i2c1 on luckfox pico max

• uli96

  Posts: 1

  Joined: 2025-12-24 13:55

  2025-12-24 14:06

  Hi, first post here.
  
  I'm trying to read a BME680 sensor, I connected to i2c1 (on i2c1_SDA_M1 pin 11 and i2c_SCL_M1 pin 17). I activated i2c1 and build and flashed the image, now I can see the device when doing a ls /dev/i2c1 but probing with "i2cdetect -y 1" gives me this:
  
  [root@luckfox root]# i2cdetect -y 1
  0 1 2 3 4 5 6 7 8 9 a b c d e f
  00: [ 76.992974] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 77.202986] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 77.412971] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 77.622974] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 77.832976] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 78.042972] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 78.252980] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 78.462979] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 78.672973] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 78.882971] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 79.092977] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 79.302973] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 79.512974] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  --
  10: [ 79.722975] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 79.932974] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 80.142971] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 80.352975] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 80.562976] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  -- [ 80.772988] rk3x-i2c ff320000.i2c: timeout, ipd: 0x00, state: 3
  
  Not what I expected, I checked the wiring and it is ok, pullups are on the beakout board, and it worked on another board without porblems. How does one use i2c on this board?

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