Does anyone have a quick and dirty i2c example?

[paulcowper]

Posted on November 22, 2011 at 00:18

Hi all,

I am very new to the STM32, currently using the STM32L.. As I am new to developing on this platform (Never touched anything ARM before), I am overwhelmed by the amount of documentation although trying to dig out the bits that are useful is a little confusing to me right now. While there is lots of information about i2c, it is very application specific (EEPROM etc). Some times I think simple is best. I am wondering if anyone would be able to take the time to help me? I am using the standard lib and using TrueStudio. I would like to see if anyone could create or already has an example of the following: Setting up i2c, Setting the micro as the master, checking the presense of the device at address 0x40 and verifying the ACK and sending data to it, and maybe as a brucie bonus being able to do the same for a second device on the same bus. The actual slave is an IO extender device that I am using to test i2c. Now I could go and read through the documentation again lots of times and try and get the bits I need. I have tried and failed to break bits out of the ST help files. Your efforts are most apreciated :) Many Thanks Paul

[paulcowper]

Posted on November 24, 2011 at 15:32

Hi Robin,

Thank you for that, I shall try moving those about. Many Thanks Paul

[Tesla DeLorean]

Posted on November 24, 2011 at 15:47

    /*!< Configure I2C SCL pin */

    GPIO_InitStructure.GPIO_Pin = GPIO_PinSource6;     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; ..         /*!< Configure I2C SDA pin */     GPIO_InitStructure.GPIO_Pin = GPIO_PinSource7; These don't use GPIO_PinSourceX (an index), but GPIO_Pin_X (a bit field)     /*!< Configure I2C SCL pin */     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; ..         /*!< Configure I2C SDA pin */     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;

[paulcowper]

Posted on November 24, 2011 at 16:00

Hi Clive,

Doh! It just shows how little I know about this platform at the moment, I shall change them over when I get home. Thank you very much all Paul

[paulcowper]

Posted on November 24, 2011 at 19:45

Excellent, i2c is now alive :) Well at least im getting past I2C_EVENT_MASTER_MODE_SELECT.

I am now timing out on I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED. But I will take more of a look into that. Thanks all Cheers Paul

[bekir]

Posted on July 21, 2012 at 07:13

Hi Paul,

I am new at I2C at stm32, Can you send me your latest version of your code?does it contain IT ?