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RTC and RPI4

  • Posts: 912
  • Thank you received: 86

RTC and RPI4 was created by maxthebuilder

Hi All,
SM 1.4.3.
RTC works fine on my RPI3.
On my new RPI4 I cannot make it work.
I have dtoverlay=i2c-rtc,ds3231 added to my config.txt (it was there by default).
When I issue sudo i2cdetect -y 1, nothing shows up.
How to configure RTC on RPI4, please?
Thanks!
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
4 years 7 months ago #43177

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Replied by Andrew on topic RTC and RPI4

I2C baudrate can not be too high (Ask me how I know!)
You can try manually setting it in /boot/config.txt
dtparam=i2c_baudrate=400000
100000-500000 should work with RTC's
Good luck.
4 years 7 months ago #43181

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Replied by maxthebuilder on topic RTC and RPI4

Thanks!
No. This didn't make any difference.
I still get:
stellarmate@stellarmate:~$ sudo i2cdetect -y 1
 
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         
stellarmate@stellarmate:~$

Maybe the module is defective?
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
Last edit: 4 years 7 months ago by maxthebuilder.
4 years 7 months ago #43190

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Replied by Wouter van Reeven on topic RTC and RPI4

When you type dmesg in a terminal, do you see anything related to the RTC module?
4 years 7 months ago #43191

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Replied by Andrew on topic RTC and RPI4

You may find some answers in this forum. Please report back if you do.
www.raspberrypi.org/forums/viewtopic.php...4ac9da28afebe866be49
4 years 7 months ago #43192

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Replied by maxthebuilder on topic RTC and RPI4

No nothing related to it as far as I can tell...
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
4 years 7 months ago #43216

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Replied by maxthebuilder on topic RTC and RPI4

It behaves as the module doesn't exist or defective..
I tried another RTC module (exactly the same) which did work with RPI3.
Same story. Doesn't show up when I issue sudo i2cdetect -y 1.
: (
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
4 years 7 months ago #43217

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Replied by Andrew on topic RTC and RPI4

I got an RTC for my new RPi4 and at first it did not show up. But changing my i2c bus speed while tweaking it for my motor controller board suddenly made it show up. Or so I thought. The next time I configured the system I could not repeat my earlier success. I thought maybe the higher speed damaged it. But now I'm not sure because others are also having trouble.
4 years 7 months ago #43227

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Replied by maxthebuilder on topic RTC and RPI4

So.. I am not alone..
Was anyone able to make RTC work with RPI4?
Thanks!
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
4 years 7 months ago #43235

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  • Thank you received: 86

Replied by maxthebuilder on topic RTC and RPI4

Reporting: RTC works in SM 1.4.4 (KDE)
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
4 years 7 months ago #43297

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