CCS/CC2640: I2c with Interrupt

Sumair Qureshi

Part Number: CC2640
Other Parts Discussed in Thread: CC2650

Tool/software: Code Composer Studio

Hi,

I am using interrupt and I2C function (for Accelerometer) together.

Interrupt is working fine, but when I enable I2c function it stops working. I am wondering whats wrong with it.

I am writing some part of code for understanding

/// ************************* I2C Code ************************* ///

#define Board_SDA IOID_9

#define Board_SCL IOID_10

static PIN_Config SBP_configTable[] ={

Board_SCL | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,

PIN_TERMINATE
};

static I2C_Handle SbpI2cHandle;
static I2C_Params SbpI2cParams;

I2C_Params_init(&SbpI2cParams);

SbpI2cHandle = I2C_open(CC2650_I2C0, &SbpI2cParams);
if(!SbpI2cHandle){
//code will come here if i2c is pins are not opened
}

/// ************************* Interrupt Code ************************* ///

#define Button_Input IOID_14

static void buttonHwiFxn(PIN_Handle hPin, PIN_Id pinId){
// set event in SBP task to process outside of hwi context
events |= SBP_BTN_EVT;

// Wake up the application.
Semaphore_post(sem);
}

PIN_registerIntCb(hSbpPins, buttonHwiFxn);

// Configure interrupt
PIN_setConfig(hSbpPins, PIN_BM_IRQ, Button_Input | PIN_IRQ_POSEDGE);

// Enable wakeup
PIN_setConfig(hSbpPins, PINCC26XX_BM_WAKEUP, Button_Input |PINCC26XX_WAKEUP_POSEDGE);

if (events & SBP_BTN_EVT){

events &= ~SBP_BTN_EVT; //clear event

//Blink LED
}

over 7 years ago

0 Gerardo Gomez Martinez over 7 years ago

TI__Expert 5825 points

Hi Sumair,

If you put a breakpoint on your interrupt callback does it no longer get called after you add the I2C?

BR,
Gerardo

0 Sumair Qureshi over 7 years ago in reply to Gerardo Gomez Martinez

Intellectual 400 points

There is a conflict in hspPins and I2C_init function

When I use sequence 1, interrupt works and SPI pins dont intialized and when i use sequence 2 SPI function works but interrupt pin doesnt initialized.

Sequence 1
hSbpPins = PIN_open(&sbpPins, SBP_configTable); //open pins after opening all drivers like i2c uart etc

if(!hSbpPins)
{
//code will come here if button and pins are not opened
}

I2C_Params_init(&SbpI2cParams);

SbpI2cHandle = I2C_open(CC2650_I2C0, &SbpI2cParams);
if(!SbpI2cHandle)
{
//code will come here if i2c is pins are not opened
}

-----------------xxx--------------------

Sequence 2

if(!hSbpPins)
{
//code will come here if button and pins are not opened
}

I2C_Params_init(&SbpI2cParams);

SbpI2cHandle = I2C_open(CC2650_I2C0, &SbpI2cParams);
if(!SbpI2cHandle)
{
//code will come here if i2c is pins are not opened
}

-----------------xxx--------------------

static PIN_Config SBP_configTable[] =
{

Button_Input | PIN_INPUT_EN | PIN_PULLUP | PIN_HYSTERESIS,

Board_SDA | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,

Board_SCL | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,
PIN_TERMINATE
};

0 Gerardo Gomez Martinez over 7 years ago in reply to Sumair Qureshi

TI__Expert 5825 points

Hi Sumair,

The problem seems to be that you have your I2C pins on your SBP_configTable and are calling PIN_open() on these, and therefore this are getting allocated to your application and the driver can no longer acquire them. You need to remove the I2C pins from your SBP_configTable as these will be handled by the driver itself.

Thanks,
Gerardo

0 Sumair Qureshi over 7 years ago in reply to Gerardo Gomez Martinez

Intellectual 400 points

Hello Gerardo,

After posting this I realized the same thing and I removed the I2C pins fro SBP_configTable and it works.

Thanks for your help

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CCS/CC2640: I2c with Interrupt