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Add delay loop implementation for M0 core.

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This commit is contained in:
Martin Ling
2026-02-06 17:59:25 +00:00
parent afb6d1372f
commit 3ef784b830
1 changed files with 12 additions and 0 deletions
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12
firmware/common/delay.c
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@@ -32,6 +32,7 @@ void delay(uint32_t duration)
void delay_us_at_mhz(uint32_t us, uint32_t mhz)
{
#if defined(LPC43XX_M4)
// The loop below takes 3 cycles per iteration.
uint32_t loop_iterations = (us * mhz) / 3;
asm volatile("start%=:\n"
@@ -39,4 +40,15 @@ void delay_us_at_mhz(uint32_t us, uint32_t mhz)
" bpl start%=\n" // 2 cycles
:
: [ITERATIONS] "r"(loop_iterations));
#elif defined(LPC43XX_M0)
// The loop below takes 4 cycles per iteration.
uint32_t loop_iterations = (us * mhz) / 4;
asm volatile("start%=:\n"
" sub %[ITERATIONS], #1\n" // 1 cycle
" bpl start%=\n" // 3 cycles
:
: [ITERATIONS] "r"(loop_iterations));
#else
#error "No delay loop implementation"
#endif
}