CDCM6208 CAN NOT WRITE ALL REGS FROM I2C INTERFACE, BUT CAN READ

Hello Bovey,

could you please share a write and read sequence?

Please also ensure, that you have 16bit register address. 

regards,

Julian

hi,

first: the MCU is STM32F103RET6.

//the write code:

//u8_addr: device address;

//u16_RegAddr: Register address;

//u16_data: the data need be write.

void I2C1_WriteReg_16bits(uint8_t u8_addr, uint16_t u16_RegAddr, uint16_t u16_data)
{
I2C_GenerateSTART(I2C1,ENABLE);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT)){;}//EV5
I2C_Send7bitAddress(I2C1,u8_addr,I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){;}//EV6
I2C_SendData(I2C1,u16_RegAddr>>8 && 0xff);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)){;}//EV8_2
I2C_SendData(I2C1,u16_RegAddr && 0xff);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)){;}//EV8_2
I2C_SendData(I2C1,u16_data>>8 && 0xff);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)){;}//EV8_2
I2C_SendData(I2C1,u16_data && 0xff);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)){;}//EV8_2
I2C_GenerateSTOP(I2C1,ENABLE);
}

//read code

//u8_addr: device address;

//u16_RegAddr: Register address;

uint16_t I2C1_ReadReg_16bits(uint8_t u8_addr,uint16_t u16_RegAddr)
{
uint16_t u16_Receive_data;
I2C_GenerateSTART(I2C1,ENABLE);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT)){;}//EV5
I2C_Send7bitAddress(I2C1,u8_addr,I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){;}//EV6
I2C_SendData(I2C1,u16_RegAddr>>8&&0xff);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)){;}//EV8_2
I2C_SendData(I2C1,u16_RegAddr);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)){;}//EV8_2

I2C_GenerateSTART(I2C1,ENABLE);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT)){;}//EV5
I2C_Send7bitAddress(I2C1,u8_addr,I2C_Direction_Receiver);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)){;}//EV6
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED)){;}//EV7
u16_Receive_data = I2C_ReceiveData(I2C1) << 8;
I2C_AcknowledgeConfig(I2C1,DISABLE);
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED)){;}//EV7
u16_Receive_data = u16_Receive_data | I2C_ReceiveData(I2C1);
while (!(I2C1->SR1 & I2C_FLAG_BTF)){;}//EV7_3

I2C_GenerateSTOP(I2C1,ENABLE);
I2C_AcknowledgeConfig(I2C1,ENABLE);
return u16_Receive_data;
}