1 files changed, 59 insertions, 0 deletions
diff --git a/Marlin/src/HAL/STM32/fast_pwm.cpp b/Marlin/src/HAL/STM32/fast_pwm.cpp
new file mode 100644
index 0000000..42eecb5
--- /dev/null
+++ b/Marlin/src/HAL/STM32/fast_pwm.cpp
@@ -0,0 +1,59 @@
+/**
+ * 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/>.
+ *
+ */
+#if defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
+
+#include "../../inc/MarlinConfigPre.h"
+
+#if NEEDS_HARDWARE_PWM
+
+#include "HAL.h"
+#include "timers.h"
+
+void set_pwm_frequency(const pin_t pin, int f_desired) {
+  if (!PWM_PIN(pin)) return;            // Don't proceed if no hardware timer
+
+  PinName pin_name = digitalPinToPinName(pin);
+  TIM_TypeDef *Instance = (TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM); // Get HAL timer instance
+
+  LOOP_S_L_N(i, 0, NUM_HARDWARE_TIMERS) // Protect used timers
+    if (timer_instance[i] && timer_instance[i]->getHandle()->Instance == Instance)
+      return;
+
+  pwm_start(pin_name, f_desired, 0, RESOLUTION_8B_COMPARE_FORMAT);
+}
+
+void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) {
+  PinName pin_name = digitalPinToPinName(pin);
+  TIM_TypeDef *Instance = (TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM);
+  uint16_t adj_val = Instance->ARR * v / v_size;
+  if (invert) adj_val = Instance->ARR - adj_val;
+
+  switch (get_pwm_channel(pin_name)) {
+    case TIM_CHANNEL_1: LL_TIM_OC_SetCompareCH1(Instance, adj_val); break;
+    case TIM_CHANNEL_2: LL_TIM_OC_SetCompareCH2(Instance, adj_val); break;
+    case TIM_CHANNEL_3: LL_TIM_OC_SetCompareCH3(Instance, adj_val); break;
+    case TIM_CHANNEL_4: LL_TIM_OC_SetCompareCH4(Instance, adj_val); break;
+  }
+}
+
+#endif // NEEDS_HARDWARE_PWM
+#endif // ARDUINO_ARCH_STM32 && !STM32GENERIC