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git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_2.4.x@3915 35acf78f-673a-0410-8e92-d51de3d6d3f4

This commit is contained in:
gdisirio 2012-02-04 14:40:31 +00:00
parent fadbc663b7
commit b194a1b27e
1 changed files with 21 additions and 1 deletions
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22
os/hal/platforms/AVR/serial_lld.h
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@ -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. */