AVR-Chat

Can I program my AVR via SPI and use the SPI port on the AVR
immediately afterword?  It seems all should be OK [because when the
programming is done the SS and reset lines are allowed to go high]  It
seems from that point on, that the AVR should be able to run its SPI
software.  Could the SPI interface [going to my PC] be holding signals
after a download?  I've even tried disconnecting the SPI interface
[coming from the PC] and resetting the processor.  Still, I see no
signal on the clock or MOSI lines.

Here is the code I'm using:



include <avr\io.h>

#include <avr\delay.h>

#define DD_MOSI     PINB3
#define DD_SCK     PINB5
#define DDR_SPI    PORTB

char tx_buff[20] = {10,20,30,40,50,60,70,80,90};


void SendBuffer(void)
{

	//char count = 0;
	
	
	for(char index = 0; index<15; index++)
	{
	
		SPI_MasterTransmit(tx_buff[index]);
	
	}

}

void SPI_MasterInit(void)
{
	
	PORTC = 0x20;
	
	// Set MOSI and SCK output, all others input
	DDR_SPI = (1<<DD_MOSI)|(1<<DD_SCK);
	// Enable SPI, Master, set clock rate fck/16
	SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0);
}
void SPI_MasterTransmit(char cData)
{
	
	
	/* Start transmission */
	SPDR = cData;
	/* Wait for transmission complete */
	//PORTC |= 0x10;
	while(!(SPSR & (1<<SPIF)));
	//_delay_ms(5);	
	//PORTC = 0x00;
}
int main(void) 
{	

	
	_delay_ms(10);	
	
	//set port c as all output
	DDRC = 0xff;


	
	SPI_MasterInit();
	_delay_ms(10);	
	
	PORTC |= 0x10;
	//SPI_MasterTransmit('A');
	SendBuffer();
	
	
	PORTC = 0x00;
	
	   while(1) { }
}

Thanks for any inputs.

David