CC2642R: CC2642 I2C drive strengh and library rebuild

Mark Watson30

Part Number: CC2642R
Other Parts Discussed in Thread: CC2640, SYSCONFIG

Similar to Ed Hepler's post on the CC2640, I am in need of better drive on the I2C port pins. Unfortunately the I2C_open() function sets them to minimum drive. I have modified the driver code, but since the CC2642 has the drivers in ROM I am unsure of how to move just this one driver to Flash.

in I2CCC26XX.c:

static int I2CCC26XX_initIO(I2C_Handle handle, void *pinCfg) {
I2CCC26XX_Object *object;
I2CCC26XX_HWAttrsV1 const *hwAttrs;
I2CCC26XX_I2CPinCfg i2cPins;

/* Configure I2C pins SDA and SCL*/
i2cPinTable[i++] = i2cPins.pinSDA | PIN_INPUT_EN | PIN_OPENDRAIN | PIN_DRVSTR_MAX;
i2cPinTable[i++] = i2cPins.pinSCL | PIN_INPUT_EN | PIN_OPENDRAIN | PIN_DRVSTR_MAX;
i2cPinTable[i++] = PIN_TERMINATE;
/* Allocate pins*/
object->hPin = PIN_open(&object->pinState, i2cPinTable);

Thanks.

over 5 years ago

0 R.M over 5 years ago

TI__Genius 9215 points

Hi,

What SDK are you using? With SDK 3.30.00.03 you should be able to configure this through SysConfig.

Best Regards,

R.M

0 Mark Watson30 over 5 years ago in reply to R.M

Prodigy 60 points

We are using 3.10.00.53. I will take a look at the new SDK. Thanks.

0 Mark Watson30 over 5 years ago in reply to Mark Watson30

Prodigy 60 points

R.M.

We have looked at the new SDK and the SysConfig tools. It appears the tool allows us to set the I2C pin drive strength when the pin is not is use by the I2C. We need to set to high drive strength when the I2C pin is under control of the I2C module.

Thanks,

Mark

0 R.M over 5 years ago in reply to Mark Watson30

TI__Genius 9215 points

Hi Mark,

This can be solved by including the I2CCC26XX.c file (found under source\ti\drivers\i2c in the SDK) in your project to overrides the ROM functions and then set the pin config you want in the I2CCC26XX_initIO function:

Best Regards,

R.M

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CC2642R: CC2642 I2C drive strengh and library rebuild