Status and Limit Switches on GRBL 13.2 M035 Model
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I am trying to read the limit switches and other configuration data from the module using the Module_GRBL_13.2.h library. I wrote a simple script to read commands from Serial and write them to the module with driver.sendGcode(cmdBuffer); I then read the response with driver.readLine() return some info that looks like a mixture of corrupted plus valid data. If I use driver.readStatus() I only get "IDLE" or "BUSY" back. Here is a example of what I get after sending a command:
Sending command: ?
Raw response.length() 134 response=<Idle,MPos3�o�!�?� �?:0.000,0.03�o�!�?� �?00,0.000,W3�o�!�?� �?Pos:0.000,3�o�!�?� �?0.000,0.003�o�!�?� �?0>Sending command: $$
Raw response.length() 271 response=$0=80.000 3�o�!�?� �?(x, step/m3�o�!�?� �?m)
$1=80.3�o�!�?� �?000 (y, st3�o�!�?� �?ep/mm)
$23�o�!�?� �?=80.000 (z3�o�!�?� �?, step/mm)3�o�!�?� �?
$3=10 (s3�o�!�?� �?tep pulse,3�o�!�?� �? usec)
$43�o�!�?� �?=250.000 (3�o�!�?� �?default fe3�o�!�?� �?ed, mm/I happen to have two modules stacked in the Core2 AWS and both 70 and 71 do this.
Any help appreciated.
Kurt
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I have determined that this is a problem in the library. Probably a buffer overrun. It reads exactly 10 bytes at a time, always, and uses a fixed-length buffer (char data;). If more data is pending, it might clobber/lose lines. Almost all I2C read code in the library cannot cope with variable-length GRBL output. I am rewriting those parts of the library.