I use the SMBUS external I2C slave on the computer, using oscilloscope waveform is strange, as the chart, and the slave device only received an address, Host error, error code - 6,
I look at the smbus host test driver, and 6 is no response equipment, this is what problem? External pull-up is 1 k, pull on the power supply is 3.3 V on the PCIE,

CodePudding user response:

Level is lower, it should be 3.3 v, when sending data is only 2.1 v,