Better fix to ensure no adjacent register write opcodes to optimize o…

…ut on esp32
FastLED · Jan 20, 2019 · 5618f23 · 5618f23
1 parent db26028
commit 5618f23
Showing 1 changed file with 11 additions and 2 deletions.
diff --git a/fastspi_bitbang.h b/fastspi_bitbang.h
@@ -124,14 +124,23 @@ class AVRSoftwareSPIOutput {
 		if(b & (1 << BIT)) {
 			FastPin<DATA_PIN>::hi();
 #ifdef ESP32
-			FastPin<CLOCK_PIN>::lo(); // kick a different register, block premature optimizations?
-#endif
+			// try to ensure we never have adjacent write opcodes to the same register
+			FastPin<CLOCK_PIN>::lo();
+			FastPin<CLOCK_PIN>::hi(); CLOCK_HI_DELAY; 
+			FastPin<CLOCK_PIN>::toggle(); CLOCK_LO_DELAY; 
+#else
 			FastPin<CLOCK_PIN>::hi(); CLOCK_HI_DELAY;
 			FastPin<CLOCK_PIN>::lo(); CLOCK_LO_DELAY;
+#endif
 		} else {
 			FastPin<DATA_PIN>::lo();
 			FastPin<CLOCK_PIN>::hi(); CLOCK_HI_DELAY;
+#ifdef ESP32
+			// try to ensure we never have adjacent write opcodes to the same register
+			FastPin<CLOCK_PIN>::toggle(); CLOCK_HI_DELAY; 
+#else
 			FastPin<CLOCK_PIN>::lo(); CLOCK_LO_DELAY;
+#endif
 		}
 		//sei();
 	}