/**
* @brief Handle I2C1 event interrupt request.
* @param None
* @retval None
*/
void I2C1_EventIRQ_Handler(void)
{
if(I2C_GetBitState(I2C1, I2C_FLAG_SBSEND))
{
/* Send slave address */
I2C_AddressingDevice_7bit(I2C1, I2C2_SLAVE_ADDRESS7, I2C_DIRECTION_TRANSMITTER);
}
else if(I2C_GetBitState(I2C1, I2C_FLAG_ADDSEND))
{
/*Clear ADDSEND bit */
event1 = I2C_GetCurrentState(I2C1);
}
else if(I2C_GetBitState(I2C1, I2C_FLAG_TBE))
{
if(I2C_nBytes>0)
{
/* The master sends a data byte */
I2C_SendData(I2C1,*I2C_WriteBuffer++);
I2C_nBytes--;
}
else
{
/* The master sends a stop condition to I2C bus */
I2C_StopOnBus_Enable(I2C1, ENABLE);
/* Disable the I2C1 interrupt */
I2C_INTConfig(I2C1,I2C_INT_EIE | I2C_INT_EE | I2C_INT_BIE, DISABLE);
}
}
}
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++;
}
void I2C_GetBitState_Timeout(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
{
reset_timout_tic();
while(I2C_GetBitState(I2Cx, I2C_FLAG) && timeout_tic > 0)
{
timeout_tic --;
}
if (timeout_tic == 0) {
reboot_system(SUCCESS);
}
}
void I2C_GPIO_init(void)
{
GPIO_InitPara GPIO_InitStructure;
I2C_InitPara I2C_InitStructure;
/* Enable GPIOB clock */
RCC_AHBPeriphClock_Enable(RCC_AHBPERIPH_GPIOB,ENABLE);
/* Enable BOARD_I2C APB1 clock */
RCC_APB1PeriphClock_Enable(I2C_RCC,ENABLE);
/* BOARD_I2C GPIO ports*/
GPIO_InitStructure.GPIO_Pin = I2C_SCL_GPIO_PIN | I2C_SDA_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ;
GPIO_InitStructure.GPIO_OType = GPIO_OTYPE_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PUPD_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB,I2C_SCL_GPIO_PINSOURCE,GPIO_AF_1);
GPIO_PinAFConfig(GPIOB,I2C_SDA_GPIO_PINSOURCE,GPIO_AF_1);
// In order to not encounter the I2C BUSY jam, Manually Reset the I2C after GPIO set, before I2C configure.
I2C_SoftwareReset_Enable(BOARD_I2C, ENABLE);
I2C_SoftwareReset_Enable(BOARD_I2C, DISABLE);
I2C_InitStructure.I2C_Protocol = I2C_PROTOCOL_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DUTYCYCLE_2;
I2C_InitStructure.I2C_BitRate = I2C_CLK_HZ;
I2C_InitStructure.I2C_AddressingMode = I2C_ADDRESSING_MODE_7BIT;
I2C_InitStructure.I2C_DeviceAddress = I2C_OWN_ADDRESS7;
I2C_Init(BOARD_I2C, &I2C_InitStructure);
I2C_Enable(BOARD_I2C,ENABLE);
/* Enable I2C2 */
I2C_Acknowledge_Enable(BOARD_I2C,DISABLE);
/* The software must wait until I2C Bus is idle */
#ifdef DBG_OLED_BLOCK
while(I2C_GetBitState(BOARD_I2C,I2C_FLAG_I2CBSY));
#else
I2C_GetBitState_Timeout(BOARD_I2C,I2C_FLAG_I2CBSY);
#endif
}
/**
* @brief Handle I2C1 error interrupt request.
* @param None
* @retval None
*/
void I2C1_ErrorIRQ_Handler(void)
{
/* No acknowledge received */
if(I2C_GetBitState(I2C1, I2C_FLAG_AE))
{
I2C_ClearBitState(I2C1, I2C_FLAG_AE);
}
/* SMBus Alert */
if(I2C_GetBitState(I2C1, I2C_FLAG_SMBALTS))
{
I2C_ClearBitState(I2C1, I2C_FLAG_SMBALTS);
}
/* Bus timeout in SMBus mode */
if(I2C_GetBitState(I2C1, I2C_FLAG_SMBTO))
{
I2C_ClearBitState(I2C1, I2C_FLAG_SMBTO);
}
/* Over-run or under-run when SCL stretch is disabled */
if(I2C_GetBitState(I2C1, I2C_FLAG_RXORE))
{
I2C_ClearBitState(I2C1, I2C_FLAG_RXORE);
}
/* Arbitration lost */
if(I2C_GetBitState(I2C1, I2C_FLAG_LOSTARB))
{
I2C_ClearBitState(I2C1, I2C_FLAG_LOSTARB);
}
/* Bus error */
if(I2C_GetBitState(I2C1, I2C_FLAG_BE))
{
I2C_ClearBitState(I2C1, I2C_FLAG_BE);
}
/* CRC value doesn't match */
if(I2C_GetBitState(I2C1, I2C_FLAG_PECE))
{
I2C_ClearBitState(I2C1, I2C_FLAG_PECE);
}
/* Disable the error interrupt */
I2C_INTConfig(I2C1,I2C_INT_EIE | I2C_INT_EE | I2C_INT_BIE, DISABLE);
}
/**
* @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);
}
