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Altera_Forum
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9 years ago

opencores i2c master generates no output

Hi, I'm new to FPGA's. I had used the altera IP's and evrything went well until I tried to use the opencores I2C master. With the DE0-nano board I want commucate via the GPIO_06 and GPIO_05 on an ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

After changing the SDA and the SCL from one into two seperate conduit interfaces, the i2c_start function doesn't get stuck anymore. But on the bus lines I still can't see any signals so that the I2C-Controller always receives a NACK.

Has it maybe something to do with the pin configuration? I'm using GPIO_06 for SCL (pin A4 on the FPGA) as an output. SDA is on GPIO_05 (pin B4 on the FPGA) as birdirectional pin. For both pins I have assigned 3.3-V LVTTL as I/O-Standard in the pin planner.

With this bus I want to communicate with a few TMP112 devices.