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}(wrmux{0}=={1});
  32         {2}<=cell{0}_in;
  33       endrule
  34 '''
  35 dedicated_wire = '''
  36       rule assign_{1}_on_cell{0};
  37         {1}<=cell{0}_in;
  38       endrule
  39 '''
  40 # ============================================================
  41 pinmux = ''' '''
  42 digits = maketrans('0123456789', ' '*10) # delete space later
  43
  44 for cell in muxed_cells:
  45     pinmux = pinmux + "      cell" + str(cell[0]) + "_out="
  46     i = 0
  47     while(i < len(cell) - 1):
  48         pinmux = pinmux + "wrmux" + \
  49             str(cell[0]) + "==" + str(i) + "?" + cell[i + 1] + "_io:"
  50         if(i + 2 == len(cell) - 1):
  51             pinmux = pinmux + cell[i + 2] + "_io"
  52             i = i + 2
  53         else:
  54             i = i + 1
  55     pinmux = pinmux + ";\n"
  56     # ======================================================== #
  57
  58     # check each cell if "peripheral input/inout" then assign its wire
  59     # Here we check the direction of each signal in the dictionary.
  60     # We choose to keep the dictionary within the code and not user-input
  61     # since the interfaces are always standard and cannot change from
  62     # user-to-user. Plus this also reduces human-error as well :)
  63     for i in range(0, len(cell) - 1):
  64         temp = cell[i + 1].translate(digits)
  65         temp = temp.replace(' ', '')
  66         x = dictionary.get(temp)
  67         if(x is None):
  68             print(
  69               "ERROR: The signal : " +
  70               str(cell[i + 1]) +
  71               " of pinmap.txt isn't present in the current dictionary.\
  72               \nUpdate dictionary or fix-typo.")
  73             exit(1)
  74         if(x == "input"):
  75             pinmux = pinmux + \
  76               mux_wire.format(cell[0], i, "wr" + cell[i + 1]) + "\n"
  77         elif(x == "inout"):
  78             pinmux = pinmux + \
  79                 mux_wire.format(cell[0], i, "wr" + cell[i + 1] +
  80                                             "_in") + "\n"
  81 # ============================================================ #
  82
  83 # ==================  Logic for dedicated pins ========= #
  84 for cell in dedicated_cells:
  85     pinmux = pinmux + "      cell" + \
  86         str(cell[0]) + "_out=" + cell[1] + "_io;\n"
  87     temp = cell[1].translate(digits)
  88     x = dictionary.get(temp)
  89     if(x == "input"):
  90         pinmux = pinmux + \
  91             dedicated_wire.format(cell[0], "wr" + cell[1]) + "\n"
  92     elif(x == "inout"):
  93         pinmux = pinmux + \
  94             dedicated_wire.format(cell[0], "wr" + cell[1] + "_in") + "\n"
  95 # =======================================================#