Initial commit of source code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 39 insertions, 0 deletions

diff --git a/klippy/fan.py b/klippy/fan.py
new file mode 100644
index 00000000..52374844
--- /dev/null
+++ b/klippy/fan.py
@@ -0,0 +1,39 @@
+# Printer fan support
+#
+# Copyright (C) 2016  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+
+FAN_MIN_TIME = 0.1
+
+class PrinterFan:
+    def __init__(self, printer, config):
+        self.printer = printer
+        self.config = config
+        self.mcu_fan = None
+        self.last_fan_clock = self.last_fan_value = 0
+        self.min_fan_clock = 0
+        self.kick_start_clock = 0
+    def build_config(self):
+        pin = self.config.get('pin')
+        hard_pwm = self.config.getint('hard_pwm', 128)
+        mcu_freq = self.printer.mcu.get_mcu_freq()
+        self.min_fan_clock = int(FAN_MIN_TIME * mcu_freq)
+        kst = self.config.getfloat('kick_start_time', 0.1)
+        self.kick_start_clock = int(kst * mcu_freq)
+        self.mcu_fan = self.printer.mcu.create_pwm(pin, hard_pwm, 0)
+    # External commands
+    def set_speed(self, print_time, value):
+        value = max(0, min(255, int(value*255. + 0.5)))
+        if value == self.last_fan_value:
+            return
+        pc = int(self.mcu_fan.get_print_clock(print_time))
+        pc = max(self.last_fan_clock + self.min_fan_clock, pc)
+        if (value and value < 255
+            and not self.last_fan_value and self.kick_start_clock):
+            # Run fan at full speed for specified kick_start_time
+            self.mcu_fan.set_pwm(pc, 255)
+            pc += self.kick_start_clock
+        self.mcu_fan.set_pwm(pc, value)
+        self.last_fan_clock = pc
+        self.last_fan_value = value