Hardware SPI with BoostC weirdness

[futz]

EDIT: Never mind! I thought about it some more and realized I had my clock polarity wrong. Changed it and she works perfect!


I wrote this little function to send a byte out the SPI, copying the way I used to do it in assembler (which worked fine).

void spi_out(unsigned char digit)
{
	unsigned char junk;
	sspbuf=digit;
	while(!sspstat.BF);
	junk=sspbuf;
}

But it doesn't work. The byte in the receiving shift register appears to be shifted by one bit, and of course my 7-seg displays junk. If I remove the sspstat.BF test, it displays correctly, but doesn't work right (hard to explain).

The generated assembly code looks fine:

52:                void spi_out(unsigned char digit)
53:                {
54:                	unsigned char junk;
55:                	sspbuf=digit;
  008A    501F     MOVF 0x1f, W, ACCESS
  008C    6EC9     MOVWF 0xfc9, ACCESS
56:                	while(!sspstat.BF);
  008E    A0C7     BTFSS 0xfc7, 0, ACCESS
  0090    D7FE     BRA 0x8e
57:                	junk=sspbuf;
  0092    50C9     MOVF 0xfc9, W, ACCESS
  0094    6E20     MOVWF 0x20, ACCESS
58:                }
  0096    0012     RETURN 0

Here's the (working) asm code I ported from:

spisend	movwf	SSPBUF
	BANKSEL	SSPSTAT
spiloop	btfss	SSPSTAT,BF
	goto	spiloop
	BANKSEL	SSPBUF
	movf	SSPBUF,W
	return