euint8 if_spiSend(hwInterface *iface, euint8 outgoing)
{
euint8 incoming;
#if ( HW_ENDPOINT_LPC2000_SPINUM == 0 )
SELECT_CARD();
S0SPDR = outgoing;
while( !(S0SPSR & (1<<SPIF)) ) ;
incoming = S0SPDR;
UNSELECT_CARD();
#endif
#if ( HW_ENDPOINT_LPC2000_SPINUM == 1 )
// SELECT_CARD(); // done by hardware
while( !(SSPSR & (1<<TNF)) ) ;
SSPDR = outgoing;
while( !(SSPSR & (1<<RNE)) ) ;
incoming = SSPDR;
// UNSELECT_CARD(); // done by hardware
#endif
return(incoming);
}
void if_spiInit(hwInterface *iface)
{
euint8 i;
// setup GPIO
SPI_IODIR |= (1<<SPI_SCK_PIN)|(1<<SPI_MOSI_PIN)|(1<<SPI_SS_PIN);
SPI_IODIR &= ~(1<<SPI_MISO_PIN);
// set Chip-Select high - unselect card
UNSELECT_CARD();
// reset Pin-Functions
SPI_PINSEL &= ~( (3<<SPI_SCK_FUNCBIT) | (3<<SPI_MISO_FUNCBIT) |
(3<<SPI_MOSI_FUNCBIT) | (3<<SPI_SS_FUNCBIT) );
#if ( HW_ENDPOINT_LPC2000_SPINUM == 0 )
DBG((TXT("spiInit for SPI(0)\n")));
SPI_PINSEL |= ( (1<<SPI_SCK_FUNCBIT) | (1<<SPI_MISO_FUNCBIT) |
(1<<SPI_MOSI_FUNCBIT) );
// enable SPI-Master
S0SPCR = (1<<MSTR)|(0<<CPOL); // TODO: check CPOL
#endif
#if ( HW_ENDPOINT_LPC2000_SPINUM == 1 )
DBG((TXT("spiInit for SSP/SPI1\n")));
// setup Pin-Functions - keep automatic CS disabled during init
SPI_PINSEL |= ( (2<<SPI_SCK_FUNCBIT) | (2<<SPI_MISO_FUNCBIT) |
(2<<SPI_MOSI_FUNCBIT) | (0<<SPI_SS_FUNCBIT) );
// enable SPI-Master - slowest speed
SSPCR0 = ((8-1)<<0) | (0<<CPOL) | (0x20<<SCR); // (0xff<<SCR);
SSPCR1 = (1<<SSE);
#endif
// low speed during init
if_spiSetSpeed(254);
/* Send 20 spi commands with card not selected */
for(i=0;i<21;i++)
my_if_spiSend(iface,0xff);
#if ( HW_ENDPOINT_LPC2000_SPINUM == 0 )
// SPI0 does not offer automatic CS for slaves on LPC2138
// ( the SSEL-Pin is input-only )
// SELECT_CARD();
#endif
#if ( HW_ENDPOINT_LPC2000_SPINUM == 1 )
// enable automatic slave CS for SSP
SSPCR1 &= ~(1<<SSE); // disable interface
SPI_PINSEL |= ( (2<<SPI_SCK_FUNCBIT) | (2<<SPI_MISO_FUNCBIT) |
(2<<SPI_MOSI_FUNCBIT) | (2<<SPI_SS_FUNCBIT) );
SSPCR1 |= (1<<SSE); // enable interface
#endif
}
uint8_t if_spiSend(hwInterface * iface, uint8_t outgoing)
{
euint8 incoming;
SELECT_CARD();
LPC_SPI->SPDR = outgoing;
while (!(LPC_SPI->SPSR & (1 << SPIF)));
incoming = LPC_SPI->SPDR;
UNSELECT_CARD();
return incoming;
}
void if_spiInit(BYTE drive)
{
int i;
printf("spiInit for SPI(0)\n\r");
// Turn on the power
LPC_SC->PCONP |= (1<<8); // PCSPI
// Clock
LPC_SC->PCLKSEL0 &= ~(3<<16); // PCLK_SPI
LPC_SC->PCLKSEL0 |= (1<<16); // PCLK_periph = CCLK
// setup GPIO
LPC_GPIO0->FIODIR |= (1 << SPI_SCK_PIN) | (1 << SPI_MOSI_PIN) | (1 << SPI_SSEL_PIN);
LPC_GPIO0->FIODIR &= ~(1 << SPI_MISO_PIN);
//// reset Pin-Functions
// P0.15 set to SCK
LPC_PINCON->PINSEL0 &= ~SPI_SCK_FUNCMASK;
LPC_PINCON->PINSEL0 |= SPI_SCK_FUNCBIT;
// P0.16, P0.17, P0.18 set to SSEL,MISI, MOSI
SPI_PINSEL &= ~(SPI_MOSI_FUNCMASK | SPI_MISO_FUNCMASK | SPI_SSEL_FUNCMASK);
SPI_PINSEL |= (SPI_MOSI_FUNCBIT | SPI_MISO_FUNCBIT | SPI_SSEL_FUNCBIT);
// enable SPI-Master
LPC_SPI->SPCR = (1 << MSTR) | (0 << CPOL); // TODO: check CPOL
UNSELECT_CARD();
// Code for GPIO setup
/* Switch the SSI TX line to a GPIO and drive it high too. */
// P0.18 back to GPIO
LPC_PINCON->PINSEL1 &= ~(SPI_MOSI_FUNCMASK);
LPC_GPIO0->FIODIR |= (1<<SPI_MOSI_PIN);
LPC_GPIO0->FIOSET = (1<<SPI_MOSI_PIN);
// low speed during init
if_spiSetSpeed(254);
/* Send 20 spi commands with card not selected */
for(i=0;i<21;i++)
my_if_spiSend(file, 0xff);
// P0.18 back to SPI
LPC_PINCON->PINSEL1 |= (SPI_MOSI_FUNCBIT);
}
