src/parse.py

   1 import math
   2 import os.path
   3
   4
   5 def missing_numbers(num_list):
   6     original_list = [x for x in range(num_list[0], num_list[-1] + 1)]
   7     num_list = set(num_list)
   8     return (list(num_list ^ set(original_list)))
   9
  10
  11 class Parse(object):
  12     # == Parameters == #
  13     N_MUX = 1           # number of selection lines for the mux per io
  14     N_IO = 0
  15     N_MUX_IO = 0
  16     Addressing = 'WORD'
  17     ADDR_WIDTH = 32  # TODO parameterise
  18     DATA_WIDTH = 64  # TODO parameterise
  19     # ================ #
  20
  21     # Generating the number of bits for memory map #
  22     lower_offset = 0
  23     if Addressing == 'BYTE':
  24         lower_offset = 0
  25     elif Addressing == 'HWORD':
  26         lower_offset = 1
  27     elif Addressing == 'WORD':
  28         lower_offset = 2
  29     elif Addressing == 'DWORD':
  30         lower_offset = 3
  31     else:
  32         print('ERROR: Addressing should be one of: BYTE, HWORD, WORD, DWORD')
  33         exit(1)
  34
  35     def __init__(self, pth=None, verify=True):
  36
  37         max_io = 0
  38         self.muxed_cells = []
  39         self.dedicated_cells = []
  40         self.pinnumbers = []
  41
  42         # == capture the number of IO cells required == #
  43         fname = 'pinmap.txt'
  44         if pth:
  45             fname = os.path.join(pth, fname)
  46         with open(fname) as pinmapfile:
  47             for lineno, line in enumerate(pinmapfile):
  48                 line1 = line[:-1].split('\t')
  49                 if len(line1) <= 1:
  50                     continue
  51                 self.pinnumbers.append(int(line1[0]))
  52                 if len(line1) == 2:  # dedicated
  53                     self.dedicated_cells.append(line1)
  54                 else:
  55                     for i in range(1, len(line1)):
  56                         # XXX HORRIBLE HACK!!
  57                         if line1[i].startswith('pwm'):
  58                             line1[i] = 'pwm%s_out' % line1[i][4:]
  59                     self.muxed_cells.append(line1)
  60
  61         self.pinnumbers = sorted(self.pinnumbers)
  62         self.upper_offset = self.lower_offset + \
  63             int(math.log(len(self.muxed_cells), 2))
  64
  65         if verify:
  66             self.do_checks()
  67
  68         self.cell_bitwidth = self.get_cell_bit_width()
  69
  70         # == user info after parsing ================= #
  71         self.N_IO = len(self.dedicated_cells) + len(self.muxed_cells)
  72         print("Max number of IO: " + str(self.N_IO))
  73         print("Muxer bit width: " + str(self.cell_bitwidth))
  74         print("Muxed IOs: " + str(len(self.muxed_cells)))
  75         print("Dedicated IOs: " + str(len(self.dedicated_cells)))
  76
  77     def do_checks(self):
  78         """ Multiple checks to see if the user has not screwed up
  79         """
  80         missing_pins = missing_numbers(self.pinnumbers)
  81
  82         # Check-1: ensure no pin is present in both muxed and dedicated pins
  83         for muxcell in self.muxed_cells:
  84             for dedcel in self.dedicated_cells:
  85                 if dedcel[1] in muxcell:
  86                     print("ERROR: " + str(dedcel[1]) + " present \
  87                                           in dedicated & muxed lists")
  88                     exit(1)
  89
  90         # Check-2: if pin numbering is consistent:
  91         if missing_pins:
  92             print("ERROR: Following pins have no assignment: " +
  93                   str(missing_numbers(self.pinnumbers)))
  94             exit(1)
  95         unique = set(self.pinnumbers)
  96         duplicate = False
  97         for each in unique:
  98             count = self.pinnumbers.count(each)
  99             if count > 1:
 100                 print("ERROR: Multiple assignment for pin: " + str(each))
 101                 duplicate = True
 102         if duplicate:
 103             exit(1)
 104
 105         # Check-3: confirm if N_* matches the instances in the pinmap
 106         # ============================================================== #
 107
 108         # TODO
 109
 110     def get_cell_bit_width(self):
 111         max_num_cells = 0
 112         for cell in self.muxed_cells:
 113             max_num_cells = max(len(cell) - 1, max_num_cells)
 114         return int(math.log(max_num_cells + 1, 2))
 115
 116
 117 if __name__ == '__main__':
 118     p = Parse()
 119     print (p.N_IO)