Differences

This shows you the differences between two versions of the page.

--- how_to_mix_c_and_asm [2006/05/11 10:37]
audiocommander created
+++ how_to_mix_c_and_asm [2006/10/15 09:35]
127.0.0.1 (old revision restored)
@@ Line 1: / Line 1: @@
+It's actually quite easy!
+As you can see in the example below, just enclose the ASM part with //_////_asm// and //_////_endasm;//
+You might have to declare some additional variables, but the concept is quite straightforward.
+<code c>
+unsigned char Scale_7bit(unsigned char evnt2, unsigned char min, unsigned char max)
+{
+  // scaled value is (<8-bit random> * ) >> 8
+  PRODL = evnt2 << 1; // 8bit value
+  PRODH = max-min+1;  // range
+__asm
+    movf _PRODL, W
+    mulwf _PRODH, 0
+__endasm;
+  return min + PRODH;
+}
+</code>

MIDIbox