Search found 143 matches

by gunar.kroeger
Fri May 31, 2019 7:07 pm
Forum: General Discussion
Topic: What happens with SD card if it gets unpowered during write?
Replies: 10
Views: 1966

Re: What happens with SD card if it gets unpowered during write?

I think that I will abandon FATFS. It looks like it really isn't design for robustness. We can't risk having to format the card and loose all logged data if the FATFS gets corrupted. Even if I get the unmount right during a power-down, there can be an unforeseen bug that causes a crash forcing the e...
by gunar.kroeger
Fri May 31, 2019 4:04 pm
Forum: General Discussion
Topic: What is the best practice for push-button event tracking/handling without any hardware debouncing circuit
Replies: 7
Views: 3570

Re: What is the best practice for push-button event tracking/handling without any hardware debouncing circuit

You don't need to wait for a long button press to debounce it. Just save the esp_log_timestamp of when the button is released and ignore any new button press for the next say 100ms This should still be responsive enough and very simple to implement Also, use gpio interrupt to check for the button pr...
by gunar.kroeger
Fri May 31, 2019 3:57 pm
Forum: General Discussion
Topic: What happens with SD card if it gets unpowered during write?
Replies: 10
Views: 1966

Re: What happens with SD card if it gets unpowered during write?

Have a look at the GPIO example. This is the way you can trigger something to happen outside an IRQ. https://github.com/espressif/esp-idf/blob/master/examples/peripherals/gpio/main/gpio_example_main.c yes, from what I understand it does the same as using event queue. But it is an extra delay. If do...
by gunar.kroeger
Fri May 31, 2019 3:40 pm
Forum: General Discussion
Topic: PEM Certificate expires in September?
Replies: 2
Views: 733

Re: PEM Certificate expires in September?

It just isn't clear to me if we have to do anything special in the server to keep the certificate forever or something

We generated a certificate that will expire in 7 days so we can test it
by gunar.kroeger
Fri May 31, 2019 2:51 pm
Forum: General Discussion
Topic: PEM Certificate expires in September?
Replies: 2
Views: 733

Re: PEM Certificate expires in September?

gunar.kroeger wrote:
Fri May 31, 2019 2:21 pm
EDIT: there is a ENABLE_MBEDTLS_CERTIFICATE_EXPIRACY_CHECK option in menuconfig disabled by default.
Does this mean it will not break and I don't have to worry?
found this post that seems to confirm it:
viewtopic.php?t=7585
by gunar.kroeger
Fri May 31, 2019 2:21 pm
Forum: General Discussion
Topic: PEM Certificate expires in September?
Replies: 2
Views: 733

PEM Certificate expires in September?

The examples show how to add PEM certificate to the flash (howsmyssl_com_root_cert.pem) All working fine to connect through HTTPS to our server. But a certificate has an expiration date. So after September I imagine the communication will suddenly stop, and we will not be able to do OTA to fix it. A...
by gunar.kroeger
Fri May 31, 2019 2:00 pm
Forum: General Discussion
Topic: What happens with SD card if it gets unpowered during write?
Replies: 10
Views: 1966

Re: What happens with SD card if it gets unpowered during write?

Just stick a 1-20F cap on your power rail depending on all what your power needs are. Use the built in A/D to detect the power fail, and close the file system right away. A cap like this will give you 10's of seconds of running time when the power fails. This is what I had done on the previous vers...
by gunar.kroeger
Thu May 30, 2019 2:06 pm
Forum: General Discussion
Topic: What happens with SD card if it gets unpowered during write?
Replies: 10
Views: 1966

What happens with SD card if it gets unpowered during write?

- You have a data logger writing data to a file every 100ms. - You send a fsync and fflush every 5 seconds - After every hour you close the log and open a new one. If there is a power down, could you loose more than the last 5 seconds of log? Are the writes on the FAT sector atomic? or could the SD ...
by gunar.kroeger
Mon May 27, 2019 1:37 pm
Forum: General Discussion
Topic: ESP-IDF and BG96 GSM Module
Replies: 7
Views: 2566

Re: ESP-IDF and BG96 GSM Module

Hi @leonardo.zambonelli,

I'm thinking of using the BG96 Module.
Are you still having problems with it?

Thanks
by gunar.kroeger
Thu May 16, 2019 5:40 pm
Forum: General Discussion
Topic: Why make -j8 flash rebuilds the project?
Replies: 8
Views: 1881

Re: Why make -j8 flash rebuilds the project?

Hi, recently i found that changing Makefile also is causing full project rebuild. It has to do this because there's no way for Make to know what you changed. For example, if the change added a compiler flag to CFLAGS for every source file compilation then it needs to rebuild every source file to ge...

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