esp32s2beta: Using rtc_wdt API

components/esp32s2beta/panic.c

@@ -470,32 +470,6 @@ static inline void disableAllWdts(void)
     TIMERG1.wdt_wprotect = 0;
 }
 
-static void esp_panic_wdt_start(void)
-{
-    if (REG_GET_BIT(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_EN)) {
-        return;
-    }
-    WRITE_PERI_REG(RTC_CNTL_WDTWPROTECT_REG, RTC_CNTL_WDT_WKEY_VALUE);
-    WRITE_PERI_REG(RTC_CNTL_WDTFEED_REG, 1);
-    REG_SET_FIELD(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_SYS_RESET_LENGTH, 7);
-    REG_SET_FIELD(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_CPU_RESET_LENGTH, 7);
-    REG_SET_FIELD(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_STG0, RTC_WDT_STG_SEL_RESET_SYSTEM);
-    // 64KB of core dump data (stacks of about 30 tasks) will produce ~85KB base64 data.
-    // @ 115200 UART speed it will take more than 6 sec to print them out.
-    WRITE_PERI_REG(RTC_CNTL_WDTCONFIG1_REG, rtc_clk_slow_freq_get_hz() * 7);
-    REG_SET_BIT(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_EN);
-    WRITE_PERI_REG(RTC_CNTL_WDTWPROTECT_REG, 0);
-}
-
-void esp_panic_wdt_stop(void)
-{
-    WRITE_PERI_REG(RTC_CNTL_WDTWPROTECT_REG, RTC_CNTL_WDT_WKEY_VALUE);
-    WRITE_PERI_REG(RTC_CNTL_WDTFEED_REG, 1);
-    REG_SET_FIELD(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_STG0, RTC_WDT_STG_SEL_OFF);
-    REG_CLR_BIT(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_EN);
-    WRITE_PERI_REG(RTC_CNTL_WDTWPROTECT_REG, 0);
-}
-
 #if CONFIG_ESP32S2_PANIC_PRINT_REBOOT || CONFIG_ESP32S2_PANIC_SILENT_REBOOT
 
 static void esp_panic_dig_reset(void) __attribute__((noreturn));
@@ -628,7 +602,18 @@ static __attribute__((noreturn)) void commonErrorHandler(XtExcFrame *frame)
 
     int core_id = xPortGetCoreID();
     // start panic WDT to restart system if we hang in this handler
-    esp_panic_wdt_start();
+    if (!rtc_wdt_is_on()) {
+        rtc_wdt_protect_off();
+        rtc_wdt_disable();
+        rtc_wdt_set_length_of_reset_signal(RTC_WDT_SYS_RESET_SIG, RTC_WDT_LENGTH_3_2us);
+        rtc_wdt_set_length_of_reset_signal(RTC_WDT_CPU_RESET_SIG, RTC_WDT_LENGTH_3_2us);
+        rtc_wdt_set_stage(RTC_WDT_STAGE0, RTC_WDT_STAGE_ACTION_RESET_SYSTEM);
+        // 64KB of core dump data (stacks of about 30 tasks) will produce ~85KB base64 data.
+        // @ 115200 UART speed it will take more than 6 sec to print them out.
+        rtc_wdt_set_time(RTC_WDT_STAGE0, 7000);
+        rtc_wdt_enable();
+        rtc_wdt_protect_on();
+    }
 
     //Feed the watchdogs, so they will give us time to print out debug info
     reconfigureAllWdts();
@@ -653,7 +638,7 @@ static __attribute__((noreturn)) void commonErrorHandler(XtExcFrame *frame)
 
 #if CONFIG_ESP32S2_PANIC_GDBSTUB
     disableAllWdts();
-    esp_panic_wdt_stop();
+    rtc_wdt_disable();
     panicPutStr("Entering gdb stub now.\r\n");
     esp_gdbstub_panic_handler(frame);
 #else
@@ -674,7 +659,7 @@ static __attribute__((noreturn)) void commonErrorHandler(XtExcFrame *frame)
         reconfigureAllWdts();
     }
 #endif /* CONFIG_ESP32_ENABLE_COREDUMP */
-    esp_panic_wdt_stop();
+    rtc_wdt_disable();
 #if CONFIG_ESP32S2_PANIC_PRINT_REBOOT || CONFIG_ESP32S2_PANIC_SILENT_REBOOT
     panicPutStr("Rebooting...\r\n");
     if (frame->exccause != PANIC_RSN_CACHEERR) {

components/esp32s2beta/sleep_modes.c

@@ -34,6 +34,7 @@
 #include "soc/spi_mem_reg.h"
 #include "soc/sens_reg.h"
 #include "soc/dport_reg.h"
+#include "soc/rtc_wdt.h"
 #include "driver/rtc_io.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
@@ -218,27 +219,6 @@ void IRAM_ATTR esp_deep_sleep_start(void)
     }
 }
 
-static void rtc_wdt_enable(int time_ms)
-{
-    WRITE_PERI_REG(RTC_CNTL_WDTWPROTECT_REG, RTC_CNTL_WDT_WKEY_VALUE);
-    WRITE_PERI_REG(RTC_CNTL_WDTFEED_REG, 1);
-    REG_SET_FIELD(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_SYS_RESET_LENGTH, 7);
-    REG_SET_FIELD(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_CPU_RESET_LENGTH, 7);
-    REG_SET_FIELD(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_STG0, RTC_WDT_STG_SEL_RESET_RTC);
-    WRITE_PERI_REG(RTC_CNTL_WDTCONFIG1_REG, rtc_clk_slow_freq_get_hz() * time_ms / 1000);
-    SET_PERI_REG_MASK(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_EN | RTC_CNTL_WDT_PAUSE_IN_SLP);
-    WRITE_PERI_REG(RTC_CNTL_WDTWPROTECT_REG, 0);
-}
-
-static void rtc_wdt_disable(void)
-{
-    WRITE_PERI_REG(RTC_CNTL_WDTWPROTECT_REG, RTC_CNTL_WDT_WKEY_VALUE);
-    WRITE_PERI_REG(RTC_CNTL_WDTFEED_REG, 1);
-    REG_SET_FIELD(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_STG0, RTC_WDT_STG_SEL_OFF);
-    REG_CLR_BIT(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_EN);
-    WRITE_PERI_REG(RTC_CNTL_WDTWPROTECT_REG, 0);
-}
-
 /**
  * Helper function which handles entry to and exit from light sleep
  * Placed into IRAM as flash may need some time to be powered on.
@@ -305,7 +285,17 @@ esp_err_t esp_light_sleep_start(void)
     rtc_vddsdio_config_t vddsdio_config = rtc_vddsdio_get_config();
 
     // Safety net: enable WDT in case exit from light sleep fails
-    rtc_wdt_enable(1000);
+    bool wdt_was_enabled = rtc_wdt_is_on(); // If WDT was enabled in the user code, then do not change it here.
+    if (!wdt_was_enabled) {
+        rtc_wdt_protect_off();
+        rtc_wdt_disable();
+        rtc_wdt_set_length_of_reset_signal(RTC_WDT_SYS_RESET_SIG, RTC_WDT_LENGTH_3_2us);
+        rtc_wdt_set_length_of_reset_signal(RTC_WDT_CPU_RESET_SIG, RTC_WDT_LENGTH_3_2us);
+        rtc_wdt_set_stage(RTC_WDT_STAGE0, RTC_WDT_STAGE_ACTION_RESET_RTC);
+        rtc_wdt_set_time(RTC_WDT_STAGE0, 1000);
+        rtc_wdt_enable();
+        rtc_wdt_protect_on();
+    }
 
     // Enter sleep, then wait for flash to be ready on wakeup
     esp_err_t err = esp_light_sleep_inner(pd_flags,
@@ -331,7 +321,9 @@ esp_err_t esp_light_sleep_start(void)
 
     esp_timer_impl_unlock();
     DPORT_STALL_OTHER_CPU_END();
-    rtc_wdt_disable();
+    if (!wdt_was_enabled) {
+        rtc_wdt_disable();
+    }
     portEXIT_CRITICAL(&light_sleep_lock);
     return err;
 }

components/esp32s2beta/system_api.c

@@ -31,6 +31,7 @@
 #include "soc/timer_group_struct.h"
 #include "soc/cpu.h"
 #include "soc/rtc.h"
+#include "soc/rtc_wdt.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "freertos/xtensa_api.h"
@@ -254,14 +255,14 @@ void IRAM_ATTR esp_restart_noos(void)
     xt_ints_off(0xFFFFFFFF);
 
     // Enable RTC watchdog for 1 second
-    REG_WRITE(RTC_CNTL_WDTWPROTECT_REG, RTC_CNTL_WDT_WKEY_VALUE);
-    REG_WRITE(RTC_CNTL_WDTCONFIG0_REG,
-            RTC_CNTL_WDT_FLASHBOOT_MOD_EN_M |
-            (RTC_WDT_STG_SEL_RESET_SYSTEM << RTC_CNTL_WDT_STG0_S) |
-            (RTC_WDT_STG_SEL_RESET_RTC << RTC_CNTL_WDT_STG1_S) |
-            (1 << RTC_CNTL_WDT_SYS_RESET_LENGTH_S) |
-            (1 << RTC_CNTL_WDT_CPU_RESET_LENGTH_S) );
-    REG_WRITE(RTC_CNTL_WDTCONFIG1_REG, rtc_clk_slow_freq_get_hz() * 1);
+    rtc_wdt_protect_off();
+    rtc_wdt_disable();
+    rtc_wdt_set_stage(RTC_WDT_STAGE0, RTC_WDT_STAGE_ACTION_RESET_RTC);
+    rtc_wdt_set_stage(RTC_WDT_STAGE1, RTC_WDT_STAGE_ACTION_RESET_SYSTEM);
+    rtc_wdt_set_length_of_reset_signal(RTC_WDT_SYS_RESET_SIG, RTC_WDT_LENGTH_200ns);
+    rtc_wdt_set_length_of_reset_signal(RTC_WDT_CPU_RESET_SIG, RTC_WDT_LENGTH_200ns);
+    rtc_wdt_set_time(RTC_WDT_STAGE0, 1000);
+    rtc_wdt_flashboot_mode_enable();
 
     // Reset and stall the other CPU.
     // CPU must be reset before stalling, in case it was running a s32c1i