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    Status and Limit Switches on GRBL 13.2 M035 Model

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    • I
      ispybadguys
      last edited by

      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
        ispybadguys
        last edited by

        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.

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