From d7b6acc03d03796e34ab0d293cc8be88b4657fda Mon Sep 17 00:00:00 2001
From: Mihai <299015+mh-dm@users.noreply.github.com>
Date: Sun, 16 Jun 2024 01:55:45 +0300
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=EF=B8=8F=20Optimize=20LPC176x=20set?=
 =?UTF-8?q?=5Fpwm=5Fduty=20(#27178)?=
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---
 Marlin/src/HAL/LPC1768/fast_pwm.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Marlin/src/HAL/LPC1768/fast_pwm.cpp b/Marlin/src/HAL/LPC1768/fast_pwm.cpp
index 6d2b1a9002..7cb212f5f9 100644
--- a/Marlin/src/HAL/LPC1768/fast_pwm.cpp
+++ b/Marlin/src/HAL/LPC1768/fast_pwm.cpp
@@ -26,8 +26,10 @@
 
 void MarlinHAL::set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) {
   if (!LPC176x::pin_is_valid(pin)) return;
-  if (LPC176x::pwm_attach_pin(pin))
-    LPC176x::pwm_write_ratio(pin, invert ? 1.0f - (float)v / v_size : (float)v / v_size);  // map 1-254 onto PWM range
+  if (LPC176x::pwm_attach_pin(pin)) {
+    const uint32_t duty = map(invert ? v_size - v : v, 0, v_size, 0, LPC176x::pwm_get_period(pin));
+    LPC176x::pwm_write(pin, duty);
+  }
 }
 
 void MarlinHAL::set_pwm_frequency(const pin_t pin, const uint16_t f_desired) {