This project has the goal to manipulate input and output pins of avr devices over serial interface,
allowing python scripts to set and get io states of the device.
it is possible to change io manually in realtime with a terminal input according to the protocol.
There are some functions to manipulate the PWM module. PWM controll gui uses these functions.
this allows for microstepping a bldc-motor.
TODO: problem is rather large minimum pulse width resulting from pin level calculation in isr
it consists of
- terminal class: handling the communication with the device for python scripts
- headerconverter: to be able to use familiar naming conventions in python
- filehandler: polling folders for input files
- avr firmware: serving the incoming requests
avrheaderconverter:
- place for header conversion
- drop the device specific header in the avr folder
you can find the appropriate header in io.h
in the line below #if defined (__YOUR_DEVICE__)
maybe a device class specific header is needed also, for example iocanxx.h
- run: h2py io.h
or
- call: h2py.convert(['avr/io.h'])
- this generates IO.py which can be imported in the terminal to
use it just like #include <avr/io.h> names
Notes:
sfr_defs.h is modified in some places to be convertable.
this conversion respects only io adresses so it is intended to skip interrupt
vectors and such things. (no program memory)
terminal:
- place for communication
remoAVR:
AVR class used for manipulating registers in the device over uart
Protocol:
All values and addresses are transmitted formated in hex (0x12af)
__instructions:_________________________
's' set value at address
send: s <addr> <val>\r
recv: s <addr> <val> [err_val]\n\r
'g' get value from address
send: g <addr>\r
recv: g <addr> <value>\n\r
'm' malloc
send: m <size>\r
recv: m <size> <addr>\n\r
'f' free memor
send: f <addr>\r
recv: f <addr>\n\r
'b' write binary stream of len
binary data is received without response
'a' setPWMBuffer defaults to sin LUT if no addr specified
send: a <addr>\r
recv: a <addr> <realaddr>\n\r
'p' setPhaseShift in number of sample offset in LUT buffer
send: p <phaseA> <phaseB> <phaseC>\r
recv: p <phaseA> <phaseB> <phaseC>\n\r
'o' setOutputPinsAddr
send: o <portAddr> <AHighPinNr> <ALowPinNr> <BHighPinNr> <BLowPinNr> <CHighPinNr> <CLowPinNr> \r
recv: o <portAddr> <AHighPinNr> <ALowPinNr> <BHighPinNr> <BLowPinNr> <CHighPinNr> <CLowPinNr> \n\r
'A' setAmplidudeAndSpeed
currently not usefull (amplification is only natural numbers (uint8) and speed not imlemented)
________________________________________
remoAVR does:
setup serial communication
issue instruction
parse return value
if IO.py is imported then all registers can be addressed through their usual names
filehandler:
only proof of concept atm
avr firmware:
based on Peter Fleury's uart.
waits for a instruction to be finalized with return
is build in avr studio 6
for atmega2560 uart0 (tested)
for atmega16 uart (tested)