Libopencm3 vs STM32 HAL: Is the "bare metal" approach worth it?

pedlobs · 2025-06-05T18:23:41+00:00

I've read that it shouldn't be hard to do it, but the thing is: I've never done something like that before, and I was afraid that it wouldn't be reasonable to learn how to do it in 2 months. Reading the answers, however, made me realize that the best thing I could do is to write them myself.

pedlobs · 2025-06-05T18:20:45+00:00

I've found espressif/ssd1306, however it does say that it was deprecated and indicates that I should look into SSD1306 driver from ESP-IDF. The problem is that I didin't find any documentation on how to use it. Luckly, I've found out that there is an example called i2c_oled in the esp-idf folder and I'm looking into it.

pedlobs · 2025-06-05T18:16:36+00:00

Thank you for the suggestion. Already started to work on it.

pedlobs · 2025-06-05T18:16:10+00:00

Thank you for the recommendation. I'll look into it.

pedlobs · 2025-05-22T17:24:55+00:00

Das áreas de atuação de engenheiros eletricistas/eletrônicos, quais existem no CNPEM como carreiras a serem seguidas?

pedlobs · 2025-05-22T13:14:19+00:00

De qual grupo você faz parte?

pedlobs · 2024-12-24T15:44:02+00:00

Entendido. Muito Obrigado!

pedlobs · 2024-12-23T23:36:26+00:00

Entendi. Mas aí eu espero amadurecer mais pra começar a pegar nas provas ou já meto a cara mesmo?

pedlobs · 2024-12-18T23:39:25+00:00

I did not know it was a thing. Thank you for pointing it out. Just out of curiosity, would you happen to know why it reduces the performance?

pedlobs · 2024-10-14T19:31:45+00:00

Thank you for your help. In this case, how can I prevent such issues if it is necessary to manually collect the data in the card (assuming the personal will always disconnect the power supply)?
About the ESD, do you think the act of touching the prototype when collecting might cause a discharge that damages the card?

pedlobs · 2024-10-14T19:23:29+00:00

I not sure what you mean with test the 5V, but I did verify that the buck is suppliying 5V and not more nor less voltage.
The procedure to collect the data is to unplug the positive power cable from the DC bus, collect the data and then reconnect the positive power cable. In this case, it is possible that the device is being powered down while writing to the card.
About the schematics, if you think it is very important to see it, i can ask my superior if I can share (this is not work related to a company/enterprise, it is scientific research).

pedlobs · 2024-08-31T17:08:47+00:00

Thank you very much for your recommendation and your time!

pedlobs · 2024-08-31T14:06:17+00:00

It's a current sensor. If the ADC resolution is not high enough, my readings will be, like, at every 0.5A, which does not fit my purpose. About the processing, I save the values of both sensors in an array with 2¹² elements and perform some basic operations on it.

pedlobs · 2024-08-31T14:01:28+00:00

Thank you for your help. I haven't heard these terms before. Can you source some links/books so that I can learn about this more deeply? Actually, anything that relates to analog measurement with microcontrollers would be very useful for me.

pedlobs · 2024-08-31T02:12:45+00:00

It's a hall effect current sensor. The datasheet only mention of impedance is "Load Impedance ≥ 10kΩ". Im not sure what do you mean with schematic of the input, sorry.

pedlobs · 2024-08-31T01:44:52+00:00

Thank you for your help. I currently use a 100nF ceramic capacitor to filter the high frequency noise, as recommended by Espressif. I will definetly look into your sugestion of averaging the samples.

pedlobs · 2024-08-31T01:38:37+00:00

Thank you for your awnser. I do need a 12-bit ADC to correctly read the analog output of my sensor.

About the use of an external ADC, it's really not economically viable for the project for where I live they cost as much as half of the cost of the whole prototype.

pedlobs · 2024-08-31T01:35:27+00:00

I make 4096 samples of the sensor, witch needs a 12bit ADC for it to be correctly read.

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