nrfx_spim_xfer rx buf not fill up properly

[Desmond G]

I am trying to read from the LIS3MDL sensor using spim on the nrf52840 dongle. I gave the rx buffer with the length of 7bytes. Whenever i tried to read from the sensor, I was expected the buffer to read {0xff, 0x3d,0,0,0,0,0} but got this instead

This is how i set up the spi read 

I am developing on NCS v1.5.1.

[hmolesworth]

value is a 32-bit pointer so sizeof(value) is 4 bytes not 7 bytes

[Desmond G]

value is a uint8_t pointer, i am passing an unsigned 8bit array of 7 into the function.

[ovrebekk]

Hi

You will still get a size of 4 if you apply sizeof on a pointer. 

What happens if you set the rx_length to 7 instead?

Have you checked the SPI lines on a scope to see if the data looks fine on the bus?

Best regards
Torbjørn