TMS320F28055: I have a problem with I2C and SCI.

Can you please post your GPIO initialization code?

Thanks,

Yes, I can.
It's my init code GPIO:

void InitSciaGpio()
{
EALLOW;

/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.
// This will enable the pullups for the specified pins.


GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0; // Enable pull-up for GPIO28 (SCIRXDA)
GpioCtrlRegs.GPAPUD.bit.GPIO29 = 0; // Enable pull-up for GPIO29 (SCITXDA)

/* Set qualification for selected pins to asynch only */
// Inputs are synchronized to SYSCLKOUT by default.
// This will select asynch (no qualification) for the selected pins.


GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3; // Asynch input GPIO28(SCIRXDA)
GpioCtrlRegs.GPAQSEL2.bit.GPIO29 = 3; // Asynch input GPIO29(SCITXDA)

/* Configure SCI-B pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SCI functional pins.

GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 2; // Configure GPIO28 for SCIRXDA operation
GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 2; // Configure GPIO29 for SCITXDA operation

EDIS;
}

void InitI2CGpio(void) {

EALLOW;

/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0; // Enable pull-up for GPIO32 (SDAA)
GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0; // Enable pull-up for GPIO33 (SCLA)

/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3; // Asynch input GPIO32 (SDAA)
GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3; // Asynch input GPIO33 (SCLA)

/* Configure I2C pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be I2C functional pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1; // Configure GPIO32 for SDAA operation
GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1; // Configure GPIO33 for SCLA operation

EDIS;
}

Strange. There should be no interaction between those peripherals, and I don't see any problems with your GPIO setup code. Are you able to use the SCI and I2C by themselves?

Hi.
It's really strange. Separately from each other interfaces work. SCI I use to SFRA and to exchange with another MCU.

The problem could be in the setup code for the peripherals or for the system control. After running the failing code, here are some things you can check:

* In the PCLKCR0 register, make sure that the clocks for both I2C and SCI are enabled.
* In the PLLSTS register, make sure that the MCLKSTS bit is 0.
* In the I2CMDR register, make sure that the IRS bit is 1.
* Make sure the I2CCLKL and I2CCLKH registers have reasonable values, or at least non-zero values.