RTOS/TI-RTOS: AMIC110 I2C transfer issue

Frank Brütting

Part Number: TI-RTOS

Tool/software: TI-RTOS

PDK 1.0.9

When the Sitara is I²C master and an I²C device can’t be reached (ACK bit doesn’t get pulled down by slave device), `I2C_transfer ()` still returns `1`, which equals `I2C_STS_SUCCESS`, although the transmission aborted directly after querying the device address without even sending the actual payload.

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

What processor is this?

0 Frank Brütting over 6 years ago in reply to Biser Gatchev-XID

Intellectual 270 points

Ah sorry, the AMIC110.

0 Lalindra Jayatilleke over 6 years ago

TI__Mastermind 30365 points

Frank,

Could you please elaborate a bit on what SW you are using?
Is it the PDK example?

Lali

0 Frank Brütting over 6 years ago in reply to Lalindra Jayatilleke

Intellectual 270 points

I’m using the Profinet example. My code is the following:

// Use Pins E17 and E18
PRCMModuleEnable (CHIPDB_MOD_ID_I2C, 1U, true);
HWREG (0x44e1096c) = 0x0000002b;
HWREG (0x44e10968) = 0x0000002b;

I2C_init ();

I2C_Params_init (&i2c_params);

i2c_launchpad = I2C_open (I2C_INSTANCE_LAUNCHPAD, &i2c_params);

I2C_transactionInit (&trans);

status = I2C_transfer (i2c_launchpad, &trans);

0 Garrett Ding over 6 years ago in reply to Frank Brütting

TI__Mastermind 43296 points

Frank,

It seems status = I2C_STS_SUCCESS is only updated in polling/blocking mode in the function I2C_primeTransfer_v1(), then the retVal = I2C_primeTransfer_v1() always return '1' in callback mode. What is your setting for transaction.masterMode?

Regards,
Garrett

0 Frank Brütting over 6 years ago in reply to Garrett Ding

Intellectual 270 points

Hi Garrett,

I²C works in master mode (`transaction.masterMode = true`), what gets set by `I2C_transactionInit ()` and doesn’t get overwritten afterwards.

0 Garrett Ding over 6 years ago in reply to Frank Brütting

TI__Mastermind 43296 points

Frank,

Actually I was looking for the setting of i2cParams.transferMode (I2C_MODE_BLOCKING or I2C_MODE_CALLBACK), but somehow pasted transaction.masterMode in previous post. By design, with 'I2C_MODE_CALLBACK', I2C_transfer queues transactions and does not block. When the I²C device can't be reached, the actual transfer will be timed out:

/* Initiate I2C transfer */
transferOK = I2C_transfer(i2c, &transaction);

if(transferOK)
{
if (cbMode)
{
if (I2C_osalPendLock(cbSem, timeout) != SemaphoreP_OK)
{
goto Err;
}
}

Regards,
Garrett

Processors

Processors forum

RTOS/TI-RTOS: AMIC110 I2C transfer issue