spi_flash: support working on differnt buses and frequency

components/spi_flash/spi_flash_os_func_noos.c

@@ -0,0 +1,48 @@
+// Copyright 2015-2019 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.
+
+#include <stdarg.h>
+#include "esp_flash.h"
+
+#include "esp32/rom/ets_sys.h"
+#include "esp32/rom/cache.h"
+#include "esp_attr.h"
+
+
+static esp_err_t start(void *arg)
+{
+    Cache_Read_Disable(0);
+    Cache_Read_Disable(1);
+    return ESP_OK;
+}
+static esp_err_t end(void *arg)
+{
+    Cache_Flush(0);
+    Cache_Flush(1);
+    Cache_Read_Enable(0);
+    Cache_Read_Enable(1);
+    return ESP_OK;
+}
+
+static esp_err_t delay_ms(void *arg, unsigned ms)
+{
+    ets_delay_us(1000 * ms);
+    return ESP_OK;
+}
+
+const esp_flash_os_functions_t esp_flash_noos_functions = {
+    .start = start,
+    .end = end,
+    .delay_ms = delay_ms,
+};