I'm trying to make a python library for dynamically making a UART interface between a PC and FPGA using pySerial using myHDL 1.0dev
It takes names for datatypes and their properties, and instantiates a RAM block, as well as allow access to read/write commands on the PC. However, I'm running into problems dynamically wiring the RAMs.
For a minimal working example, I have these two classes.
class RamBus(object):
def __init__(self):
self.clk = Signal(bool(0))
class UartBus(object):
def __init__(self):
self.interfaces = dict()
def add(self, name, bus):
self.interfaces[name] = bus
setattr(self,name,bus)
UartBus is for holding many RamBuses. Now I'll try to dynamically connect them with the arbiter
block.
@block
def arbiter(clk,uartbus):
modules = []
for key in uartbus.interfaces:
print key
@block
def electrician(rambus=uartbus.interfaces[key]):
@always_comb
def wiring():
rambus.clk.next = clk
return wiring
f = electrician
modules.append(electrician())
return modules
If I convert it with this code, I get an incorrect conversion
uartbus = UartBus()
uartbus.add('power',RamBus())
uartbus.add('freq',RamBus())
#attempt conversion
clk = Signal(bool(0))
arbiter(clk,uartbus).convert()
Here's the incorrect verilog.
`timescale 1ns/10ps
module arbiter (
clk
);
input clk;
wire electrician_0_rambus_clk;
wire electrician_0_rambus_clk;
assign electrician_0_rambus_clk = clk;
assign electrician_0_rambus_clk = clk;
endmodule
And both wires have the same name! Using dictionaries in side the @always_comb doesn't work because dictionaries aren't supported by any version of myHDL so far for conversion. How do I correctly implement dynamic wiring?
So I found out the answer, while I was writing this, and since I think its a useful trick to know I decided to post the question anyways.
@block
def arbiter(clk,uartbus):
modules = []
for key in uartbus.interfaces:
#note that there is no @block here!
def electrician(rambus=uartbus.interfaces[key]):
@always_comb
def wiring():
rambus.clk.next = clk
return wiring
#here we can redefine the name that electrician
#has so that myHDL converts it with that name.
electrician.func_name = key
#then we apply the block decorator
electrician = block(electrician)
modules.append(electrician())
print key
return modules
And here is the correct verilog.
// File: arbiter.v
// Generated by MyHDL 1.0dev
// Date: Tue Jun 28 14:03:01 2016
`timescale 1ns/10ps
module arbiter (
clk
);
input clk;
wire freq_0_rambus_clk;
wire power_0_rambus_clk;
assign freq_0_rambus_clk = clk;
assign power_0_rambus_clk = clk;
endmodule
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