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Export wait_ns to be overridable #10683

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Merged
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Jun 3, 2019
Merged

Export wait_ns to be overridable #10683

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5 changes: 4 additions & 1 deletion platform/mbed_wait_api_no_rtos.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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
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