CC1310: Write a byte via I2C using the "i2ctmp007" example application provided in the SimpleLink CC1310 SDK

brinix

Part Number: CC1310

In the "i2ctmp007" example application, only a reading action is being performed because there are no commands to send to the sensor. However, in my application, I am using the BME280 humidity, pressure, and temperature sensor which needs to be configured. Consequently, I need to send commands to it via I2C.

How to read bytes from the sensor is clear to me using this I2C configuration:

/* Point to sensor data*/
txBuffer[0] = BME280_DATA_ADDR; // sensor data address
i2cTransaction.slaveAddress = BME280_I2C_ADDR_SEC; // I2C address
i2cTransaction.writeBuf = txBuffer;
i2cTransaction.writeCount = 1;
i2cTransaction.readBuf = rxBuffer;
i2cTransaction.readCount = 8; // data length

Then the data is stored in rxBuffer and can be accessed.

Can you please quickly explain how to write data into a register?

Thank you!!

over 7 years ago

0 AB over 7 years ago

TI__Mastermind 23646 points

Hello Brinix,

In order to write data to a register you must send the register you wish to access followed by the data you want to write to it. In other words txBuffer will be the buffer of messages to be sent and the count the number of bytes (2 bytes for register and value) same thing with the rxbuffer and rxcount.

We actually provide ready and easy to use drivers for the BME280 sensor located here: dev.ti.com/.../

Regards,
AB

0 brinix over 7 years ago in reply to AB

Intellectual 440 points

Thank you for the quick response and helpful link. This resolved my issue.

0 brinix over 7 years ago in reply to AB

Intellectual 440 points

Hello again,

Can I access the API's source code please?

Thanks

0 AB over 7 years ago in reply to brinix

TI__Mastermind 23646 points

Hello Brinix,

You can download the sail plugin (Sensor SDK) and the sources for all the sensor drivers we support on this SDK can be found here:

C:\ti\sail_1_20_00_02\source\ti\sail

Regadrs,
AB

0 brinix over 7 years ago in reply to AB

Intellectual 440 points

Hello AB,

Thanks a lot! I need another service please. If I want to merge two projects, let's say "rfPacketTx" and "i2cbme280" in order to remotely send the data, is there an easy way to do that? If not, what would you recommend to do?

Thanks,

Brinix

0 AB over 7 years ago in reply to brinix

TI__Mastermind 23646 points

Hello,

With our simplelink platform you can copy over the i2cbme source file over to the rf project. and you can add it as a second task running simultaneously with the rftask. In order to pass data you will need to pass it using semaphores or mutexes. The following link does something similar but using the uartecho example and a message queue.

dev.ti.com/.../

Regards,
AB

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CC1310: Write a byte via I2C using the "i2ctmp007" example application provided in the SimpleLink CC1310 SDK