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Posted

I switched mentioned pins to IN mode. And it is seems they are pulled up by default.

+-----+-----+----------+------+---+-Orange Pi+---+---+------+---------+-----+--+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 |     |     |     3.3v |      |   |  1 || 2  |   |      | 5v       |     |     |
 |  12 |   8 |    SDA.0 |   IN | 1 |  3 || 4  |   |      | 5V       |     |     |
 |  11 |   9 |    SCL.0 |   IN | 1 |  5 || 6  |   |      | 0v       |     |     |

If physically connect that pins to the ground it shows 0 level. But I need it 0 by default.

All other pins which are not related to I2C/TWI I can easilly pullup/pulldown, but these not.

i2c0 is disabled in armbiaEnv.txt

Thank you.
 

Posted

If I understand correctly PA11 and PA12 are connected to +3.3V through 2.2k resistor on Orange Pi PC Plus. That means that it is impossible to use internal pull-up. 

Снимок экрана в 2023-06-27 13-30-25.png

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