milkymist/uart/__init__.py

   1 from migen.fhdl import structure as f
   2 from migen.bus import csr
   3
   4 class Inst:
   5         def __init__(self, csr_addr, clk_freq, baud=115200, break_en_default=f.Constant(0)):
   6                 self.bus = csr.Slave("uart")
   7                 f.Declare(self, "tx")
   8                 f.Declare(self, "rx")
   9                 f.Declare(self, "irq")
  10                 f.Declare(self, "brk")
  11                 self._inst = f.Instance("uart",
  12                         [("csr_do", self.bus.d_o),
  13                         ("uart_tx", self.tx),
  14                         ("irq", self.irq),
  15                         ("break", self.brk)],
  16                         [("csr_a", self.bus.a_i),
  17                         ("csr_we", self.bus.we_i),
  18                         ("csr_di", self.bus.d_i),
  19                         ("uart_rx", self.rx)],
  20                         [("csr_addr", f.Constant(csr_addr, f.BV(4))),
  21                         ("clk_freq", clk_freq),
  22                         ("baud", baud),
  23                         ("break_en_default", break_en_default)],
  24                         "sys_clk",
  25                         "sys_rst")
  26
  27         def GetFragment(self):
  28                 return f.Fragment(instances=[self._inst], pads={self.tx, self.rx})