Problem with u8g2.ssd1327_i2c_ea_w128128 (and all other ssd1327_i2c driver)

[webstatic]

Expected behavior

Do not reboot itself

Actual behavior

It causes the device to reboot.

Many times it reboots after print('init ssd1327_i2c_ea_w128128').
Sometimes it reboots after print('sendBuffer'), and show "hello" on display.
About one to five chance that it will display "hello" and reboot.

But It never pass disp:sendBuffer() line.

Test code

local scl = 1
local sda = 2

local sla = 0x3C
i2c.setup(0, sda, scl, i2c.SLOW)
print('init ssd1327_i2c_ea_w128128')
disp = u8g2.ssd1327_i2c_ea_w128128(0, sla)
print('setFontRefHeightExtendedText')
disp:setFontRefHeightExtendedText()
print('setDrawColor')
disp:setDrawColor(1)
print('setFontPosTop')
disp:setFontPosTop()
print('setFontDirection')
disp:setFontDirection(0)

print('clearBuffer')
disp:clearBuffer()
print('setFont')
disp:setFont(u8g2.font_6x10_tf)
print('drawStr')
disp:drawStr(0, 0, "hello");
print('sendBuffer')
disp:sendBuffer()

NodeMCU startup banner

branch: dev
commit: 6316b33
release:
release DTS: 202101162126
SSL: false
build type: float
LFS: 0x0 bytes total capacity
modules: bit,file,gpio,i2c,net,node,spi,tmr,u8g2,uart,wifi
build 2021-01-18 08:47 powered by Lua 5.1.4 on SDK 3.0.1-dev(fce080e)

Hardware

• 3V3 -> VCC
• GND -> GND
• D2 -> SDA
• D1 -> SCL

[webstatic]

And when use disp:drawXBM, it displays about haft of the image before the reboot, with random progress.

[Natalia]

It can be:
power issue (onboard 3.3V regulator is not powerful enough) - use external voltage regulator
watchdog timed out - increase I2C speed; ssd1327 datasheet says on page 62 that it supports clock up to 400 kHz

Check "rst cause" after reboot:
Reset Cause | Description
0 | Unidentified
1 | Power reboot or normal boot
2 | External reset using reset pin or wake up from deep sleep
3 | Software reset
4 | Hardware watchdog (WDT) reset

[webstatic]

Thank you for your reply.

Yes, I think the reason is watchdog timed out.
When I change some code to

node.setcpufreq(node.CPU160MHZ)
i2c.setup(0, sda, scl, i2c.FASTPLUS)

the chance that it will not reboot is higher.

reset_reason is 3

Can I do something about it?

[Gregor Hartmann]

You could try and feed the software watchdog. https://nodemcu.readthedocs.io/en/release/modules/tmr/#tmrwdclr
You could also split the code in several methods which you separate by node.task.post()

You could also post (some of) the output of the reboot.

node.bootreason() returns 2 Values, the second contains better diagnostics. see https://nodemcu.readthedocs.io/en/release/modules/node/#nodebootreason

[webstatic]

Thank you for your reply.

The watchdog reset comes inside single C function
u8g2.ssd1327_i2c_ea_w128128(0, sla)
or
disp:sendBuffer()
so tmr.wdclr() in lua won't work.

I not sure about node.task.post(), sometimes it works, sometimes don't

node.bootreason() is 2 3, reset (software?) and software watchdog reset.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.