//::::::::::::::::::::::::::::::::::::::::::::::::::::::
// Инициализация i2c
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
void I2C_Open(u32_t baud)
{
	// set port pins
	PINSEL0 &= ~(3<<PINSEL0_P0_2);
	PINSEL0 |= (PINSEL_FUNC_01<<PINSEL0_P0_2);

	PINSEL0 &= ~(3<<PINSEL0_P0_3);
	PINSEL0 |= (PINSEL_FUNC_01<<PINSEL0_P0_3);

	// initialize the interrupt vector
	VICIntSelect &= ~(1<<VIC_I2C);
	VICVectAddr2 = (u32_t)I2C_Handler;
	VICVectCntl2 = (1<<VIC_CHNL_ENABLE_BIT) | VIC_I2C;
	VICIntEnable |= (1<<VIC_I2C);

	//rate set
	I2SCLH = baud;
	I2SCLL = baud;
}

//::::::::::::::::::::::::::::::::::::::::::::::::::::::
// Прием данных
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
void I2C_Receive(u8_t selector, u8_t bsize)
{
 	// Set I2C bus as active
	i2c.err_cnt = 0;
	i2c.bcnt = 0;
	i2c.flags &= ~(1<<I2C_FLAG_READY);
	i2c.flags &= ~(1<<I2C_FLAG_OP_COMPLETE);
	i2c.err_code = I2C_NO_ERR;

	// Place address and data in Globals to be used by the interrupt
 	i2c.dsel = selector + I2C_RDFLAG;
	i2c.ptr_to_data = (u8_t*)&i2c.buf[I2C_BUF_DATA];
	i2c.bsize = bsize;					// Counter

	I2CONCLR = ((1<<I2CONSET_AA_BIT) | (1<<I2CONSET_SI_BIT) | (1<<I2CONSET_STA_BIT) | (1<<I2CONSET_I2EN_BIT));	// Clear all I2C settings/flags
	I2CONSET = ((1<<I2CONSET_STA_BIT) | (1<<I2CONSET_I2EN_BIT));   												// Enable the I2C interface + Start condition
}
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
// I2C interrupt routine
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
void I2C_Handler(void)__irq
{
	switch(I2STAT)								// Read result code and switch to next action
	{
//---- Start and TRANSMIT conditions -------
case 0x08:
	// A START condition has been transmitted
case 0x10:
	// A repated START condition has been transmitted
	if(i2c.err_cnt < I2C_MAX_ERR)
	{
		I2CONCLR = (1<<I2CONSET_STA_BIT);		//	Clear start bit
		I2DAT = i2c.dsel; 						// Send (Resend) Selector and RW bit
		i2c.err_cnt++;
	}
		else
			{
				i2c.err_code = I2C_ERR;
				i2c.flags |= (1<<I2C_FLAG_READY);// Signal end of I2C activity
			}
	break;

case 0x20:
	// Salve Selector+WR, Not ACK
case 0x48:
	// Slave Selector+RD, Not Ack
	// Предполагается при неготовности при продолжении цикла записи
	// посылается старт заново
	if(i2c.err_cnt < I2C_MAX_ERR)
	{
		I2CONSET = (1<<I2CONSET_STA_BIT);			//	Set start bit
		i2c.err_cnt++;
	}
		else
			{
				i2c.err_code = I2C_ERR;
				i2c.flags |= (1<<I2C_FLAG_READY);	// Signal end of I2C activity
			}
	break;

case 0x18:
	// Slave Selector+WR has been transmitted, ACK
	I2DAT = *(i2c.ptr_to_data + i2c.bcnt);						// Write to TX register  first DATA byte
	i2c.bcnt++;
	i2c.err_cnt = 0;
	break;

case 0x28:
	// Data byte has been transmitted; ACK has been received
	if(i2c.bcnt < i2c.bsize)								// Data sent, Ack
	{
		I2DAT = *(i2c.ptr_to_data + i2c.bcnt);				// Write data to TX register
		i2c.bcnt++;
	}
	else
		{
			I2CONSET = (1<<I2CONSET_STO_BIT);	// Stop condition
			i2c.flags |= (1<<I2C_FLAG_READY);	// Signal end of I2C activity
		}
	i2c.err_cnt = 0;
	break;

case 0x30:
	// Data sent, NOT Ack
	if(i2c.err_cnt < I2C_MAX_ERR)
	{
		I2DAT = *(i2c.ptr_to_data + i2c.bcnt);		// Resent Data
		i2c.err_cnt++;
	}
		else
			{
				i2c.err_code = I2C_ERR;
				i2c.flags |= (1<<I2C_FLAG_READY); 	// Signal end of I2C activity
			}
	break;

//------------------------------------------
case 0x38:
	// Arbitration Lost

	if(i2c.err_cnt < I2C_MAX_ERR)
	{
		I2CONSET = (1<<I2CONSET_STA_BIT);			//	Set start bit
		i2c.err_cnt++;
	}
		else
			{
				i2c.err_code = I2C_ERR;
				i2c.flags |= (1<<I2C_FLAG_READY); 	// Signal end of I2C activity
			}

	break;

//---- RECEIVE conditions ------------------
case 0x40:
	// Slave Selector+RD, ACK
	I2CONSET = (1<<I2CONSET_AA_BIT);			// Enable ACK for data byte
	i2c.err_cnt = 0;
	break;

case 0x50:
	// Data Received, ACK has been returned
	if(i2c.bcnt < i2c.bsize)
	{
		*(i2c.ptr_to_data + i2c.bcnt) = I2DAT;
		i2c.bcnt++;
		I2CONSET = (1<<I2CONSET_AA_BIT);			// Enable ACK for data byte
	}
		else
		{
			I2CONCLR = (1<<I2CONSET_AA_BIT);
			I2CONSET = (1<<I2CONSET_STO_BIT);		// Stop condition
			i2c.flags |= (1<<I2C_FLAG_READY);		// Signal end of I2C activity
		}
	i2c.err_cnt = 0;
	break;

case 0x58:
	// Data Received, Not Ack
	if(i2c.bcnt < i2c.bsize)i2c.err_code = I2C_ERR;
	i2c.flags |= (1<<I2C_FLAG_READY); // Signal end of I2C activity
	break;

default:
	// Unknown code
	if(i2c.err_cnt < I2C_MAX_ERR)
	{

		I2CONSET = (1<<I2CONSET_STA_BIT);			// Resend
		i2c.err_cnt++;
	}
		else
			{
				i2c.err_code = I2C_ERR;
				i2c.flags |= (1<<I2C_FLAG_READY); // Signal end of I2C activity
			}
	}
	I2CONCLR = (1<<I2CONSET_SI_BIT);			// Clear I2C interrupt flag
	VICVectAddr = 0; 							// Clear interrupt

}