src/bsv/peripheral_gen/spi.py

   1 from bsv.peripheral_gen.base import PBase
   2
   3 class spi(PBase):
   4
   5     def slowimport(self):
   6         return "    import qspi              :: *;"
   7
   8     def slowifdecl(self):
   9         return "            interface QSPI_out spi{0}_out;\n" + \
  10                "            method Bit#(1) spi{0}_isint;"
  11
  12     def num_axi_regs32(self):
  13         return 13
  14
  15     def mkslow_peripheral(self):
  16         return "        Ifc_qspi spi{0} <-  mkqspi();"
  17
  18     def _mk_connection(self, name=None, count=0):
  19         return "spi{0}.slave"
  20
  21     def pinname_out(self, pname):
  22         return {'clk': 'out.clk_o',
  23                 'nss': 'out.ncs_o',
  24                 'mosi': 'out.io_o[0]',
  25                 'miso': 'out.io_o[1]',
  26                 }.get(pname, '')
  27
  28     def pinname_outen(self, pname):
  29         return {'clk': 1,
  30                 'nss': 1,
  31                 'mosi': 'out.io_enable[0]',
  32                 'miso': 'out.io_enable[1]',
  33                 }.get(pname, '')
  34
  35     def mk_pincon(self, name, count):
  36         ret = [PBase.mk_pincon(self, name, count)]
  37         # special-case for gpio in, store in a temporary vector
  38         plen = len(self.peripheral.pinspecs)
  39         ret.append("    // XXX NSS and CLK are hard-coded master")
  40         ret.append("    // TODO: must add spi slave-mode")
  41         ret.append("    // all ins done in one rule from 4-bitfield")
  42         ret.append("    rule con_%s%d_io_in;" % (name, count))
  43         ret.append("       {0}{1}.out.io_i({{".format(name, count))
  44         for idx, pname in enumerate(['mosi', 'miso']):
  45             sname = self.peripheral.pname(pname).format(count)
  46             ps = "pinmux.peripheral_side.%s_in" % sname
  47             ret.append("            {0},".format(ps))
  48         ret.append("            1'b0,1'b0")
  49         ret.append("        });")
  50         ret.append("    endrule")
  51         return '\n'.join(ret)
  52
  53     def mk_ext_ifacedef(self, iname, inum):
  54         name = self.get_iname(inum)
  55         return "        method {0}_isint = {0}.interrupts[5];".format(name)
  56
  57     def slowifdeclmux(self):
  58         return "        method Bit#(1) {1}{0}_isint;"
  59
  60