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Make hal usable in both chibios/nil 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7018 35acf78f-673a-0410-8e92-d51de3d6d3f4
master
utzig 2014-07-08 19:00:10 +00:00
parent 8b24baf454
commit 6e65427959
1 changed files with 17 additions and 11 deletions
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28
os/hal/ports/AVR/hal_lld.h
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@ -63,32 +63,38 @@
/* Derived constants and error checks. */
/*===========================================================================*/
/* Find the most suitable prescaler setting for the desired CH_CFG_ST_FREQUENCY */
#if ((F_CPU / CH_CFG_ST_FREQUENCY) <= AVR_TIMER_COUNTER_MAX)
#ifdef _NIL_
#define CFG_ST_FREQUENCY NIL_CFG_ST_FREQUENCY
#else
#define CFG_ST_FREQUENCY CH_CFG_ST_FREQUENCY
#endif
/* Find the most suitable prescaler setting for the desired CFG_ST_FREQUENCY */
#if ((F_CPU / CFG_ST_FREQUENCY) <= AVR_TIMER_COUNTER_MAX)
#define AVR_TIMER_PRESCALER 1
#define AVR_TIMER_PRESCALER_BITS (0 << CS02) | (0 << CS01) | (1 << CS00); /* CLK */
#elif ((F_CPU / CH_CFG_ST_FREQUENCY / 8) <= AVR_TIMER_COUNTER_MAX)
#elif ((F_CPU / CFG_ST_FREQUENCY / 8) <= AVR_TIMER_COUNTER_MAX)
#define AVR_TIMER_PRESCALER 8
#define AVR_TIMER_PRESCALER_BITS (0 << CS02) | (1 << CS01) | (0 << CS00); /* CLK/8 */
#elif ((F_CPU / CH_CFG_ST_FREQUENCY / 64) <= AVR_TIMER_COUNTER_MAX)
#elif ((F_CPU / CFG_ST_FREQUENCY / 64) <= AVR_TIMER_COUNTER_MAX)
#define AVR_TIMER_PRESCALER 64
#define AVR_TIMER_PRESCALER_BITS (0 << CS02) | (1 << CS01) | (1 << CS00); /* CLK/64 */
#elif ((F_CPU / CH_CFG_ST_FREQUENCY / 256) <= AVR_TIMER_COUNTER_MAX)
#elif ((F_CPU / CFG_ST_FREQUENCY / 256) <= AVR_TIMER_COUNTER_MAX)
#define AVR_TIMER_PRESCALER 256
#define AVR_TIMER_PRESCALER_BITS (1 << CS02) | (0 << CS01) | (0 << CS00); /* CLK/256 */
#elif ((F_CPU / CH_CFG_ST_FREQUENCY / 1024) <= AVR_TIMER_COUNTER_MAX)
#elif ((F_CPU / CFG_ST_FREQUENCY / 1024) <= AVR_TIMER_COUNTER_MAX)
#define AVR_TIMER_PRESCALER 1024
#define AVR_TIMER_PRESCALER_BITS (1 << CS02) | (0 << CS01) | (1 << CS00); /* CLK/1024 */
#else
#error "Frequency too low for timer, please set CH_CFG_ST_FREQUENCY to a higher value"
#error "Frequency too low for timer, please set CFG_ST_FREQUENCY to a higher value"
#endif
#define AVR_TIMER_COUNTER (F_CPU / CH_CFG_ST_FREQUENCY / AVR_TIMER_PRESCALER)
#define AVR_TIMER_COUNTER (F_CPU / CFG_ST_FREQUENCY / AVR_TIMER_PRESCALER)
/* Test if CH_CFG_ST_FREQUENCY can be matched exactly using this timer */
#define F_CPU_ (AVR_TIMER_COUNTER * AVR_TIMER_PRESCALER * CH_CFG_ST_FREQUENCY)
/* Test if CFG_ST_FREQUENCY can be matched exactly using this timer */
#define F_CPU_ (AVR_TIMER_COUNTER * AVR_TIMER_PRESCALER * CFG_ST_FREQUENCY)
#if (F_CPU_ != F_CPU)
#warning "CH_CFG_ST_FREQUENCY cannot be generated exactly using timer"
#warning "CFG_ST_FREQUENCY cannot be generated exactly using timer"
#endif
#undef F_CPU_