こんな表があってもいいかも？

[tanakamasayuki]

I2C GPIO

	M5Stack BASIC/GRAY GO/FIRE	M5Stack Core2/Tough	M5Stick C/Cplus	M5Stack CoreInk	M5Paper	M5Station	M5ATOM Lite/Matrix ECHO/U PSRAM	M5STAMP PICO	M5Stamp C3/C3U	M5Stack CoreS3	M5ATOMS3 / S3Lite
PORT.A I2C_SDA	21	32	32	32	25	32	26	32	1	2	2
PORT.A I2C_SCL	22	33	33	33	32	33	32	33	0	1	1
I2C1_SDA		21	21	21	21	21	22			12	38
I2C1_SCL		22	22	22	22	22	25			11	39

|                         | M5Stack<BR>BASIC/GRAY<BR>GO/FIRE | M5Stack<BR>Core2/Tough | M5Stick<BR>C/Cplus | M5Stack<BR>CoreInk | M5Paper | M5Station | M5ATOM<BR>Lite/Matrix<BR>ECHO/U<BR>PSRAM | M5STAMP<BR>PICO | M5Stamp<BR>C3/C3U | M5Stack<BR>CoreS3 | M5ATOMS3 <BR>/ S3Lite |
|-------------------------|:--------------------------------:|:----------------------:|:------------------:|:------------------:|:-------:|:---------:|:----------------------------------------:|:---------------:|:-----------------:|:-----------------:|:---------------------:|
| `PORT.A`<BR>**I2C_SDA** | 21                               | 32                     | 32                 | 32                 | 25      | 32        | 26                                       | 32              | 1                 | 2                 | 2                     |
| `PORT.A`<BR>**I2C_SCL** | 22                               | 33                     | 33                 | 33                 | 32      | 33        | 32                                       | 33              | 0                 | 1                 | 1                     |
| **I2C1_SDA**            |                                  | 21                     | 21                 | 21                 | 21      | 21        | 22                                       |                 |                   | 12                | 38                    |
| **I2C1_SCL**            |                                  | 22                     | 22                 | 22                 | 22      | 22        | 25                                       |                 |                   | 11                | 39                    |

[lovyan03]

なるほど、これは良いですね…！