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 dedicated=False
  32 for lineno,line in enumerate(pinmap_file):
  33         line1=line.split()
  34         if("muxed" in line):
  35                 dedicated=False
  36         elif("dedicated" in line):
  37                 dedicated=True
  38         ############################## Logic for muxed pins ##############################
  39         if(len(line1)>1 and not(dedicated)):
  40                 if(lineno>N_IO):
  41                         print("ERROR: Parameter N_IO("+str(N_IO)+") is less than the pin number in line: "+str(lineno)+" of pinmap.txt")
  42                         exit(1)
  43                 ######## Mux each generic IO cell with the mapping######
  44                 # provided in the pinmap file
  45                 pinmux=pinmux+"         cell"+str(line1[0])+"_out="
  46                 i=0
  47                 while(i<len(line1)-1):
  48                         pinmux=pinmux+"wrmux"+str(line1[0])+"=="+str(i)+"?"+line1[i+1]+"_io:"
  49                         if(i+2==len(line1)-1):
  50                                 pinmux=pinmux+line1[i+2]+"_io"
  51                                 i=i+2
  52                         else:
  53                                 i=i+1
  54                 pinmux=pinmux+";\n"
  55                 ########################################################
  56
  57                 ###### check each cell if "peripheral input/inout" then assign its wire ########
  58                 ## Here we check the direction of each signal in the dictionary.
  59                 ## We choose to keep the dictionary within the code and not user-input
  60                 ## since the interfaces are always standard and cannot change from user-to-user.
  61                 ## Plus this also reduces human-error as well :)
  62                 for i in range(0,len(line1)-1):
  63                         digits = str.maketrans(dict.fromkeys('0123456789'))
  64                         temp=line1[i+1].translate(digits)
  65                         x=dictionary.get(temp);
  66                         if(x==None):
  67                                 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.")
  68                                 exit(1)
  69                         if(x=="input"):
  70                                 pinmux=pinmux+input_wire.format(line1[0],i,"wr"+line1[i+1])+"\n"
  71                         elif(x=="inout"):
  72                                 pinmux=pinmux+input_wire.format(line1[0],i,"wr"+line1[i+1]+"_in")+"\n"
  73                 ################################################################################
  74
  75         ############################## Logic for dedicated pins ##############################
  76         elif(len(line1)>1 and dedicated):
  77                 pinmux=pinmux+"         cell"+str(line1[0])+"_out="+line1[1]+"_io;\n"
  78 ###########################################
  79