// ucoolib - Microcontroller object oriented library. {{{ // // Copyright (C) 2013 Nicolas Schodet // // 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 "i2c_slave_data_buffer.hh" #include namespace ucoo { I2cSlaveDataBuffer::I2cSlaveDataBuffer (char *send_buf, int send_size, char *recv_buf, int recv_size) : send_buf_ (send_buf), send_size_ (send_size), send_count_ (0), recv_buf_ (recv_buf), recv_size_ (recv_size), recv_count_ (0) { } void I2cSlaveDataBuffer::update (const char *buf, int count) { int r = std::min (count, send_size_); irq_flags_t flags = irq_lock (); std::copy (buf, buf + r, send_buf_); send_count_ = r; irq_restore (flags); } int I2cSlaveDataBuffer::poll (char *buf, int count) { // Test to avoid superfluous irq lock. This is not a problem if // condition become false before irq is locked. if (recv_count_) { irq_flags_t flags = irq_lock (); int r = std::min (count, recv_count_); recv_count_ = 0; std::copy (recv_buf_, recv_buf_ + r, buf); irq_restore (flags); return r; } else return 0; } int I2cSlaveDataBuffer::to_send (char *buf, int count) { int r = std::min (count, send_count_); std::copy (send_buf_, send_buf_ + r, buf); return r; } void I2cSlaveDataBuffer::to_recv (const char *buf, int count) { int r = std::min (count, recv_size_); std::copy (buf, buf + r, recv_buf_); recv_count_ = r; } } // namespace ucoo