Merge branch 'bugfix/fix_timer_freq_error_when_switch_cpu_freq' into 'master'

Fix timer frequency error when switch CPU frequncy

See merge request sdk/ESP8266_RTOS_SDK!416

components/esp8266/lib/VERSION

@@ -1,7 +1,7 @@
 gwen:
     crypto:     8943c89
     espnow:     8943c89
-    core:       f4f0d3d
+    core:       c875f12
     net80211:   ac9e664
     pp:         830c0c8
     pwm:        0181338

components/freertos/port/esp8266/include/freertos/xtensa_timer.h

@@ -111,7 +111,9 @@ Adjust this frequency to taste (it's not real-time anyway!).
 #ifdef XT_XT2000    /* deprecated */
 #define XT_CLOCK_FREQ       16500000    /* 16.5 MHz (XT2000 default) */
 #else
-#define XT_CLOCK_FREQ       80000000
+//#define XT_CLOCK_FREQ       80000000
+#define XT_BOARD
+#define xtbsp_clock_freq_hz() 80000000
 #endif
 #endif /* XT_SIMULATOR */
 

components/freertos/port/esp8266/port.c

@@ -204,6 +204,7 @@ portBASE_TYPE xPortStartScheduler(void)
     _xt_isr_unmask(1 << ETS_SOFT_INUM);
 
     /* Initialize system tick timer interrupt and schedule the first tick. */
+    _xt_tick_divisor_init();
     _xt_tick_timer_init();
 
     vTaskSwitchContext();