Arduino cheat sheet: Difference between revisions

Arduino cheat sheet (view source)

795 bytes added , 27 October 2015

7,166

edits

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 Divide by PI: ((((uint32_t)A * (uint32_t)0x45F3) >> 16) + A) >> 1) >> 1
 Divide by √2: (((uint32_t)A * (uint32_t)0xB505) >> 16) >> 0
+</syntaxhighlight>
+==== modulus (%) ====
+ [http://embeddedgurus.com/stack-overflow/2011/02/efficient-c-tip-13-use-the-modulus-operator-with-caution/ Efficient C Tip #13 – use the modulus (%) operator with caution « Stack Overflow]
+<syntaxhighlight lang="c" enclose="div">
+void display_value(uint16_t value)
+{
+ uint8_t    msd, nsd, lsd;
+ if (value > 999)
+ {
+ value = 999;
+ }
+ lsd = value % 10;
+ value /= 10;
+ nsd = value % 10;
+ value /= 10;
+ msd = value;
+ /* Now display the digits */
+}
+</syntaxhighlight>
+<syntaxhighlight lang="c" enclose="div">
+void display_value(uint16_t value)
+{
+ uint8_t    msd, nsd, lsd;
+ if (value > 999U)
+ {
+  value = 999U;
+ }
+ msd = value / 100U;
+ value -= msd * 100U;
+ nsd = value / 10U;
+ value -= nsd * 10U;
+ lsd = value;
+ /* Now display the digits */
+}
 </syntaxhighlight>