CCS/CC1310: Issue with I2C Adress & fwDelayUS in Sensor Controller Software

Part Number: CC1310
Other Parts Discussed in Thread: HDC1080

Tool/software: Code Composer Studio

Hello,

I'm using the sensor controller for reading out the temperature from the HDC1080, I have implemented the code for testing in a normal TIRTOS task first and everything works well. After that I commented out all code from the task and moved to Sensor Controller Ctudio.

Currently I have several issues:

1. Why must be the I2C address from the slave multiplied by two, that it's getting correct ex. 0x40 to 0x80?
2. Why is the fwDelaysUs funtion below not working properly between the two I2C operations? On my oscilloscope I see only the first operation and then it stops, when I remove the fwDelayUS function I see both operations.The delay between the two operations is mandatory.

//first operation
i2cStart();
i2cTx(0x80 | I2C_OP_WRITE);
i2cTx(0x00);
i2cStop();

fwDelayUs(4000,FW_DELAY_RANGE_5_MS);

//second operation
i2cStart();
i2cTx(0x80 | I2C_OP_READ);
i2cRxAck(temp);
i2cRxAck(output.temperature[n]);
i2cStop();