1 files changed, 47 insertions, 0 deletions
diff --git a/contrib/firmware/angie/c/include/serial.h b/contrib/firmware/angie/c/include/serial.h
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+++ b/contrib/firmware/angie/c/include/serial.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+/**
+ * This code was taken from the fx2lib project from this link:
+ * https://github.com/djmuhlestein/fx2lib
+ *
+ * Copyright (C) 2009 Ubixum, Inc.
+ **/
+
+/** \file serial.h
+ * defines functions to print to a serial console with SIO0
+ **/
+
+#include "fx2macros.h"
+#include <stdint.h>
+/**
+ * This function inits sio0 to use T2CON (timer 2)
+ * See TRM 14.3.4.1 (Table 14-16)
+ * Certain baud rates have too high an error rate to work.  All baud rates are .16%
+ * except:
+ *
+ *          12MHZ      24MHZ
+ *   \li 57600  -6.99%
+ *   \li 38400  -2.34%     -2.34%
+ *   \li 19200  -2.34%
+ *
+ *   Possible Baud rates:
+ *    \li 2400
+ *    \li 4800
+ *    \li 9600
+ *    \li 19200
+ *    \li 28800
+ *    \li 38400
+ *    \li 57600
+ *
+ *    Any of these rates should work except 57600 at 12mhz.  -2.34% is pushing
+ *    most hardware specs for working.  All rates at 48mhz work at .16%
+ **/
+
+void sio0_init(uint32_t baud_rate) __critical; /* baud_rate max should be 57600 since int=2 bytes */
+
+/**
+ * putchar('\\n') or putchar('\\r') both transmit \\r\\n
+ * Just use one or the other. (This makes terminal echo easy)
+ **/
+int putchar(char c);
+int getchar(void);