PiFace connection

This is what I have in the spi.py file

/usr/lib/python3/dist-packages/pifacecommon/spi.py

    
# create the spi transfer struct
    
transfer = spi_ioc_transfer(
        
tx_buf=ctypes.addressof(wbuffer),
        
rx_buf=ctypes.addressof(rbuffer),
        
len=ctypes.sizeof(wbuffer),
        
speed_hz=ctypes.c_uint32(100000)
    
)

Updates, Thanks Jon for the code modification. Now the display power ups and working but there is a little hiccup. Where it can't display free memory on the display. The tracebacks are :

Traceback (most recent call last):

  File "sysinfo.py", line 75, in <module>

    show_sysinfo()

  File "sysinfo.py", line 56, in show_sysinfo

    cad.lcd.write(":{}".format(get_my_free_mem()))

  File "sysinfo.py", line 35, in get_my_free_mem

    used_mem = float(run_cmd(USED_MEM_CMD))

ValueError: could not convert string to float:

cclegends  wrote:

 

Updates, Thanks Jon for the code modification. Now the display power ups and working but there is a little hiccup. Where it can't display free memory on the display. The tracebacks are :

 

Traceback (most recent call last):

  File "sysinfo.py", line 75, in <module>

    show_sysinfo()

  File "sysinfo.py", line 56, in show_sysinfo

    cad.lcd.write(":{}".format(get_my_free_mem()))

  File "sysinfo.py", line 35, in get_my_free_mem

    used_mem = float(run_cmd(USED_MEM_CMD))

ValueError: could not convert string to float:

Is this working now?

I inadvertently updated my config and ran into this issue as well.  I found the solution at the following:

https://github.com/piface/pifacecad/issues/27

This is what I have in my sysinfo.py file

#USED_MEM_CMD = "free | grep '\-\/+' | awk '{print $3}'"
USED_MEM_CMD = "free | grep 'Mem' | awk '{print $3}'"

This is actually running on an older Pi B+ but I am still having an issue on a Pi 3 B+ with the sp.py entry.

cclegends  wrote:

 

Updates, Thanks Jon for the code modification. Now the display power ups and working but there is a little hiccup. Where it can't display free memory on the display. The tracebacks are :

 

Traceback (most recent call last):

  File "sysinfo.py", line 75, in <module>

    show_sysinfo()

  File "sysinfo.py", line 56, in show_sysinfo

    cad.lcd.write(":{}".format(get_my_free_mem()))

  File "sysinfo.py", line 35, in get_my_free_mem

    used_mem = float(run_cmd(USED_MEM_CMD))

ValueError: could not convert string to float:

Is this working now?

I inadvertently updated my config and ran into this issue as well.  I found the solution at the following:

https://github.com/piface/pifacecad/issues/27

This is what I have in my sysinfo.py file

#USED_MEM_CMD = "free | grep '\-\/+' | awk '{print $3}'"
USED_MEM_CMD = "free | grep 'Mem' | awk '{print $3}'"

This is actually running on an older Pi B+ but I am still having an issue on a Pi 3 B+ with the sp.py entry.

On my Pi 3 B+ I ended up having to download the pifaceacad code from their github repo and run the setup install from that to get it to work.  Just running from apt-get loaded some older code that did not like the spi.py entry.

This is what I had seen prior to loaded the code from the github repo.

python3 /usr/share/doc/python3-pifacecad/examples/sysinfo.py
Traceback (most recent call last):
  File "/usr/share/doc/python3-pifacecad/examples/sysinfo.py", line 61, in <module>
    cad = pifacecad.PiFaceCAD()
  File "/usr/lib/python3/dist-packages/pifacecad/core.py", line 50, in __init__
    self.init_board()
  File "/usr/lib/python3/dist-packages/pifacecad/core.py", line 75, in init_board
    self.iocon.value = ioconfig
  File "/usr/lib/python3/dist-packages/pifacecommon/mcp23s17.py", line 238, in value
    self.chip.write(v, self.address)
  File "/usr/lib/python3/dist-packages/pifacecommon/mcp23s17.py", line 163, in write
    self._pyver_write(data, address)
  File "/usr/lib/python3/dist-packages/pifacecommon/mcp23s17.py", line 167, in _py3write
    self.spisend(bytes((ctrl_byte, address, data)))
  File "/usr/lib/python3/dist-packages/pifacecommon/spi.py", line 69, in spisend
    speed_hz=ctypes.c_uint32(self.speed_hz)
AttributeError: 'PiFaceCAD' object has no attribute 'speed_hz'

It is working now on both a RasPi B+ and a RasPi 3 B+.

Hi Jon, sorry for late updates. Thanks for the code, the screen is able to display and show the available memory.

jomoenginer  wrote:

 

cclegends   wrote:

 

Updates, Thanks Jon for the code modification. Now the display power ups and working but there is a little hiccup. Where it can't display free memory on the display. The tracebacks are :

 

Traceback (most recent call last):

  File "sysinfo.py", line 75, in <module>

    show_sysinfo()

  File "sysinfo.py", line 56, in show_sysinfo

    cad.lcd.write(":{}".format(get_my_free_mem()))

  File "sysinfo.py", line 35, in get_my_free_mem

    used_mem = float(run_cmd(USED_MEM_CMD))

ValueError: could not convert string to float:

Is this working now?

 

I inadvertently updated my config and ran into this issue as well.  I found the solution at the following:

https://github.com/piface/pifacecad/issues/27 

 

This is what I have in my sysinfo.py file

#USED_MEM_CMD = "free | grep '\-\/+' | awk '{print $3}'"
USED_MEM_CMD = "free | grep 'Mem' | awk '{print $3}'"

 

This is actually running on an older Pi B+ but I am still having an issue on a Pi 3 B+ with the sp.py entry.