esp32/mphalport: Use ets_delay_us for mp_hal_delay_us_fast.

The system provided one is in ROM and is more accurate.

1 files changed, 1 insertions, 1 deletions

diff --git a/ports/esp32/mphalport.h b/ports/esp32/mphalport.h
index b82962779..ff39b7aa1 100644
--- a/ports/esp32/mphalport.h
+++ b/ports/esp32/mphalport.h
@@ -47,7 +47,7 @@ __attribute__((always_inline)) static inline uint32_t mp_hal_ticks_cpu(void) {
 }
 
 void mp_hal_delay_us(uint32_t);
-void mp_hal_delay_us_fast(uint32_t);
+#define mp_hal_delay_us_fast(us) ets_delay_us(us)
 void mp_hal_set_interrupt_char(int c);
 uint32_t mp_hal_get_cpu_freq(void);