交错中性光低亮PDM脉冲

2026-07-28 12:33:47 +08:00
parent 6b6a72d0ef
commit d80074def7
1 changed files with 10 additions and 1 deletions
@@ -277,7 +277,16 @@ __RAM_CODE void Bridge_Deadtime_Expired(void)
            (!frame_pdm_enabled ||
             frame_pdm_threshold != pdm_threshold)) {
            pdm_w_accumulator = pdm_threshold - w_step;
-            pdm_c_accumulator = pdm_threshold - c_step;
+            /*
+             * A 50:50 neutral target gives W and C identical PDM steps.
+             * Start C half a density cycle away from W so their optical
+             * pulses are spread across different frames instead of arriving
+             * as one bright pair followed by a long dark gap.
+             */
+            if (pdm_threshold == BRIDGE_NEUTRAL_PDM_THRESHOLD)
+                pdm_c_accumulator = pdm_threshold / 2U;
+            else
+                pdm_c_accumulator = pdm_threshold - c_step;
        }
        frame_pdm_enabled = pdm_enabled;
        frame_pdm_threshold = pdm_enabled ? pdm_threshold : 0U;