![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
Catie fork
Dependencies: SDFileSystem X_NUCLEO_IKS01A1
Fork of ATT_AWS_IoT_demo by
WNCInterface/WncControllerK64F/MODSERIAL/RESIZE.cpp
- Committer:
- peyo
- Date:
- 2017-04-05
- Revision:
- 29:537df716ba0b
- Parent:
- 15:6f2798e45099
File content as of revision 29:537df716ba0b:
/* Copyright (c) 2010 Andy Kirkham Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "MODSERIAL.h" #include "MACROS.h" namespace AjK { int MODSERIAL::resizeBuffer(int size, IrqType type, bool memory_check) { // Make sure the ISR cannot use the buffers while we are manipulating them. NVIC_DisableIRQ(_IRQ); // If the requested size is the same as the current size there's nothing to do, // just continue to use the same buffer as it's fine as it is. if (buffer_size[type] == size) { NVIC_EnableIRQ(_IRQ); return Ok; } // is new buffer is big enough? if (size <= buffer_count[type]) { NVIC_EnableIRQ(_IRQ); return BufferOversize; } // allocate new buffer char * newBuffer = (char*)malloc(size); // allocation failed? if (newBuffer == (char*)NULL) { if (memory_check) error("Failed to allocate memory for %s buffer", type == TxIrq ? "TX" : "RX"); return NoMemory; } // copy old buffer content to new one moveRingBuffer(newBuffer, type); // free old buffer and reset ring buffer cursor free((char*)buffer[type]); buffer[type] = newBuffer; buffer_size[type] = size; buffer_in[type] = buffer_count[type]; buffer_out[type] = 0; // Start the ISR system again with the new buffers. NVIC_EnableIRQ(_IRQ); return Ok; } void MODSERIAL::moveRingBuffer(char * newBuffer, IrqType type) { // copy old buffer content to new one if(buffer_in[type] > buffer_out[type]) { // content in the middle of the ring buffer memcpy(&newBuffer[0], (char*)&buffer[type][buffer_out[type]], buffer_count[type]); } else if(buffer_in[type] < buffer_out[type]) { // content split, free space in the middle // copy last part of the old buffer int end_count= buffer_size[type] - buffer_out[type]; memcpy(&newBuffer[0], (char*)&buffer[type][buffer_out[type]], end_count); // copy first part of old buffer memcpy(&newBuffer[end_count], (char*)buffer[type], buffer_in[type]); } // else old buffer empty } }; // namespace AjK ends