#ifndef ucoo_hal_i2c_i2c_soft_hh #define ucoo_hal_i2c_i2c_soft_hh // ucoolib - Microcontroller object oriented library. {{{ // // Copyright (C) 2015 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 "ucoo/intf/i2c.hh" #include "ucoo/intf/io.hh" namespace ucoo { /// I2C interface, using IO. class I2cSoft : public I2cMaster { public: /// Constructor. I2cSoft (Io &scl, Io &sda); /// Destructor. ~I2cSoft (); /// Enable and setup. void enable (int speed = 100000); /// Disable. void disable (); /// See I2cMaster::send. void send (uint8_t addr, const char *buf, int count); /// See I2cMaster::recv. void recv (uint8_t addr, char *buf, int count); /// See I2cMaster::send_recv void send_recv (uint8_t addr, const char *send_buf, int send_count, char *recv_buf, int recv_count); /// See I2cMaster::status. int status (); /// See I2cMaster::wait. int wait (); private: /// Wait half a bit period. void delay (); /// Wait until SCL goes high (clock stretching). void wait_scl (); /// Send start condition. void send_start (); /// Send restart condition. void send_restart (); /// Send stop condition. void send_stop (); /// Send one bit. void send_bit (bool bit); /// Receive one bit. bool recv_bit (); /// Send one byte, return nack bit. bool send_byte (char b); /// Receive one byte. char recv_byte (bool nack); private: /// I2C signals. Io &scl_, &sda_; /// Half period. int half_period_ns_; /// Current status. int current_status_; }; } // namespace ucoo #endif // ucoo_hal_i2c_i2c_soft_hh