Examples fail to run on ESP8266

[jarkman]

I've just been trying to bring up Example1_DistanceArray with a VL53L5CX (https://www.sparkfun.com/products/18642) on an ESP8266 (a Wemos D1 Mini Pro).

I get something similar to the other forum participants trying to run this on ESP8266 in the thread at https://forum.sparkfun.com/viewtopic.php?p=231366, an endless reset loop with

ets Jan 8 2013,rst cause:2, boot mode:(3,6)

The ExceptionDecoder tool gives me the stack trace below. It suggests that readMultipleBytes is somehow running off the end of its buffer, but I can't see how that might happen.

Hope that helps, thanks!

Exception 3: LoadStoreError: Processor internal physical address or data error during load or store
PC: 0x40201524: SparkFun_VL53L5CX_IO::readMultipleBytes(unsigned short, unsigned char*, unsigned short) at /home/richard/Arduino/libraries/SparkFun_VL53L5CX_Arduino_Library/src/SparkFun_VL53L5CX_IO.cpp line 82
EXCVADDR: 0x4023b439

Decoding stack results
0x40201511: SparkFun_VL53L5CX_IO::readMultipleBytes(unsigned short, unsigned char*, unsigned short) at /home/richard/Arduino/libraries/SparkFun_VL53L5CX_Arduino_Library/src/SparkFun_VL53L5CX_IO.cpp line 82
0x40201460: SparkFun_VL53L5CX_IO::begin(unsigned char, TwoWire&) at /home/richard/Arduino/libraries/SparkFun_VL53L5CX_Arduino_Library/src/SparkFun_VL53L5CX_IO.cpp line 27
0x40201a26: _vl53l5cx_send_xtalk_data(VL53L5CX_Configuration*, uint8_t) at /home/richard/Arduino/libraries/SparkFun_VL53L5CX_Arduino_Library/src/vl53l5cx_api.cpp line 165
0x40202973: vl53l5cx_init(VL53L5CX_Configuration*) at /home/richard/Arduino/libraries/SparkFun_VL53L5CX_Arduino_Library/src/vl53l5cx_api.cpp line 318
0x40201438: SparkFun_VL53L5CX_IO::isConnected() at /home/richard/Arduino/libraries/SparkFun_VL53L5CX_Arduino_Library/src/SparkFun_VL53L5CX_IO.cpp line 34
0x40201460: SparkFun_VL53L5CX_IO::begin(unsigned char, TwoWire&) at /home/richard/Arduino/libraries/SparkFun_VL53L5CX_Arduino_Library/src/SparkFun_VL53L5CX_IO.cpp line 27
0x40202d54: Print::write(char const*) at /home/richard/.arduino15/packages/esp8266/hardware/esp8266/3.0.2/cores/esp8266/Print.h line 59
0x40201786: SparkFun_VL53L5CX::startRanging() at /home/richard/Arduino/libraries/SparkFun_VL53L5CX_Arduino_Library/src/SparkFun_VL53L5CX_Library.cpp line 220
0x40202fc8: Stream::readString() at /home/richard/.arduino15/packages/esp8266/hardware/esp8266/3.0.2/cores/esp8266/Stream.cpp line 248
0x402042c9: __pinMode(uint8_t, uint8_t) at /home/richard/.arduino15/packages/esp8266/hardware/esp8266/3.0.2/cores/esp8266/core_esp8266_wiring_digital.cpp line 39
0x402010ab: setup() at /tmp/arduino_modified_sketch_534223/Example1_DistanceArray.ino line 41
0x40203634: user_rf_pre_init() at /home/richard/.arduino15/packages/esp8266/hardware/esp8266/3.0.2/cores/esp8266/core_esp8266_phy.cpp line 353
0x40100db1: realloc(void*, size_t) at /home/richard/.arduino15/packages/esp8266/hardware/esp8266/3.0.2/cores/esp8266/umm_malloc/umm_malloc.cpp line 1113

[PPVJM]

I will investigate and get back to you as soon as I have any update on this.

[jarkman]

Thanks, and good luck! R.

…

On Thu, 10 Feb 2022 at 16:41, Ricardo Ramos ***@***.***> wrote: I will investigate and get back to you as soon as I have any update on this. — Reply to this email directly, view it on GitHub <sparkfun/SparkFun_VL53L5CX_Arduino_Library#4>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABZ6LKVZ6LC3UM5NJ5JND3U2PTEPANCNFSM5N72NJ6Q> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you authored the thread.Message ID: ***@***.*** com>

[PPVJM]

I was able to reproduce the issue and found the cause of the problem. Will work on a fix on the next days.

[jarkman]

Thanks! There's also some helpful-looking comment in the forum, I haven't tried the suggested workaround yet:
https://forum.sparkfun.com/viewtopic.php?f=68&t=57066&sid=ff28e9a5a183a7748b1d82aefe5363cf

[nseidle]

This was resolved [via forums](https://forum.sparkfun.com/viewtopic.php?f=68&t=57066&sid=ff28e9a5a183a7748b1d82aefe5363cf:

"It's now working if you set Arduino IDE -> Tools -> "Byte/Word access to IRAM/PROGME (very slow)"
In addition, disable the software watchdog with ESP.wdtDisable() before if (myImager.begin() == false) and then re-enable it with ESP.wdtEnable(3000)"