Sub Functions
DAC
- IO25 IO26
Note
Input only
- 36/39/34/35
Strapping
ESP32 共有 5 个 Strapping 管脚，可参考章节 6 电路原理图：
| Func. | IO | default |
|---|---|---|
| MTDI | 12 | pull-down |
| GPIO | 0 | pull-up |
| GPIO | 2 | pull-down |
| MTDO | 15 | |
| GPIO | 5 |
regarding GPIO20
for newer ESP32 variants
- Enable IO20 on ESP32
- Some newer ESP32 variants (like ESP32-PICO-V3 and ESP32-PICO-MINI-02) do implement this pin and it can be used as a normal GPIO.
https://github.com/espressif/esp-idf/commit/6deaefde69c3f068d39b76d628b05b21fd142b79
for classic ESP32
- IO20 = NC