ValueError: not enough values to unpack (expected 3, got 0)

[Papadoma]

ESP32 1.0.4
Latest ulptool

I've fixed some errors on the recipe.py, mostly to do with casting bytes to strings

Now I get
`python C:\Users\Papadoma\AppData\Local\Arduino15\packages\esp32\tools\ulptool\src/esp32ulp_mapgen.py -s ulp_main.sym -o ulp_main
Traceback (most recent call last):

File "C:\Users\Papadoma\AppData\Local\Arduino15\packages\esp32\tools\ulptool\src/esp32ulp_mapgen.py", line 54, in

exit(main())

File "C:\Users\Papadoma\AppData\Local\Arduino15\packages\esp32\tools\ulptool\src/esp32ulp_mapgen.py", line 49, in main

gen_ld_h_from_sym(f_sym, f_ld, f_h)

File "C:\Users\Papadoma\AppData\Local\Arduino15\packages\esp32\tools\ulptool\src/esp32ulp_mapgen.py", line 22, in gen_ld_h_from_sym

name, _, addr_str = line.split()

ValueError: not enough values to unpack (expected 3, got 0)`

[duff2013]

Can you give me link to your fixes?

[Papadoma]

I haven't worked on it for a while
I will give it another look this week and come back to you

[JosueAsturias]

i have this problem in windows 10, how can it be solved?

[JosueAsturias]

Traceback (most recent call last):l\Arduino15\packages\esp32\tools\ulptool\src/esp32ulp_mapgen.py -s ulp_main.sym -o ulp_main
File "C:\Users\jotas\AppData\Local\Arduino15\packages\esp32\tools\ulptool\src/esp32ulp_mapgen.py", line 54, in
exit(main())
File "C:\Users\jotas\AppData\Local\Arduino15\packages\esp32\tools\ulptool\src/esp32ulp_mapgen.py", line 49, in main
gen_ld_h_from_sym(f_sym, f_ld, f_h)
File "C:\Users\jotas\AppData\Local\Arduino15\packages\esp32\tools\ulptool\src/esp32ulp_mapgen.py", line 22, in gen_ld_h_from_sym
name, _, addr_str = line.split()
ValueError: not enough values to unpack (expected 3, got 0)

exit status 1
Error compiling for board ESP32 Dev Module.

[rheingoldheavy]

Here in Sept-2022 this problem also occurred for me when attempting to build any of the example code I've found.

Environment:

• Windows 10
• Arduino IDE 1.8.13
• Python 3.9-64 (default)
• Python 3.88-32
• Python 2.7-64
• ulptool v2.4.2

The steps I took to get here (not sure of the order)...

1. Full ulptool installation procedure followed to the letter
2. Added # python -2 to the top of both esp32ulp_build_recipe.py and esp32ulp_mapgen.py, to force the use of Python v2.x
3. Fix "TypeError: can only concatenate str" issue using this post: Issue #62
4. Fix "undefined reference" due to not copying .s files: 60d0f7d

At that point I was left with the "ValueError: not enough values to unpack" issue. I tracked that down to the generation of the symbol "ulp_main.sym" file performed in esp32ulp_build_recipe.py using nm resulting in extra empty lines. When esp32ulp_mapgen.py attempts to parse the line and split it using space as a delimiter, it doesn't know what to do with the empty lines and errors out.

I hacked together a fix for esp32ulp_build_recipe.py using this StackOverflow post as guidance.

Original Code

    ## Generate list of global symbols
    cmd = gen_binutils_nm_cmd(PATHS)
    proc = subprocess.Popen(cmd[1],stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=False)
    (out, err) = proc.communicate()
    if err:
        error_string = cmd[0] + '\r' + err
        sys.exit(error_string)
    else:
        file_names_constant = gen_file_names_constant()
        with open(file_names_constant['sym'],"w") as fsym:
            fsym.write(out.decode('utf-8'))
        console_string += cmd[0] + '\r'

Revised Code

    ## Generate list of global symbols
    cmd = gen_binutils_nm_cmd(PATHS)
    proc = subprocess.Popen(cmd[1],stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=False)
    (out, err) = proc.communicate()
    if err:
        error_string = cmd[0] + '\r' + err.decode('utf-8')
        sys.exit(error_string)
    else:
        file_names_constant = gen_file_names_constant()

        with open(file_names_constant['sym'],"w") as fsym:
            fsym.write(out.decode('utf-8'))

        with open(file_names_constant['sym']) as filehandle:
            lines = filehandle.readlines()

        with open(file_names_constant['sym'], 'w') as filehandle:
            lines = filter(lambda x: x.strip(), lines)
            filehandle.writelines(lines)   

        console_string += cmd[0] + '\r'

I've successfully compiled and run the readme example, and compiled a handful of the other ulptool examples (haven't tried flashing them yet, but they compile).

Hopefully someone finds this helpful :)

(edited for formatting)