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authorlaforge <laforge@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>2006-12-18 12:39:36 +0000
committerlaforge <laforge@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>2006-12-18 12:39:36 +0000
commit09a4935f5d8620eb1ef71c5564b5ddae982a5270 (patch)
tree4f7f5dcd979f535fabe22ccdd9ee5b284df60b6c /firmware/src/picc/da.c
parentb7722bed0ca9da50f93d7b32f280ca304f1a76c0 (diff)
add DAC driver that was missed two commits ago
git-svn-id: https://svn.openpcd.org:2342/trunk@285 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
Diffstat (limited to 'firmware/src/picc/da.c')
-rw-r--r--firmware/src/picc/da.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/firmware/src/picc/da.c b/firmware/src/picc/da.c
new file mode 100644
index 0000000..aebb283
--- /dev/null
+++ b/firmware/src/picc/da.c
@@ -0,0 +1,70 @@
+/* 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);
+
+}
personal git repositories of Harald Welte. Your mileage may vary