SerialWireOutput.h

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2017 ARM Limited
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License");
00006  * you may not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  *     http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 
00018 #ifndef MBED_SERIALWIREOUTPUT_H
00019 #define MBED_SERIALWIREOUTPUT_H
00020 
00021 #if defined(DEVICE_ITM)
00022 
00023 #include "hal/itm_api.h"
00024 #include "platform/FileHandle.h"
00025 
00026 namespace mbed {
00027 
00028 class SerialWireOutput : public FileHandle {
00029 
00030 public:
00031 
00032     SerialWireOutput(void)
00033     {
00034         /* Initialize ITM using internal init function. */
00035         mbed_itm_init();
00036     }
00037 
00038     virtual ssize_t write(const void *buffer, size_t size)
00039     {
00040         mbed_itm_send_block(ITM_PORT_SWO, buffer, size);
00041 
00042         return size;
00043     }
00044 
00045     virtual ssize_t read(void *buffer, size_t size)
00046     {
00047         /* Reading is not supported by this file handle */
00048         return -EBADF;
00049     }
00050 
00051     virtual off_t seek(off_t offset, int whence = SEEK_SET)
00052     {
00053         /* Seeking is not support by this file handler */
00054         return -ESPIPE;
00055     }
00056 
00057     virtual off_t size()
00058     {
00059         /* Size is not defined for this file handle */
00060         return -EINVAL;
00061     }
00062 
00063     virtual int isatty()
00064     {
00065         /* File handle is used for terminal output */
00066         return true;
00067     }
00068 
00069     virtual int close()
00070     {
00071         return 0;
00072     }
00073 };
00074 
00075 } // namespace mbed
00076 
00077 #endif // DEVICE_ITM
00078 
00079 #endif // MBED_SERIALWIREOUTPUT_H