Shift Register Library for C

[bimalkamal]

Could anybody please give me a shift register(with latch) library / function written in C?

Thank you.

 

[FoxyRick]

Probably - what are you trying to achieve?

what do you want to shift, a port, a byte, a non-fixed-size word? Serial input, parallel load? Input/load from where?

Do you need to just shift, rotate, do you need an overflow/underflow bit output?

 

[papunblg]

Could anybody please give me a shift register(with latch) library / function written in C?

Thank you.

---

Code C - [expand]
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#define shift 8
sbit latch at RB1_bit;
sbit clock at RB0_bit;
sbit data_bit at RB3_bit;
sbit latch_Direction at TRISB1_bit;
sbit clock_Direction at TRISB0_bit;
sbit data_bit_Direction at TRISB3_bit;
 
void send_data(unsigned char temp);
 
void main()
{
unsigned char a;
  latch_Direction=0;
  clock_Direction=0;
  data_bit_Direction=0;
  while(1){
  
  for(a=0;a<255;a++)
   {
   send_data(a);
   Delay_ms(500);
   }
 
          }
}
void send_data(unsigned char temp)
   {
   unsigned char i;
   unsigned char dd;
   latch=0;
   clock=0;
   for(i=0;i<shift;i++){
   dd=temp>>i;
   if(dd&1)
                        data_bit=1;
             else
                        data_bit=0;
   clock=1;
   clock=0;
                       }
   latch=1;
   }

---

See https://www.edaboard.com/blog/1628/

 

[bhattaroshan]

i don't know which shift register you are talking about ... if 8-bit is ok then here i have written a program for 8-bit 74595 shift register

#ifdef F_CPU 
#undef F_CPU
#endif

#define F_CPU 8000000L

#include<avr\io.h>
#include<util\delay.h>

#define SR_DDR DDRC
#define SR_PORT PORTC
#define SR_DS PC0
#define SR_SH PC1
#define SR_ST PC2

void SR_Init()
{
 SR_DDR|=(1<<SR_DS)|(1<<SR_SH)|(1<<SR_ST);
 SR_PORT&=~((1<<SR_DS)|(1<<SR_SH)|(1<<SR_ST));
}

void SR_DataHigh()
{
 SR_PORT|=(1<<SR_DS);
}

void SR_DataLow()
{
 SR_PORT&=~(1<<SR_DS);
}


void SR_Shift()
{
 SR_PORT|=(1<<SR_SH);
 SR_PORT&=~(1<<SR_SH);
}

void SR_Output()
{
 SR_PORT|=(1<<SR_ST);
 SR_PORT&=~(1<<SR_ST);
}

void SR_Send(uint8_t data)
{
  for(uint8_t i=0;i<8;++i)
   {
    if(data & 0x80)
	 SR_DataHigh();
	else
	 SR_DataLow();

	SR_Shift();
	data<<=1;
   }
   SR_Output();
}

int main()
{

 uint8_t a=1;

 SR_Init();

 while(1)
  {
   SR_Send(a);
   _delay_ms(500);
   if(!a) a=1;
   a<<=1;
  }

 return 0;
}

Note: the processor i have used is ATMEGA8

 

[papunblg]

See https://www.edaboard.com/blog/1628/

Every details are given in the link below the code.
Its 74HC595.

 

[bimalkamal]

---

Code C - [expand]
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#define shift 8
sbit latch at RB1_bit;
sbit clock at RB0_bit;
sbit data_bit at RB3_bit;
sbit latch_Direction at TRISB1_bit;
sbit clock_Direction at TRISB0_bit;
sbit data_bit_Direction at TRISB3_bit;
 
void send_data(unsigned char temp);
 
void main()
{
unsigned char a;
  latch_Direction=0;
  clock_Direction=0;
  data_bit_Direction=0;
  while(1){
  
  for(a=0;a<255;a++)
   {
   send_data(a);
   Delay_ms(500);
   }
 
          }
}
void send_data(unsigned char temp)
   {
   unsigned char i;
   unsigned char dd;
   latch=0;
   clock=0;
   for(i=0;i<shift;i++){
   dd=temp>>i;
   if(dd&1)
                        data_bit=1;
             else
                        data_bit=0;
   clock=1;
   clock=0;
                       }
   latch=1;
   }

---

See https://www.edaboard.com/blog/1628/

Will it work in HItech C?

 

[bigdogguru]

Will it work in HItech C?

Not without a few modifications.

You still have not stated the exact device for which you need the C routines.

Is it the 74HC595 or another device?

The following thread covers coding techniques using Hi-Tech C for the 74HC597, 74HC595 and several other shift register variants:

Questions bout shiftregisters (74HC575, 74HC597)


BigDog