void SPIClass::begin()
{
if (!initialized) {
void *pciDev = NULL;
// Get SPI device base address
pciDev = pci_Alloc(0x00, 0x10, 0x01); // PCI SPI configuration space
if(pciDev == NULL) {printf("SPI device don't exist\n"); return;}
SPI_IOaddr = (unsigned)(pci_In16(pciDev, 0x10) & 0xFFFFFFF0L); // get SPI base address
#if defined DEBUG_MODE
printf("SPI base address = %04X\n", SPI_IOaddr);
#endif
pci_Free(pciDev);
WriteCTRR(FULLDUPEX + SPI_MODE0 + RESET);
io_outpb(SPI_IOaddr + 7, FULLDUPEX); // full-dupex
io_outpb(SPI_IOaddr + 7, io_inpb(SPI_IOaddr + 7) & 0xF1 | SPI_MODE0); // set mode
io_outpb(SPI_IOaddr + 0x0b, 0x08); // delay clk between two transfers
//SOURCE clock/(2 * SPI_CLOCK_DIV)
setClockDivider(13); // 100/(2*13) ~= 4MHz
useFIFO();
detachInterrupt();
io_outpb(SPI_IOaddr + 4, 0x01); // set CS = high
// Set SS to high so a connected chip will be "deselected" by default
pinMode(SS, OUTPUT);
digitalWrite(SS, HIGH);
}
initialized++; // reference count
}
void SPIClass::begin() {
void *pciDev = NULL;
// Get SPI device base address
pciDev = pci_Alloc(0x00, 0x10, 0x01); // PCI SPI configuration space
if(pciDev == NULL) {printf("SPI device don't exist\n"); return;}
SPI_IOaddr = (unsigned)(pci_In16(pciDev, 0x10) & 0xFFFFFFF0L); // get SPI base address
#if defined DEBUG_MODE
printf("SPI base address = %04X\n", SPI_IOaddr);
#endif
pci_Free(pciDev);
WriteCTRR(FULLDUPEX + SPI_MODE0 + RESET);
io_outpb(SPI_IOaddr + 7, FULLDUPEX); // full-dupex
io_outpb(SPI_IOaddr + 7, io_inpb(SPI_IOaddr + 7) & 0xF1 | SPI_MODE0); // set mode
io_outpb(SPI_IOaddr + 0x0b, 0x08); // delay clk between two transfers
//SOURCE clock/(2 * SPI_CLOCK_DIV)
setClockDivider(SPI_CLOCK_DIV800); // 125k Hz
useFIFO();
detachInterrupt();
io_outpb(SPI_IOaddr + 4, 0x01); // set CS = high
// Set SS to high so a connected chip will be "deselected" by default
digitalWrite(SS, HIGH);
// When the SS pin is set as OUTPUT, it can be used as
// a general purpose output port (it doesn't influence
// SPI operations).
//pinMode(SS, OUTPUT);
// Warning: if the SS pin ever becomes a LOW INPUT then SPI
// automatically switches to Slave, so the data direction of
// the SS pin MUST be kept as OUTPUT.
//SPCR |= _BV(MSTR);
//SPCR |= _BV(SPE);
// Set direction register for SCK and MOSI pin.
// MISO pin automatically overrides to INPUT.
// By doing this AFTER enabling SPI, we avoid accidentally
// clocking in a single bit since the lines go directly
// from "input" to SPI control.
// http://code.google.com/p/arduino/issues/detail?id=888
//pinMode(SCK, OUTPUT);
//pinMode(MOSI, OUTPUT);
}
