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CC2652RB: Reason to use ADC_close() and other close functions?

Matt Gaidica1
Expert 1540 points
Part Number: CC2652RB
Other Parts Discussed in Thread: ENERGYTRACE

The adcsinglechannel.c thread going through initializing and opening the ADC module for each sample, then closing it. If I have an application that takes an ADC sample at 1Hz (from the same channel) is there any advantage to closing the channel with every sample? I guess the same goes for SPI, and I2C... would it be purely a benefit to memory or would it affect power consumption as well?

  • 0
    Guru 735685 points

    If you still use those driver later in your application, I don't think you need to call close function. There might be only a little benefit to memory but It might not be relevant too much on power consumption.

  • 0
    TI__Guru** 101460 points

    Matt, YiKai,

    Generally speaking, by closing the drivers you have an effect both on the memory (RAM) and on the power consumption. If you are interesting by the details, you can have a look to the drivers' source code (stored in <SDK>\source\ti\drivers\<DRIVER>\). For example, as you can see in the functions SPICC26X2DMA_close(), I2CCC26XX_close() and I2S_close(), the module is powered down (at least you stop clocking the module and remove the power dependency). This is also true for ADC_close(). As you can see the pin is closed by ADC_close() (i.e. the pin is set in the default state that should be more power effective). However the gain is not that big.
    Last point, the open-close procedures consume a bit of power (basically because some computation are run by the CPU).

    I suggest you to test the two options and see which one is the more power effective. As you are using a Launchpad, this can be easily done using EnergyTrace.

    Best regards,