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esp32/mphalport: Use esp_timer_get_time instead of gettimeofday.

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It's more efficient and improves accuracy.
This commit is contained in:
Damien George 2018-04-26 20:19:31 +10:00
parent c7818032b1
commit e1fe3abd09
1 changed files with 10 additions and 16 deletions
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26
ports/esp32/mphalport.c
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@ -27,7 +27,6 @@
*/
#include <stdio.h>
#include <sys/time.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
@ -86,35 +85,30 @@ void mp_hal_stdout_tx_strn_cooked(const char *str, uint32_t len) {
}
uint32_t mp_hal_ticks_ms(void) {
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
return esp_timer_get_time() / 1000;
}
uint32_t mp_hal_ticks_us(void) {
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000 + tv.tv_usec;
return esp_timer_get_time();
}
void mp_hal_delay_ms(uint32_t ms) {
struct timeval tv_start;
struct timeval tv_end;
uint64_t us = ms * 1000;
uint64_t dt;
gettimeofday(&tv_start, NULL);
uint64_t t0 = esp_timer_get_time();
for (;;) {
gettimeofday(&tv_end, NULL);
dt = (tv_end.tv_sec - tv_start.tv_sec) * 1000 + (tv_end.tv_usec - tv_start.tv_usec) / 1000;
if (dt + portTICK_PERIOD_MS >= ms) {
// doing a vTaskDelay would take us beyound requested delay time
uint64_t t1 = esp_timer_get_time();
dt = t1 - t0;
if (dt + portTICK_PERIOD_MS * 1000 >= us) {
// doing a vTaskDelay would take us beyond requested delay time
break;
}
MICROPY_EVENT_POLL_HOOK
vTaskDelay(1);
}
if (dt < ms) {
if (dt < us) {
// do the remaining delay accurately
ets_delay_us((ms - dt) * 1000);
mp_hal_delay_us(us - dt);
}
}