From: batt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 6 Feb 2008 15:25:01 +0000 (+0000)
Subject: Merge from kseries.
X-Git-Tag: 1.0.0~158
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=f1afe0bce11f8d2a5b739fdfb5e1a02d3dcd7d0a;hp=95653ebdc7081ad0c989e971fe4cab9bc8d1f945;p=bertos.git

Merge from kseries.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@1094 38d2e660-2303-0410-9eaa-f027e97ec537
---

diff --git a/mware/mean.h b/mware/mean.h
new file mode 100644
index 00000000..893241e2
--- /dev/null
+++ b/mware/mean.h
@@ -0,0 +1,41 @@
+#warning revise me!
+
+
+/**
+ *  DECLARE_SMEAN(temperature, uint8_t, uint16_t);
+ *  for (i = 0; i < TEMP_MEANS; ++i)
+ *    SMEAN_ADD(temperature, adc_get(), TEMP_MEANS);
+ *  printf("mean temperature = %d\n", SMEAN_GET(temperature));
+ */
+
+/**
+ * Instantiate a mean instance
+ */
+#define DECLARE_SMEAN(name, Type, SumType) \
+	struct { \
+		SumType sum; \
+		Type result; \
+		int count; \
+	} name = { 0, 0, 0 }
+
+/**
+ * Insert a new sample into the mean.
+ *
+ * \note \a mean and \a max_samples are evaluated multiple times
+ */
+#define SMEAN_ADD(mean, sample, max_samples) \
+	do { \
+		(mean).sum += (sample); \
+		if ((mean).count++ >= (max_samples)) \
+		{ \
+			(mean).result = (mean).sum / (max_samples); \
+			(mean).sum = 0; \
+			(mean).count = 0; \
+		} \
+	} while (0)
+
+/**
+ * Return current mean value.
+ */
+#define SMEAN_GET(mean)  ((mean).result)
+