[gnea/grbl Issue#422] External jog controller

#1 – swarfer 于 2018-04-25

send them to the GUI, then the GUI passes them along to GRBL

#2 – Jibeji 于 2018-04-25

I want to send them to GRBL, not to the GUI.

#3 – terjeio 于 2018-04-25

Similar to this?

Grbl Dro/Mpg

I am “listening in” to grbls real time reports in the second processor. To change to MPG-mode I have connected a switch to the grbl processor (will be momentray in final version). If grbl can switch to MPG mode (is in IDLE state) it adds MPG:1 to the real time report telling the second processor to take over the input stream to grbl. This can be done by a switch, however my implementation uses a secondary UART input. When switching back to normal mode I add MPG:0 to the real time report.

#4 – Jibeji 于 2018-04-25

Yes, very simalar to this, it’s brillant !
Is the switch switching the TX line to GRBL or are you connecting both UART in parallel ?

#5 – terjeio 于 2018-04-25

The second UART stream is input only, the primary always handles the output stream so that is connected in parallell to the PC and the MPG processor.

Since I am using function pointers for grbl access to the HAL (in my ARM port) I switch the input stream to the secondary UART by just swapping the relevant pointers, here is how I do it for TIs MSP432 processor for now:

“ c
static void modeSelect (bool mpg_mode)
{
BITBANDPERI(MODEPORT->IE, MODESWITCHPIN) = 0;
BITBANDPERI(MODEPORT->IES, MODESWITCHPIN) = !mpg_mode;
BITBANDPERI(MODEPORT->IFG, MODESWITCHPIN) = 0;
BITBANDPERI(MODEPORT->IE, MODESWITCHPIN) = 1;

// Deny entering MPG mode if busy
if(mpgmode == sys.mpgmode || (mpgmode && (gcstate.filerun || sys.state != STATEIDLE)))
return;

BITBANDPERI(MODEPORT->OUT, MODELEDPIN) = mpg_mode;

serialSelect(mpg_mode);

if(mpg_mode) {
serial2RxFlush();
hal.serial_read = serial2GetC;
hal.serialgetrxbufferavailable = serial2RxFree;
hal.serialresetread_buffer = serial2RxFlush;
hal.serialcancelread_buffer = serial2RxCancel;
} else {
serialRxFlush();
hal.serial_read = serialGetC;
hal.serialgetrxbufferavailable = serialRxFree;
hal.serialresetread_buffer = serialRxFlush;
hal.serialcancelread_buffer = serialRxCancel;
}

// Report WCO on first status report request from MPG processor
if(mpg_mode)
sys.reportwcocounter = 1;

// Force a realtime status report
hal.protocolprocessrealtime('?');

sys.mpgmode = mpgmode;
}
“
IMO the same can be achieved by using a physical switch on the UART RX signal.

#6 – chamnit 于 2018-04-25

External pendant support is on the to-do list for the next version.

#7 – Jibeji 于 2018-04-26

When will it be released ?
Just to know if I continue my own project in the meantime.

#8 – terjeio 于 2018-04-27

Have a look here and join in if you are interested…