WebSVN – svnkaklik – Diff – /programy/Atmel_C/RS232toRS485/P232.c


//----------------------------------------------------------------------------------
//	Prevodnik RS232 <--> RS485
//	pri startbitu na RS232 zapne okamzite vysilac pokud nejsou detekovana data z RS485.
//----------------------------------------------------------------------------------
 
#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdlib.h>
#include <ctype.h>
#include <avr/eeprom.h>
#include <avr/pgmspace.h>
 
#define POVOLOVAK_LOW	PORTB &= ~(1<<PB3)
#define POVOLOVAK_HIGH  PORTB |= (1<<PB3)
#define DATA	(PIND & (1<<PD1))
 
volatile unsigned int preteceni;
unsigned int bit;
unsigned int bitdelay;
unsigned int last;
unsigned int cas;
 
ISR(TIMER0_OVF_vect)   // interrupt od preteceni casovace
{
  preteceni++;			// kdyz pretece, poznamenej to.
}
 
 
// ------------------------------------------------------------------
//	Main
// ------------------------------------------------------------------
int main(void)
{
 
  DDRD |= (1<<DDD5);
  DDRB |= (1<<DDB3);
 
  TIMSK |= (1 << TOIE0); // Enable timer overflow interrupt 
  TCCR0B |= (1 << CS10);  // Set up timer 
  sei();   // enable interrupts
 
  while(1)
  {
	if(!DATA)   // kdyz je 0 na datech 
	{ 
	  POVOLOVAK_HIGH;    // zapni vysilani
 
	  cas = 0xFFFF;
	  bitdelay = 0;
	  	  	  
	  for (bit=0;bit<=7;bit++) // odpocitej dobu 8mi bitu 
	  {
		last = DATA;
	    TCNT0 = 0;					// vynuluj citac pred tim, ne smazes preteceni, protoze jinak by se mohlo stat, ze se nastavi preteceni driv, nez ma
	    preteceni = 0;
 
	    while ((TCNT0+preteceni*0x0100) <= cas) // bit poznas tak, ze je to nejmensi nalezena delka trvaleho stavu
		{
		  bitdelay=TCNT0+preteceni*0x0100;
		  if(DATA != last)			// zkontroluj, jestli se nezmenil stav dat.
		  {
		    if (bitdelay < cas) cas = bitdelay; //kdyz se zmenil a trvalo to kratsi dobu nez pred tim poznemenej, jak dlouho to trvalo 
			break;
		  }
        }
	  }
	  while (!DATA);				// cekani na stop bit
 
/*	  for (bit=2;bit >= 0;bit--)    // odpocitej dva stopbity
	  {
	    TCNT0 = 0;					// zacni znova merit cas zacatku stopbitu
		preteceni=0;
 
	    while ((TCNT0+preteceni*0x0100) <= cas) 
		{
		  if(!DATA) break;
        }
	  }*/
    }
    else  POVOLOVAK_LOW;  	// kdyz je 1 prepni na prijem 
  }
  return(0);
}

Rev 303	Rev 304
1	`//----------------------------------------------------------------------------------`	1	`//----------------------------------------------------------------------------------`
2	`// Prevodnik RS232 <--> RS485`	2	`// Prevodnik RS232 <--> RS485`
3	`// pri startbitu na RS232 zapne okamzite vysilac pokud nejsou detekovana data z RS485.`	3	`// pri startbitu na RS232 zapne okamzite vysilac pokud nejsou detekovana data z RS485.`
4	`//----------------------------------------------------------------------------------`	4	`//----------------------------------------------------------------------------------`
5		5
6	`#include <avr/io.h>`	6	`#include <avr/io.h>`
7	`#include <avr/interrupt.h>`	7	`#include <avr/interrupt.h>`
8	`#include <stdlib.h>`	8	`#include <stdlib.h>`
9	`#include <ctype.h>`	9	`#include <ctype.h>`
10	`#include <avr/eeprom.h>`	10	`#include <avr/eeprom.h>`
11	`#include <avr/pgmspace.h>`	11	`#include <avr/pgmspace.h>`
12		12
13	`#define POVOLOVAK_LOW PORTB &= ~(1<<PB3)`	13	`#define POVOLOVAK_LOW PORTB &= ~(1<<PB3)`
14	`#define POVOLOVAK_HIGH PORTB \|= (1<<PB3)`	14	`#define POVOLOVAK_HIGH PORTB \|= (1<<PB3)`
15	`#define DATA (PIND & (1<<PD1))`	15	`#define DATA (PIND & (1<<PD1))`
16		16
17	`volatile unsigned int preteceni;`	17	`volatile unsigned int preteceni;`
18	`unsigned int bit;`	18	`unsigned int bit;`
19	`unsigned int bitdelay;`	19	`unsigned int bitdelay;`
20	`unsigned int last;`	20	`unsigned int last;`
21	`unsigned int cas;`	21	`unsigned int cas;`
22		22
23	`ISR(TIMER0_OVF_vect) // interrupt od preteceni casovace`	23	`ISR(TIMER0_OVF_vect) // interrupt od preteceni casovace`
24	`{`	24	`{`
25	`preteceni++; // kdyz pretece, poznamenej to.`	25	`preteceni++; // kdyz pretece, poznamenej to.`
26	`}`	26	`}`
27		27
28		28
29	`// ------------------------------------------------------------------`	29	`// ------------------------------------------------------------------`
30	`// Main`	30	`// Main`
31	`// ------------------------------------------------------------------`	31	`// ------------------------------------------------------------------`
32	`int main(void)`	32	`int main(void)`
33	`{`	33	`{`
34		34
35	`DDRD \|= (1<<DDD5);`	35	`DDRD \|= (1<<DDD5);`
36	`DDRB \|= (1<<DDB3);`	36	`DDRB \|= (1<<DDB3);`
37		37
38	`TIMSK \|= (1 << TOIE0); // Enable timer overflow interrupt`	38	`TIMSK \|= (1 << TOIE0); // Enable timer overflow interrupt`
39	`TCCR0B \|= (1 << CS10); // Set up timer`	39	`TCCR0B \|= (1 << CS10); // Set up timer`
40	`sei(); // enable interrupts`	40	`sei(); // enable interrupts`
41		41
42	`while(1)`	42	`while(1)`
43	`{`	43	`{`
44	`if(!DATA) // kdyz je 0 na datech`	44	`if(!DATA) // kdyz je 0 na datech`
45	`{`	45	`{`
46	`POVOLOVAK_HIGH; // zapni vysilani`	46	`POVOLOVAK_HIGH; // zapni vysilani`
47		47
48	`cas = 0xFFFF;`	48	`cas = 0xFFFF;`
49	`bitdelay = 0;`	49	`bitdelay = 0;`
50		50
51	`for (bit=0;bit<=7;bit++) // odpocitej dobu 8mi bitu`	51	`for (bit=0;bit<=7;bit++) // odpocitej dobu 8mi bitu`
52	`{`	52	`{`
53	`last = DATA;`	53	`last = DATA;`
54	`TCNT0 = 0; // vynuluj citac pred tim, ne smazes preteceni, protoze jinak by se mohlo stat, ze se nastavi preteceni driv, nez ma`	54	`TCNT0 = 0; // vynuluj citac pred tim, ne smazes preteceni, protoze jinak by se mohlo stat, ze se nastavi preteceni driv, nez ma`
55	`preteceni = 0;`	55	`preteceni = 0;`
56		56
57	`while ((TCNT0+preteceni*0x0100) <= cas) // bit poznas tak, ze je to nejmensi nalezena delka trvaleho stavu`	57	`while ((TCNT0+preteceni*0x0100) <= cas) // bit poznas tak, ze je to nejmensi nalezena delka trvaleho stavu`
58	`{`	58	`{`
59	`bitdelay=TCNT0+preteceni*0x0100;`	59	`bitdelay=TCNT0+preteceni*0x0100;`
60	`if(DATA != last) // zkontroluj, jestli se nezmenil stav dat.`	60	`if(DATA != last) // zkontroluj, jestli se nezmenil stav dat.`
61	`{`	61	`{`
62	`if (bitdelay < cas) cas = bitdelay; //kdyz se zmenil a trvalo to kratsi dobu nez pred tim poznemenej, jak dlouho to trvalo`	62	`if (bitdelay < cas) cas = bitdelay; //kdyz se zmenil a trvalo to kratsi dobu nez pred tim poznemenej, jak dlouho to trvalo`
63	`break;`	63	`break;`
64	`}`	64	`}`
65	`}`	65	`}`
66	`}`	66	`}`
67	`// while (!DATA); // cekani na stop bit`	67	`while (!DATA); // cekani na stop bit`
68		68
69	`/* for (bit=2;bit >= 0;bit--) // odpocitej dva stopbity`	69	`/* for (bit=2;bit >= 0;bit--) // odpocitej dva stopbity`
70	`{`	70	`{`
71	`TCNT0 = 0; // zacni znova merit cas zacatku stopbitu`	71	`TCNT0 = 0; // zacni znova merit cas zacatku stopbitu`
72	`preteceni=0;`	72	`preteceni=0;`
73		73
74	`while ((TCNT0+preteceni*0x0100) <= cas)`	74	`while ((TCNT0+preteceni*0x0100) <= cas)`
75	`{`	75	`{`
76	`if(!DATA) break;`	76	`if(!DATA) break;`
77	`}`	77	`}`
78	`}*/`	78	`}*/`
79	`}`	79	`}`
80	`else POVOLOVAK_LOW; // kdyz je 1 prepni na prijem`	80	`else POVOLOVAK_LOW; // kdyz je 1 prepni na prijem`
81	`}`	81	`}`
82	`return(0);`	82	`return(0);`
83	`}`	83	`}`

Subversion Repositories svnkaklik

(root)/programy/Atmel_C/RS232toRS485/P232.c – Rev 303 → 304