Hello,

I think I tried many ways to transmit something out of the uart interface. But really I can not see anything at the output pins.

Yes I have already set up the jumpers J101 to J104 between PIN 1 and 2 and the SPI interface is also at the same pins and I got them to work as I expect. And yes because both interfaces are at the same pins of the fx3 I am using just one of them in the code.

Why is the uart not working?

Hi Lumpi6,

Please try the following to get UART to work on the FX3 DVK.

1. Connect PIN1&2 for J103 and J104.

2. In your application code, set the isDQ32Bit member of CyU3PIoMatrixConfig  structure to CyTrue before calling the CyU3PDeviceConfigureIOMatrix function.

Hi max08,

many thanks for your answer I already read about that in the datasheet and at the description of the function "CyU3PDeviceConfigureIOMatrix()" a hour ago.

At the moment I saw your answer I would have write my experince. ;-)

The function description of "CyU3PDeviceConfigureIOMatrix()" in cyu3system.h also says that you can not use the SPI interface if you are using GPIF in 32 bit mode.

quote: "If the GPIF is 32bit, then SPI module cannot be used."