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Python_Project---PYCPLDIntroductionAuto_Generate.pyips.generatormap_iolook_up_iplook_upparser_pin_in_outlook_up_table

Introduction

Github 上有一个开源的项目PYCPLD. 它的功能是用python脚本语言来集成CPLD的工程。

This project is to use the python script to integrate different CPLD IP into target board system. Currently the Altera MAX-II EP570P is supported with Quartus-15.1 version. and the Arduio compatible CPLD board is added in reference design.

你只需要按照它的模板来添加你的IP模块，其他的集成IP模块进系统和生成对应的Quartus工程就可以通过执行python脚本自动生成。

本文主要就是对其代码进行解析，阐述其实现原理。

你可以到github上搜索源码进行学习。有任何疑问，可以在评论中留言，我会尽快解答。

Auto_Generate.py

判断输入命令，如果为python ./Auto_Generate.py twrkv58f220m_SDK_2_0_enc.yml 格式 且 指定的yml文件存在，就执行g.generate(boardyml)来生成文件。

g = ips.generator，所以我们重点看ips.generator.

'''import语句作用就是用来导入模块的，它可以出现在程序中的任何位置。
在用import语句导入模块时最好按照这样的顺序：
1、python 标准库模块
2、python 第三方模块
3、自定义模块'''
import sys, os
import ips.generator

__PATH__ = os.path.dirname(os.path.abspath(__file__)).replace('\\','/')

if __name__ == '__main__':
    print (" Verilog Code Generator Tool")
    print (" -----------------------------------\n")

    g = ips.generator

    if len(sys.argv)== :
        boardyml = raw_input("Please input yaml file path\n>>")
    else:
        boardyml = sys.argv[]

    if os.path.exists(boardyml) is True:
        g.generate(boardyml)
    else:
        print ("error path: %s"%boardyml)
    sys.stdout.flush()
    os.system("pause")

ips.generator

ips.generator就是ips文件夹下的generator模块。

def generate(boardyml):
  ## context data
  context = {
#    'MODULE_TEXT': 'module top(clk,rst_n,rs232_rx,rs232_tx, %s, led);',
    'MODULE_TEXT': 'module top(clk,rst_n,rs232_rx, %s, led);',
    'INOUT_TEXT': '',
    'WIRE_TEXT': '',
    'REG_TEXT': '',
    'ASSIGN_TEXT': '',
    'IP_TEXT': '',
    'INIT_REG_TEXT': '',
    'CMD_CASE_TEXT': '',
    'RST_REG_TEXT': '',
    'DFT_REG_TEXT': ''
  }

  ret = analysis_yml(boardyml, context)

  if ret is None:
    return None
  ## render template with context data
  print "rend data*******************"
  topv = engine.render(VERILOG_TEMPLATE_PATH, context)

  save_template_to_file(VERILOG_OUTPUT_PATH, 'top', topv)
  print VERILOG_OUTPUT_PATH

ret = analysis_yml(boardyml, context)

分析yml

#analyze the boardyml and update the context for tempale
def analysis_yml(boardyml, context):
  io_dic, bus_scope = analysis.analysis_context(boardyml)
  print "io_dic"
  print io_dic
  print "bus_scope"
  print bus_scope
  if io_dic is None:
    return None
  IO_DIC = io_dic
  INIT_REG_TEXT, CMD_CASE_TEXT, RST_REG_TEXT, DFT_REG_TEXT = cpld.Code_verilog_reg(io_dic)  
  context['INIT_REG_TEXT'] = as_escaped(INIT_REG_TEXT)
  context['CMD_CASE_TEXT'] = as_escaped(CMD_CASE_TEXT)
  context['RST_REG_TEXT'] = as_escaped(RST_REG_TEXT)
  context['DFT_REG_TEXT'] = as_escaped(DFT_REG_TEXT)
  MODULE_TEXT = cpld.Module_header(bus_scope)
  context['MODULE_TEXT'] = as_escaped(MODULE_TEXT)
  INOUT_TEXT = cpld.inout(bus_scope)
  context['INOUT_TEXT'] = as_escaped(INOUT_TEXT)
  WIRE_TEXT = cpld.wire(io_dic)
  context['WIRE_TEXT'] = as_escaped(WIRE_TEXT)
  REG_TEXT = cpld.reg(io_dic)
  context['REG_TEXT'] = as_escaped(REG_TEXT)
  ASSIGN_TEXT = cpld.assign(io_dic, bus_scope)
  context['ASSIGN_TEXT'] = ASSIGN_TEXT
  IP_TEXT = cpld.ip_caller(io_dic)
  context['IP_TEXT'] = IP_TEXT
  return True

io_dic, bus_scope = analysis.analysis_context(boardyml)

调用analysis模块中的analysis_context函数。返回的是一个IO口的词典和bus_scope神马东东的。

##################################################################
#AUTO-GENERATE-API
##################################################################
def analysis_context(boardyml):
  global CPLD_IO_TABLE
  global BOARD_CPLD_IO_PATH
  global CPLD_QSF_TEMPL_PATH
  global CPLD_TCL_TEMPL_PATH

  file_name = os.path.basename(boardyml)
  dir_name  = os.path.dirname(boardyml)
  ##########################################################################
  #Choose cpld. According cpld versio and type, load cpld io and template path
  ##########################################################################
  #TYPE: TWR CPLD
  if  re.search("twr", file_name):
    #TWR CPLD V2
    if re.search("v2", dir_name):
      cpld_io_path  = BOARD_CPLD_IO_PATH['TWR_CPLD_V2']
      CPLD_QSF_TEMPL_PATH = BOARD_CPLD_QSF_TEMPLATE['TWR_CPLD_V2']
      CPLD_TCL_TEMPL_PATH = BOARD_CPLD_TCL_TEMPLATE['TWR_CPLD_V2']
    #TWR CPLD V1
    else:
      cpld_io_path  = BOARD_CPLD_IO_PATH['TWR_CPLD_V1']
      CPLD_QSF_TEMPL_PATH = BOARD_CPLD_QSF_TEMPLATE['TWR_CPLD_V1']
      CPLD_TCL_TEMPL_PATH = BOARD_CPLD_TCL_TEMPLATE['TWR_CPLD_V1']

  #TYPE: FRDM CPLD
  elif re.search("frdm", file_name):
    #FRDM CPLD V2
    if re.search("v2", dir_name):
      cpld_io_path  = BOARD_CPLD_IO_PATH['FRDM_CPLD_V2']
      CPLD_QSF_TEMPL_PATH = BOARD_CPLD_QSF_TEMPLATE['FRDM_CPLD_V2']
      CPLD_TCL_TEMPL_PATH = BOARD_CPLD_TCL_TEMPLATE['FRDM_CPLD_V2']


    #FRDM CPLD V1
    else:
      cpld_io_path  = BOARD_CPLD_IO_PATH['FRDM_CPLD_V1']
      CPLD_QSF_TEMPL_PATH = BOARD_CPLD_QSF_TEMPLATE['FRDM_CPLD_V1']
      CPLD_TCL_TEMPL_PATH = BOARD_CPLD_TCL_TEMPLATE['FRDM_CPLD_V1']

  #TYPE: CPLD EP570
  elif re.search("ep570", dir_name):
    cpld_io_path  = BOARD_CPLD_IO_PATH['EP570_CPLD']
    CPLD_QSF_TEMPL_PATH = BOARD_CPLD_QSF_TEMPLATE['EP570_CPLD']
    CPLD_TCL_TEMPL_PATH = BOARD_CPLD_TCL_TEMPLATE['EP570_CPLD']


  else:
    print "Error: Unknown CPLD Version!"
    return

  #load yml files
  modules = file_load_yml( boardyml )
  CPLD_IO_TABLE = file_load_yml( cpld_io_path )

  if modules is None or CPLD_IO_TABLE is None:
    print ("Error: Load file error.")
    return None

  #map cpld pins with boards(target & assitant), return a dic
  io_dic = map_io(modules)
  print io_dic
  if io_dic is None:
    return None, None


  bus_scope, Used_io = cpld_io_analyze(io_dic)

  if Used_io is None:
    print ("Error: Bus Definition!")
    return None, None

  #Generate  my_uart_top.v
  #---------------------------------------------
  #---------------------------------------------
  return io_dic, bus_scope
  #generate_top_v_file(internal_io_dic, external_io_dic, bus_scope)

加载cpld_io和qsf、 tcl文件的文件路径

通过os.path.basename和os.path.dirname得到boardyml的完整路径和文件名。

通过re.search(“twr”, file_name)和re.search(“v2”, dir_name)正则匹配，选择对应的CPLD板。根据CPLD板的版本来加载对应cpld_io文件路径和quartus工程所需的qsf tcl文件的文件路径

tcl文件：​tcl的全称是Tool command

language，是基于字符串的命令语言，tcl语言是一种解释性语言，他不需要通过编译与联结，它像其它shell语言一样，直接对每条语句顺次解释执行。在FPGA的应用中tcl文件中使用tcl语言对管脚进行配置，tcl文件只包含管脚的配置信息。

​ qsf文件：qsf的全称是Quartus Settings

File的缩写。包含了一个Quartus工程的所有约束，包括工程信息、器件信息、引脚约束、编译约束和用于Classic

TimingAnalyzer的时序约束。

（Quartus Settings File 都在pycpld/ips/template目录下）。

modules = file_load_yml( boardyml )

打开boardyml文件，用yaml.load进行加载。

yaml.load的作用是把一个yaml格式的文档转换成python对象。

##################################################################
#FILE OPERATIONS SECTION
##################################################################

def file_load_yml(fp):
  try:
    f = open(fp,"r")
  except IOError:
    print ("Error: No such file %s"%fp)
    return None

  c = {}
  try:
    c = yaml.load(f)
  except yaml.parser.ParserError:
    print ("Error: There may be some format errors exist in Yaml File.\n%s"%fp)
    return None

  f.close()
  return c

下面是节选的一个twrkv58f220m_SDK_2_0_test.yml文件：

#Descriptions:
#CMD: cpld command
#A: Assitant Board
#T: Target Board
#FUNC0: the function of this pin connection
#DIRECTION: A2T  T2A  T2T

#SINGLE: default 0, if the pin header is single on FRDM-Board, this should be set 1
SINGLE: 

PMH:
    CMD: PMH
    SW2:
        T_PIN: CPLD_IO4
        A_PIN: B58
        DIRECTION: A2T
        NOTE: SW2- fly wire to J8-


ENC:
    IP: __ENC
    CMD: ENC
    pha_out:
        PIN: A34
        DIRECTION: out
    phb_out:
        PIN: A33
        DIRECTION: out
    index_out:
        PIN: CPLD_IO50
        DIRECTION: out

主要有两种情况：

第一种就是简单的连线

第二种就是ip模块的输出输入配置（ENC正交编码模块）

生成的dict的结构如下:

<cmd>: [(ioin0,inout0,comments),...(ioin,ioout,comments), <module_name>]

  Struct io_dic:
  {
    <moudle_cmd_0>: [(ioin0,inout0,comments),...(ioin,ioout,comments), module_name],
    <moudle_cmd_1>: [(ioin0,inout0,comments),...(ioin,ioout,comments), module_name],
    <moudle_cmd_2>: [(ioin0,inout0,comments),...(ioin,ioout,comments), module_name],
    ...
  }

CPLD_IO_TABLE = file_load_yml( cpld_io_path )

读取cpld_io这个IO管脚信息的yml文件，同样，返回的是关于CPLD_IO信息的一个词典。

下面是节选的一个cpld_io.xxx.yml文件：

:
    TYPE: NONE
    FUNC: L4
    PINS: CPLD_IO1
    #used by L4 with J7 -
:
    TYPE: NONE
    FUNC: NONE
    PINS: CPLD_IO2
:
    TYPE: A
    FUNC: SPI1_CLK_K70
    PINS: B7_K70
# 22:   //这些是cpld的TDI TDO TCK TMS这些下载或者电源 GND的IO
#     TYPE: NONE
#     FUNC: NONE
#     PINS: X
# 23:
#     TYPE: NONE
#     FUNC: NONE
#     PINS: X
# 24:
#     TYPE: NONE
#     FUNC: NONE
#     PINS: X
# 25:
#     TYPE: NONE
#     FUNC: NONE
#     PINS: X
:
    TYPE: T
    FUNC: NONE
    PINS: B7

上面是twrv2_cpld_io.yml中的一段。

TYPE有三种定义：

  1. NONE 代表这个IO口连到板子的jumper上，没有连到ELEV板子上，也不作特定的连接辅助板K70的IO。
  2. A代表代表这个IO口连到板子的jumper上，作特定连接辅助板K70的IO。
  3. T是Target Board的意思，这些cpld的io口都连到了ELEV板子上

注意CPLD_IO_TABLE是一个全局变量

io_dic = map_io(modules)

通过前面的modules（这个由用户定义的IO连线的yml文件生成得到的dict）匹配（定义好的CPLD板子的IO端口说明生成得到的dict），得到匹配好的IO端口连线的dict：io_dic

因为CPLD_IO_TABLE是一个全局变量，所以这里map_io只带了modules这个参数。

map_io—>look_up—>parser_pin_in_out—>look_up_table—>global CPLD_IO_TABLE

下面是重点，目录升级到最高.

map_io 

def map_io(modules):
  '''
  <cmd>: [(ioin0,inout0,comments),...(ioin,ioout,comments), <module_name>]

  Struct io_dic:
  {
    <moudle_cmd_0>: [(ioin0,inout0,comments),...(ioin,ioout,comments), module_name],
    <moudle_cmd_1>: [(ioin0,inout0,comments),...(ioin,ioout,comments), module_name],
    <moudle_cmd_2>: [(ioin0,inout0,comments),...(ioin,ioout,comments), module_name],
    ...
  }

  '''
  SingF  = 
  switch = False

  try:
    SingF = modules["SINGLE"]
    del modules["SINGLE"]
  except KeyError:
    pass

  if SingF == : switch = True

  io_dic = {}

  #look up io in cpld for each module
  for module_name in modules:
    module = modules[module_name]
    CMD = module["CMD"]

    if ( "IP" in module):
      io_dic[CMD] = look_up_ip(module, switch)
      if io_dic[CMD] is None:
        print ("Error: Pin error, Please check your yml file at module: \'%s\'."%module_name)
        return None
      io_dic[CMD].append(module_name)
    else:
      io_dic[CMD] = look_up(module, switch)
      if io_dic[CMD] is None:
        print ("Error: Pin error, Please check your yml file at module: \'%s\'."%module_name)
        return None
      io_dic[CMD].append(module_name)
  build_in_module = {'IP': '__UART', 'CMD': 'BIM'}
  io_dic['UART'] = look_up_ip(build_in_module, switch)
  return io_dic

入口参数modules是如下的词典

{'ENC': {'phb_out': {'DIRECTION': 'out', 'PIN': 'A33'}, 'IP': '__ENC', 'CMD': 'ENC', 'pha_out': {'DIRECTION': 'out', 'PIN': 'A34'}, 'index_out': {'DIRECTION': 'out', 'PIN': 'CPLD_IO50'}}, 'PMH': {'CMD': 'PMH', 'SW2': {'NOTE': 'SW2-1 fly wire to J8-1', 'DIRECTION': 'A2T', 'A_PIN': 'B58', 'T_PIN': 'CPLD_IO4'}}}
           
for module_name in modules:
    module = modules[module_name]
    CMD = module["CMD"]
           
dict = {"b":"2", "a":"1",
        "c":"3", "e":"5", "d":"4"}

for key,value in dict.items():
    print(key,value)

# -- OUTPUT --
# a 1
# c 3
# b 2
# e 5
# d 4
'''
输出的顺序却不是我们预想的那样初始化的顺序，查询相关文献得知，Python保证遍历字典所有元素，但不保证遍历的顺序，
'''

module就是

{'phb_out': {'DIRECTION': 'out', 'PIN': 'A33'}, 'IP': '__ENC', 'CMD': 'ENC', 'pha_out': {'DIRECTION': 'out', 'PIN': 'A34'}, 'index_out': {'DIRECTION': 'out', 'PIN': 'CPLD_IO50'}}

CMD得到的就是‘ENC’

如果是内建IP模块，调用look_up_ip(module, switch)

如果是连线，调用look_up(module, switch)

上面两步生成的io_dic中添加UART这个默认模块（每一个工程都需要一个UART的IP用来接收CMD） 

build_in_module = {'IP': '__UART', 'CMD': 'BIM'}
  io_dic['UART'] = look_up_ip(build_in_module, switch)

look_up_ip

{‘phb_out’: {‘DIRECTION’: ‘out’, ‘PIN’: ‘A33’}, ‘IP’: ‘__ENC’, ‘CMD’: ‘ENC’, ‘pha_out’: {‘DIRECTION’: ‘out’, ‘PIN’: ‘A34’}, ‘index_out’: {‘DIRECTION’: ‘out’, ‘PIN’: ‘CPLD_IO50’}}

#look up io in cpld_io dic for internal IPs
#return:  [(CpldIOIn0,CpldIoOut0,Comments),....]    type[list]
#switch: single row need to remap, this value set True
def look_up_ip(module, switch):
  global IP_DICT
  mname = module["CMD"]
  print "module name: " + mname
  #Python 字典(Dictionary) keys() 函数以列表list返回一个字典dict所有的键key。
  confuncs = module.keys()
  #remove() 函数用于移除列表中某个值的第一个匹配项。
  confuncs.remove("CMD")

  #search the IP package and find the matching IPs

'''
pkgutil.iter_modules(path=None, prefix='')
Yields (module_finder, name, ispkg) for all submodules on path, or, if path is None, all top-level modules on sys.path.

path should be either None or a list of paths to look for modules in.

prefix is a string to output on the front of every module name on output.
'''
  pkgpath = os.path.dirname(ip.__file__)
  cips = [name for _, name, _ in pkgutil.iter_modules([pkgpath])]

'''

['base_ip', 'enc', 'i2c_master', 'i2c_slave', 'i2c_slave_for_case', 'pwm_capture', 'pwm_out', 'qdec', 'spi_master', 'spi_slave', 'spi_slave_new', 'sw_pulse', 'uart', 'uart7bit', 'uart8bit']

'''
  ip_name = None
  for cip in cips:
    print "checking " + cip
    #print_classes()
    #func = getattr(ip, cip + '.get_ip_name')
    sub_module = getattr(ip, cip)
    #<module 'ips.ip.enc' from 'C:\mcu_cpld_prd\mcu_cpld_prd\Auto_Generator\pycpld\ips\ip\enc\__init__.pyc'>

    func = getattr(sub_module, 'get_ip_name')
    #<function get_ip_name at 0x02B437F0>

    sub_module_class = getattr(sub_module, func())
    #ips.ip.enc.enc_partial.ENC


    sub_module_class_instance = sub_module_class("")
    #<ips.ip.enc.enc_partial.ENC instance at 0x02BA0850>

    if sub_module_class_instance.matched_id(module['IP']) is True:
      print "ID matched for " + module['IP']
      ip_name = sub_module_class_instance.__class__.__name__
      if sub_module_class_instance.__class__.__name__ not in IP_DICT['class']:
        IP_DICT['inst'].append(sub_module_class_instance)
        IP_DICT['class'].append(sub_module_class_instance.__class__.__name__)
        if "ALT" in module:
          print "*****************************"
          print "set inst alt %s"%(module["ALT"])
          sub_module_class_instance.set_alt(module["ALT"])
          sub_module_class_instance.ALT_CMD = mname
      elif "ALT" in module:
        print "*****************************"
        print "set inst alt %s"%(module["ALT"])
        IP_DICT['inst'].append(sub_module_class_instance)
        IP_DICT['class'].append(sub_module_class_instance.__class__.__name__)
        sub_module_class_instance.set_alt(module["ALT"])
        sub_module_class_instance.ALT_CMD = mname
      break

  if ip_name is None:
    print "No matching IP found for " + module['IP']
    return None
  confuncs.remove("IP")
  if "ALT" in confuncs:
    confuncs.remove("ALT")
  confuncs.sort()

  look_result = []

  if mname == "BIM":
    look_result.append(('','',"//build in %s"%module['IP'], 'BIM', ip_name))
    return look_result

  for conname in confuncs:
    connection = module[conname]
    CPinIN, CPinOUT, comments, ip_ping_wire = parser_pin_ip(connection, conname)

    if CPinIN is not None or CPinOUT is not None:
      look_result.append((CPinIN,CPinOUT,comments, ip_ping_wire, ip_name))
    else:
      return None

  return look_result

look_up 

#look up io in cpld_io dic
#return:  [(CpldIOIn0,CpldIoOut0,Comments),....]    type[list]
#switch: single row need to remap, this value set True
def look_up(module, switch):
  mname = module["CMD"]

  confuncs = module.keys()
  confuncs.remove("CMD")
  confuncs.sort()

  look_result = []

  for conname in confuncs:
    connection = module[conname]
    CPinIN, CPinOUT, comments = parser_pin_in_out(connection, switch)

    if CPinIN is not None and CPinOUT is not None:
      look_result.append((CPinIN,CPinOUT,comments))
    else:
      return None

  return look_result

parser_pin_in_out

look_up_table

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