src/spec/testing_stage1.py

   1 #!/usr/bin/env python3
   2 from nmigen.build.dsl import Resource, Subsignal, Pins
   3 from nmigen.build.plat import TemplatedPlatform
   4 from nmigen import Elaboratable, Signal, Module
   5 from collections import OrderedDict
   6
   7 # Was thinking of using these functions, but skipped for simplicity for now
   8 # XXX nope.  the output from JSON file.
   9 #from pinfunctions import (i2s, lpc, emmc, sdmmc, mspi, mquadspi, spi,
  10 # quadspi, i2c, mi2c, jtag, uart, uartfull, rgbttl, ulpi, rgmii, flexbus1,
  11 # flexbus2, sdram1, sdram2, sdram3, vss, vdd, sys, eint, pwm, gpio)
  12
  13 # File for stage 1 pinmux tested proposed by Luke,
  14 # https://bugs.libre-soc.org/show_bug.cgi?id=50#c10
  15
  16
  17 def dummy_pinset():
  18     # sigh this needs to come from pinmux.
  19     gpios = []
  20     for i in range(16):
  21         gpios.append("%d*" % i)
  22     return {'uart': ['tx+', 'rx-'],
  23             'gpio': gpios,
  24             'i2c': ['sda*', 'scl+']}
  25
  26 """
  27 a function is needed which turns the results of dummy_pinset()
  28 into:
  29
  30 [UARTResource("uart", 0, tx=..., rx=..),
  31  I2CResource("i2c", 0, scl=..., sda=...),
  32  Resource("gpio", 0, Subsignal("i"...), Subsignal("o"...)
  33  Resource("gpio", 1, Subsignal("i"...), Subsignal("o"...)
  34  ...
  35 ]
  36 """
  37
  38
  39 def create_resources(pinset):
  40     resources = []
  41     for periph, pins in pinset.items():
  42         print(periph, pins)
  43         if periph == 'i2c':
  44             #print("I2C required!")
  45             resources.append(I2CResource('i2c', 0, sda='sda', scl='scl'))
  46         elif periph == 'uart':
  47             #print("UART required!")
  48             resources.append(UARTResource('uart', 0, tx='tx', rx='rx'))
  49         elif periph == 'gpio':
  50             #print("GPIO required!")
  51             print ("GPIO is defined as '*' type, meaning i, o and oe needed")
  52             ios = []
  53             for pin in pins:
  54                 pname = "gpio"+pin[:-1] # strip "*" on end
  55                 ios.append(Subsignal(pname, Pins(pname, assert_width=1)))
  56             resources.append(Resource.family(periph, 0, default_name="gpio",
  57                                              ios=ios))
  58     return resources
  59
  60
  61 def UARTResource(*args, rx, tx):
  62     io = []
  63     io.append(Subsignal("rx", Pins(rx, dir="i", assert_width=1)))
  64     io.append(Subsignal("tx", Pins(tx, dir="o", assert_width=1)))
  65     return Resource.family(*args, default_name="uart", ios=io)
  66
  67
  68 def I2CResource(*args, scl, sda):
  69     io = []
  70     io.append(Subsignal("scl", Pins(scl, dir="io", assert_width=1)))
  71     io.append(Subsignal("sda", Pins(sda, dir="io", assert_width=1)))
  72     return Resource.family(*args, default_name="i2c", ios=io)
  73
  74
  75 # ridiculously-simple top-level module.  doesn't even have a sync domain
  76 # and can't have one until a clock has been established by DummyPlatform.
  77 class Blinker(Elaboratable):
  78     def __init__(self):
  79         pass
  80     def elaborate(self, platform):
  81         m = Module()
  82         count = Signal(5)
  83         m.d.comb += count.eq(5)
  84         print ("resources", platform.resources.items())
  85         gpio = platform.request("gpio", 0)
  86         print (gpio, gpio.layout, gpio.fields)
  87         # get the GPIO bank, mess about with some of the pins
  88         m.d.comb += gpio.gpio0.o.eq(1)
  89         m.d.comb += gpio.gpio1.o.eq(gpio.gpio2.i)
  90         # get the UART resource, mess with the output tx
  91         uart = platform.request("uart", 0)
  92         print (uart, uart.fields)
  93         m.d.comb += uart.tx.eq(1)
  94         return m
  95
  96
  97 '''
  98     _trellis_command_templates = [
  99         r"""
 100         {{invoke_tool("yosys")}}
 101             {{quiet("-q")}}
 102             {{get_override("yosys_opts")|options}}
 103             -l {{name}}.rpt
 104             {{name}}.ys
 105         """,
 106     ]
 107 '''
 108
 109 # sigh, have to create a dummy platform for now.
 110 # TODO: investigate how the heck to get it to output ilang. or verilog.
 111 # or, anything, really.  but at least it doesn't barf
 112 class DummyPlatform(TemplatedPlatform):
 113     connectors = []
 114     resources = OrderedDict()
 115     required_tools = []
 116     command_templates = ['/bin/true']
 117     file_templates = {
 118         **TemplatedPlatform.build_script_templates,
 119         "{{name}}.il": r"""
 120             # {{autogenerated}}
 121             {{emit_rtlil()}}
 122         """,
 123         "{{name}}.debug.v": r"""
 124             /* {{autogenerated}} */
 125             {{emit_debug_verilog()}}
 126         """,
 127     }
 128     toolchain = None
 129     def __init__(self, resources):
 130         super().__init__()
 131         self.add_resources(resources)
 132
 133 """
 134 and to create a Platform instance with that list, and build
 135 something random
 136
 137    p=Platform()
 138    p.resources=listofstuff
 139    p.build(Blinker())
 140 """
 141 pinset = dummy_pinset()
 142 resources = create_resources(pinset)
 143 print(pinset)
 144 print(resources)
 145 p = DummyPlatform (resources)
 146 p.build(Blinker())
 147