CC2640R2F: Sensor controller Studio i2c timeout status always

Abhishek Yakkundi

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2650

Hello,

I'm working on custom made cc2640r2f sensortag devices with Sensor controller studio 2.0.0.324.

I'm trying to communicate with the temperature sensor via I2C using sensor controller studio and I'm always getting i2cStatus==0x0002(timeout) and not getting the values of the temperature register.

Below is the code which I have written to read temperature value from register

i2cStart();

i2cTx(I2C_OP_WRITE | Sensor_I2C_ADDR);

i2cTx(Temp_Reg_Address);

fwDelayUs(10000, FW_DELAY_RANGE_10_MS);

if (state.i2cStatus == 0x0000) {

i2cRepeatedStart();

i2cTx(I2C_OP_READ | Sensor_I2C_ADDR);

i2cRxNack(output.humidityval);

}

i2cStop();

This is the code written in Execution Code field of sensor controller studio.

Has anyone faced such issues?

Please advice.

Thanks.

over 7 years ago

0 Eirik V over 7 years ago

TI__Guru 56590 points

Hello Abhishek,

I advice you to connect a logic analyzer to the SDA and SCK lines to verify correct signal levels, timing and addressing.

Perhaps you can find useful info in the app note "Integrating Sensor Controller Studio Examples Into ProjectZero" found in resource explorer.

0 Abhishek Yakkundi over 7 years ago in reply to Eirik V

Expert 1785 points

Thanks for the reply.

I have even tried I2C light sensor program on CC2650 launchpad and I have got the i2c status error again.
But this time the i2c status error I'm getting is 0x0003.
What is the issue I'm not able to run even the demo example and check the i2c implementation on sensor controller studio.

Please advice.

Thanks.

0 Eirik V over 7 years ago in reply to Abhishek Yakkundi

TI__Guru 56590 points

Hello Abhishek,

Please refer to the sensor device data sheet for information about return codes, correct addressing, etc.

Have you made sure to connect external pull-up on the I2C lines. Refer to I2C Bus Pullup Resistor Calculation for more information.

It is best to observe the actual signals on the I2C lines for debug.

0 Abhishek Yakkundi over 7 years ago in reply to Eirik V

Expert 1785 points

Hi Eirik thanks for the reply.

I actually have done successfully sensor reading without sensor controller studio and directly using CCS and BLE5 stack 1.40 but I'm not able to do with the help of sensor controller studio as I'm getting i2cstatus error.
Also integrating that code with CCS I'm getting different i2cstatus error sometimes 775 and sometimes 779.

Please advice.

Thanks.

0 Eirik V over 7 years ago in reply to Abhishek Yakkundi

TI__Guru 56590 points

Hello,
Have you tried to run your code in SCS task testing while you connect a logic analyzer to SCK and SDA to verify the signals?

0 Abhishek Yakkundi over 7 years ago in reply to Eirik V

Expert 1785 points

hey Eirik,

While debugging if I apply CRO probe with wires to the sensor SCL pin and other to ground then only i2c.status is becoming zero and I'm getting some sensor values, but I'm not sure what actually is happening as I get values only when probe's applied else it giving i2c status error always.

Any suggestions?

0 Eirik V over 7 years ago in reply to Abhishek Yakkundi

TI__Guru 56590 points

Are there external pull-ups on the I2C lines as I mentioned in my post above at Wed, Apr 25 2018 10:17 AM ?
Can you share the Schematic?

0 Abhishek Yakkundi over 7 years ago in reply to Eirik V

Expert 1785 points

I have already successfully done the program on CCS using I2c driver so there is mostly no issues of external pull-ups.

Anyways i have shared the cropped schematic of microcontroller and external pull-ups above.

Please advice.

0 Eirik V over 7 years ago in reply to Abhishek Yakkundi

TI__Guru 56590 points

Hello,
Perhaps the solution is in this thread:
e2e.ti.com/.../595660

0 Abhishek Yakkundi over 7 years ago in reply to Eirik V

Expert 1785 points

hi Eirik,

I tried what you suggested in the post

scifInitIo(9, AUXIOMODE_OPEN_DRAIN_WITH_INPUT, -1, 1);
scifInitIo(10, AUXIOMODE_OPEN_DRAIN_WITH_INPUT, -1, 1);

By changing the third argument to 1:

scifInitIo(9, AUXIOMODE_OPEN_DRAIN_WITH_INPUT, 1, 1);
scifInitIo(10, AUXIOMODE_OPEN_DRAIN_WITH_INPUT, 1, 1);

But this also doesn't solve my issue I'm still getting i2c_status as 1 itself.

Please advice any other solutions.

Thanks.

0 Eirik V over 7 years ago in reply to Abhishek Yakkundi

TI__Guru 56590 points

I was mainly referring to the 7-bit addressing mentioned by Roman:
e2e.ti.com/.../2192436

If you are still stuck you must connect a logic analyzer and investigate the actual signals.

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CC2640R2F: Sensor controller Studio i2c timeout status always