void IIC_Start(void)
{
/* Send a start condition to I2C bus */
I2C_StartOnBus_Enable(BOARD_I2C,ENABLE);
/* The software must wait until SBSEND bit is set */
#ifdef DBG_OLED_BLOCK
while(!I2C_StateDetect(BOARD_I2C,I2C_PROGRAMMINGMODE_MASTER_SBSEND));
#else
I2C_StateDetect_Timeout(BOARD_I2C,I2C_PROGRAMMINGMODE_MASTER_SBSEND);
#endif
}
void i2c_sendheader(int address)
{
i2ccount = 0;
while (I2C_GetBitState(I2C1, I2C_FLAG_I2CBSY) && I2CTIMEOUTCONDITION)
i2ccount++;
I2C_StartOnBus_Enable(I2C1, ENABLE);
while (!I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_SBSEND && I2CTIMEOUTCONDITION))
i2ccount++;
I2C_GetBitState(I2C1, I2C_FLAG_SBSEND);
I2C_SendData(I2C1, (address << 1));
while (!I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_TRANSMITTER_ADDSEND) && I2CTIMEOUTCONDITION)
i2ccount++;
}
int i2c_readreg(int address, int reg)
{
int data;
i2c_sendheader(address);
I2C_SendData(I2C1, reg);
while (I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_BYTE_TRANSMITTED) == ERROR && I2CTIMEOUTCONDITION)
{
i2ccount++;
}
// restart
I2C_StartOnBus_Enable(I2C1, ENABLE);
while (!I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_SBSEND && I2CTIMEOUTCONDITION))
{
i2ccount++;
}
// send receiveing address
I2C_SendData(I2C1, (address << 1) + 1);
while (!I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_RECEIVER_ADDSEND) && I2CTIMEOUTCONDITION)
{
i2ccount++;
}
// wait for one byte
while (!I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_BYTE_RECEIVED) && I2CTIMEOUTCONDITION)
{
i2ccount++;
}
data = I2C_ReceiveData(I2C1);
I2C_StopOnBus_Enable(I2C1, ENABLE);
// wait for stop
#ifdef WAITFORSTOP
while (I2C1->CTLR1 & 0x0200 && I2CTIMEOUTCONDITION)
i2ccount++;
#endif
if (!I2CTIMEOUTCONDITION)
{
liberror++;
}
return data;
}
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
int i;
RCC_Configuration();
GPIO_Configuration();
I2C_Configuration();
i=0;
/* Enable I2C2 */
I2C_Enable(BOARD_I2C,ENABLE);
/* Enable Acknowledge */
I2C_Acknowledge_Enable(BOARD_I2C,ENABLE);
/* Send a NACK for the next data byte which will be received into the shift register */
I2C_NACKPosition_Enable(BOARD_I2C,I2C_NACKPOSITION_NEXT);
/* Wait until I2C Bus is idle */
while(I2C_GetBitState(BOARD_I2C, I2C_FLAG_I2CBSY));
/* Send a start condition to I2C bus */
I2C_StartOnBus_Enable(BOARD_I2C, ENABLE);
/* Wait until SBSEND bit is set */
while(!I2C_StateDetect(BOARD_I2C, I2C_PROGRAMMINGMODE_MASTER_SBSEND));
/* Send slave address to I2C bus */
I2C_AddressingDevice_7bit(BOARD_I2C, SLAVE_ADDRESS7, I2C_DIRECTION_RECEIVER);
/* Disable ACK before clearing ADDSEND bit */
I2C_Acknowledge_Enable(BOARD_I2C, DISABLE);
/* Wait until ADDSEND bit is set and clear it */
while(!I2C_StateDetect(BOARD_I2C, I2C_PROGRAMMINGMODE_MASTER_RECEIVER_ADDSEND));
/* Wait until the last data byte is received into the shift register */
while(!I2C_GetBitState(BOARD_I2C, I2C_FLAG_BTC));
/* Send a stop condition */
I2C_StopOnBus_Enable(BOARD_I2C, ENABLE);
/* Wait until the reception data register is not empty */
while(!I2C_GetBitState(BOARD_I2C, I2C_FLAG_RBNE));
/* Read a data from I2C_DTR */
BOARD_I2C_Buf_Read[i++]=I2C_ReceiveData(BOARD_I2C);
/* Wait until the reception data register is not empty */
while(!I2C_GetBitState(BOARD_I2C, I2C_FLAG_RBNE));
/* Read a data from I2C_DTR */
BOARD_I2C_Buf_Read[i++]=I2C_ReceiveData(BOARD_I2C);
while(BOARD_I2C->CTLR1&0x0200);
I2C_NACKPosition_Enable(BOARD_I2C,I2C_NACKPOSITION_CURRENT);
/* Enable Acknowledge */
I2C_Acknowledge_Enable(BOARD_I2C, ENABLE);
while(1);
}
int i2c_readdata(int address, int reg, int *data, int size)
{
int index = 0;
int error = 0;
int i2ccount2 = 0;
int byteerror = 0;
i2c_sendheader(address);
I2C_SendData(I2C1, reg);
while (I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_BYTE_TRANSMITTED) == ERROR && I2CTIMEOUTCONDITION)
i2ccount++;
// restart
I2C_StartOnBus_Enable(I2C1, ENABLE);
while (!I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_SBSEND) && I2CTIMEOUTCONDITION)
{
i2ccount++;
}
// read address
I2C_SendData(I2C1, (address << 1) + 1);
I2C_Acknowledge_Enable(I2C1, ENABLE);
while (!I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_RECEIVER_ADDSEND) && I2CTIMEOUTCONDITION)
{
i2ccount++;
}
while (index < size)
{
i2ccount2 = 0;
while (!I2C_StateDetect(I2C1, I2C_PROGRAMMINGMODE_MASTER_BYTE_RECEIVED) && (i2ccount2 < 2048))
{
i2ccount2++;
}
if (i2ccount2 >= 2048)
byteerror = 1;
data[index] = I2C_ReceiveData(I2C1);
index++;
if (index == size - 1)
I2C_Acknowledge_Enable(I2C1, DISABLE);
}
I2C_StopOnBus_Enable(I2C1, ENABLE);
// wait for stop
#ifdef WAITFORSTOP
while (I2C1->CTLR1 & 0x0200 && I2CTIMEOUTCONDITION)
i2ccount++;
#endif
if (!I2CTIMEOUTCONDITION || byteerror)
{
liberror++;
error = 1;
}
I2C_Acknowledge_Enable(I2C1, DISABLE);
return error;
}
