+uint16_t vblperf_color[] = {0x3e0, 0xffc0, 0x3ff, 0x1ff, 0x001f, 0xf81f};
+
+static void vblperf_intr(void)
+{
+ vblperf_count++;
+}
+
+void vblperf_start(int palidx)
+{
+ vblperf_palptr = (uint16_t*)CRAM_BG_ADDR + palidx;
+ intr_disable();
+ REG_DISPSTAT |= DISPSTAT_IEN_VBLANK;
+ interrupt(INTR_VBLANK, vblperf_intr);
+ unmask(INTR_VBLANK);
+ intr_enable();
+}
+
+void vblperf_stop(void)
+{
+ intr_disable();
+ REG_DISPSTAT &= ~DISPSTAT_IEN_VBLANK;
+ interrupt(INTR_VBLANK, 0);
+ mask(INTR_VBLANK);
+ intr_enable();
+}
+