components: Expose the RTC source slection API.

Author: Daniel Campora

components/bootloader/src/main/bootloader_start.c

@@ -713,11 +713,9 @@ static void clock_configure(void)
      * part of the start up time by enabling 32k XTAL early.
      * App startup code will wait until the oscillator has started up.
      */
-#ifdef CONFIG_ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL
     if (!rtc_clk_32k_enabled()) {
         rtc_clk_32k_bootstrap();
     }
-#endif
 }
 
 static void uart_console_configure(void)

components/esp32/clk.c

@@ -21,6 +21,7 @@
 #include "soc/soc.h"
 #include "soc/rtc.h"
 #include "soc/rtc_cntl_reg.h"
+#include "esp_clk.h"
 
 /* Number of cycles to wait from the 32k XTAL oscillator to consider it running.
  * Larger values increase startup delay. Smaller values may cause false positive
@@ -29,8 +30,6 @@
 #define XTAL_32K_DETECT_CYCLES  32
 #define SLOW_CLK_CAL_CYCLES     CONFIG_ESP32_RTC_CLK_CAL_CYCLES
 
-static void select_rtc_slow_clk(rtc_slow_freq_t slow_clk);
-
 static const char* TAG = "clk";
 /*
  * This function is not exposed as an API at this point,
@@ -88,7 +87,7 @@ void IRAM_ATTR ets_update_cpu_frequency(uint32_t ticks_per_us)
  */
 static uint32_t s_rtc_slow_clk_cal = 0;
 
-static void select_rtc_slow_clk(rtc_slow_freq_t slow_clk)
+void select_rtc_slow_clk(rtc_slow_freq_t slow_clk)
 {
     if (slow_clk == RTC_SLOW_FREQ_32K_XTAL) {
         /* 32k XTAL oscillator needs to be enabled and running before it can

components/esp32/deep_sleep.c

@@ -17,12 +17,12 @@
 #include "esp_attr.h"
 #include "esp_deep_sleep.h"
 #include "esp_log.h"
-#include "esp_clk.h"
 #include "rom/cache.h"
 #include "rom/rtc.h"
 #include "rom/uart.h"
 #include "soc/cpu.h"
 #include "soc/rtc.h"
+#include "esp_clk.h"
 #include "soc/rtc_cntl_reg.h"
 #include "soc/rtc_io_reg.h"
 #include "soc/sens_reg.h"

components/esp32/include/esp_clk.h

@@ -31,6 +31,7 @@
  */
 void esp_clk_init(void);
 
+void select_rtc_slow_clk(rtc_slow_freq_t slow_clk);
 
 /**
  * @brief Get the cached calibration value of RTC slow clock

components/newlib/time.c

@@ -24,9 +24,9 @@
 #include <rom/rtc.h>
 #include "esp_attr.h"
 #include "esp_intr_alloc.h"
-#include "esp_clk.h"
 #include "soc/soc.h"
 #include "soc/rtc.h"
+#include "esp_clk.h"
 #include "soc/rtc_cntl_reg.h"
 #include "soc/frc_timer_reg.h"
 #include "rom/ets_sys.h"

components/ulp/ulp.c

@@ -19,11 +19,11 @@
 #include "esp_attr.h"
 #include "esp_err.h"
 #include "esp_log.h"
-#include "esp_clk.h"
 #include "esp32/ulp.h"
 
 #include "soc/soc.h"
 #include "soc/rtc.h"
+#include "esp_clk.h"
 #include "soc/rtc_cntl_reg.h"
 #include "soc/sens_reg.h"