topic I2C using processor expert in Processor Expert Software

I2C using processor expert

dporada — Thu, 06 Aug 2015 14:55:20 GMT

I'm trying to use I2C routines created by processor expert. I am trying to read temperature from an I2C device and when using code similar to the examples and I see the following problem on a scope.

When I transmit the address that I need to read and the program waits for the OnTransmitData interrupt to set a flag. The program sees the OnTransmitData interrupt flag before the Close. The program then continues to try to receive data and I get a "Bus not available" error.

Do I need to insert a delay? None are shown in the sample code.

Thanks for your help.

Re: I2C using processor expert

oleglavrukhin — Thu, 06 Aug 2015 18:02:19 GMT

Hi, Donald!

1) search "I2C" in MCU on Eclipse | Everything on Eclipse, Microcontrollers and Software . It is a better site for Freescale processor expert.

2) or You can try to use this I2c driver, I use it in my KDS (without Kinetis SDK) projects for FRDM-K64F board.

3) and check a pull-up resistors in I2C bus.

Good luck!

Re: I2C using processor expert

Alice_Yang — Tue, 11 Aug 2015 07:43:48 GMT

Hello Donald,

You use which chip , i thin it should have related flag to show the situation of receive and bus .

And which example do you refer to , i will check it on my side .

Hope it helps

Alice

Re: I2C using processor expert

dporada — Tue, 11 Aug 2015 11:43:43 GMT

Alice,

The chip I was talking to was an MCP9804. The example I used was the "Typical Usage" when you select "Help on Component" for the I2C component. I used the receiving data in master mode.

I was able to fix the problem using the CheckBus( ) before using the RecvBlock.

Thanks anyway,

Don