交错中性光低亮PDM脉冲

project/example/ble/ble_peripheral/app/src/bridge_pwm.c

@@ -277,6 +277,15 @@ __RAM_CODE void Bridge_Deadtime_Expired(void)
             (!frame_pdm_enabled ||
              frame_pdm_threshold != pdm_threshold)) {
             pdm_w_accumulator = pdm_threshold - w_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;