UART Connectivity to OSx using the Lattice iCE40 HX

Help Request
1

I am running the demo titled ‘Hello World - Prints “Hello World” when ‘h’ is received over the UART port”

The documentation for this demo is no longer available:

https://alchitry.com/tutorials/verilog/mojo/hello-world/

I wanted to know what is the correct baud rate I should use for connecting via UART to the board. I’ve used the following command:

screen /dev/tty.usbserial-FT4MG9OV0 1000000

To match the pre-defined coded example and I have also used the 115200 rate and changed the code to match this rate:

        .rst(rst) {
            greeter greeter // instance of our greeter
            uart_rx uart_rx(#BAUD(115_200), #CLK_FREQ(100_000_000))
            uart_tx uart_tx(#BAUD(115_200), #CLK_FREQ(100_000_000))
        }

But cannot seem to get connectivity. Can someone please provide any examples or guidance on how to make this successful or any other “Hello World” examples?

Best regards

2

Hello,

If you need, the old tutorial you are referring to is still available here :

You can find updated tutorials here (but these are written in Lucid instead of Verilog) :
UART :

Hello world over UART :

3

I am looking for help to use this on an OSX operating system: I’m looking for the right parameters to use e.g. baud rates etc

4

The baudrate should be the one specified in the BAUD parameter on the FPGA side : BAUD(115_200) => 115200 bauds and with this tutorials it’s 8 data bits and 1 stop bit, no parity and no hardware control.