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esp8266: Fix ticks_ms to correctly handle wraparound of system counter.

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Fixes issue #4795.
This commit is contained in:
Damien George 2019-05-22 15:05:03 +10:00
parent c4a6d9c631
commit 5357dad52e
3 changed files with 19 additions and 10 deletions
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4
ports/esp8266/esp_mphal.c
View File

@ -120,7 +120,9 @@ void mp_hal_debug_tx_strn_cooked(void *env, const char *str, uint32_t len) {
}
uint32_t mp_hal_ticks_ms(void) {
return ((uint64_t)system_time_high_word << 32 | (uint64_t)system_get_time()) / 1000;
// Compute milliseconds from 64-bit microsecond counter
system_time_update();
return ((uint64_t)system_time_high_word << 32 | (uint64_t)system_time_low_word) / 1000;
}
uint32_t mp_hal_ticks_us(void) {

23
ports/esp8266/ets_alt_task.c
View File

@ -112,22 +112,27 @@ int ets_loop_iter_disable = 0;
int ets_loop_dont_feed_sw_wdt = 0;
// to implement a 64-bit wide microsecond counter
static uint32_t system_time_prev = 0;
uint32_t system_time_low_word = 0;
uint32_t system_time_high_word = 0;
void system_time_update(void) {
// Handle overflow of system microsecond counter
ets_intr_lock();
uint32_t system_time_cur = system_get_time();
if (system_time_cur < system_time_low_word) {
system_time_high_word += 1; // record overflow of low 32-bits
}
system_time_low_word = system_time_cur;
ets_intr_unlock();
}
bool ets_loop_iter(void) {
if (ets_loop_iter_disable) {
return false;
}
// handle overflow of system microsecond counter
ets_intr_lock();
uint32_t system_time_cur = system_get_time();
if (system_time_cur < system_time_prev) {
system_time_high_word += 1; // record overflow of low 32-bits
}
system_time_prev = system_time_cur;
ets_intr_unlock();
// Update 64-bit microsecond counter
system_time_update();
// 6 words before pend_flag_noise_check is a variable that is used by
// the software WDT. A 1.6 second period timer will increment this

2
ports/esp8266/ets_alt_task.h
View File

@ -3,8 +3,10 @@
extern int ets_loop_iter_disable;
extern int ets_loop_dont_feed_sw_wdt;
extern uint32_t system_time_low_word;
extern uint32_t system_time_high_word;
void system_time_update(void);
bool ets_loop_iter(void);
#endif // MICROPY_INCLUDED_ESP8266_ETS_ALT_TASK_H