From b194a1b27e5bc119d6a5eee61be30fce68ae59c0 Mon Sep 17 00:00:00 2001 From: gdisirio Date: Sat, 4 Feb 2012 14:40:31 +0000 Subject: [PATCH] git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_2.4.x@3915 35acf78f-673a-0410-8e92-d51de3d6d3f4 --- os/hal/platforms/AVR/serial_lld.h | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/os/hal/platforms/AVR/serial_lld.h b/os/hal/platforms/AVR/serial_lld.h index 40a57753f..434b6ce96 100644 --- a/os/hal/platforms/AVR/serial_lld.h +++ b/os/hal/platforms/AVR/serial_lld.h @@ -113,7 +113,27 @@ typedef struct { * @brief Macro for baud rate computation. * @note Make sure the final baud rate is within tolerance. */ -#define UBRR(b) (((F_CPU / b) >> 4) - 1) +#define UBRR(b) (((F_CPU / b) >> 4) - 1) + +/** + * @brief Macro for baud rate computationwhen U2Xn == 1. + * @note Make sure the final baud rate is within tolerance. + */ +#define UBRR2(b) (((F_CPU / b) >> 3) - 1) + +/** +* @brief Macro for baud rate computation. +* @note Make sure the final baud rate is within tolerance. +* @note This version uses floating point math for greater accuracy. +*/ +#define UBRR_F(b) ((((double) F_CPU / (double) b) / 16.0) - 0.5) + +/** +* @brief Macro for baud rate computation when U2Xn == 1. +* @note Make sure the final baud rate is within tolerance. +* @note This version uses floating point math for greater accuracy. +*/ +#define UBRR2_F(b) ((((double) F_CPU / (double) b) / 8.0) - 0.5) /*===========================================================================*/ /* External declarations. */