).
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Congratulations! Your SC64 flashcart should be ready for use!
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---
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### **Troubleshooting**
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#### *`primer.py` threw `No SC64 USB device found` error*
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This issue can be attributed to incorrectly programmed FT232H EEPROM in the first programming step.
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Check again in `FT_PROG` application if device was configured properly.
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Make sure default FTDI drivers are installed for the SC64 in the device manager (only on Windows OS).
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Make sure you have correct access to `/dev/ttyUSBx` device and `ftdi_sio` and `usbserial` modules are loaded (only on Linux OS).
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#### *`primer.py` threw `SDRAM test error...` message*
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This issue shows up when there's a problem with the connection to the SDRAM chip or the chip itself is malfunctioning.
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Check for any solder bridges and unconnected pins on U8/U9 chips.
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Once FPGA and microcontroller has been programmed successfully `primer.py` script needs to be run in special mode.
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Please use command `python3 primer.py COMx sc64-firmware-{version}.bin --bootloader-only` to test SDRAM again and continue bootloader programming process.
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#### *`primer.py` threw other error message*
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Due to multiple possible causes of the problem it's best to start visually inspecting SC64's board for any defects, like bad solder work or chips soldered backwards.
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If visual inspection didn't yield any obvious culprits then next step would be to check if everything is connected correctly.
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Check if TX/RX signals aren't swapped and if SC64 is getting power from the USB cable. Best place to check supply voltage are the exposed test pads on the left of U8 chip.
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If everything at this point was checked and looked fine, then feel free to open new thread in the [*Discussions*](https://github.com/Polprzewodnikowy/SummerCart64/discussions) tab.
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Make sure to describe your problem extensively, attach SC64 board photos **from the both sides**, and paste all logs/screenshots from the `primer.py` output.
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