From 65aa62ebabf5b21e32906f6656af2c6219badb05 Mon Sep 17 00:00:00 2001
From: Robert Pelnar <robert.pelnar@seznam.cz>
Date: Fri, 20 Apr 2018 13:17:18 +0200
Subject: [PATCH] XYZ cal fix (better histogram processing)

---
 Firmware/xyzcal.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Firmware/xyzcal.cpp b/Firmware/xyzcal.cpp
index 4e4309b3..b8739640 100644
--- a/Firmware/xyzcal.cpp
+++ b/Firmware/xyzcal.cpp
@@ -384,8 +384,12 @@ void xyzcal_adjust_pixels(uint8_t* pixels, uint16_t* histo)
 	for (l = 14; l > 8; l--)
 		if (histo[l] >= 10)
 			break;
-	uint8_t pix_min = (max_l << 4) / 2;
+	uint8_t pix_min = 0;
 	uint8_t pix_max = l << 4;
+	if (histo[0] < (32*32 - 144))
+	{
+		pix_min = (max_l << 4) / 2;
+	}
 	uint8_t pix_dif = pix_max - pix_min;
 	DBG(_n(" min=%d max=%d dif=%d\n"), pix_min, pix_max, pix_dif);
 	for (int16_t i = 0; i < 32*32; i++)