SAKURA Internet IoT Communication Module Library for mbed

File content as of revision 13:a9dbb86be232:

/* SAKURA Internet IoT Communication Module Library for mbed
 *
 * The MIT License (MIT)
 *
 * Copyright (c) SAKURA Internet Inc.
 *
 * 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 "mbed.h"
 #include "SakuraIO.h"
 #include "debug.h"

 #define SAKURAIO_SLAVE_ADDR 0x4F

 #define MODE_IDLE 0x00
 #define MODE_WRITE 0x01
 #define MODE_READ 0x02

 void SakuraIO_I2C::begin()
 {
     mode = MODE_IDLE;
 }

 void SakuraIO_I2C::end()
 {
     switch (mode) {
         case MODE_WRITE:
             i2c.stop();
             break;
         case MODE_READ:
             while (_length > 0) {
                 _length--;
                 i2c.read(_length > 0 ? 1 : 0);
             }
             i2c.stop();
             break;
     }

     mode = MODE_IDLE;
 }

 void SakuraIO_I2C::sendByte(uint8_t data)
 {
     if (mode != MODE_WRITE) {
         dbg("beginTr\r\n");
         i2c.start();
         i2c.write(SAKURAIO_SLAVE_ADDR << 1);
         mode = MODE_WRITE;
     }
     dbg("Write=%02x\r\n", data);
     i2c.write(data);
 }

 uint8_t SakuraIO_I2C::startReceive(uint8_t length)
 {
     if (mode != MODE_IDLE) {
         dbg("endTransmission\r\n");
         i2c.stop();
     }
     dbg("requestForm=%d\r\n", length);
     _length = length;
     wait_ms(10);
     i2c.start();
     i2c.write(SAKURAIO_SLAVE_ADDR << 1 | 1);
     mode = MODE_READ;
     return 0;
 }

 uint8_t SakuraIO_I2C::receiveByte()
 {
     return receiveByte(false);
 }

 uint8_t SakuraIO_I2C::receiveByte(bool stop)
 {
     uint8_t ret = 0;
     if (_length > 0) {
         _length--;
         ret = i2c.read(_length > 0 ? 1 : 0);
     }
     if (stop) {
         end();
     }
     dbg("Read=%d\r\n", ret);
     return ret;
 }

 SakuraIO_I2C::SakuraIO_I2C(I2C &_i2c) : i2c(_i2c)
 {
     mode = MODE_IDLE;
 }

 SakuraIO_I2C::SakuraIO_I2C(PinName sda, PinName scl) : i2c_p(new I2C(sda, scl)),
     i2c(*i2c_p)
 {
     mode = MODE_IDLE;
 }