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         "twi_sda"       :"inout",
  14         "twi_scl"       :"inout"
  15 }
  16
  17
  18 ########### common bsv templates ############
  19 assign_cell='''cell{0}_out=wrmux{0}=={1}?'''
  20 # first argument is the io-cell number being assigned.
  21 # second argument is the mux value.
  22 # Third argument is the signal from the pinmap file
  23 input_wire='''
  24                 rule assign_{2}_on_cell{0}(wrmux{0}=={1});
  25                         {2}<=cell{0}_in;
  26                 endrule
  27 '''
  28 #########################################
  29 pinmux=''' '''
  30 pinmap_file=open("./pinmap.txt","r")
  31 for lineno,line in enumerate(pinmap_file):
  32         line1=line.split()
  33         if(lineno>0):
  34                 if(lineno>N_IO):
  35                         print("ERROR: Parameter N_IO("+str(N_IO)+") is less than the pin number in line: "+str(lineno)+" of pinmap.txt")
  36                         exit(1)
  37                 ######## Mux each generic IO cell with the mapping######
  38                 # provided in the pinmap file
  39                 pinmux=pinmux+"         cell"+str(line1[0])+"_out="
  40                 i=0
  41                 while(i<len(line1)-1):
  42                         pinmux=pinmux+"wrmux"+str(line1[0])+"=="+str(i)+"?"+line1[i+1]+"_io:"
  43                         if(i+2==len(line1)-1):
  44                                 pinmux=pinmux+line1[i+2]+"_io"
  45                                 i=i+2
  46                         else:
  47                                 i=i+1
  48                 pinmux=pinmux+";\n"
  49                 ########################################################
  50
  51                 ###### check each cell if "peripheral input/inout" then assign its wire ########
  52                 ## Here we check the direction of each signal in the dictionary.
  53                 ## We choose to keep the dictionary within the code and not user-input
  54                 ## since the interfaces are always standard and cannot change from user-to-user.
  55                 ## Plus this also reduces human-error as well :)
  56                 for i in range(0,len(line1)-1):
  57                         digits = str.maketrans(dict.fromkeys('0123456789'))
  58                         temp=line1[i+1].translate(digits)
  59                         x=dictionary.get(temp);
  60                         if(x==None):
  61                                 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.")
  62                                 exit(1)
  63                         if(x=="input"):
  64                                 print(line1[i+1]+" "+x)
  65                                 pinmux=pinmux+input_wire.format(line1[0],i,"wr"+line1[i+1])+"\n"
  66                         elif(x=="inout"):
  67                                 print(line1[i+1]+" "+x)
  68                                 pinmux=pinmux+input_wire.format(line1[0],i,"wr"+line1[i+1]+"_in")+"\n"
  69                 ################################################################################
  70 ###########################################
  71