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[avr-crypto-lib.git] / test_src / setbaud_asm.inc

diff --git a/test_src/setbaud_asm.inc b/test_src/setbaud_asm.inc
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+/*
+    This file is part of the AVR-uart_ni.
+    Copyright (C) 2009 Daniel Otte (daniel.otte@rub.de)
+
+    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 <util/setbaud.h> */
+/* we use a modifyed version of util/setbaud where the UL suffix is removed
+ * since the preprocessor can not handle that.
+ */
+
+#ifndef F_CPU
+#  error "uart_ni requires F_CPU to be defined"
+#endif
+
+#ifndef BAUD
+#  error "uart_ni requires UART0_BAUD_RATE to be defined"
+#endif
+
+#if !(F_CPU)
+#  error "F_CPU must be a constant value"
+#endif
+
+#if !(BAUD)
+#  error "UART0_BAUD_RATE must be a constant value"
+#endif
+
+#undef USE_2X
+
+/* Baud rate tolerance is 2 % unless previously defined */
+#ifndef BAUD_TOL
+#  define BAUD_TOL 2
+#endif
+
+#define UBRR_VALUE (((F_CPU) + 8 * (BAUD)) / (16 * (BAUD)) -1)
+
+#if 100 * (F_CPU) > \
+  (16 * ((UBRR_VALUE) + 1)) * (100 * (BAUD) + (BAUD) * (BAUD_TOL))
+#  define USE_2X 1
+#elif 100 * (F_CPU) < \
+  (16 * ((UBRR_VALUE) + 1)) * (100 * (BAUD) - (BAUD) * (BAUD_TOL))
+#  define USE_2X 1
+#else
+#  define USE_2X 0
+#endif
+
+#if USE_2X
+/* U2X required, recalculate */
+#undef UBRR_VALUE
+#define UBRR_VALUE (((F_CPU) + 4 * (BAUD)) / (8 * (BAUD)) -1)
+
+#if 100 * (F_CPU) > \
+  (8 * ((UBRR_VALUE) + 1)) * (100 * (BAUD) + (BAUD) * (BAUD_TOL))
+#  warning "Baud rate achieved is higher than allowed"
+#endif
+
+#if 100 * (F_CPU) < \
+  (8 * ((UBRR_VALUE) + 1)) * (100 * (BAUD) - (BAUD) * (BAUD_TOL))
+#  warning "Baud rate achieved is lower than allowed"
+#endif
+
+#endif /* USE_U2X */
+
+#ifdef UBRR_VALUE
+#  define UBRRL_VALUE ((UBRR_VALUE) & 0xff)
+#  define UBRRH_VALUE ((UBRR_VALUE) >> 8)
+#endif
+