topic Re: I2C write register stuck at i2c_Wait() K60N512 in Kinetis Microcontrollers

I2C write register stuck at i2c_Wait() K60N512

neagoeiulia — Thu, 07 May 2015 16:29:23 GMT

Hello!

I try to use the I2C module to configure a CMOS sensor from a Kinetis K60N512 in an application but it gets stuck after the instruction I2C0_D = u8RegisterAddress; at i2c_Wait();.

It worked a few times, but now it's stopped. Here is my code:

void OV7675WriteRegister(unsigned char u8RegisterAddress, unsigned char u8Data)

{

// send data to slave

IIC_StartTransmission(SlaveID,MWSR);

i2c_Wait();

I2C0_D = u8RegisterAddress;

i2c_Wait(); // here is the problem i don't understand

I2C0_D = u8Data;

i2c_Wait();

i2c_Stop();

Pause();

}

Can anyone tell me what is wrong?

Thanks

Iulia

Re: I2C write register stuck at i2c_Wait() K60N512

Hui_Ma — Fri, 08 May 2015 03:52:00 GMT

Hi,

I would recommend customer to refer Kinetis 100MHz Rev 2 Example Projects, which provides I2C demo (get data from accelerator sensor MMA8451).

I could not find customer in code to check the I2C slave ACK signal, the problem could be the CMOS sensor doesn't ACK the slave address.

Wish it helps.

Have a great day,
Ma Hui

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Re: I2C write register stuck at i2c_Wait() K60N512

neagoeiulia — Fri, 08 May 2015 06:32:44 GMT

Hello Hui_Ma,

You were right about the fact that the sensor didn't reply with the ACK signal because it was burned. My problem was the energy supply.

Thanks!

Iulia