Do include cache error initialization files

components/esp32/cache_err_int.c

@@ -0,0 +1,57 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/*
+ The cache has an interrupt that can be raised as soon as an access to a cached 
+ region (flash, psram) is done without the cache being enabled. We use that here 
+ to panic the CPU, which from a debugging perspective is better than grabbing bad 
+ data from the bus.
+*/
+
+
+#include "sdkconfig.h"
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include <esp_types.h>
+#include "esp_err.h"
+#include "esp_intr.h"
+#include "esp_attr.h"
+#include "driver/timer.h"
+
+#include "soc/dport_reg.h"
+#include "esp_int_wdt.h"
+
+
+void esp_cache_err_int_init() {
+    ESP_INTR_DISABLE(ETS_CACHEERR_INUM);
+    intr_matrix_set(xPortGetCoreID(), ETS_CACHE_IA_INTR_SOURCE, ETS_CACHEERR_INUM);
+    //We do not register a handler for the interrupt because it is interrupt level 4 which
+    //is not servicable from C. Instead, xtensa_vectors.S has a call to the panic handler for
+    //this interrupt.
+
+    //These (undocumented) settings will enable the ETS_CACHE_IA_INTR_SOURCE behaviour for both PSRAM
+    //as well as flash RAM.
+    SET_PERI_REG_MASK(DPORT_PRO_DCACHE_DBUG0_REG, 0x3F<<DPORT_PRO_CPU_DISABLED_CACHE_IA_S);
+    SET_PERI_REG_MASK(DPORT_CACHE_IA_INT_EN_REG, (0x3F<<22)|(0x3F<<8)|(0x3F<<14)|(0x3F<<0));
+
+    ESP_INTR_ENABLE(ETS_CACHEERR_INUM);
+}
+
+
+

components/esp32/include/esp_cache_err_int.h

@@ -0,0 +1,16 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+void esp_cache_err_int_init();