Updates docs\Bleeding_Edge.md example macro for pa tuning so that a f… (

#240)

* Updates docs\Bleeding_Edge.md example macro for pa tuning so that a finer tuning of pa is possible

* Update Bleeding_Edge.md

Remove redundant if statement.
Update documentation.

docs/Bleeding_Edge.md

@@ -287,9 +287,26 @@ gcode:
     # M109 S{vars.hotend_temp}
     {% set flow_percent = vars.flow_rate|float * 100.0 %}
     {% if flow_percent > 0 %}
-    M221 S{flow_percent}
+        M221 S{flow_percent}
+    {% endif %}
+    {% set height = printer.configfile.settings.pa_test.height %}  
+    {% set pavalue = vars.pa_value %}
+    ; If pa_value is 0 then we test the full pa range starting from 0
+    {% if  vars.pa_value == 0 %} 
+        TUNING_TOWER COMMAND=SET_PRESSURE_ADVANCE PARAMETER=ADVANCE START=0 FACTOR=.005
+    {% else %}
+        ; make sure that delta and start can not be lower then 0
+        {% if vars.pa_value - vars.pa_range <= 0%} 
+            {% set delta = vars.pa_range %}
+            {% set start = 0 %}
+        {% else %}
+            ; calculate the pa range that we want to test
+            {% set delta = (vars.pa_value + vars.pa_range)  - (vars.pa_value - vars.pa_range)  %} 
+            ; calculate the pa start value
+            {% set start = vars.pa_value - vars.pa_range %} 
+        {% endif %}
+        TUNING_TOWER COMMAND=SET_PRESSURE_ADVANCE PARAMETER=ADVANCE START={start} FACTOR={delta / height}
     {% endif %}
-    TUNING_TOWER COMMAND=SET_PRESSURE_ADVANCE PARAMETER=ADVANCE START=0 FACTOR=.005
     ; PRINT_PA_TOWER must be the last command in the start_pa_test script:
     ; it starts a print and then immediately returns without waiting for the print to finish
     PRINT_PA_TOWER {vars.rawparams} FINAL_GCODE_ID=end_pa_test
@@ -310,6 +327,8 @@ gcode:
 [gcode_macro RUN_PA_TEST]
 variable_bed_temp: -1
 variable_hotend_temp: -1
+variable_pa_value: 0             # Used for further tuning of pa value. If value is not 0 than the tested pa value will only be +/- (determined by the pa_range variable) around of the pa_value variable
+variable_pa_range: 0.03          # Only use if pa_value is set to heigher than 0. Used to set the +/- area around pa_value that should be tested
 variable_flow_rate: -1
 variable_rawparams: ''
 gcode:
@@ -322,6 +341,8 @@ gcode:
     {% endif %}
     SET_GCODE_VARIABLE MACRO=RUN_PA_TEST VARIABLE=bed_temp VALUE={params.BED_TEMP|default(60)}
     SET_GCODE_VARIABLE MACRO=RUN_PA_TEST VARIABLE=hotend_temp VALUE={params.TARGET_TEMP}
+    SET_GCODE_VARIABLE MACRO=RUN_PA_TEST VARIABLE=pa_value VALUE={params.PA_VALUE|default(0)}
+    SET_GCODE_VARIABLE MACRO=RUN_PA_TEST VARIABLE=pa_range VALUE={params.PA_RANGE|default(0.01)}
     SET_GCODE_VARIABLE MACRO=RUN_PA_TEST VARIABLE=flow_rate VALUE={params.FLOW_RATE|default(-1)}
     SET_GCODE_VARIABLE MACRO=RUN_PA_TEST VARIABLE=rawparams VALUE="'{rawparams}'"
     SAVE_GCODE_STATE NAME=PA_TEST_STATE