1 files changed, 121 insertions, 0 deletions
diff --git a/firmware/usrp2/lib/hal_uart.c b/firmware/usrp2/lib/hal_uart.c
new file mode 100644
index 000000000..af60bed6a
--- /dev/null
+++ b/firmware/usrp2/lib/hal_uart.c
@@ -0,0 +1,121 @@
+/* -*- 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 "memory_map.h"
+#include "hal_uart.h"
+#include "hal_io.h"
+#include "mdelay.h"
+
+//just to save you from going insane, note that firmware/FPGA UARTs [0-2] correspond to serial ports [1-3].
+//so in software, we refer to UART_DEBUG as UART0, but it transmits on pin TXD<1>. see the UART assignments in hal_uart.h.
+
+#define NSPEEDS 6
+#define	MAX_WB_DIV 4
+
+//if you're going to recalculate the divisors, it's just uart_clock_rate / baud_rate.
+//uart_clock_rate is 50MHz for USRP2.
+static const uint16_t
+divisor_table[NSPEEDS] = {
+  5208,	//    9600
+  2604,	//   19200
+  1302,	//   38400
+  868,	//   57600
+  434,	//  115200
+  217	//  230400
+};
+
+static char uart_mode[4] = {
+  [UART_DEBUG] = UART_MODE_ONLCR, 
+  [UART_EXP] = UART_MODE_ONLCR, 
+  [UART_GPS] = UART_MODE_ONLCR
+};
+
+static char uart_speeds[4] = {
+  [UART_DEBUG] = US_230400,
+  [UART_EXP] = US_230400,
+  [UART_GPS] = US_115200
+};
+
+void
+hal_uart_set_mode(hal_uart_name_t uart, int mode)
+{
+  uart_mode[uart] = mode;
+}
+
+void hal_uart_set_speed(hal_uart_name_t uart, hal_uart_speed_t speed)
+{
+  uart_regs[uart].clkdiv = divisor_table[speed];
+}
+
+void
+hal_uart_init(void)
+{
+  for(int i = 0; i < 3; i++) {
+  	hal_uart_set_mode(i, uart_mode[i]);
+    hal_uart_set_speed(i, uart_speeds[i]);
+  }
+}
+
+void
+hal_uart_putc(hal_uart_name_t u, int ch)
+{
+  if ((ch == '\n') && (uart_mode[u] == UART_MODE_ONLCR))		//map \n->\r\n if necessary
+    hal_uart_putc(u, '\r');
+
+  while (uart_regs[u].txlevel == 0)	 // wait for fifo to have space
+    ;
+
+  uart_regs[u].txchar = ch;
+}
+
+void
+hal_uart_putc_nowait(hal_uart_name_t u, int ch)
+{
+  if ((ch == '\n') && (uart_mode[u] == UART_MODE_ONLCR))		//map \n->\r\n if necessary
+    hal_uart_putc(u, '\r');
+
+  if(uart_regs[u].txlevel)   // If fifo has space
+    uart_regs[u].txchar = ch;
+}
+
+int
+hal_uart_getc(hal_uart_name_t u)
+{
+  while ((uart_regs[u].rxlevel) == 0)  // wait for data to be ready
+    ;
+
+  return uart_regs[u].rxchar;
+}
+
+int 
+hal_uart_getc_noblock(hal_uart_name_t u)
+{
+//  int timeout = 0;
+//  while (((uart_regs[u].rxlevel) == 0) && (timeout++ < HAL_UART_TIMEOUT_MS))
+//    mdelay(1);
+  if(uart_regs[u].rxlevel == 0) return -1;
+  return uart_regs[u].rxchar;
+}
+
+int hal_uart_rx_flush(hal_uart_name_t u)
+{
+  char x = 0;
+  while(uart_regs[u].rxlevel) x = uart_regs[u].rxchar;
+  return x;
+}
+