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Export wait_ns to be overridable 

Some targets may not provide zero-wait-state flash performance. Export this function
to be overridable for targets to provide more accurate implementation like locating
'delay_loop_code' in SRAM.
pull/10683/head
Chun-Chieh Li 2019-05-28 16:24:00 +08:00
parent a4738fa9a8
commit e9885feb20
1 changed files with 4 additions and 1 deletions
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5
platform/mbed_wait_api_no_rtos.c
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@ -112,7 +112,10 @@ static const uint16_t delay_loop_code[] = {
/* Take the address of the code, set LSB to indicate Thumb, and cast to void() function pointer */
#define delay_loop ((void(*)()) ((uintptr_t) delay_loop_code | 1))
void wait_ns(unsigned int ns)
/* Some targets may not provide zero-wait-state flash performance. Export this function
* to be overridable for targets to provide more accurate implementation like locating
* 'delay_loop_code' in SRAM. */
MBED_WEAK void wait_ns(unsigned int ns)
{
uint32_t cycles_per_us = SystemCoreClock / 1000000;
// Note that this very calculation, plus call overhead, will take multiple