use 74ls164 display led delay

[whung.john]

hi:
today ,my try 74ls164 and connected eight red led.
but i check 74ls164 to pic16f877 pin address.i had correct to display.
i try written a sample program. but every times changed display number ,always lose some value.
can tell me what error ,follow as

#include <16F877.h>
#use delay(clock=10000000)
#fuses NOWDT,HS,NOLVP,BROWNOUT
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#include <LCD>
//74164CLK = PIN_C3 SCK=CLOCK
//74164_DO = PIN_C5 output data
//74164_CLEAR = PIN_C4 cear buffer

void init74164(void)
{
output_low(PIN_C4);
DELAY_MS(100);
output_high(PIN_C3);
output_high(PIN_C5);

setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_4);
lcd_init();
delay_ms(100);
}


void main()
{
unsigned int da;

init74164();
da=0X0f; // here i changed area.
lcd_gotoxy(1,1);printf(lcd_putc,"\ftest=%4u",da);
spi_write(da);
WHILE(1);


}











// TODO: USER CODE!!

[PCM programmer]

The 74LS164 is not the best chip to use, because:

1. It doesn't have an output register. It's just a straight shift register.
Anytime you clock in new data, all the output pins will change state
on each of the 8 cycles of the clock. It's better to use a 74595-type
chip. It has an output register, and also CCS has a driver for it,
called 74595.c.

2. The minimum output voltage is only 2.4v. Some LEDs have a
forward voltage of 3.0v or more. They won't work with a drive
voltage of 2.4v. It's not high enough. For this reason, it's
better to use a chip that puts out CMOS levels. A CMOS chip
(74HCT series) will put out almost 5v for a high level output.
It's possible that your LEDs only have a forward drop of 2.0v.
There are many LEDs like that, so your circuit may work.

Anyway, let's suppose that you still want to use the LS164.

You're trying to use hardware SPI. With SPI, the most important
thing is how to select the correct SPI mode. If you don't use the
correct mode, the device may not operate or it may be flaky.

Here are ckielstra's SPI mode definitions. They use the CCS constants.

[WHUNG.JOHN]

HI :
PROGRAMMER SIR ,glad that question can solve.
the question is leaded from 74164 spi command .
and u ready suggest accuracy.
i modify my program ,now my make sample model can working correct.
thanks.