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Add _CPU_Counter_frequency()

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Add rtems_counter_frequency() API function.  Use it to initialize the
counter value converter via the new system initialization step
(RTEMS_SYSINIT_CPU_COUNTER).  This decouples the counter implementation
and the counter converter.  It avoids an unnecessary pull in of the
64-bit integer division from libgcc.

Update #3456.
This commit is contained in:
Sebastian Huber
2018-05-23 14:17:25 +02:00
parent 4c7b18e358
commit 65f868cac6
80 changed files with 293 additions and 86 deletions
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6
bsps/arm/lpc32xx/start/bspstart.c
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@@ -26,6 +26,11 @@
#include <bsp/bootcard.h>
#include <bsp/irq-generic.h>
uint32_t _CPU_Counter_frequency(void)
{
return LPC32XX_PERIPH_CLK;
}
CPU_Counter_ticks _CPU_Counter_read(void)
{
return lpc32xx_timer();
@@ -33,6 +38,5 @@ CPU_Counter_ticks _CPU_Counter_read(void)
void bsp_start(void)
{
rtems_counter_initialize_converter(LPC32XX_PERIPH_CLK);
bsp_interrupt_initialize();
}