Problem with MISO pin SPI

RE: Problem with MISO pin SPI

noob_with_ucontrollers — Mon, 27 May 2019 17:29:55 GMT

For reference of other people who might have this issue with NRF52 ble data sending it reads from a peripheral device,

A friend was kind enough to help me with this, and it turned out the issue I was facing was that I was trying to send BLE data too fast for the ADC... adding a delay function at the end of the code in main while () loop gave NRF enough time to read from ADC then transmit to the app...
Thank you everyone!

RE: Problem with MISO pin SPI

Håkon Alseth — Tue, 26 Mar 2019 09:51:26 GMT

Have you tried scoping the pins to see if there's anything happening on the pins? Does SPI work if you run the example in the sdk/examples/peripheral/spi?

Kind regards,

Håkon

RE: Problem with MISO pin SPI

noob_with_ucontrollers — Mon, 25 Mar 2019 15:44:25 GMT

I get this when I run that command

So I think the UICR is being set properly and my pins 9,10 are set as gpios by the software.

Is there anything else that I should check to make sure pin 9,10 is in fact being used by SPI...

And I do not think I need the hardware reconfiguration stated in the manual for using NFCT as gpios because my nrf52 is on a PCB stand alone custom chip.

RE: Problem with MISO pin SPI

Håkon Alseth — Mon, 25 Mar 2019 08:08:41 GMT

Please install the nrf5x command line tools in order to install nrfjprog:

https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF5-Command-Line-Tools

Kind regards,

Håkon

RE: Problem with MISO pin SPI

noob_with_ucontrollers — Mon, 25 Mar 2019 00:46:21 GMT

when I am running the command in the command prompt this is what I get:

I am not sure if this is what you meant though. I have not used this command to view registers before.

RE: Problem with MISO pin SPI

Håkon Alseth — Wed, 20 Mar 2019 09:13:45 GMT

Hi,

The command to run is already stated:

nrfjprog --memrd 0x1000120C

Run it from a cmd.exe prompt and see if the read out content is as expected.

After that, if you see any issues, scope the SPI lines to see if there's any problems.

BR,

Håkon

RE: Problem with MISO pin SPI

noob_with_ucontrollers — Mon, 18 Mar 2019 18:55:12 GMT

I tried using another pin for MISO (pin P0.17 and then pin P0.3) but the MISO behaves strangely even with these pins. I don't think the problem is that the NFC config is still there.

When I configured pin 17 and 3 as MISO (I converted my set up to the Dev Kit) the MISO is pegged to 1.25 V instead (in case of both pins). Which is unnatural for the spi miso. I receive a data array of "0x-OC-00-00-00-00-FF-FF-FF-FF" instead.

When I use SPI MODE_0 instead of MODE 1. I get "0x7FFFF" as data. (but I am sure the ADC is not compatible with modd 0)

RE: Problem with MISO pin SPI

noob_with_ucontrollers — Mon, 18 Mar 2019 17:43:04 GMT

I do not know how or where to run the nrfjprog command?

However, I guessed you were asking me to see if the UICR reg for NFC was set correctly like this guy in this post said https://devzone.nordicsemi.com/f/nordic-q-a/22909/repurposing-nfc-pins-for-spi-issues

so I used to debugger instead of nrfjprog.

When I debug my program. The program does not get as far as the 0x100020C reg it stops here and gives me this.

RE: Problem with MISO pin SPI

Håkon Alseth — Mon, 18 Mar 2019 16:11:34 GMT

[quote user="noob_with_ucontrollers"]What does power cycling the device mean? [/quote]

Power it off, and then on again.

RE: Problem with MISO pin SPI

noob_with_ucontrollers — Mon, 18 Mar 2019 15:59:45 GMT

Okay, I will make sure of these things. I am running the code on a custom PCB..
What does power cycling the device mean?

Thanks

RE: Problem with MISO pin SPI

Håkon Alseth — Mon, 18 Mar 2019 15:32:28 GMT

Hi,

Are you using the nRF52-DK, or are you developing on a custom board?

If you want to use these pins on a nRF52-DK, you need to move two resistors:

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52/dita/nrf52/development/nrf52_dev_kit/hw_nfc.html?cp=2_1_4_5_10

You can verify the readback content using nrfjprog to see if this was properly set:

nrfjprog --memrd 0x1000120C

Note that you need to power cycle the device in order for the "CONFIG_NFCT_PINS_AS_GPIOS" define to be latched properly.

Kind regards,

Håkon