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1 files changed, 142 insertions, 0 deletions

diff --git a/Marlin/src/feature/power_monitor.h b/Marlin/src/feature/power_monitor.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include "../inc/MarlinConfig.h"
+
+#define PM_SAMPLE_RANGE 1024
+#define PM_K_VALUE      6
+#define PM_K_SCALE      6
+
+template <const float & SCALE, int K_VALUE, int K_SCALE>
+struct pm_lpf_t {
+  uint32_t filter_buf;
+  float value;
+  void add_sample(const uint16_t sample) {
+    filter_buf = filter_buf - (filter_buf >> K_VALUE) + (uint32_t(sample) << K_SCALE);
+  }
+  void capture() {
+    value = filter_buf * (SCALE * (1.0f / (1UL << (PM_K_VALUE + PM_K_SCALE)))) + (POWER_MONITOR_CURRENT_OFFSET);
+  }
+  void reset(uint16_t reset_value = 0) {
+    filter_buf = uint32_t(reset_value) << (K_VALUE + K_SCALE);
+    capture();
+  }
+};
+
+class PowerMonitor {
+private:
+  #if ENABLED(POWER_MONITOR_CURRENT)
+    static constexpr float amps_adc_scale = float(ADC_VREF) / (POWER_MONITOR_VOLTS_PER_AMP * PM_SAMPLE_RANGE);
+    static pm_lpf_t<amps_adc_scale, PM_K_VALUE, PM_K_SCALE> amps;
+  #endif
+  #if ENABLED(POWER_MONITOR_VOLTAGE)
+    static constexpr float volts_adc_scale = float(ADC_VREF) / (POWER_MONITOR_VOLTS_PER_VOLT * PM_SAMPLE_RANGE);
+    static pm_lpf_t<volts_adc_scale, PM_K_VALUE, PM_K_SCALE> volts;
+  #endif
+
+public:
+  static uint8_t flags;  // M430 flags to display current
+
+  static millis_t display_item_ms;
+  static uint8_t display_item;
+
+  PowerMonitor() { reset(); }
+
+  enum PM_Display_Bit : uint8_t {
+    PM_DISP_BIT_I, // Current display enable bit
+    PM_DISP_BIT_V, // Voltage display enable bit
+    PM_DISP_BIT_P  // Power display enable bit
+  };
+
+  #if ENABLED(POWER_MONITOR_CURRENT)
+    FORCE_INLINE static float getAmps() { return amps.value; }
+    void add_current_sample(const uint16_t value) { amps.add_sample(value); }
+  #endif
+
+  #if HAS_POWER_MONITOR_VREF
+    #if ENABLED(POWER_MONITOR_VOLTAGE)
+      FORCE_INLINE static float getVolts() { return volts.value; }
+    #else
+      FORCE_INLINE static float getVolts() { return POWER_MONITOR_FIXED_VOLTAGE; }  // using a specified fixed valtage as the voltage measurement
+    #endif
+    #if ENABLED(POWER_MONITOR_VOLTAGE)
+      void add_voltage_sample(const uint16_t value) { volts.add_sample(value); }
+    #endif
+  #endif
+
+  #if HAS_POWER_MONITOR_WATTS
+    FORCE_INLINE static float getPower() { return getAmps() * getVolts(); }
+  #endif
+
+  #if HAS_WIRED_LCD
+    #if HAS_MARLINUI_U8GLIB && DISABLED(LIGHTWEIGHT_UI)
+      FORCE_INLINE static bool display_enabled() { return flags != 0x00; }
+    #endif
+    #if ENABLED(POWER_MONITOR_CURRENT)
+      static void draw_current();
+      FORCE_INLINE static bool current_display_enabled() { return TEST(flags, PM_DISP_BIT_I); }
+      FORCE_INLINE static void set_current_display(const bool b) { SET_BIT_TO(flags, PM_DISP_BIT_I, b); }
+      FORCE_INLINE static void toggle_current_display() { TBI(flags, PM_DISP_BIT_I); }
+    #endif
+    #if HAS_POWER_MONITOR_VREF
+      static void draw_voltage();
+      FORCE_INLINE static bool voltage_display_enabled() { return TEST(flags, PM_DISP_BIT_V); }
+      FORCE_INLINE static void set_voltage_display(const bool b) { SET_BIT_TO(flags, PM_DISP_BIT_V, b); }
+      FORCE_INLINE static void toggle_voltage_display() { TBI(flags, PM_DISP_BIT_V); }
+    #endif
+    #if HAS_POWER_MONITOR_WATTS
+      static void draw_power();
+      FORCE_INLINE static bool power_display_enabled() { return TEST(flags, PM_DISP_BIT_P); }
+      FORCE_INLINE static void set_power_display(const bool b) { SET_BIT_TO(flags, PM_DISP_BIT_P, b); }
+      FORCE_INLINE static void toggle_power_display() { TBI(flags, PM_DISP_BIT_P); }
+    #endif
+  #endif
+
+  static void reset() {
+    flags = 0x00;
+
+    #if ENABLED(POWER_MONITOR_CURRENT)
+      amps.reset();
+    #endif
+
+    #if ENABLED(POWER_MONITOR_VOLTAGE)
+      volts.reset();
+    #endif
+
+    #if ENABLED(SDSUPPORT)
+      display_item_ms = 0;
+      display_item = 0;
+    #endif
+  }
+
+  static void capture_values() {
+    #if ENABLED(POWER_MONITOR_CURRENT)
+     amps.capture();
+    #endif
+    #if ENABLED(POWER_MONITOR_VOLTAGE)
+      volts.capture();
+    #endif
+  }
+};
+
+extern PowerMonitor power_monitor;