fix(esp_hw_support): update LACT clock prescale immediately when APB changes on esp32

components/esp_hw_support/include/esp_private/systimer.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -7,6 +7,24 @@
 #pragma once
 
 #include <stdint.h>
+#include "sdkconfig.h"
+
+#if CONFIG_ESP_TIMER_IMPL_TG0_LAC
+/* Selects which Timer Group peripheral to use */
+#define LACT_MODULE     0
+
+/* Desired number of timer ticks per microsecond.
+ * This value should be small enough so that all possible APB frequencies
+ * could be divided by it without remainder.
+ * On the other hand, the smaller this value is, the longer we need to wait
+ * after setting UPDATE_REG before the timer value can be read.
+ * If LACT_TICKS_PER_US == 1, then we need to wait up to 1 microsecond, which
+ * makes esp_timer_impl_get_time function take too much time.
+ * The value LACT_TICKS_PER_US == 2 allows for most of the APB frequencies, and
+ * allows reading the counter quickly enough.
+ */
+#define LACT_TICKS_PER_US    2
+#endif
 
 // we assign the systimer resources statically
 #define SYSTIMER_COUNTER_ESPTIMER    0 // Counter used by esptimer, to generate the system level wall clock