https://github.com/nyh-workshop/esp32s3-ulp_riscv_i2clcd

Using an I2C LCD (AIP31068) on ESP32S3's RiscV ULP using Software I2C
https://github.com/nyh-workshop/esp32s3-ulp_riscv_i2clcd

aip31068 esp-idf esp32-s3 i2c-lcd riscv ulp

Last synced: 9 months ago
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Using an I2C LCD (AIP31068) on ESP32S3's RiscV ULP using Software I2C

• Host: GitHub
• URL: https://github.com/nyh-workshop/esp32s3-ulp_riscv_i2clcd
• Owner: nyh-workshop
• License: gpl-3.0
• Created: 2023-01-24T09:42:31.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2023-01-24T14:47:04.000Z (over 3 years ago)
• Last Synced: 2025-03-13T02:43:01.311Z (over 1 year ago)
• Topics: aip31068, esp-idf, esp32-s3, i2c-lcd, riscv, ulp
• Language: C
• Homepage:
• Size: 272 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# esp32s3-ulp_RiscV-hello

This is a demo code for I2C LCD (AIP31068) for the ESP32S3 ULP RiscV using software I2C.

The simple code drives the I2C 16x2 LCD (usually sold as [Grove 16x2 LCD](https://my.cytron.io/p-grove-16-x-2-lcd-white-on-blue)) with the AIP31068 controller on the ESP32-S3's RiscV ULP.

The code has been tested on [Cytron's Maker Feather AIOT S3](https://my.cytron.io/p-v-maker-feather-aiot-s3-simplifying-aiot-with-esp32?r=1).

The hardware I2C for the ULP is not accessible on this board (see page **479** and **480** on [ESP32-S3 Technical Reference Manual](https://www.espressif.com/sites/default/files/documentation/esp32-s3_technical_reference_manual_en.pdf)), software I2C is used.

Software I2C routines by PascalPolygon: [STM32 Software I2C](https://github.com/PascalPolygon/stm32_bitbang_i2c), modified for the RiscV ULP.

Since the ULP's RTC GPIO is only coupled up to GPIO 21, the example is using GPIO 4 and 7 instead.

After programming the board, press Reset button to run the ULP program.

![Board with I2C LCD](esp32s3-i2cLcd.jpg)

References:

- [ESP-IDF Example ULP RiscV GPIO](https://github.com/espressif/esp-idf/tree/db9586c53f31a65abf0a51cac7072d7750f7b073/examples/system/ulp_riscv/gpio)

- [STM32 Software I2C](https://github.com/PascalPolygon/stm32_bitbang_i2c)

- [AIP31068 Datasheet](https://support.newhavendisplay.com/hc/en-us/article_attachments/4414498095511/AiP31068.pdf)

Note: For [Cytron's Maker Feather AIOT S3](https://my.cytron.io/p-v-maker-feather-aiot-s3-simplifying-aiot-with-esp32?r=1) users using this SDK, please enable the GPIO11 first if you need to use the diagnostic LEDs on board!