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PIC16F630. . C . A1, A2 DIR, STEP. A2 , DIR . 20 MHz.

asm CCS C .

#include <16f630.h>
#case  
#FUSES NOWDT                    
#FUSES NOMCLR                   
#FUSES HS                     
#FUSES PUT                    
#FUSES BROWNOUT 

#use delay(clock = 20 MHz)                                                                                                                         
#use fast_io(C)                                                     
#opt 9  
                                
#define DIR		PIN_A1                                                             
#define CLK		PIN_A2   
#define LED		PIN_A0                                
                                                                          
#zero_ram       
                             
//half step array     
const int steps[256] =    
{                 
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,                                                                                         
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,                                                                                          
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,                                                                                          
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,                                                                                          
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,                                                                                          
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,                                                                                          
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,                                                                                          
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101,
	0b00000100,0b00000110,0b00000010,0b00001010,0b00001000,0b00001001,0b00000001,0b00000101                                                                                             
};                                                         
             
unsigned int8 nowStep = 0;        
                                                                                                                 
#INT_TIMER1                                                     
void LoadDrop_isr()      
{                                                                           
	output_c(0);              
}                                                                                                          
                                                                                                       
#INT_EXT                    
void clk_isr()
{                                    
   //input_state(DIR) ? nowStep++ : nowStep--;                                                 
  	#asm asis              
  	BTFSC  05.1 
  	INCF   nowStep,F         
  	BTFSS  05.1                                                      
  	DECF   nowStep,F    
  	#endasm             
                    
	output_c(steps[nowStep]);
	set_timer1(0);		
}                                       
                                                                                                                                                    
void main()                                                                                                                                  
{                            
	output_a(0);                         
	input_a();  
	        
	set_tris_c(0);                    
	output_c(0);  
	                           
	setup_comparator(NC_NC_NC_NC);                        
	setup_timer_1(T1_INTERNAL | T1_DIV_BY_8);                       
	set_timer1(0);                                                          
	                          
	ext_int_edge(L_TO_H);    
	                                                          
	enable_interrupts(INT_TIMER1);             
	enable_interrupts(INT_EXT);                   
	enable_interrupts(GLOBAL);  
	                                                                    
	unsigned int16 blinkCounter = 0; 
	             
	MAIN_LOOP:                    
	                                  
		 if(!blinkCounter++)              
		 	output_toggle(LED);        
		 	                
	goto MAIN_LOOP;                                                                                                                                                      
}