Enter safe mode after panic or brownout

Uses the IDF's reset reason. Does nothing before reset.

Fixes #3389

1 files changed, 8 insertions, 0 deletions

diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index 6222cd290..5a50bda69 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -102,6 +102,14 @@ safe_mode_t port_init(void) {
         return NO_HEAP;
     }
 
+    esp_reset_reason_t reason = esp_reset_reason();
+    if (reason == ESP_RST_BROWNOUT) {
+        return BROWNOUT;
+    }
+    if (reason == ESP_RST_PANIC) {
+        return HARD_CRASH;
+    }
+
     return NO_SAFE_MODE;
 }