Differences

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--- sw:uc [2009/01/25 12:18] – angelegt 172.22.1.222
+++ sw:uc [2024/04/15 00:43] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== ATmega ======
+==== PROGMEM ====
+=== Strings + Array ===
+<code c>
+  #include <avr/pgmspace.h>
+  const char ptmpUP_msg[]      PROGMEM = "Upper Temp";
+  const char ptmpDN_msg[]      PROGMEM = "Lower Temp";
+  const char ptmpCLG_msg[]     PROGMEM = "Chiller Temp";
+  const char* const pgtmp_msg[]  PROGMEM =
+  { ptmpUP_msg, ptmpDN_msg,  ptmpCLG_msg };
+</code>
+oder alternativ mit flash statt PROGMEM:
+<code c>
+  const __flash char ptmpUP_msg[]  = "Upper Temp";
+  const __flash char ptmpDN_msg[]  = "Lower Temp";
+  const __flash char ptmpCLG_msg[] = "Chiller Temp";
+  const __flash char* const __flash pgtmp_msg[] =
+  { ptmpUP_msg, ptmpDN_msg,  ptmpCLG_msg };
+</code>
+<code>
+  pgtmp_msg is const and located in flash.  And it contains elements that are
+  pointers to const locations in flash.
+</code>
+=== Functionpointer===
+<code>
+Your functions are of prototype "void (*)(void)", not of "void (*)()".
+And the return type is "void", not "__flash void"; avr-gcc throws a
+diagnostic on this.
+</code>
+If you want to put the array in flash, then put funcArray in flash:
+<code c>
+void func1 (void) {}
+void func2 (void) {}
+void func3 (void) {}
+void (* const __flash funcArray[])(void) = { func1, func2, func3 } ;
+void run (unsigned char funcNo){
+   funcArray[funcNo] ();
+   }
+</code>
 ====== Quadratwurzel ======
 The simplest square root algorithm is to simply subtract successive odd
@@ Line 4: / Line 54: @@
 (9-1=8) (8-3=5) (5-5=0)\\
 Three subtractions so the sq root of nine is 3.
 ====== Dezimalbrüche und Brüche wandeln ======
 z.B.faktor=2.12345676\\