Přidán článek AVR - LCD panel - wait.c

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articles/2012/avr-lcd-panel-waitc.md

++++
+
+title = "AVR - LCD panel - wait.c"
+perex_e = "
+
+Kompatibilní zapojení: LCD panel s ATmega8
+
+Ke stažení: wait.c == wait.pdf == wait.htm
+.
+.
+"
+tags = ["Článek"]
++++
+
+
+
+Kompatibilní zapojení: LCD panel s ATmega8
+
+Ke stažení: wait.c == wait.pdf == wait.htm
+.
+.
+
+* * *
+
+<title>Untitled</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta name="generator" content="SynEdit HTML exporter"> <style type="text/css">&amp;lt;!-- body { color: #000000; background-color: #FFFFFF; } .cpp1-assembler { } .cpp1-brackets { } .cpp1-comment { color: #008000; font-style: italic; } .cpp1-float { color: #000080; } .cpp1-hexadecimal { color: #000080; } .cpp1-character { } .cpp1-identifier { } .cpp1-illegalchar { } .cpp1-number { color: #000080; } .cpp1-octal { color: #0000FF; } .cpp1-preprocessor { } .cpp1-reservedword { font-weight: bold; } .cpp1-space { color: #008080; } .cpp1-string { color: #800000; } .cpp1-symbol { } --&amp;gt;</style> 
+
+```
+/*---------------------------------------------------------------------------
+
+soubor: wait.c
+verze:  1.0
+datum:  9.1.2012
+popis:
+
+Cekaci rutiny a makra pro bitove operace
+Cekaci rutiny jsou mnohem uspornejsi nez bezne "delay.h"
+
+Tento soubor vynikl ze souboru "mojelib.h" jehoz autora bohuzel neznam.
+
+---------------------------------------------------------------------------*/
+
+// Zmena bitu portu, IO registru nebo promenne:
+#define setb(bajt,bit)    bajt |= 1<<(bit)    //nastav bit
+#define clrb(bajt,bit)    bajt &= ~(1<<(bit)) //nuluj bit
+#define negb(bajt,bit)    bajt ^= 1<<(bit)    //neguj bit
+
+// Casove smycky:
+void wait_ms  (unsigned int c);              // cekej milisekund(max65553):
+void wait_us  (unsigned int c);              // cekej mikrosekund(max65553):
+
+//cekej milisekund:
+unsigned char reg21 = F_CPU / 60000;    // F_CPU = frekv. oscilatoru [Hz],
+                                        // (vnitrni konstanta prekladace)
+void wait_ms  (unsigned int c)
+{
+	asm("push	r20");
+	asm("push	r21");
+asm("_Wms0:");
+	asm("ldi	r20,0x14");
+asm("_Wms1:");
+	asm("lds	r21,reg21");
+asm("_Wms2:");
+	asm("dec	r21");
+	asm("brne	_Wms2");
+	asm("dec		r20");
+	asm("brne	_Wms1");
+	asm("dec	r24");
+	asm("brne	_Wms0");
+	asm("dec	r25");
+	asm("brpl	_Wms0");
+	asm("pop   	r21");
+	asm("pop   	r20");
+}
+
+//cekej mikrosekund:
+unsigned char reg20 = F_CPU / 6000000 + 1;
+void wait_us(unsigned int c)
+{
+	asm("push	r20");
+asm("_wus0:");
+	asm("lds	r20,reg20");  // 1-6MHz: r20=1  6-12MHz: r20=2
+asm("_wus1:");
+	asm("dec	r20");
+	asm("brne	_wus1");
+	asm("dec	r24");
+	asm("brne	_wus0");
+	asm("dec	r25");
+	asm("brpl	_wus0");
+	asm("pop	r20");
+}
+
+//eof
+//(c) OK1ZKV 2012 
+
+```
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