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Adding more sections.
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README.md
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README.md
@ -607,7 +607,9 @@ There is an additional RISC-V demo in the workshop. The `riscv-usb-cdcacm` dire
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The two most common **H**ardware **D**escription **Language** are Verilog and VHDL (the toolchain we are using only supports Verilog).
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### Verilog "Hello world!"
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### Verilog
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#### "Hello world!" - Blink an LED
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The canonical "Hello, world!" of hardware is to blink an LED. The directory `verilog-blink` contains a Verilog example of a blink project. This takes the 48 MHz clock and divides it down by a large number so you get an on/off pattern. It also exposes some of the signals on the touchpads, making it possible to probe them with an oscilloscope.
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@ -667,7 +669,13 @@ You can load `blink.bin` onto Fomu by using the same `dfu-util -D` command we've
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### Migen and LiteX
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Recall that Migen is an HDL embedded in Python, and LiteX provides us with a Wishbone abstraction layer. There really is no reason we need to include a CPU with our design, but we can still reuse the USB Wishbone bridge in order to write HDL code.
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#### "Hello world!" - Blink an LED
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FIXME: Add the Migen and LiteX equivalent for the Verilog above.
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#### Wishbone Bus
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Migen is an HDL embedded in Python, and LiteX provides us with a Wishbone abstraction layer. There really is no reason we need to include a CPU with our design, but we can still reuse the USB Wishbone bridge in order to write HDL code.
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We can use `DummyUsb` to respond to USB requests and bridge USB to Wishbone, and rely on LiteX to generate registers and wire them to hardware signals. We can still use `wishbone-tool` to read and write memory, and with a wishbone bridge we can actually have code running on our local system that can read and write memory on Fomu.
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