src/actual_pinmux.py

   1 from parse import *
   2 from string import digits
   3 try:
   4     from string import maketrans
   5 except ImportError:
   6     maketrans = str.maketrans
   7
   8
   9 # dictionary of properties of signals that are supported.
  10 dictionary = {
  11     "uart_rx"   : "input",
  12     "uart_tx"   : "output",
  13     "spi_sclk"  : "output",
  14     "spi_mosi"  : "output",
  15     "spi_ss"    : "output",
  16     "spi_miso"  : "input",
  17     "twi_sda"   : "inout",
  18     "twi_scl"   : "inout",
  19     "sd_clk": "output",
  20     "sd_cmd": "output",
  21     "sd_d": "inout",
  22     "pwm": "output"
  23 }
  24
  25
  26 # ============== common bsv templates ============ #
  27 # first argument is the io-cell number being assigned.
  28 # second argument is the mux value.
  29 # Third argument is the signal from the pinmap file
  30 mux_wire = '''
  31       rule assign_{2}_on_cell{0}(wrcell{0}_mux=={1});
  32         {2}<=cell{0}_mux_in;
  33       endrule
  34 '''
  35 dedicated_wire = '''
  36       rule assign_{1}_on_cell{0};
  37         {1}<=cell{0}_mux_in;
  38       endrule
  39 '''
  40 # ============================================================
  41 pinmux = ''' '''
  42 digits = maketrans('0123456789', ' '*10) # delete space later
  43
  44 def cn(idx):
  45     return "cell%s_mux" % str(idx)
  46
  47 for cell in muxed_cells:
  48     pinmux = pinmux + "      %s_out=" % cn(cell[0])
  49     i = 0
  50     while(i < len(cell) - 1):
  51         pinmux = pinmux + "wr%s" % cn(cell[0]) + \
  52              "==" + str(i) + "?" + cell[i + 1] + "_io:\n\t\t\t"
  53         if(i + 2 == len(cell) - 1):
  54             pinmux = pinmux + cell[i + 2] + "_io"
  55             i = i + 2
  56         else:
  57             i = i + 1
  58     pinmux = pinmux + ";\n"
  59     # ======================================================== #
  60
  61     # check each cell if "peripheral input/inout" then assign its wire
  62     # Here we check the direction of each signal in the dictionary.
  63     # We choose to keep the dictionary within the code and not user-input
  64     # since the interfaces are always standard and cannot change from
  65     # user-to-user. Plus this also reduces human-error as well :)
  66     for i in range(0, len(cell) - 1):
  67         temp = cell[i + 1].translate(digits)
  68         temp = temp.replace(' ', '')
  69         x = dictionary.get(temp)
  70         if(x is None):
  71             print(
  72               "ERROR: The signal : " +
  73               str(cell[i + 1]) +
  74               " of pinmap.txt isn't present in the current dictionary.\
  75               \nUpdate dictionary or fix-typo.")
  76             exit(1)
  77         if(x == "input"):
  78             pinmux = pinmux + \
  79               mux_wire.format(cell[0], i, "wr" + cell[i + 1]) + "\n"
  80         elif(x == "inout"):
  81             pinmux = pinmux + \
  82                 mux_wire.format(cell[0], i, "wr" + cell[i + 1] +
  83                                             "_in") + "\n"
  84 # ============================================================ #
  85
  86 # ==================  Logic for dedicated pins ========= #
  87 for cell in dedicated_cells:
  88     pinmux = pinmux + "      %s" % cn(cell[0]) + \
  89         "_out=" + cell[1] + "_io;\n"
  90     temp = cell[1].translate(digits)
  91     x = dictionary.get(temp)
  92     if(x == "input"):
  93         pinmux = pinmux + \
  94             dedicated_wire.format(cell[0], "wr" + cell[1]) + "\n"
  95     elif(x == "inout"):
  96         pinmux = pinmux + \
  97             dedicated_wire.format(cell[0], "wr" + cell[1] + "_in") + "\n"
  98 # =======================================================#