Problems sending data I2C2 AM3352

marco torelli1

Other Parts Discussed in Thread: AM3352

Hi to all,

I have a problem with the I2C2 bus of the Sitara AM3352. For each shipment data is only sent the slave address, but the data is not sent. My application is pooling, without using the interrupt. From my slave receive the ACK bit, but does not mandate any byte from the software. I attach below my simple application.

...

/* Enable clock I2C_2 */
I2C2ModuleClkConfigEn();
/* Setting pin for I2C2 */
PinMuxSetupApp();

...

/* INIT */
/* Put i2c in reset/disabled state */
I2CMasterDisable(SOC_I2C_2_REGS);

I2CSoftReset(SOC_I2C_2_REGS);

/* Disable auto Idle functionality */
I2CAutoIdleDisable(SOC_I2C_2_REGS);

/* Configure i2c bus speed to 100khz */
I2CMasterInitExpClk(SOC_I2C_2_REGS, I2C_SYSTEM_CLOCK, I2C_INTERNAL_CLOCK,
I2C_OUTPUT_CLOCK);
I2CMasterEnable(SOC_I2C_2_REGS);

while(!I2CSystemStatusGet(SOC_I2C_2_REGS));

/* ADDRESSS */

I2CMasterSlaveAddrSet(SOC_I2C_2_REGS, 0xD0);

/* WRITE */
dcount = 3u;
tCount = 0u;
dataToSlave[0]=0xF1;
dataToSlave[1]=0x71;
dataToSlave[2]=0x28;

while(1UL)
{
I2CSetDataCount(SOC_I2C_2_REGS, dcount);

I2CMasterIntClearEx(SOC_I2C_2_REGS, 0x7FF);

I2CMasterControl(SOC_I2C_2_REGS, I2C_CFG_MST_TX);

I2CMasterStart(SOC_I2C_2_REGS);

while(I2CMasterBusBusy(SOC_I2C_2_REGS) == 0);

// while((I2C_INT_TRANSMIT_READY == (I2CMasterIntRawStatus(SOC_I2C_2_REGS)
// & I2C_INT_TRANSMIT_READY)) && dcount--)
// {
// I2CMasterDataPut(SOC_I2C_2_REGS, dataToSlave[tCount++]);
//
// I2CMasterIntClearEx(SOC_I2C_2_REGS, I2C_INT_TRANSMIT_READY);
// }

/* Wait for the Tx register to be empty */
while (0 == I2CMasterIntRawStatusEx(SOC_I2C_2_REGS, I2C_INT_TRANSMIT_READY));

I2CMasterDataPut(SOC_I2C_2_REGS, dataToSlave[tCount++]);

/* Wait for the Tx register to be empty */
while (0 == I2CMasterIntRawStatusEx(SOC_I2C_2_REGS, I2C_INT_TRANSMIT_READY));

I2CMasterStop(SOC_I2C_2_REGS);

while(0 == (I2CMasterIntRawStatus(SOC_I2C_2_REGS) & I2C_INT_STOP_CONDITION));

I2CMasterIntClearEx(SOC_I2C_2_REGS, I2C_INT_STOP_CONDITION);

dcount = 3u;
tCount = 0u;

mLed4Off();
mDelayFunc();

mLed4On();
mDelayFunc();
}

return (EXIT_SUCCESS);
}

Can anyone tell me where am I wrong?

Thanks to all

Marco T

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi Marco,

What software are you using?

0 marco torelli1 over 11 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

I have used the software of the sample project boot. I only changed the I2C bus: in the design of the boot is used I2C_0, I use the I2C_2.

0 Biser Gatchev-XID over 11 years ago in reply to marco torelli1

TI__Guru**** 393215 points

Is this Starterware, Linux or something else?

0 marco torelli1 over 11 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

In the Startware version v2.00.01.01.

0 Biser Gatchev-XID over 11 years ago in reply to marco torelli1

TI__Guru**** 393215 points

There is a dedicated forum for Starterware. I will move this thread there.

0 Anant Pai over 11 years ago

TI__Intellectual 1845 points

Hi Marco,

The STOP condition is generated by controller after the dcount becomes 0.
In the code you have shared you are checking for occurrence of STOP condition when dcount is still more than 1. So the stop condition may not be generated and your code will hang at this line

while(0 == (I2CMasterIntRawStatus(SOC_I2C_2_REGS) & I2C_INT_STOP_CONDITION));

Modify the code suitably so that you generate a STOP condition after all your transmission
is done, or look for the interrupt status of STOP condition after you have transmitted out
everything.

Please refer the I2C polling example code shared in the StarterWare package
in following files for reference.
    "platform/evmAM335x/eeprom.c" EEPROMI2CRead function
    or the bootloader code
    at "bootloader/src/armv7a/am335x/bl_platform.c" SetupI2CTransmit function

Regards
Anant Pai

0 marco torelli1 over 11 years ago in reply to Anant Pai

Prodigy 40 points

Hi Anant,

thanks for your reply, but i have a different problem: when invoke the function I2CMasterDataPut no data is sent. If you see in my code i have copy the same example of Boot but usign this example i have the same problem.

Regards

Marco T

0 Madana Jyothi Kiran over 11 years ago in reply to marco torelli1

TI__Intellectual 870 points

Hi Marco,

Could you please check the pinmux and clock configurations. Is the code hanging at any place.

The following lines are commented from the reference code:

Please try using the same code as in bootloader for your use case.

Regards,

M.Jyothi Kiran

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Problems sending data I2C2 AM3352