kopia lustrzana https://github.com/micropython/micropython
303 wiersze
8.0 KiB
Python
303 wiersze
8.0 KiB
Python
# rp2 module: uses C code from _rp2, plus asm_pio decorator implemented in Python.
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# MIT license; Copyright (c) 2020-2021 Damien P. George
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from _rp2 import *
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from micropython import const
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_PROG_DATA = const(0)
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_PROG_OFFSET_PIO0 = const(1)
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_PROG_OFFSET_PIO1 = const(2)
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_PROG_EXECCTRL = const(3)
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_PROG_SHIFTCTRL = const(4)
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_PROG_OUT_PINS = const(5)
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_PROG_SET_PINS = const(6)
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_PROG_SIDESET_PINS = const(7)
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_PROG_MAX_FIELDS = const(8)
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class PIOASMError(Exception):
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pass
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class PIOASMEmit:
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def __init__(
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self,
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*,
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out_init=None,
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set_init=None,
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sideset_init=None,
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in_shiftdir=0,
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out_shiftdir=0,
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autopush=False,
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autopull=False,
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push_thresh=32,
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pull_thresh=32,
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fifo_join=0,
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):
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# array is a built-in module so importing it here won't require
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# scanning the filesystem.
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from array import array
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self.labels = {}
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execctrl = 0
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shiftctrl = (
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fifo_join << 30
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| (pull_thresh & 0x1F) << 25
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| (push_thresh & 0x1F) << 20
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| out_shiftdir << 19
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| in_shiftdir << 18
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| autopull << 17
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| autopush << 16
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)
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self.prog = [array("H"), -1, -1, execctrl, shiftctrl, out_init, set_init, sideset_init]
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self.wrap_used = False
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if sideset_init is None:
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self.sideset_count = 0
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elif isinstance(sideset_init, int):
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self.sideset_count = 1
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else:
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self.sideset_count = len(sideset_init)
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def start_pass(self, pass_):
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if pass_ == 1:
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if not self.wrap_used and self.num_instr:
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self.wrap()
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self.delay_max = 31
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if self.sideset_count:
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self.sideset_opt = self.num_sideset != self.num_instr
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if self.sideset_opt:
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self.prog[_PROG_EXECCTRL] |= 1 << 30
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self.sideset_count += 1
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self.delay_max >>= self.sideset_count
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self.pass_ = pass_
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self.num_instr = 0
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self.num_sideset = 0
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def __getitem__(self, key):
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return self.delay(key)
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def delay(self, delay):
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if self.pass_ > 0:
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if delay > self.delay_max:
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raise PIOASMError("delay too large")
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self.prog[_PROG_DATA][-1] |= delay << 8
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return self
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def side(self, value):
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self.num_sideset += 1
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if self.pass_ > 0:
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if self.sideset_count == 0:
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raise PIOASMError("no sideset")
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elif value >= (1 << self.sideset_count):
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raise PIOASMError("sideset too large")
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set_bit = 13 - self.sideset_count
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self.prog[_PROG_DATA][-1] |= self.sideset_opt << 12 | value << set_bit
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return self
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def wrap_target(self):
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self.prog[_PROG_EXECCTRL] |= self.num_instr << 7
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def wrap(self):
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assert self.num_instr
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self.prog[_PROG_EXECCTRL] |= (self.num_instr - 1) << 12
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self.wrap_used = True
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def label(self, label):
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if self.pass_ == 0:
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if label in self.labels:
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raise PIOASMError("duplicate label {}".format(label))
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self.labels[label] = self.num_instr
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def word(self, instr, label=None):
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self.num_instr += 1
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if self.pass_ > 0:
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if label is None:
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label = 0
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else:
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if label not in self.labels:
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raise PIOASMError("unknown label {}".format(label))
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label = self.labels[label]
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self.prog[_PROG_DATA].append(instr | label)
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return self
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def nop(self):
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return self.word(0xA042)
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def jmp(self, cond, label=None):
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if label is None:
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label = cond
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cond = 0 # always
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return self.word(0x0000 | cond << 5, label)
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def wait(self, polarity, src, index):
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if src == 6:
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src = 1 # "pin"
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elif src != 0:
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src = 2 # "irq"
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return self.word(0x2000 | polarity << 7 | src << 5 | index)
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def in_(self, src, data):
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if not 0 < data <= 32:
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raise PIOASMError("invalid bit count {}".format(data))
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return self.word(0x4000 | src << 5 | data & 0x1F)
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def out(self, dest, data):
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if dest == 8:
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dest = 7 # exec
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if not 0 < data <= 32:
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raise PIOASMError("invalid bit count {}".format(data))
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return self.word(0x6000 | dest << 5 | data & 0x1F)
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def push(self, value=0, value2=0):
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value |= value2
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if not value & 1:
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value |= 0x20 # block by default
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return self.word(0x8000 | (value & 0x60))
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def pull(self, value=0, value2=0):
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value |= value2
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if not value & 1:
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value |= 0x20 # block by default
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return self.word(0x8080 | (value & 0x60))
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def mov(self, dest, src):
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if dest == 8:
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dest = 4 # exec
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return self.word(0xA000 | dest << 5 | src)
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def irq(self, mod, index=None):
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if index is None:
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index = mod
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mod = 0 # no modifiers
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return self.word(0xC000 | (mod & 0x60) | index)
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def set(self, dest, data):
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return self.word(0xE000 | dest << 5 | data)
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_pio_funcs = {
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# source constants for wait
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"gpio": 0,
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# "pin": see below, translated to 1
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# "irq": see below function, translated to 2
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# source/dest constants for in_, out, mov, set
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"pins": 0,
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"x": 1,
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"y": 2,
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"null": 3,
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"pindirs": 4,
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"pc": 5,
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"status": 5,
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"isr": 6,
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"osr": 7,
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"exec": 8, # translated to 4 for mov, 7 for out
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# operation functions for mov's src
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"invert": lambda x: x | 0x08,
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"reverse": lambda x: x | 0x10,
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# jmp condition constants
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"not_x": 1,
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"x_dec": 2,
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"not_y": 3,
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"y_dec": 4,
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"x_not_y": 5,
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"pin": 6,
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"not_osre": 7,
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# constants for push, pull
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"noblock": 0x01,
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"block": 0x21,
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"iffull": 0x40,
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"ifempty": 0x40,
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# constants and modifiers for irq
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# "noblock": see above
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# "block": see above
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"clear": 0x40,
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"rel": lambda x: x | 0x10,
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# functions
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"wrap_target": None,
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"wrap": None,
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"label": None,
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"word": None,
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"nop": None,
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"jmp": None,
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"wait": None,
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"in_": None,
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"out": None,
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"push": None,
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"pull": None,
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"mov": None,
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"irq": None,
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"set": None,
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}
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def asm_pio(**kw):
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emit = PIOASMEmit(**kw)
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def dec(f):
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nonlocal emit
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gl = _pio_funcs
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gl["wrap_target"] = emit.wrap_target
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gl["wrap"] = emit.wrap
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gl["label"] = emit.label
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gl["word"] = emit.word
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gl["nop"] = emit.nop
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gl["jmp"] = emit.jmp
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gl["wait"] = emit.wait
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gl["in_"] = emit.in_
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gl["out"] = emit.out
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gl["push"] = emit.push
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gl["pull"] = emit.pull
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gl["mov"] = emit.mov
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gl["irq"] = emit.irq
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gl["set"] = emit.set
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old_gl = f.__globals__.copy()
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f.__globals__.clear()
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f.__globals__.update(gl)
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emit.start_pass(0)
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f()
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emit.start_pass(1)
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f()
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f.__globals__.clear()
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f.__globals__.update(old_gl)
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return emit.prog
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return dec
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# sideset_count is inclusive of enable bit
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def asm_pio_encode(instr, sideset_count, sideset_opt=False):
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emit = PIOASMEmit()
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emit.sideset_count = sideset_count
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emit.sideset_opt = sideset_opt != 0
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emit.delay_max = 31 >> (emit.sideset_count + emit.sideset_opt)
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emit.pass_ = 1
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emit.num_instr = 0
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emit.num_sideset = 0
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gl = _pio_funcs
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gl["word"] = emit.word
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gl["nop"] = emit.nop
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# gl["jmp"] = emit.jmp currently not supported
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gl["wait"] = emit.wait
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gl["in_"] = emit.in_
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gl["out"] = emit.out
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gl["push"] = emit.push
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gl["pull"] = emit.pull
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gl["mov"] = emit.mov
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gl["irq"] = emit.irq
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gl["set"] = emit.set
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exec(instr, gl)
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if len(emit.prog[_PROG_DATA]) != 1:
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raise PIOASMError("expecting exactly 1 instruction")
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return emit.prog[_PROG_DATA][0]
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