ulp: added support to building code for riscv ULP coprocessor

components/ulp/test/ulp_riscv/test_main.c

@@ -0,0 +1,70 @@
+// Copyright 2010-2020 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 <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include "ulp_riscv/ulp_riscv.h"
+#include "ulp_riscv/ulp_riscv_utils.h"
+
+typedef enum{
+    RISCV_READ_WRITE_TEST = 1,
+    RISCV_DEEP_SLEEP_WAKEUP_TEST,
+    RISCV_LIGHT_SLEEP_WAKEUP_TEST,
+    RISCV_NO_COMMAND,
+} riscv_test_commands_t;
+
+typedef enum {
+    RISCV_COMMAND_OK = 1,
+    RISCV_COMMAND_NOK,
+    RISCV_COMMAND_INVALID,
+} riscv_test_command_reply_t;
+
+#define XOR_MASK 0xDEADBEEF
+
+volatile riscv_test_commands_t main_cpu_command = RISCV_NO_COMMAND;
+volatile riscv_test_command_reply_t main_cpu_reply = RISCV_COMMAND_INVALID;
+volatile uint32_t riscv_test_data_in = 0;
+volatile uint32_t riscv_test_data_out = 0;
+
+void handle_commands(riscv_test_commands_t cmd) 
+{
+    switch (cmd) {
+        case RISCV_READ_WRITE_TEST:
+            riscv_test_data_out =riscv_test_data_in ^ XOR_MASK;
+            main_cpu_reply =  RISCV_COMMAND_OK;
+            break;
+
+        case RISCV_DEEP_SLEEP_WAKEUP_TEST:
+        case RISCV_LIGHT_SLEEP_WAKEUP_TEST:
+            main_cpu_reply = RISCV_COMMAND_OK;
+            break;
+
+        default:
+            main_cpu_reply = RISCV_COMMAND_NOK;
+            break;
+    }
+    ulp_riscv_wakeup_main_processor();
+}
+
+int main (void)
+{
+    while (1) {
+        handle_commands(main_cpu_command);
+        break;
+    }
+
+    /* ulp_riscv_shutdown() is called automatically when main exits */
+    return 0;
+}