Using hardware I2C on an ESP32 ... found a nice hack — just connect your devices to different pins and slightly abuse the ESP32 GPIO muxing, no extra hardware required! Initially, they tried ...

例如，调用 i2c_get_timeout() 来检查 I2C 超时值。 通过函数 i2c_set_pin() 可以为 SDA 和 SCL 信号选择不同的管脚并改变上拉配置。如果要修改已经输入的值，请使用函数 i2c_param_config()。 ESP32 的内部上拉电阻范围为几万欧姆，因此在大多数情况下，它们本身不足以 ...

We usually require more pins, but if medium-sized ESP32-C3 modules are priced near ... So you design in an external ADC chip and connect it via I2C, or you tack on a shift register and drive ...

and the XTAL_32K_P and XTAL_32K_N pins are used as GPIO0 and GPIO1). The ESP32-C61 will be supported by the ESP-IDF 5.4 which is yet to be released (now Release Candidate 1) but should be fairly soon.

We made something similar but using the RP2350A board, the Raspberry Pi Pico 2, and published a guide on how to get Wi-Fi on the Pico 2 using an ESP32 ... with more GPIO pins than the RP2350A ...