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-rw-r--r--firmware/microblaze/lib/hal_uart.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/firmware/microblaze/lib/hal_uart.c b/firmware/microblaze/lib/hal_uart.c
new file mode 100644
index 000000000..fe3b7515a
--- /dev/null
+++ b/firmware/microblaze/lib/hal_uart.c
@@ -0,0 +1,86 @@
+/* -*- 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
+
+static char uart_mode = UART_MODE_ONLCR;
+
+void
+hal_uart_set_mode(int mode)
+{
+ uart_mode = mode;
+}
+
+void
+hal_uart_init(void)
+{
+ hal_uart_set_mode(UART_MODE_ONLCR);
+ u->clkdiv = 217; // 230400 bps
+}
+
+void
+hal_uart_putc(int ch)
+{
+ if (ch == '\n')// && (uart_mode == UART_MODE_ONLCR)) //map \n->\r\n if necessary
+ 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')// && (uart_mode == UART_MODE_ONLCR)) //map \n->\r\n if necessary
+ 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;
+}