Trouble running Adafruit Tag Example on nRF52840 DK

[shockline]

I am trying to use PN532 on nRF52840. Nordic SDK has an example Adafruit Tag Example but it is for nRF52832. I have ported the example but it fails in TWI Communication.

What did I do ?

• In makefile change every occurrence of pca10040 to pca10056
• In makefile change every occurrence of nRF52832 to nRF52840
• Copy sdk_config.h from TWI Scanner example to Adafruit Tag Example

Problems I am facing

LOG :

<error> app: End of error report
<info> app: NFC EXAMPLE Adafruit tag reader started.
<info> adafruit_pn532: Creating I2C
<info> adafruit_pn532: Looking for PN532
<info> adafruit_pn532: Trying to get the firmware version
<info> adafruit_pn532: Trying to send command
<info> adafruit_pn532:  02                     |.
<info> adafruit_pn532: Sending command
<info> adafruit_pn532:  00 00 FF 02 FE D4 02 2A|.......*
<info> adafruit_pn532:  00                     |.
<info> adafruit_pn532: Failed while calling TWI tx 1, err_code = 33282
<info> adafruit_pn532: Failed to write command, err_code = 33282
<info> adafruit_pn532: Failed to send GetFirmwareVersion command, err_code = 33282
<info> adafruit_pn532: Didn't find PN53x board, err_code = 33282
<error> app: ERROR 33282 [NRF_ERROR_DRV_TWI_ERR_DNACK] at ../../../main.c:405
PC at: 0x00004D3B
<error> app: End of error report

I am not able to detect PN532. More precisely TWI command fails to send. The error received is NRF_ERROR_DRV_TWI_ERR_DNACK.

Another strange thing is that on pressing reset nRF doesn't log again.

[awneil]

shockline said:

The error received is NRF_ERROR_DRV_TWI_ERR_DNACK

Have you looked-up what that error means?

It sounds like you're getting a NACK somewhere ...

So have you used a scope or analyser on the I2C lines to see what's actually happening?

shockline said:

Another strange thing is that on pressing reset nRF doesn't log again

Could be that the I2C bus has locked-up - again, a scope or analyser on the I2C lines would help you there.

Also use the debugger to see what the code is doing ...

[shockline]

After many trials it is finally working. Here is what I did.

For Makefile

I added the recommend changes on top of the changes already made before.

Øyvind said:

Please change the following (- is remove, + is add):

For sdk_config.h

This time I took sdk_config.h file from example as it is. Didn't change anything into the original file.

For anyone interested in the project

Here is the project in a zip.

[Øyvind]

Glad to hear you finally got it working!

[awneil]

Thanks for feedback.

Don't forget to Verify your answer - so that people will see that it's resolved!