87 lines
2.2 KiB
Markdown
87 lines
2.2 KiB
Markdown
This example is for the
|
|
[Lattice iCE40HX-8K Breakout Board](http://www.latticesemi.com/Products/DevelopmentBoardsAndKits/iCE40HX8KBreakoutBoard.aspx).
|
|
|
|
An image of this board is shown below;
|
|
|
|
|
|
|
|
This board can be purchased for ~$USD 49 directly from Lattice and is supported
|
|
by the IceStorm
|
|
[`iceprog`](https://github.com/cliffordwolf/icestorm/tree/master/iceprog) tool.
|
|
|
|
|
|
# Using the example
|
|
|
|
## Before Starting
|
|
|
|
Before starting make sure that your board is configured for `CRAM Programming`
|
|
mode. This requires removing jumper `J7` and putting the pair of jumpers on
|
|
`J6` to be parallel to the text on the board.
|
|
|
|
This is shown in **Figure 5** of the
|
|
[iCE40HX-8K Breakout Board User Guide](http://www.latticesemi.com/view_document?document_id=50373).
|
|
which is also reproduced below;
|
|
|
|
|
|
|
|
Once your board is ready, you should follow the setup instructions at the
|
|
[top level](../../../README.md).
|
|
|
|
You should make sure you have the following tools installed;
|
|
* Yosys
|
|
* arachne-pnr
|
|
* icestorm tools (like icepack and iceprog)
|
|
* riscv toolchain
|
|
* sbt
|
|
|
|
## Building
|
|
|
|
You should be able to just type `make compile` and get output similar to this;
|
|
```
|
|
...
|
|
place time 10.14s
|
|
route...
|
|
pass 1, 15 shared.
|
|
pass 2, 4 shared.
|
|
pass 3, 1 shared.
|
|
pass 4, 0 shared.
|
|
|
|
After routing:
|
|
span_4 4406 / 29696
|
|
span_12 951 / 5632
|
|
|
|
route time 9.12s
|
|
write_txt bin/toplevel.asc...
|
|
icepack bin/toplevel.asc bin/toplevel.bin
|
|
```
|
|
|
|
The process should take around 30 seconds on a reasonable fast computer.
|
|
|
|
## Programming
|
|
|
|
After building you should be able to run `make prog`. You may need to run `make
|
|
sudo-prog` if root is needed to access your USB devices.
|
|
|
|
You should get output like the following;
|
|
```
|
|
iceprog -S bin/toplevel.bin
|
|
init..
|
|
cdone: high
|
|
reset..
|
|
cdone: low
|
|
programming..
|
|
cdone: high
|
|
Bye.
|
|
```
|
|
|
|
After programming the LEDs at the top of the board should start flashing in an
|
|
interesting pattern.
|
|
|
|
## Connect
|
|
|
|
After programming you should be able to connect to the serial port and have the
|
|
output echoed back to you.
|
|
|
|
On Linux you can do this using a command like `screen /dev/ttyUSB1`. Then as
|
|
you type you should get back the same characters.
|