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need SPI interface coding in C (for 8051)

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You have ready-for-use example in atmel web site for hardware SPI.

For software SPI, may consider using discrete IO pins as

Code: 
#define uchar	unsigned char

sbit RF_MISO	= P2^3;  //say
sbit RF_MOSI	= P2^2;
sbit RF_SCK	= P2^1;
sbit RF_CSN	= P2^0;
...

void   spiWr(uchar);
uchar spiRd(void);

...

/*
*********************************************************************************************************
* Low level SPI WRITE FUNCTION
*********************************************************************************************************
*/
void spiWr(uchar dat)
{
		/* software SPI, send MSB first */
	static uchar i,c;

	c = dat;
	for(i=0;i<8;i++)
	{
	if((c&0x80)==0x80)
		RF_MOSI = 1;
	else
		RF_MOSI = 0;

	RF_SCK = 1;
	c=c<<1;
	RF_SCK = 0;
	}
}

/*
*********************************************************************************************************
* Low level SPI READ FUNCTION
*********************************************************************************************************
*/
uchar spiRd(void)
{
	/* software SPI read, MSB read first */
	static uchar i, dat;

	for(i=0;i<8;i++)
	{
		dat = dat<<1;
		RF_SCK = 1;
		if(RF_MISO)
			dat = dat+1;
		RF_SCK = 0;
	}
	
	return dat;
}

John
 
Last edited by a moderator:
i need the SPI coding for the C515 controllers of infenion or siemens the basic structure is similar to the 8051 but with enhance periphirals :?:[/b]
 

TechToys's code is useable on C515
 

i know that the SPI is code is standard in all controllers but i need for C515C controller in which factory test register available by using this register without any slave we can check the SPI communication. :cry:
 

hi,

following are the detail of registers

23_1166263831.JPG


following is the register used for the factory testing

1_1166263885.JPG
 

Code: 
       ORL SSCMODE,#$80  ; set LOOPB to 1
       MOV STB,#$5A      ; send $5A to SPI output
Wait:       
       MOV A,SCF         ; SSC Status Register
       JNB A.0,Wait      ; wait until Transfer completed
       MOV A,SRB         ; receive $5A on Receive Buffer Register
 

hi every one;

i want to interface sd card with 8051 in spi mode...
want help in programming in embedded C...
 

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