SerialWireOutput.h

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