Can ESP32's I2C and SPI be mapped to any I/O?

littleshrimp

Can ESP32's I2C and SPI be mapped to any I/O? [Copy link]

 

This is my first time designing an ESP32 circuit. I found an ESP32-WROOM-32E.pdf (948.12 KB, downloads: 0)

2024-11-20 18:46 上传

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module. When I was about to connect I2C and SPI, I found that there were no related pins in the pin definition. As shown in the figure below, there are only GPIO, ADC, DAC, TOUCH, but no SPI, I2C, UART, and PWM.

wangerxian

Yes, IIC and SPI can be mapped arbitrarily.

wangerxian

However, there seems to be a limit on the number of serial ports, for example, only one can be used.

littleshrimp

wangerxian posted on 2024-11-20 19:13 Yes, IIC and SPI can be mapped arbitrarily.

Thank you. I feel relieved to paint boldly after hearing your words.

wangerxian

littleshrimp posted on 2024-11-20 19:15 Thank you, I feel relieved to paint boldly with your words

But you need to pay attention to some dedicated interfaces, especially the GPIO associated with downloading. I have suffered losses here before.

littleshrimp

wangerxian posted on 2024-11-20 19:27 But pay attention to some dedicated interfaces, especially the GPIO associated with downloads. I have suffered losses here before.

I see, it's that special serial port, right? Is there anything else I should pay attention to?

dcexpert

Not only IIC and SPI, UART, PWM, etc. are also possible. Just like wangerxian said, you need to pay attention to some special pins.

wangerxian

littleshrimp posted on 2024-11-20 19:29 I see, it's that special serial port, right? Is there anything else I need to pay attention to?

Yes, the downloaded serial port must be retained, and the other is the level status of the two GPIOs when powered on. You can check out this post of mine.

https://bbs.eeworld.com.cn/thread-1230381-1-1.html

littleshrimp

wangerxian posted on 2024-11-21 09:31 Yes, the serial port for downloading must be retained, and the other one is the level status of the two GPIOs when powered on. You can check out this post of mine. https://bb ...

OK