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Quentin Santos

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My first PCB: AIC3204 eval board I had some fun with the Adafruit TLV320DAC3100. This is a small board built around the...
2 weeks ago
1

My first PCB: AIC3204 eval board

from Quentin Santos [alt+shift+b] in programming

2 weeks ago
I had some fun with the Adafruit TLV320DAC3100. This is a small board built around the (TLV320)DAC3100 audio chip. “DAC” stands for “Digital-to-Analog Conversion”; that is, it takes some audio signal (here, I²S) and converts it to the analog equivalent (differential for speakers,...
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A few spikes in Pico cos() A picture is worth a thousand LLM prompts: Horizontal value is the input value x for cosf(x),...
15th Aug 2026
1

A few spikes in Pico cos()

from Quentin Santos [alt+shift+b] in programming

15th Aug 2026
A picture is worth a thousand LLM prompts: Horizontal value is the input value x for cosf(x), ranging from 0 to 2π. The orange line shows the result of evaluating cosf(x), which looks exactly as expected. The blue line shows the time it took to evaluate cosf(x) for each x, in...
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The RP2350 is too fast I had a few hours of “fun” figuring out why my RP2350 could use my ILI9341 display, but not the...
15th May 2026
1

The RP2350 is too fast

from Quentin Santos [alt+shift+b] in programming

15th May 2026
I had a few hours of “fun” figuring out why my RP2350 could use my ILI9341 display, but not the ST7796 one. To be more specific, displaying stuff with the first display worked flawlessly, while the ST7796 would display a single frame correctly, and then glitch. Depending on the...
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The RP2350-USB-A cannot see devices disconnect What’s better for New Year’s Eve than debugging some USB hardware issues? In my previous article, I...
1st Jan 2026
1

The RP2350-USB-A cannot see devices disconnect

from Quentin Santos [alt+shift+b] in programming

1st Jan 2026
What’s better for New Year’s Eve than debugging some USB hardware issues? In my previous article, I explained how the design of Waveshare’s RP2350-USB-A can make the USB-A host connector incapable of detecting certain USB devices, and of any hot-plugging. The solution was to...
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Fixing the RP2350-USB-A not working as USB host tl;dr: you need to desolder R13, the resistor closest the pin 6 of the board, as indicated by the...
20th Nov 2025
3

Fixing the RP2350-USB-A not working as USB host

from Quentin Santos [alt+shift+b] in programming

20th Nov 2025
tl;dr: you need to desolder R13, the resistor closest the pin 6 of the board, as indicated by the red arrow in the cover picture of this article Context I am currently toying around with emulating a USB device. However, I also wanted to be able to plug a keyboard in, so I needed...
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The serial TX path seems to be down The previous series of articles about UART was initially motivated by an error I was getting when...
11th Aug 2025
38

The serial TX path seems to be down

from Quentin Santos [alt+shift+b] in programming

11th Aug 2025
The previous series of articles about UART was initially motivated by an error I was getting when using the ESP-Prog. I could have jumped straight to the conclusion, but I took the time to really understand what was going on, and we are finally reaching the end of this...
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The missing part of Espressif’s reset circuit In the previous article, we peeked at the reset circuit of ESP-Prog with an oscilloscope, and...
2nd Jul 2025
147

The missing part of Espressif’s reset circuit

from Quentin Santos [alt+shift+b] in programming

2nd Jul 2025
In the previous article, we peeked at the reset circuit of ESP-Prog with an oscilloscope, and reproduced it with basic components. We observed that it did not behave quite as expected. In this article, we’ll look into the missing pieces. An incomplete circuit For a hint, we’ll...
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Reproducing Espressif’s reset circuit I recently discussed how Espressif implements automatic reset, a feature that lets users easily...
28th Jun 2025
56

Reproducing Espressif’s reset circuit

from Quentin Santos [alt+shift+b] in programming

28th Jun 2025
I recently discussed how Espressif implements automatic reset, a feature that lets users easily update the code on an Espressif microcontroller. There are actually more subtleties than a quick look would suggest, and I spent a fair bit of time investigating them. This article and...
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Arduino’s Automatic Reset As mentioned in my previous article, I am planning to publish a long-form article on UART. I am...
1st May 2025
33

Arduino’s Automatic Reset

from Quentin Santos [alt+shift+b] in programming

1st May 2025
As mentioned in my previous article, I am planning to publish a long-form article on UART. I am doing a series of shorter articles to lay the groundwork. This is one of these “short” articles; this one about how Arduino uses UART. Of course, I still went way too deep in this...
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How to use “real” UART I recently went into a deep dive on “UART” and will publish a much longer article on the topic. This...
10th Apr 2025
63

How to use “real” UART

from Quentin Santos [alt+shift+b] in programming

10th Apr 2025
I recently went into a deep dive on “UART” and will publish a much longer article on the topic. This is just a recap of the basics to help put things in context. Many tutorials focus on using UART over USB, which adds many layers of abstraction, hiding what it actually is. Here,...
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