unity: separate common and IDF specific functionality

New unity component can be used for testing other applications.
Upstream version of Unity is included as a submodule.
Utilities specific to ESP-IDF unit tests (partitions, leak checking
setup/teardown functions, etc) are kept only in unit-test-app.
Kconfig options are added to allow disabling certain Unity features.

components/unity/unity_port_esp32.c

@@ -0,0 +1,66 @@
+// Copyright 2016-2018 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 <string.h>
+#include "unity.h"
+#include "sdkconfig.h"
+#include "rom/uart.h"
+#include "esp_clk.h"
+#include "soc/cpu.h"
+
+static uint32_t s_test_start, s_test_stop;
+
+void unity_putc(int c)
+{
+    if (c == '\n') {
+        uart_tx_one_char('\r');
+        uart_tx_one_char('\n');
+    } else if (c == '\r') {
+    } else {
+        uart_tx_one_char(c);
+    }
+}
+
+void unity_flush()
+{
+    uart_tx_wait_idle(CONFIG_CONSOLE_UART_NUM);
+}
+
+void unity_gets(char *dst, size_t len)
+{
+    /* UartRxString length argument is uint8_t */
+    if (len >= UINT8_MAX) {
+        len = UINT8_MAX;
+    }
+    /* Flush anything already in the RX buffer */
+    uint8_t ignore;
+    while (uart_rx_one_char(&ignore) == OK) {
+    }
+    /* Read input */
+    UartRxString((uint8_t *) dst, len);
+}
+
+void unity_exec_time_start(void)
+{
+    RSR(CCOUNT, s_test_start);
+}
+
+void unity_exec_time_stop(void)
+{
+    RSR(CCOUNT, s_test_stop);
+}
+
+uint32_t unity_exec_time_get_ms(void)
+{
+    return (s_test_stop - s_test_start) / (esp_clk_cpu_freq() / 1000);
+}