The power consumption is increased when application is migrated from SDK13.0.0(S132 4.0.3) to SDK15.0.0(S132 6.0.0)

[chaoren2651]

Hi, Nordic team:

     I have migrated application from SDK13.0.0(S132 4.0.3) to SDK15.0.0(S132 6.0.0)  on four productions(Prepare for mass production ), but all have the same problem that the power consumption is increased between 600+ uA to 3mA。After careful examination，I think it's related to SPIM driver, the consumption is 600uA+ when invoke nrf_drv_spi_init() and 3.5mA when invoke the nrf_drv_spi_transer() and it's normal after I invoke the nrf_drv_spi_uninit().

  note:

     1. the device connected to SPI bus is LIS3DH

     2. the consumption is normal with SDK13.0.0

     3. application code include SPI driver and LIS3DH's driver is not changed

   

     I found that SDK15.0.0 have big change in peripheral driver named nrfx module, can you help me solve the problem ASAP? thanks very much!!!

[Jørgen Holmefjord]

Hi,

Did you use SPIM peripheral (SPI with EasyDMA enabled) in SDK 13 as well (SPIx_USE_EASY_DMA set in sdk_config.h)? Are you using the nrfx legacy driver layer, or the new drivers directly?

Could you share code showing how you configure SPI and an example showing this issue?

Best regards,
Jørgen

[chaoren2651]

Yes, I use SPIM peripheral with EasyDMA enabled and I use the nrfx legacy driver.

[Jørgen Holmefjord]

Do the increased current come when only initializing SPIM, or do you have to do something more (starting transfer, etc.)? It sounds like your CPU is not able to go to sleep. I setup a test with the SPI example in SDK 15, where a application timer triggers a SPIM transfer every 5 ms. The average current consumption in ~44 µA:

[Peter Kenyon]

Any more thoughts on this, I see a current consumption of 400+ uA just by enabling the spim driver (with no transfers), the current goes down when I call spim_deinit(), using the spi (no m) driver I do not see this behaviour but I was hoping to use easy DMA

[Jørgen Holmefjord]

This could be related to errata 89.