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[MOVED] PIC16F628 | Hi-Tech | Interrupt based UART Problem

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ediamondsrt

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[SOLVED] PIC16F628 | Hi-Tech | Interrupt based UART Problem

Hello,

I am Using PIC16F628A and Hi-Tech Compiler for MPLAB I want to write routine for UART in which i want Receiving interrupt based,
Here is Initialization i have done for UART

Code: 
        TXSTA = 0x24;
	SYNC = 0;
	SPEN = 1;
	TXEN = 1;
	BRGH = 1;
	SPBRG = 129;

	SREN = 0;
	RCIE = 1;		// Interrupt Enable
	CREN = 1;
	GIE = 1;

Transmission works Perfectly and even polling based receiving works fine can anybody give me code for interrupt based routine please.
 
Last edited:

hello ediamondsrt,



Code: 
TXSTA = 0x24;   -----> are you using synchronous mode ???
	SYNC = 0;
	SPEN = 1;
	TXEN = 1;
	BRGH = 1;
	SPBRG = 129;

***** you have to enable Peripheral Interrupt Enable bit****
Code: 
SREN = 0;        
	RCIE = 1;		// Interrupt Enable
	CREN = 1;
	GIE = 1;
i had enclosed interrupt driven UART receiver code .... it may help you 

Code C - [expand]
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//_______________________________________________________________
//                  UART_RX_CODE_16f628a
//________________________________________________________________
 
#include <pic.h>
 
//___________________________________________________
//                  PORT INIT
//___________________________________________________
 
 
#define init_ports() PORTA=0x00,TRISA=0x00,\
                     PORTB=0x00,TRISB=0x02;
//___________________________________________________
//                  UART INIT
//___________________________________________________
 
#define init_uart() SPBRG=0x67,TXEN=0,TXSTA=0x04,\
                    RCSTA=0x90,INTCON=0x40,PIE1=0x20;
 
//BRGH = 1
//SPEN = 1,CREN = 1,
//RCIE = 1,PEIE = 1 -- Peripheral Interrupt Enable bit
//___________________________________________________
//                  GENERAL INIT
//___________________________________________________
 
 
 
bit  Data_Rce_Flag,Err_FERR_flag=0,Err_OERR_flag=0;
        
unsigned char Res_Buff[10],cnt,Err_Buff,Data_Cnt;
 
 
#define   PORTBIT(adr, bit)   ((unsigned)(&adr)*8+(bit))
static bit Ten_Data_Rec_Ind  @   PORTBIT(PORTB, 5);// Pin RB5 will indicate successful data reseve
 
 
//___________________________________________________
//                  Intrrupt Routine 
//___________________________________________________
 
static void interrupt isr(void)
{
    if(RCIF)
    {   
        
        RCIF=0;
        if(FERR)
        {
            Err_Buff=RCREG;
            Err_FERR_flag=1;
        }
        else if(OERR)
        {
            CREN=0;
            CREN=1;
            Err_OERR_flag=1;
        }
        if(!(Err_FERR_flag & Err_OERR_flag))
        {
        
        
                Res_Buff[Data_Cnt]=RCREG;
                Data_Cnt++;
            if(Data_Cnt > 0x0A)
            Data_Rce_Flag =  1;
        }
        Err_FERR_flag=0;
        Err_OERR_flag=0;
    }
}
 
 
 
///________________________________________________________  
//                        DELAY 
//_________________________________________________________
 
void delay(unsigned char cnt)
{
    unsigned long int count=cnt;
    count=count*2;
    while(count--);
}
//_________________________________________________________
//                           MAIN 
//_________________________________________________________
 
void main()
{
init_ports();
init_uart();
GIE=0;
delay(10);
GIE=1;
while(1)
{
    if(Data_Rce_Flag)
    {   
        Data_Rce_Flag=0;
        Ten_Data_Rec_Ind = 1;
        
    }
}   
}


regards
amar
 
Last edited by a moderator:
amar_1 said:
hello ediamondsrt,



Code: 
TXSTA = 0x24;   -----> are you using synchronous mode ???
	SYNC = 0;
	SPEN = 1;
	TXEN = 1;
	BRGH = 1;
	SPBRG = 129;

***** you have to enable Peripheral Interrupt Enable bit****
Code: 
SREN = 0;        
	RCIE = 1;		// Interrupt Enable
	CREN = 1;
	GIE = 1;
i had enclosed interrupt driven UART receiver code .... it may help you 

Code C - [expand]
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//_______________________________________________________________
//                  UART_RX_CODE_16f628a
//________________________________________________________________
 
#include <pic.h>
 
//___________________________________________________
//                  PORT INIT
//___________________________________________________
 
 
#define init_ports() PORTA=0x00,TRISA=0x00,\
                     PORTB=0x00,TRISB=0x02;
//___________________________________________________
//                  UART INIT
//___________________________________________________
 
#define init_uart() SPBRG=0x67,TXEN=0,TXSTA=0x04,\
                    RCSTA=0x90,INTCON=0x40,PIE1=0x20;
 
//BRGH = 1
//SPEN = 1,CREN = 1,
//RCIE = 1,PEIE = 1 -- Peripheral Interrupt Enable bit
//___________________________________________________
//                  GENERAL INIT
//___________________________________________________
 
 
 
bit  Data_Rce_Flag,Err_FERR_flag=0,Err_OERR_flag=0;
        
unsigned char Res_Buff[10],cnt,Err_Buff,Data_Cnt;
 
 
#define   PORTBIT(adr, bit)   ((unsigned)(&adr)*8+(bit))
static bit Ten_Data_Rec_Ind  @   PORTBIT(PORTB, 5);// Pin RB5 will indicate successful data reseve
 
 
//___________________________________________________
//                  Intrrupt Routine 
//___________________________________________________
 
static void interrupt isr(void)
{
    if(RCIF)
    {   
        
        RCIF=0;
        if(FERR)
        {
            Err_Buff=RCREG;
            Err_FERR_flag=1;
        }
        else if(OERR)
        {
            CREN=0;
            CREN=1;
            Err_OERR_flag=1;
        }
        if(!(Err_FERR_flag & Err_OERR_flag))
        {
        
        
                Res_Buff[Data_Cnt]=RCREG;
                Data_Cnt++;
            if(Data_Cnt > 0x0A)
            Data_Rce_Flag =  1;
        }
        Err_FERR_flag=0;
        Err_OERR_flag=0;
    }
}
 
 
 
///________________________________________________________  
//                        DELAY 
//_________________________________________________________
 
void delay(unsigned char cnt)
{
    unsigned long int count=cnt;
    count=count*2;
    while(count--);
}
//_________________________________________________________
//                           MAIN 
//_________________________________________________________
 
void main()
{
init_ports();
init_uart();
GIE=0;
delay(10);
GIE=1;
while(1)
{
    if(Data_Rce_Flag)
    {   
        Data_Rce_Flag=0;
        Ten_Data_Rec_Ind = 1;
        
    }
}   
}


regards
amar
Click to expand...

Hey Amar,

Thanks a lot for the help. I too come to know about that PEIE bit later. Thanks a lot for help.

---------- Post added at 07:33 ---------- Previous post was at 07:24 ----------

My problem is solved Moderator can Change Prefix.
 

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