RTOS/CC2650: Switching between SPI and I2C during run-time, shared pins - different functions

Eresh Suwal

Part Number: CC2650

Tool/software: TI-RTOS

I need to communicate with a sensor that can be configured for both I2C and SPI and I need to be able to use both (not at the same time).

I'm using Register Service. Depending on interface ID, I need to talk to the device over I2C or SPI.

I'm using sensortag example project.

A pin MISO_AD0 needss to be an input in SPI mode and an output (to set i2c address bit0) in i2c mode.

How can i do this?

over 7 years ago

0 Eresh Suwal over 7 years ago

Prodigy 40 points

After I call i2c_close, i thought i'd be able to call spi_open and re-use the pins for spi. But apparently, the close is not releasing the pins so another driver can use it.
Am I missing something?

0 AB over 7 years ago

TI__Mastermind 23516 points

Hello Eresh,

I do not see how this is not possible. You will need to make sure you are handling the drivers accordingly by closing and opening the drivers. You have to be very careful not to have Two of the drivers opened at the same time.

Regards,
AB

0 Eresh Suwal over 7 years ago in reply to AB

Prodigy 40 points

Hi AB,
Even if I close the I2C driver before opening the SPI driver. it doesn't do it. Firmware hangs on SPI_Transfer and BLE connection times out.
How can i make sure the pin resources are free to be used by other drivers?

0 AB over 7 years ago in reply to Eresh Suwal

TI__Mastermind 23516 points

Hello Eresh,

The best way to manage resources in a RTOS is to use semaphores.

Regards,
AB

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RTOS/CC2650: Switching between SPI and I2C during run-time, shared pins - different functions