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driver(timer_group): fixed bug that init hw_timer caused cresh after system soft reset

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closes https://github.com/espressif/esp-idf/issues/2756
This commit is contained in:
kooho
2018-12-06 19:27:52 +08:00
parent 1607812fef
commit e22c0cce45
2 changed files with 69 additions and 0 deletions
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5
components/driver/timer.c
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@@ -219,6 +219,11 @@ esp_err_t timer_init(timer_group_t group_num, timer_idx_t timer_num, const timer
periph_module_enable(PERIPH_TIMG1_MODULE);
}
TIMER_ENTER_CRITICAL(&timer_spinlock[group_num]);
//Some applications use a software reset, at the reset time, timer_group happens to generate an interrupt.
//but software reset does not clear interrupt status. This is not safe for application when enable the interrupt of timer_group.
//we need to disable the interrupt and clear the interrupt status here.
TG[group_num]->int_ena.val &= (~BIT(timer_num));
TG[group_num]->int_clr_timers.val = BIT(timer_num);
TG[group_num]->hw_timer[timer_num].config.autoreload = config->auto_reload;
TG[group_num]->hw_timer[timer_num].config.divider = (uint16_t) config->divider;
TG[group_num]->hw_timer[timer_num].config.enable = config->counter_en;