Hi Trumany,
The voltage level of LAUNCHXL is 3.3v and it’s connected through a USB cable to the Jetson.
Yes, I ran some tests yesterday and took screenshots. I changed the slave address to 0x03 (the first address i2cdetect checks) to capture the issue. When the LAUNCHXL is not connected, this is what I get (SDA yellos, SCL blue):
when the LAUNCHXL is connected, this is what I get:
So apart from the voltage level that jumps to 3.3v for logic high, the ACK bit is set and bus is pulled down after the transmission. If I understand the I2C protocol correctly, the ACK bit is set by slave (LAUNHXL) and Read/Write bit is set by master, so in this case Read/Write=1 and ACK=1 which means the slave is supposed to send data and that’s the reason the bus is pulled down by slave, but apparently slave is not sending anything after that.
Not sure if my assumptions are right.
–Kash