For this week I work in the serial bus asynchronous.
For do the PCB boards I use the png files (bridge and node x 2) availabele in the week Networking and Communications.

The Neil´s serial bus asynchronous example use three boards:

• Bridge (x 1): Board / Traces
• Nodes (x 2) Board / Traces

For program the boards I use the Arduino as a ISP. This is simple to program with Arduino IDE. the following images show the basic configuration:

With the Arduino running as a ISP and the boards ready, I load separately , in each board (node 1, node 2 and bridge), the blink´s Arduino examplae using Arduino IDE, with the purpose of test the Arduino as a ISP and the boards, and it looking good...

The diagram of connections between the Arduino as a ISP and the boards looks like that:

Once the Arduino is ready to work as a ISP, I began with the process for load the serial bus asynchronous program ( hello.bus.45.c and makefile) in the microchips of the boards: bridge x 1 and nodes x 2...

The software support for flash chip using c file and makefile (I install these files):

• WinAVR
• MinGW: C compiler

Then, I open a new directory and add the Makefile and hello.bus.45.c and:

• hello.bus.45.c
  • In the C code change (in the line 41) 0 for the bride, 1 for the node 1 and 2 for the node 2. Each C code works separately with his respective makefile, for that I create three directories, one for each table.
  
  
  

• Makefile:
  • I try to use the Makefile corresponding to the example, but I could not generate the necessary files, so I used another Makefile, the same one that needs to be prepared:
  • Rename the Makefile so that it is without any extension (here is a tutorial)
  • Activate in the code the microchip to be used (remove the comment "#") and chek that the indentation is with tabs not spaces.
    
    
    
    
  • Then, with de ISP and the board connected:
    
    In the command prompt: In the file´s directory, for generate the .hex files:

    make hex
    								    		

    Then, the features configuration of the avrdude for load the .hex files in the chip (in the command prompt to, in the file´s directory):

    avrdude -P com4 -c stk500v1 -b 19200 -p t45 -U flash:w:hello.bus.45.c.hex
    								    		

  • Program files
    

  Test the board:
  

  • First I install the FTDI firmware (here is a tutorial)
  • Then install PySerial: I cant install it in Windows 10, I dont know why, so I install it in Linux:
  • In the Python directory open the terminal:

  pip
  					

  pyserial
  					

  tkinter
  					

  sudo python term.py/dev/ttyusb0 9600