SAKURA Internet IoT Beta Communication Module Library for mbed
Dependents: SakuraIO_Standard SakuraIO_FirmwareUpdate
SakuraIO_I2C.cpp
- Committer:
- sakurafan
- Date:
- 2016-11-13
- Revision:
- 0:f3b80b2bdb14
File content as of revision 0:f3b80b2bdb14:
#include "mbed.h" #include "SakuraIO.h" #include "debug.h" #define SAKURAIO_SLAVE_ADDR (0x4F << 1) #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); 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; _i2c.start(); _i2c.write(SAKURAIO_SLAVE_ADDR | 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(); // _i2c.stop(); // mode = MODE_IDLE; } 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(sda, scl) { mode = MODE_IDLE; }