Miso_bus_issues

[Nero]

Hello,

I am using nRF SDK 12.2.0 , with nRF52832 on pca10040 hardware, and working with the example in examples/peripheral/spi/main.c to develop a driver for LIS2DE12. When I write a hexadecimal value greater than 7 I find a problem. I test the registry reading which I am (0x0F) which has a default value equal to 0x33 (I found 0x3F) and register CTRL_REG1 which has A default value equal to 0x20 (I found the right value0x07)

Any ideas as to what's going on? Thanks you .

[Nero]

I think the problem came from "nrf_drv spi_transfer" function ( i tested reading register who I am ), but i don't know where is the issue

[Susheel Nuguru]

If you are trying to send one byte commands to your sensor then you might be affected by this hardware issue that sends additional byte. The work around is given and you need to implement it in your code for SPI single byte transfers.

[Susheel Nuguru]

your code seems ok. So you see problems only when you write value greater than 7 to some register? Values below 7 work OK? then it might not be related to the additional byte transfer bug.

[Nero]

Yes , I think In fact no , There is a problem that I can not understand where the problem is, there are bits '1' which is added (but I think the problem is in the function in read: because test the registers who i am and i Lis 0x3F instead of 0x33)

[Nero]

Here I write 0x06 and read 0x07 Here I write 0x01 and read 0x01 Here I write Ox00 and read 0x00 Here I write 0x80 and read 0x80 Here I write 0x32 and read 0x32 Here I write 0x17 and read 0x1F