DA code to set the comparator threshold

git-svn-id: https://svn.openpcd.org:2342/trunk@312 6dc7ffe9-61d6-0310-9af1-9938baff3ed1

1 files changed, 72 insertions, 0 deletions

diff --git a/openpicc/application/da.c b/openpicc/application/da.c
new file mode 100644
index 0000000..64cee5b
--- /dev/null
+++ b/openpicc/application/da.c
@@ -0,0 +1,72 @@
+/* SPI DAC AD5300 Driver for OpenPICC
+ * (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
+ * All bugs added by Henryk Plötz <henryk@ploetzli.ch> (c) 2006-2007
+ *
+ *  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 "openpicc.h"
+#include "board.h"
+
+#include <sys/types.h>
+#include <lib_AT91SAM7.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);
+	
+	da_comp_carr(DA_BASELINE);
+}