add dynamic configuration and begin configuration of double H bridge driver l293d

cnc/config.py

@@ -53,23 +53,36 @@ BED_PID = {"P": 0.226740848076,
 # Pins configuration.
 
 # Enable pin for all steppers, low level is enabled.
+ENABLE_STEPPER_ENABLE_PIN = False
 STEPPERS_ENABLE_PIN = 26
 STEPPER_STEP_PIN_X = 21
 STEPPER_STEP_PIN_Y = 16
 STEPPER_STEP_PIN_Z = 12
 STEPPER_STEP_PIN_E = 8
+ENABLE_L293D = True
+if ENABLE_L293D:
+    STEPPER_STEP_PINS_X = [4,17,27,22]
+    STEPPER_STEP_PINS_Y = []
+    ENABLE_FULL_STEP = False
+    ENABLE_HALF_STEP = True
 
 STEPPER_DIR_PIN_X = 20
 STEPPER_DIR_PIN_Y = 19
 STEPPER_DIR_PIN_Z = 13
 STEPPER_DIR_PIN_E = 7
 
+ENABLE_SPINDLE = False
 SPINDLE_PWM_PIN = 4
+ENABLE_FAN = False
 FAN_PIN = 27
+ENABLE_EXTRUDER_HEATER = False
 EXTRUDER_HEATER_PIN = 18
+ENABLE_BED_HEATER = False
 BED_HEATER_PIN = 22
-EXTRUDER_TEMPERATURE_SENSOR_CHANNEL = 2
-BED_TEMPERATURE_SENSOR_CHANNEL = 1
+if ENABLE_EXTRUDER_HEATER:
+    EXTRUDER_TEMPERATURE_SENSOR_CHANNEL = 2
+if ENABLE_BED_HEATER:
+    BED_TEMPERATURE_SENSOR_CHANNEL = 1
 
 ENDSTOP_PIN_X = 23
 ENDSTOP_PIN_Y = 10