fix(ledc): prevent potential underflow causes multi-fade param calculation errors

Closes https://github.com/espressif/esp-idf/issues/17980
2026-10-02 03:00:34 +03:00 · 2026-02-26 16:26:58 +08:00
parent 67290da88f
commit 6987aca1ce
1 changed files with 4 additions and 0 deletions
@@ -1828,6 +1828,10 @@ esp_err_t ledc_fill_multi_fade_param_list(ledc_mode_t speed_mode, ledc_channel_t
                scale = LEDC_LL_DUTY_SCALE_MAX;
            }
            step = duty_delta / scale;
+            // Ensure step * cycle doesn't exceed cycles_per_phase to prevent underflow to surplus_cycles_last_phase
+            if (step > cycles_per_phase) {
+                step = cycles_per_phase;
+            }
        }

        // Prepare for next phase calculation