// ucoolib - Microcontroller object oriented library. {{{ // // Copyright (C) 2013 Nicolas Schodet // // APBTeam: // Web: http://apbteam.org/ // Email: team AT apbteam DOT org // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 2 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. // // }}} #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