I was trying to connect simulator to bCNC software, but bCNC started a loop because gbrl detects the "CYCLE START" machine button allways on. I suppose other software will have the same issue as well.

As a workaround, I've commented the lines related to the CYCLE_START button in system.c (grbl code). I guess there is a more elegant way to do it in grbl-sim, but I don know how.

diff --git a/grbl/system.c b/grbl/system.c
index 55e6c40..5b87702 100644
--- a/grbl/system.c
+++ b/grbl/system.c
@@ -51,7 +51,7 @@ uint8_t system_control_get_state()
       if (bit_istrue(pin,(1<<CONTROL_FEED_HOLD_BIT))) { control_state |= CONTROL_PIN_INDEX_FEED_HOLD; }
     #endif
     if (bit_istrue(pin,(1<<CONTROL_RESET_BIT))) { control_state |= CONTROL_PIN_INDEX_RESET; }
-    if (bit_istrue(pin,(1<<CONTROL_CYCLE_START_BIT))) { control_state |= CONTROL_PIN_INDEX_CYCLE_START; }
+    // if (bit_istrue(pin,(1<<CONTROL_CYCLE_START_BIT))) { control_state |= CONTROL_PIN_INDEX_CYCLE_START; }
   }
   return(control_state);
 }
@@ -69,7 +69,7 @@ ISR(CONTROL_INT_vect)
       mc_reset();
     }
     if (bit_istrue(pin,CONTROL_PIN_INDEX_CYCLE_START)) {
-      bit_true(sys_rt_exec_state, EXEC_CYCLE_START);
+      //bit_true(sys_rt_exec_state, EXEC_CYCLE_START);
     }
     #ifndef ENABLE_SAFETY_DOOR_INPUT_PIN
       if (bit_istrue(pin,CONTROL_PIN_INDEX_FEED_HOLD)) {

looks like there might be a memory leak or something somewhere.
i dont think this simulation should use an entire core.

OS: Ubuntu 20.04
Hardware: Dell XPS 13 laptop, Intel 7i7, 4cores, 8GB RAM

1. I'm using Linux Mint 17 so I did change the sim makefile to linux.
2. grbl and grbl-sim at the same time with git clone didn't work easy... grbl-sim has one to many directories.
3. In the /grbl/config.h I had to remove : #define config_h
   otherwise it was not finding the default defines?
4. /grbl/print.c:209
   I had to comment line 209 in print.c (some memory debug function, not used in sim)
5. /grbl/sim/simulator.c:199: renamed get_direction_mask to get_direction_pin_mask
6. Add the serial in front: rx_buffer_* to serial_rx_buffer_*
   /grbl/sim/serial.c:66: extern volatile uint8_t serial_rx_buffer_head;
   /grbl/sim/serial.c:67 extern volatile uint8_t serial_rx_buffer_tail;
   /grbl/sim/serial.c:69: rx_buffer_head' to serial_rx_buffer_head /grbl/sim/serial.c:71:rx_buffer_tail' to serial_rx_buffer_tail
7. now after running the sim.sh it shows me the plot

@ashelly @jgeisler0303 : Do either of you guys have a bit of time update Grbl simulator to compile with Grbl v1.1? I'd like to use this for development testing. I don't quite understand the include voodoo you guys did. There are a lot of include errors when I tried to compile v1.1 and v0.9j. If it's something on my end, what are the system requirements? I can use vagrant to setup a quick dev virtual machine.

Hello, I successfully compiled sim. But do not know how to use it to achieve visual debugging, such as real-time display of grbl buffer block running state, or visualization speed?

On my LinuxMint machine I needed to run socat as sudo, at which point the /dev/ttyFAKE device is owned by root.root instead of root.dialout. At this point my GUI application can connect to /dev/ttyFAKE just fine when I run it as root, but I'd rather not have to run my IDE/debugger as root if I can find a way to avoid that.

After compiling the code on windows 7, I installed "Virtual Com Port Driver" but I realized I have no handle to connect the executable with the com port. I tried a simple redirect > but that's unidirectional so it's a Nogo.

Is there a way to do that on windows without implementing it the code?

During compiling with "make new" command I keep getting the following error.

./config.h:28:10: fatal error: ../system.h: No such file or directory
#include "../system.h"

as well as for
#include "../planner.h"
#include "../settings.h"

Are there missing files?

Thanks

I had to make the following changes on the makefile to be able to compile with ming32-make on win7:

-change relative paths from ../ to ..\
-change rm -f command to del
-$(CC) was not recognised, I changed the line to gcc

To avoid messing with the makefile, I tried to compile through Cygwin but file conio.h was not found (it's a windows file), so I changed it to curses.h but then some function calls were not identified, so I gave up on this approach although it's probably simple to correct/modify.

Hi, cool project. Thanks for the work so far; It's been helpful while developing a GRBL control program.

I've got an issue though:
When i push enough commands to fill Grbl's planner buffer, realtime commands stop working. eg: "?" no longer triggers a status update.

My system:

duncan@lapdancer:~/Working/grbl-master/grbl/grbl-sim$ uname -a
Linux lapdancer 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
duncan@lapdancer:~/Working/grbl-master/grbl/grbl-sim$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.4.0-1ubuntu1~18.04.1' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1) 
duncan@lapdancer:~/Working/grbl-master/grbl/grbl-sim$ ./grbl_sim.exe 
# 
# Grbl 1.1h ['$' for help]
$I
# [VER:1.1h.20190830:]
# [OPT:V,15,128]
# ok

Steps to reproduce:

duncan@lapdancer:~/Working/grbl-master/grbl/grbl-sim$ ./grbl_sim.exe 
# 
# Grbl 1.1h ['$' for help]
G00 F10 X1000 G91
250000, 0, 0, 0.000000
# ok
#  <Run|MPos:0.004,0.000,0.000|FS:54,0|Pn:PXYZRHS|WCO:0.000,0.000,0.000>
G00 F10 X1000 G91
500000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
750000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
1000000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
1250000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
1500000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
1750000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
2000000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
2250000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
2500000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
2750000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
3000000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
3250000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
3500000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
3750000, 0, 0, 250000.000000
# ok
G00 F10 X1000 G91
#  <Run|MPos:0.304,0.000,0.000|FS:174,0|Pn:PXYZRHS|Ov:100,100,100>
# ?????????# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
#  <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# ?????????# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
#  <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# ?# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# ??# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# ?????????# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# # <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# # <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# ???????????????# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# # <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# ????????????# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# # <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# ??# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>
# ???????# <Run|MPos:0.388,0.000,0.000|FS:192,0|Pn:PXYZRHS>

You can see above me sending Gcode until i stop getting "ok" back. Ie, the planner buffer has filled.
After that, sometimes a "?" returns a status report but usually it does not.

I've dug around in the code for a day.
Grbl's ISR(SERIAL_RX) is definitely receiving the serial port data.
The following modifications can be used to prove this:
in ./grbl-sim/serial.c:

[...SNIP...]

extern volatile uint8_t serial_tx_buffer_head;
extern volatile uint8_t serial_tx_buffer_tail;
extern volatile uint8_t serial_rx_buffer_head;
extern volatile uint8_t serial_rx_buffer_tail;
extern volatile uint8_t sys_rt_exec_state;
void simulate_read_interrupt(){
  uint8_t char_in = platform_poll_stdin();
  if (char_in) {
	 UDR0 = char_in;
	 //EOF or CTRL-F to exit
	 if (UDR0 == EOF || UDR0 == 0xFF || UDR0 == 0x06 ) {
		sim.exit = exit_REQ;
	 }
	 //debugging
	 if (UDR0 == '%') { 
		printf("%ld %f\n",sim.masterclock,(double)sim.sim_time);
		printf("serial_tx_buffer_tail: %i    serial_tx_buffer_head: %i\n",
		    serial_tx_buffer_tail, serial_tx_buffer_head);
		printf("serial_rx_buffer_tail: %i    serial_rx_buffer_head: %i\n",
		    serial_rx_buffer_tail, serial_rx_buffer_head);
		printf("sys_rt_exec_state: 0x%x\n", sys_rt_exec_state);
	 }
	 interrupt_SERIAL_RX();
	
	 // The following line shows the  EXEC_STATUS_REPORT flag is always correctly set.
	 printf("sys_rt_exec_state: 0x%x\n", sys_rt_exec_state);
  }
}

uint8_t count = 0;
void simulate_serial(){
  simulate_write_interrupt();
  simulate_read_interrupt();
}

If you compile the above you'll see the serial_rx_buffer is still filling for all non realtime commands
and for realtime commands the flags are getting set in sys_rt_exec_state.

So since realtime commands work /before/ the planned buffer fills but not afterwards...
i presume Grbl is making more calls to protocol_execute_realtime() in the before case.
I can't seem to find where in Grbl code consuming data from serial_read() blocks once the planned buffer is full....

Any thoughts?

no issues here, just in case somebody (including future me) needs it:
install compiler:
sudo apt-get install mingw-w64
edit Makefile:
PLATFORM = WINDOWS
CC = /etc/alternatives/i686-w64-mingw32-gcc
WINDOWS_LIBRARIES = -I /usr/i686-w64-mingw32/include

do not make grbl 1.1 into a grbl-sim.

make constantly shows errors

please help, someone can send me a finished grbl-sim

sorry bad english, google translate

Robert

“Each of the AVR functions are replaced with dummy functions, like the stepper ISR. These could be written to do whatever you need. For example, output simulated step pulses over time and examine its performance.”
I have successfully compiled and run grbl-sim, but I actually want to use a computer to display the ISR step pulse waveform, etc., so as to realize online virtual debugging and running away from analysis. Do you know what I should do or have any suggestions? Thank you

Is there anybody who has a working build who could add the binaries as a release?

It would really lower the barrier of using this if we could avoid having to set up a build environment :)

Hi guys,
with original code I was not able to use < input redirection on Windows, to read g-code from file. I think root cause is using _kbhit() and getch().

Did quick fix that works for me:

From 05fd7ab068552fc7955d9d50132efa727da3818f Mon Sep 17 00:00:00 2001
From: Oleksiy Bondarenko [email protected]
Date: Mon, 2 Nov 2015 12:51:01 -0500
Subject: [PATCH] Made windows version stdin redirect friendly

Makefile | 4 ++--
platform_WINDOWS.c | 32 +++++++++++++++++++++++++++-----
sim.bat | 4 +++-
3 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index a6945bd..298123f 100644
--- a/Makefile
+++ b/Makefile
@@ -16,9 +16,9 @@

You should have received a copy of the GNU General Public License

along with Grbl. If not, see http://www.gnu.org/licenses/.

-# PLATFORM = WINDOWS
+PLATFORM = WINDOWS

PLATFORM = OSX

-PLATFORM = LINUX
+# PLATFORM = LINUX

#The original grbl code, except those files overriden by sim
GRBL_BASE_OBJECTS = ../protocol.o ../planner.o ../settings.o ../print.o ../nuts_bolts.o ../stepper.o ../gcode.o ../spindle_control.o ../motion_control.o ../limits.o ../coolant_control.o ../probe.o ../system.o
diff --git a/platform_WINDOWS.c b/platform_WINDOWS.c
index 7c4a3c3..71b8224 100644
--- a/platform_WINDOWS.c
+++ b/platform_WINDOWS.c
@@ -31,12 +31,32 @@

double ns_per_perfcount;

+volatile struct {

• //CRITICAL_SECTION m_lock;
• bool isEmpty;
• int content;
  +} stdin_q;

+PLAT_THREAD_FUNC(stdin_poller, exit)
+{

• while (true) {

•    if (stdin_q.isEmpty) {
  

•        stdin_q.content = getchar();
  

•        stdin_q.isEmpty = false;
  

•    }
  

•    Sleep(1);
  

• }
• return NULL;
  +}

//any platform-specific setup that must be done before sim starts here
void platform_init()
{
__int64 counts_per_sec;
QueryPerformanceFrequency((LARGE_INTEGER*)&counts_per_sec);
ns_per_perfcount = (float)NS_PER_SEC / counts_per_sec;

• platform_start_thread(stdin_poller);
  }

//cleanup int here;
@@ -62,7 +82,6 @@ void platform_sleep(long microsec)
{
Sleep(microsec/MICRO_PER_MILLI);

}

//create a thread
plat_thread_t* platform_start_thread(plat_threadfunc_t threadfunc) {
@@ -89,8 +108,11 @@ void platform_kill_thread(plat_thread_t* th){

//return char if one available.
uint8_t platform_poll_stdin() {

• if (_kbhit()) {

• return getch();
  

• }
• return 0;
• if (!stdin_q.isEmpty) {

•    volatile int tmp = stdin_q.content;
  

•    putchar(tmp);
  

•    stdin_q.isEmpty = true;
  

•    return tmp;
  

• }
• return 0;
  }
  diff --git a/sim.bat b/sim.bat
  index ea3b05e..8dcd46b 100755
  --- a/sim.bat
  +++ b/sim.bat
  @@ -1 +1,3 @@
  -./grbl_sim.exe -t 1 0.01 <HelloWorld.nc >HelloWorld.dat 2> HelloWorldSteps.dat
  +@Rem grbl_sim -h
  +@Rem gdb --args
  +grbl_sim.exe -r 1 -t 1 -s HelloWorldSteps.dat 0.01 0<test.nc 1>out.txt
  --
  1.9.5.msysgit.1

trying to get this up and running on my ubuntu 20.04 workstation and seeing a build error.

ive cloned this repo into the grbl/grbl/ source directory as specified in the instructions and still am seeing this error.

any advice?

grbl_interface.c: In function ‘print_steps’:
grbl_interface.c:84:6: error: ‘SPINDLE_TCCRA_REGISTER’ undeclared (first use in this function); did you mean ‘TCCRA_REGISTER’?
   84 |   if(SPINDLE_TCCRA_REGISTER >= 127) ocr = SPINDLE_OCR_REGISTER;
      |      ^~~~~~~~~~~~~~~~~~~~~~
      |      TCCRA_REGISTER
grbl_interface.c:84:6: note: each undeclared identifier is reported only once for each function it appears in
grbl_interface.c:84:43: error: ‘SPINDLE_OCR_REGISTER’ undeclared (first use in this function)
   84 |   if(SPINDLE_TCCRA_REGISTER >= 127) ocr = SPINDLE_OCR_REGISTER;
      |                                           ^~~~~~~~~~~~~~~~~~~~
grbl_interface.c:94:75: error: ‘sys_position’ undeclared (first use in this function); did you mean ‘block_position’?
   94 |      fprintf(args.step_out_file, "%12.5f %d, %d, %d, %d\n", sim.sim_time, sys_position[X_AXIS], sys_position[Y_AXIS], sys_position[Z_AXIS],ocr);
      |                                                                           ^~~~~~~~~~~~
      |                                                                           block_position
make: *** [Makefile:64: grbl_interface.o] Error 1

Compiling on a Raspberry Pi 3B. When I run make new I get the following error. Is there some dependencies or something I need to install before trying to compile?

cc -Wall -g -O3 -DF_CPU=16000000 -include config.h -I. -DPLAT_LINUX -o grbl_sim.exe grbl_interface.o ../protocol.o ../planner.o ../settings.o ../print.o ../nuts_bolts.o ../stepper.o ../gcode.o ../spindle_control.o ../motion_control.o ../limits.o ../coolant_control.o ../probe.o ../system.o ../jog.o ../main.o ../serial.o ../report.o main.o simulator.o serial.o util/delay.o util/floatunsisf.o platform_LINUX.o system_declares.o avr/interrupt.o avr/pgmspace.o avr/io.o avr/eeprom.o grbl_eeprom_extensions.o -lm -lrt -pthread
/usr/bin/ld: /usr/lib/gcc/arm-linux-gnueabihf/8/libgcc.a(_arm_addsubsf3.o): in function __aeabi_ui2f': (.text+0x19c): multiple definition of __floatunsisf'; util/floatunsisf.o:/home/pi/grbl/grbl/grbl-sim/util/floatunsisf.c:3: first defined here
collect2: error: ld returned 1 exit status
make: *** [Makefile:56: main] Error 1