Diff: drivers/SerialWireOutput.h

Revision:

184:08ed48f1de7f

Child:

186:707f6e361f3e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/SerialWireOutput.h	Thu Apr 19 17:12:19 2018 +0100
@@ -0,0 +1,71 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * 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.
+ */
+
+#if defined(DEVICE_ITM)
+
+#include "hal/itm_api.h"
+#include "platform/FileHandle.h"
+
+class SerialWireOutput : public FileHandle {
+public:
+    SerialWireOutput(void)
+    {
+        /* Initialize ITM using internal init function. */
+        mbed_itm_init();
+    }
+
+    virtual ssize_t write(const void *buffer, size_t size)
+    {
+        const unsigned char *buf = static_cast<const unsigned char *>(buffer);
+
+        /* Send buffer one character at a time over the ITM SWO port */
+        for (size_t i = 0; i < size; i++) {
+            mbed_itm_send(ITM_PORT_SWO, buf[i]);
+        }
+        return size;
+    }
+
+    virtual ssize_t read(void *buffer, size_t size)
+    {
+        /* Reading is not supported by this file handle */
+        return -EBADF;
+    }
+
+    virtual off_t seek(off_t offset, int whence = SEEK_SET)
+    {
+        /* Seeking is not support by this file handler */
+        return -ESPIPE;
+    }
+
+    virtual off_t size()
+    {
+        /* Size is not defined for this file handle */
+        return -EINVAL;
+    }
+
+    virtual int isatty()
+    {
+        /* File handle is used for terminal output */
+        return true;
+    }
+
+    virtual int close()
+    {
+        return 0;
+    }
+};
+
+#endif