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esp32/mphalport: Use ets_delay_us for mp_hal_delay_us_fast.

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The system provided one is in ROM and is more accurate.
This commit is contained in:
Damien George 2019-03-12 15:46:44 +11:00
parent fcace26d87
commit 297092a76a
2 changed files with 1 additions and 10 deletions
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9
ports/esp32/mphalport.c
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@ -148,15 +148,6 @@ void mp_hal_delay_us(uint32_t us) {
}
}
// this function could do with improvements (eg use ets_delay_us)
void mp_hal_delay_us_fast(uint32_t us) {
uint32_t delay = ets_get_cpu_frequency() / 19;
while (--us) {
for (volatile uint32_t i = delay; i; --i) {
}
}
}
/*
extern int mp_stream_errno;
int *__errno() {

2
ports/esp32/mphalport.h
View File

@ -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);