1 files changed, 73 insertions, 0 deletions
diff --git a/firmware/microblaze/lib/lsadc.c b/firmware/microblaze/lib/lsadc.c
new file mode 100644
index 000000000..7983552e7
--- /dev/null
+++ b/firmware/microblaze/lib/lsadc.c
@@ -0,0 +1,73 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "lsadc.h"
+#include "spi.h"
+#include "memory_map.h"
+
+
+// AD9712 or AD7922   1 MS/s, 10-/12-bit ADCs
+
+//#define SPI_SS_DEBUG SPI_SS_RX_DB
+#define SPI_SS_DEBUG 0
+
+
+void 
+lsadc_init(void)
+{
+  // nop
+}
+
+/* 
+ * The ADC's are pipelined.   That is, you have to tell them
+ * which of the two inputs you want one cycle ahead of time.
+ * We could optimize and keep track of which one we used last
+ * time, but for simplicity we'll always tell it which
+ * one we want.  This takes 2 16-bit xfers, one to set the
+ * input and one to read the one we want.
+ */
+
+int
+_lsadc_read(int which_adc, int slave_select)
+{
+  uint32_t r;
+  int channel = which_adc & 0x1;
+
+  // Set CHN and STY equal to channel number.  We don't want "daisy chain mode"
+  uint16_t cmd = (channel << 13) | (channel << 12);
+
+  spi_transact(SPI_TXONLY, slave_select | SPI_SS_DEBUG,
+	       cmd, 16, SPIF_PUSH_RISE | SPIF_LATCH_RISE);
+
+  r = spi_transact(SPI_TXRX, slave_select | SPI_SS_DEBUG,
+		   cmd, 16, SPIF_PUSH_RISE | SPIF_LATCH_RISE);
+
+  return r & 0x0fff;
+}
+
+int
+lsadc_read_rx(int which_adc)
+{
+  return _lsadc_read(which_adc, SPI_SS_RX_ADC);
+}
+
+int
+lsadc_read_tx(int which_adc)
+{
+  return _lsadc_read(which_adc, SPI_SS_TX_ADC);
+}