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/* SPI DAC AD5300 Driver for OpenPICC
* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
* All bugs added by Henryk Plötz <henryk@ploetzli.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sys/types.h>
#include <lib_AT91SAM7.h>
#include "../openpcd.h"
static const AT91PS_SPI spi = AT91C_BASE_SPI;
void da_comp_carr(u_int8_t position)
{
volatile int i;
while (!(spi->SPI_SR & AT91C_SPI_TDRE)) { }
AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
/* shift four left, since it is an eight-bit value written as 16 bit xfer
bits 15 and 14 are don't care
bits 13 and 12 are mode (0 is normal operation)
bits 11 thru 4 are data
bits 3 thru 0 are don't care
*/
spi->SPI_TDR = position << 4;
while (!(spi->SPI_SR & AT91C_SPI_TDRE)) { }
for (i = 0; i < 0xff; i++) { }
AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
}
void da_init(void)
{
AT91F_SPI_CfgPMC();
AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA,
AT91C_PA13_MOSI | AT91C_PA14_SPCK, 0);
AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
#if 0
AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SPI,
OPENPCD_IRQ_PRIO_SPI,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &spi_irq);
AT91G_AIC_EnableIt(AT9C_BASE_AIC, AT91C_ID_SPI);
#endif
AT91F_SPI_CfgMode(spi, AT91C_SPI_MSTR |
AT91C_SPI_PS_FIXED | AT91C_SPI_MODFDIS);
/* CPOL = 1, NCPHA = 1, CSAAT = 0, BITS = 1000, SCBR = 13 (3.69MHz),
* DLYBS = 6 (125nS), DLYBCT = 0 */
AT91F_SPI_CfgCs(spi, 0, AT91C_SPI_CPOL | AT91C_SPI_BITS_16 |
AT91C_SPI_NCPHA | (13 << 8) | (6 << 16));
AT91F_SPI_Enable(spi);
}
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