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https://github.com/nopnop2002/esp-idf-ssd1306.git
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64 lines
3.8 KiB
Markdown
64 lines
3.8 KiB
Markdown
# ESP32S2 Mini Multi PCB
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Several products of ESP32 equipped with SSD1306 are available.
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However, I have never seen a product equipped with an SSD1306 with an SPI interface.
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Also, I have never seen a product equipped with a 1.3 inch SSD1306 product.
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Therefore, I designed a PCB that can be equipped with an SPI interface and 1.3 inch products.
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I use ESP32S2-Mini Development board.
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Although this product is very small, it is equipped with 2MB of PSRAM.
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You can download the Garbers file from [here](https://www.pcbway.com/project/shareproject/esp32s2_ssd1306_multi_pcb_2d6e5b26.html).
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You can use the zip file to order it yourself from PCB manufacturing vendors such as Elecrow/FusionPCB/PCBWay.
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I ordered it on 3/31 and it arrived on 4/9.
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You can repeat my order from [here](https://www.pcbway.com/project/shareproject/esp32s2_ssd1306_multi_pcb_2d6e5b26.html).
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# Configuration
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for SPI interface
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for I2C interface
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# Why ESP32S2 Mini?
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Cheap!!
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Only $1.49 excluding shipping.
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I bought two and it cost $4.27 including shipping.
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# About ESP32S2 Mini
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A Type-C USB connector is mounted on the board, but a USB-TTL conversion chip is not mounted.
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The circuit diagram is available [here](https://www.wemos.cc/en/latest/_static/files/sch_s2_mini_v1.0.0.pdf).
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USB ports D- and D+ are connected to GPIO19/20.
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Since it uses the chip's USB-OTG function, it will not be recognized as a USB device even if you simply connect it to the host with a USB cable.
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To write firmware, press ButtonRST while pressing Button0, then release ButtonRST and then Button0.
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Now the device will enter DFU mode, the USB device (/dev/ttyACM0) will appear, and you can upload the firmware.
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Once the firmware upload is complete, press ButtonRST again.
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The firmware will now start.
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If you press ButtonRST without pressing Button0, the USB device will disappear.
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In other words, USB can be used for writing, but not for STDOUT.
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This board is not suitable for debugging.
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On ESP32-S2, GPIO43/44 are U0TXD/U0RXD, but this GPIO is not present on the pin header.
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This board has 4MB of FLASH and ___2MB of PSRAM___.
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It's strange that it is recognized as having an external flash.
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There is no external flash anywhere on the board.
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# Enable PSRAM
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ESP32S2's RAM is very small.
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You can avoid running out of memory by enabling PSRAM.
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In order to use PSRAM, you need to enable PSRAM by following the steps below.
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Please note that this procedure is for ESP-IDF V5.2 and may change in the future.
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