src/actual_pinmux.py

   1 from params import *
   2 from string import digits
   3
   4
   5 ## dictionary of properties of signals that are supported.
   6 dictionary={
   7         "uart_rx"       :"input",
   8         "uart_tx"       :"output",
   9         "spi_sclk"      :"output",
  10         "spi_mosi"      :"output",
  11         "spi_ss"                :"output",
  12         "spi_miso"      :"input"
  13 }
  14
  15
  16 ########### common bsv templates ############
  17 assign_cell='''cell{0}_out=wrmux{0}=={1}?'''
  18 # first argument is the io-cell number being assigned.
  19 # second argument is the mux value.
  20 # Third argument is the signal from the pinmap file
  21 input_wire='''
  22                 rule assign_input_for_{2}_on_cell{0}(wrmux{0}=={1});
  23                         wr{2}<=cell{0}_in;
  24                 endrule
  25 '''
  26 #########################################
  27 pinmux=''' '''
  28 pinmap_file=open("./pinmap.txt","r")
  29 for lineno,line in enumerate(pinmap_file):
  30         line1=line.split()
  31         if(lineno>0):
  32                 if(lineno>N_IO):
  33                         print"ERROR: Parameter N_IO("+str(N_IO)+") is less than the pin number in line: "+str(lineno)+" of pinmap.txt"
  34                         exit(1)
  35                 ######## Mux each generic IO cell with the mapping######
  36                 # provided in the pinmap file
  37                 pinmux=pinmux+"         cell"+str(line1[0])+"_out="
  38                 i=0
  39                 while(i<len(line1)-1):
  40                         pinmux=pinmux+"wrmux"+str(line1[0])+"=="+str(i)+"?"+line1[i+1]+"_io:"
  41                         if(i+2==len(line1)-1):
  42                                 pinmux=pinmux+line1[i+2]+"_io"
  43                                 i=i+2
  44                         else:
  45                                 i=i+1
  46                 pinmux=pinmux+";\n"
  47                 ########################################################
  48
  49                 ###### check each cell if "peripheral input/inout" then assign its wire ########
  50                 ## Here we check the direction of each signal in the dictionary.
  51                 ## We choose to keep the dictionary within the code and not user-input
  52                 ## since the interfaces are always standard and cannot change from user-to-user
  53                 ## plus reduces human-error as well :)
  54                 for i in range(0,len(line1)-1):
  55                         temp=line1[i+1].translate(None,digits)
  56                         x=dictionary.get(temp);
  57                         if(x==None):
  58                                 print "Error: The signal : "+str(line1[i+1])+" in lineno: "+str(lineno)+"of pinmap.txt is not present in the current dictionary.\nSoln: Either update the dictionary or fix typo."
  59                                 exit(1)
  60                         if(x=="input" or x=="inout"):
  61                                 pinmux=pinmux+input_wire.format(line1[0],i,line1[i+1])+"\n"
  62                 ################################################################################
  63 ###########################################
  64