nrf52832, sd card and accelerometer.

[Iigori]

Hello!

I have both SD Card and accelerometer in same SPI bus. Both of them working like charm if another is not present. I'am using app_sdcard from 52 sdk.

Can i use spi manager for my accelerometer or does that effect to sd card drivers?

I have found that SD Card drivers are using gpio to enable and disable CS but problem is that its uses handler. When i try to use same SPI master the sd card:s handler doesn't like data from accelerometer.

I have tried to add NRFX_SPIM_FLAG_NO_XFER_EVT_HANDLER to modified nrf_drv_spi_transfer, but then i don't get any data out and it still gives me

<error> app: ERROR 3 [NRF_ERROR_INTERNAL] at C:\nrf\components\libraries\sdcard\app_sdcard.c:987
PC at: 0x0002D26B

And error is from app_sdcard spi_handler.

As i did have few pins to spare. I seperated SD Card and accelerometer to own busses and it still does not work.

SD Card setup:

CS: pin 11

SCK: 16

MOSI: 17

MISO: 18

Using SPI 2 instance

Accelerometer:

CS: 12

SCK: 5

MOSI: 4

MISO: 3

Using SPI 1 instance

The one which initializes first works and other is not doing anything.

I have another sensor which uses i2c and it uses TWI instance 0

[Iigori]

Problem solved. When initialized one of the device first that made another device BUS auto detect fail. That caused devices to not work in the right way.

[TTN]

Hi, I try the same structure using a sensor and sd card, the code flow is like the 12453.main.c seems that you solve the problem, would you share the solution you use to solve the problem? 

[Iigori]

Hi, i just initialized sd card first, then reseted accelerometer and reinitialized it.

[TTN]

Hi, thanks for your reply, I encounter a problem, I didn't put fatfs_example() and initAcc(); in the main(), but it always runs the function fatfs_example() to read SD card, did you solve this problem before? How?