circuitpython: SPI + Bluetooth crash nRF52840

Calling the write() method of an SPI object while Bluetooth is active crashes the firmware.

Here is a minimal code that reproduces the issue:

import board
import busio
from ubluepy import Peripheral

p = Peripheral()
p.advertise()

spi = busio.SPI(board.P0_22, MOSI=board.P1_00)
while not spi.try_lock():
    pass
spi.write(bytes([0xff]))

If you comment out the last line (the call to spi.write()), then it doesn’t crash anymore. Tested on the nRF52840 USB Dongle.

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 19 (3 by maintainers)

Most upvoted comments

I disabled SPIM3 in nrfx_config.h and the problem seems to have been resolved. I can now run a blue advertise and then mount my SPI SD Card

diff --git a/ports/nrf/nrfx_config.h b/ports/nrf/nrfx_config.h
index f217cb053..a9bee8912 100644
--- a/ports/nrf/nrfx_config.h
+++ b/ports/nrf/nrfx_config.h
@@ -27,9 +27,9 @@
 
 // Enable SPIM2 and SPIM3 (if available)
 #define NRFX_SPIM2_ENABLED 1
-#ifdef NRF52840_XXAA
-    #define NRFX_SPIM3_ENABLED 1
-#endif
+//#ifdef NRF52840_XXAA
+//    #define NRFX_SPIM3_ENABLED 1
+//#endif

jerryneedell on Oct 12, 2018

This BLE + SPIM crash sounds quite similar to this issue: https://devzone.nordicsemi.com/f/nordic-q-a/33982/sdk-15-software-crash-during-spi-session/130572. I’m inquiring.

dhalbert on Oct 12, 2018

Since it does not occur on the nrf52832, It could be related to the s140 SD or something in the nrf52840 code. Both are differences.

jerryneedell on Oct 10, 2018