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