Added crash info dump from terminal, based on EspSaveCrash by krzychb

code/espurna/debug.ino

@@ -87,4 +87,132 @@ void debugSend_P(PGM_P format, ...) {
 
 }
 
+// -----------------------------------------------------------------------------
+// Save crash info
+// Taken from krzychb EspSaveCrash
+// https://github.com/krzychb/EspSaveCrash
+// -----------------------------------------------------------------------------
+
+#define SAVE_CRASH_EEPROM_OFFSET    0x0100  // initial address for crash data
+
+/**
+ * Structure of the single crash data set
+ *
+ *  1. Crash time
+ *  2. Restart reason
+ *  3. Exception cause
+ *  4. epc1
+ *  5. epc2
+ *  6. epc3
+ *  7. excvaddr
+ *  8. depc
+ *  9. adress of stack start
+ * 10. adress of stack end
+ * 11. stack trace bytes
+ *     ...
+ */
+#define SAVE_CRASH_CRASH_TIME       0x00  // 4 bytes
+#define SAVE_CRASH_RESTART_REASON   0x04  // 1 byte
+#define SAVE_CRASH_EXCEPTION_CAUSE  0x05  // 1 byte
+#define SAVE_CRASH_EPC1             0x06  // 4 bytes
+#define SAVE_CRASH_EPC2             0x0A  // 4 bytes
+#define SAVE_CRASH_EPC3             0x0E  // 4 bytes
+#define SAVE_CRASH_EXCVADDR         0x12  // 4 bytes
+#define SAVE_CRASH_DEPC             0x16  // 4 bytes
+#define SAVE_CRASH_STACK_START      0x1A  // 4 bytes
+#define SAVE_CRASH_STACK_END        0x1E  // 4 bytes
+#define SAVE_CRASH_STACK_TRACE      0x22  // variable
+
+/**
+ * Save crash information in EEPROM
+ * This function is called automatically if ESP8266 suffers an exception
+ * It should be kept quick / consise to be able to execute before hardware wdt may kick in
+ */
+extern "C" void custom_crash_callback(struct rst_info * rst_info, uint32_t stack_start, uint32_t stack_end ) {
+
+    // This method assumes EEPROM has already been initialized
+    // which is the first thing ESPurna does
+
+    // write crash time to EEPROM
+    uint32_t crash_time = millis();
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_CRASH_TIME, crash_time);
+
+    // write reset info to EEPROM
+    EEPROM.write(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_RESTART_REASON, rst_info->reason);
+    EEPROM.write(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EXCEPTION_CAUSE, rst_info->exccause);
+
+    // write epc1, epc2, epc3, excvaddr and depc to EEPROM
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EPC1, rst_info->epc1);
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EPC2, rst_info->epc2);
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EPC3, rst_info->epc3);
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EXCVADDR, rst_info->excvaddr);
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_DEPC, rst_info->depc);
+
+    // write stack start and end address to EEPROM
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_STACK_START, stack_start);
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_STACK_END, stack_end);
+
+    // write stack trace to EEPROM
+    int16_t current_address = SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_STACK_TRACE;
+    for (uint32_t i = stack_start; i < stack_end; i++) {
+        byte* byteValue = (byte*) i;
+        EEPROM.write(current_address++, *byteValue);
+    }
+
+    EEPROM.commit();
+
+}
+
+/**
+ * Clears crash info
+ */
+void debugClearCrashInfo() {
+    uint32_t crash_time = 0xFFFFFFFF;
+    EEPROM.put(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_CRASH_TIME, crash_time);
+    EEPROM.commit();
+}
+
+/**
+ * Print out crash information that has been previusly saved in EEPROM
+ */
+void debugDumpCrashInfo() {
+
+    uint32_t crash_time;
+    EEPROM.get(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_CRASH_TIME, crash_time);
+    if ((crash_time == 0) || (crash_time == 0xFFFFFFFF)) {
+        DEBUG_MSG_P(PSTR("[DEBUG] No crash info\n"));
+        return;
+    }
+
+    DEBUG_MSG_P(PSTR("[DEBUG] Crash at %ld ms\n"), crash_time);
+    DEBUG_MSG_P(PSTR("[DEBUG] Reason of restart: %d\n"), EEPROM.read(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_RESTART_REASON));
+    DEBUG_MSG_P(PSTR("[DEBUG] Exception cause: %d\n"), EEPROM.read(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EXCEPTION_CAUSE));
+
+    uint32_t epc1, epc2, epc3, excvaddr, depc;
+    EEPROM.get(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EPC1, epc1);
+    EEPROM.get(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EPC2, epc2);
+    EEPROM.get(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EPC3, epc3);
+    EEPROM.get(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_EXCVADDR, excvaddr);
+    EEPROM.get(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_DEPC, depc);
+    DEBUG_MSG_P(PSTR("[DEBUG] epc1=0x%08x epc2=0x%08x epc3=0x%08x excvaddr=0x%08x depc=0x%08x\n"), epc1, epc2, epc3, excvaddr, depc);
+
+    uint32_t stack_start, stack_end;
+    EEPROM.get(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_STACK_START, stack_start);
+    EEPROM.get(SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_STACK_END, stack_end);
+    DEBUG_MSG_P(PSTR("[DEBUG] >>>stack>>>\n[DEBUG] "));
+    int16_t current_address = SAVE_CRASH_EEPROM_OFFSET + SAVE_CRASH_STACK_TRACE;
+    int16_t stack_len = stack_end - stack_start;
+    uint32_t stack_trace;
+    for (int16_t i = 0; i < stack_len; i += 0x10) {
+        DEBUG_MSG_P(PSTR("%08x: "), stack_start + i);
+        for (byte j = 0; j < 4; j++) {
+            EEPROM.get(current_address, stack_trace);
+            DEBUG_MSG_P(PSTR("%08x "), stack_trace);
+            current_address += 4;
+        }
+        DEBUG_MSG_P(PSTR("\n[DEBUG] "));
+    }
+    DEBUG_MSG_P(PSTR("<<<stack<<<\n"));
+
+}
 #endif // DEBUG_SUPPORT

code/espurna/settings.ino

@@ -260,6 +260,13 @@ void settingsSetup() {
         e->response(Embedis::OK);
     });
 
+    #if DEBUG_SUPPORT
+        Embedis::command( F("CRASH"), [](Embedis* e) {
+            debugDumpCrashInfo();
+            e->response(Embedis::OK);
+        });
+    #endif
+
     Embedis::command( F("DUMP.RAW"), [](Embedis* e) {
         for (unsigned int i = 0; i < SPI_FLASH_SEC_SIZE; i++) {
             if (i % 16 == 0) e->stream->printf("\n[%04X] ", i);