Imported Upstream version 3.2.2

[debian/gnuradio] / usrp2 / firmware / lib / hal_uart.c

diff --git a/usrp2/firmware/lib/hal_uart.c b/usrp2/firmware/lib/hal_uart.c
new file mode 100644 (file)
index 0000000..75b12b4
--- /dev/null
+++ b/usrp2/firmware/lib/hal_uart.c
@@ -0,0 +1,77 @@
+/* -*- c -*- */
+/*
+ * Copyright 2007,2008 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 "hal_uart.h"
+#include "hal_io.h"
+#include "memory_map.h"
+
+// First pass, no interrupts
+
+// Replaced with divisors.py which generates best divisor
+//#define CALC_DIVISOR(rate) (WISHBONE_CLK_RATE / ((rate) * 16))
+
+#define NSPEEDS 6
+#define        MAX_WB_DIV 4
+
+static const uint16_t
+divisor_table[MAX_WB_DIV+1][NSPEEDS] = {
+  {   2,   2,   2,   2,  2,  2},   // 0: can't happen
+  { 651, 326, 163, 109, 54, 27 },  // 1: 100 MHz
+  { 326, 163,  81,  54, 27, 14 },  // 2:  50 MHz
+  { 217, 109,  54,  36, 18,  9 },  // 3:  33.3333 MHz
+  { 163,  81,  41,  27, 14,  7 },  // 4:  25 MHz
+};
+
+#define u uart_regs
+
+void
+hal_uart_init(void)
+{
+  u->clkdiv = 217;  // 230400 bps
+}
+
+void
+hal_uart_putc(int ch)
+{
+  if (ch == '\n')              // FIXME for now map \n -> \r\n
+    hal_uart_putc('\r');
+
+  while (u->txlevel == 0)       // wait for fifo to have space
+    ;
+
+  u->txchar = ch;
+}
+
+void
+hal_uart_putc_nowait(int ch)
+{
+  if (ch == '\n')              // FIXME for now map \n -> \r\n
+    hal_uart_putc('\r');
+
+  if(u->txlevel)   // If fifo has space
+    u->txchar = ch;
+}
+
+int
+hal_uart_getc(void)
+{
+  while ((u->rxlevel) == 0)  // wait for data to be ready
+    ;
+
+  return u->rxchar;
+}