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UPDATE: After judicious use of apt-get -f install and many many calls to dpkg -ignore-depends= -i and some other stuff too, I was able to successfully apt-get install bzip2. I will attempt to refine the process later.

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Well, no much things to say here. I mean, you don’t have to make any connections, no soldering, nothing. Just plug the USB power cable on the board, connect the USB Blaster to on the 10-pin header and to you computer USB port, download and install the Quartus and then git clone the following the project and open it in the Quartus.

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All you actually need is a USR-TCP232-24 board. Although I’ve bought it a couple of years ago you can still find many if those especially in alibaba and quite cheap. It’s a nice board no matter what and it can be used for several other stupid projects (for example a KNXnet/ip device would be a good candidate). The company that manufactures these modules it seems that it changes their hardware quite often. At some point they’ve changed their USR-TCP232-24 (LPC1114+DM9000) with the USR-TCP232-410S and USR-TCP232-410-PCBA (TM4C129EKCPD w/ integrated MAC) and now they don’t officially sell only PCB board but they sell the device with the casing. I’ve also bought two of the USR-TCP232-410-PCBA to play with at some point as they have a more powerful Cortex-M4 processor.

From the things I’ve seen my opinion is that the LTO combined with the -Os does the most significant difference compared the other options. That means that the gcc compiler optimizations outperform clang and also it seems that musl doesn’t give much more compared to glib. Of course the last statement isn’t always true.

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This means that we want to get a pointer in the absolute address of struct x when we know that in the position 120 we have a blue member. The container_of() macro will return the offset of the blue member (which is located in 120) minus the relative offset of blue in the x struct. That will evaluate to 120-2=118, so we’ll get the offset of the x struct by knowing the offset of the blue member.

This board is power either from the USB connector either from the 5V or 3/3V on-board pins. Never use both of them at the same time!

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The author of the hobby OS Blueillusion writes:“I present BlueIllusionOS (current version: 0/036 – 07112004), an Operating System for i386 architecture, which I am working on for two and a half years now. It is still in its childhood stages, but nevertheless, I’ve already implemented a variety of features: Lazy Paging, GUI (with sevaral widgets), ext2 read only support, PCI support and a text shell with command history.

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In addition with the compilers, we also have the system libraries which also play significant role in the resulted binary size. GLib is the low level system library used by gcc and it’s huge! You would never consider the system library size when developing desktop applications, but for small embedded systems GLib is a behemoth. There are various light-weight replacement GLib libraries for the arm-none-linux-eabi, like the musl lib. You can see a comparison of few libraries here.

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For the record there is a difference in the layout between vet6 and zet6 boards. The vet6 has the SD card on the top right side and the usb connector on the top left side and the zet6 has these components mirrored. Also, this post is written in 2021 so if you read this in 2030 then expect to find those boards in a museum.

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You can find cheap development boards for both stm32f407vet6 and stm32f407zet6 micro-processors on e-bay for $11 and $15. The vet6 is a bit cheaper compared to zet6. Their only difference is the package and therefore the number of available GPIOs. In more detail the vet6 has 100 pins (LQFP100 package) and 82 GPIOs and the zet6 has 144 pins (LQFP144 package) and 114 GPIOS and both have 512KB flash and 192KB ram. If you think that the additional 32 GPIOs worth paying $4 more then go for it, or if you’re like me and hate dilemmas buy both and be happy. Therefore, search e-bay for stm32f407vet6 or stm32f407zet6 and buy the cheapest ones.

Actually, I would advice you to do that always as the I2S rate is very sensitive to the XTAL frequency and therefore even small variations on the XTAL speed wil have an affect on the output I2S rate. For more info check the table 127 in 28/4.4 in the reference manual which are the ‘correct’ values, but I suggest that you use an oscilloscope to trim the N value as the on-board crystal sucks. Using the oscilloscope try to find the correct value that gives more precise frequencies for the LRCK (I2S clock).

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Well, this is a completely stupid project and is quite simple to build. All the needed components costs around $10. This the list of the components and their approximate price on ebay (you may find these even cheaper).

So, to sum up, we have different optimization flags, compilers and system libraries. Now, we can proceed with the benchmarks by using all these different options and see what happens.

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OK, so now let’s get to the point. Is there any difference between GCC versions? Yes, there is, but you need to see that in different angles. So, for the -Os flag it seems that the GCC7-2021-q4-major produces a binary which is ~380 bytes smaller without -flto and ~550 bytes with -flto from the second better GCC version (GCC6). That means that GCC7 will save you from changing part to another one with a bigger flash, only if your firmware exceeds the size by those sizes with GCC6. But, what are the changes, right? We’re not talking about 8051 here.

Why not make it WiFi controlled and also have a web interface? And this how stupid projects are made. Do to that we’ll need the following components.

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Ihave discussed with older maemo maintainer Alessandro Pasotti. He (andeven older maemo maintainer) had done some maemo/hildon specificmodifications, and I have checked them. But none of their codemodifications is needed.

Ok, this project is really stupid and I’ll probably never going to use it for any of my next projects, but it was fun doing it nevertheless. I have a bunch of these adjustable LM2596 DC-DC boards in one of my “magic” component cabinets, that you can find quite cheap in ebay (~$1/5).

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The ESP8266 shows up again on this stupid project as also on the first one. Copy-paste from the previous post follows: it’s easy to modify the source code with the SDK and also you can use any network capable device to interact with them. I’ll write a separate post about ESP8266 in the future and how you can write your own code for these modules. You can find them cheap in ebay and they cost around $2/50. There are a few types of this module that they have a different flash size (512KB, 1MB), but the only thing that you should care about now is that it needs to support 9600 baud rate and not only 115200, because I’m using a software serial library for the arduino that behaves much better on lower baud rates. Be aware that ESP8266 is a 3V3 only device.

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Also, many cheap linux-enabled SBCs are showing up these days. For example have a look at Omega2, which is a $5 SBC with Linux, 64MB memory, 16MB storage, USB, WiFi, I2C, SPI, i2S and 15 GPIOs. On the other side a cheap stm32f103c8t6 board (Cortex-M3) costs $2/5 and an stm32f407vet6 board costs $7. NXP ARM mcus are much more expensive as also Renesas, Cypress and others. Of course, the STM boards have more peripherals and still they have their use, but the future for the most mainstream products seems to be the ultra low cost Linux IOT ready boards and for that reason we need smaller size binaries and better performing compilers and tools.

The first time that the stm32 powers up after a firmware update, it will try to load the configuration data from the flash. If it doesn’t find a valid configuration then it creates a default configuration. In the default configuration the stm is not able to connect to any AP and the pre-defined POT values are all set to 127 (which means 5KΩ). You can use the USB or UART interface to update the configuration data for the AP SSID and password. To do that just connect the stm via a USB cable on your computer and open a terminal (I always prefer to use Bray’s terminal). Whatever terminal you use make sure that the LF char is handled as (CR & LF). Bray’s terminal has that option by checking the [CR=LF] checkbox in the settings area and the [+CR] next to the [-> Send] button.

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Note: Not all systems will use /dev/sdX. Some systems may designate the card as /dev/mmcbkY. Use the device which would be /dev/sdX or /dev/mmcbkY.

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I’ll add here a couple of notes how to build it, because it’s not very clear from the README file. You can either clone the repo and use QtDesigner to load the project and and build it, or you can use cmake. In case you use cmake you need the Qt libs and header (version >= 5) in your system.

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Connect an RS232 cable to the device and enter HELP and <Enter> key to print the available commands. Anyway, use the macros and the [email protected]’s terminal, trust me, it’s the easiest way.

When you unsolder the blue resistor POT from the LM2596 PSU module, then you’ll have three empty holes on the PCB. The LM2596-POT1 and LM2596-POT2 terminals are connected to the PCB holes next to the OUT+ output. There are two main power inputs, the one is the VIN that is connected to the AMS1117-3/3 and provides power to the circuit and the other is the PSU V+ that comes from the external power supply you’re going to use for the LM2596. Therefore, the [LM2596-POT1/2] and [PSU V+ in/out] are connected to the LM2596 PSU. The USB_UART (P1) is not necessary to use and it’s just the debug UART port.

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There are two reasons for this post. The first one is to write some thoughts about when is preferred to use bare-metal, RTOS or Linux on embedded products. The second reason was this video, which leads to the question that after we’ve decided that we need to use Linux, then what options and tools do we have; and most importantly what happens with the code and binaries size? Well, in embedded you should care about size, because that can limit your options and also can affect your product cost, development time and budget.

Also, there are other two alternatives which I haven’t test them yet. They’re much cheaper but you can’t program the DMX address easily. You may find them as DM-103 and DM-104 in ebay or if you search for generic DMX512 Decoder Boards.

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You don’t want to come near a deadline and realise that you don’t know your tools well enough to overcome issues. Oh, no. That would be a nightmare. I think the experience on a language is not how to write the syntax and standard functional procedures, but all the little minor bits under the hood that you’ll only need once in a single project and if you don’t have the experience, it will hit you back.

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The stm32 is powered either from the USB port when it’s connected on the PC or from the AMS1117-3/3. Therefore, you need to be careful with that, so if you’re going to use a USB adapter or connect the stm32 to your PC then you need to remove the K1 jumper. If you’re not going to use the USB interface then place the jumper.

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Depending on your OS (Windows or Linux) follow the instructions in the README. What you actually need is a bare metal arm compiler, cmake and then run the build script. After that you’ll find the binary file in build-stm32 folder. Flash this bin on the stm32 board and reset the board. If you feel adventurous spend some time to read the crap source code.

You’re going to need a few passive components to implement a low-pass filter (LPF) for the internal stm32 DAC. Nothing fancy, just a resistor R=1300Ω and a capacitor C=5/9nF. More details about the LPF later.

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You don’t have to build the code to use it, but I suggest that you do as you need to change a few parameters in the source files. The pre-build binaries of the latest build are located in the firmware folder, therefore you can use the ST-Link utility on windows to flash the hex file or the st-flash utility on Linux to flash the bin file.

Now that the struct offset is “normalized”, we don’t even care about the size of the green member or the size of the structure because it’s easy the absolute offset is the same with relative offset. This is exactly what &((TYPE *)0)->MEMBER does. This code dereferences the struct to the zero offset of the memory.

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Use the language that your code base uses. That way you’ll use a well tested code, probably free of bugs and you’ll only need to use fragments and snippets that you already have. I’ve tried to convert projects from C to C++. Of course, it’s fun in the beginning and then when you proceed to more complex code, you may realize that you’re too bored to do this and you’ve already spend much time on it. This sucks, but tbh you need to try this at least once, for a small project. Therefore, go with your code base!

Finally, you’re going to need a programmer. Again ebay has plenty of cheap USB programmers.

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Macros are just predefined data that you can send over the serial port by pressing the corresponding macro button. And also you can use a timer for every macro and send it automatically every x programmable intervals in milliseconds. That’s pretty much all you need when you developing a firmware. But this functionality was not implemented yet in CuteCom.

As an example I’ll suppose that the AP SSID name is “Router” and the WPA2 password is “MyPassword”; of course, you need to change these with your own. To update the configuration send the following commands to the terminal.

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By gestures I mean, that instead of sending the ADCs in realtime, instead support only the basic directions like up, down, left, right and button press and then send the gesture combinations through USB. If you’re using mouse gestures to your web browser, then you know what I mean.

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I’ll answer this for you straight away. Use whatever language you like and you’re really good at when you do your own personal projects; and when working as a professional use the language of your company’s codebase.

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The difference between eRTOS and Linux is huge. It’s much more complex to develop on an eRTOS compare to Linux, because in the eRTOS most of the times you’ll need to implement your own subsystems and underlying tasks that usually the Linux already provides. Also the Linux separated the kernel from the user space applications, but on a eRTOS the separation is not always achievable and you need to write in several different places in the eRTOS. On the other hand Linux takes care of all the low level mumbo jumbo and you only have to write your app using the kernel API. So what are the criteria that you decide which to choose?

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Does your MCU tools really support C++? If you’re using GCC then the answer is yes, but that’s not always the case. There are still vendors that they don’t have C++ compilers for their MCUs or these C++ compilers are not ones to trust. In this case you need to go with C. Also, the vendor may supply libraries only for C then in this case go with C.

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The original file contained around 12,000,000 devices. We decided a million would be enough to release.

You’ll also need a step-down DC power supply module to power the components, like the AMS1117-3/3. There are some cheap pre-soldered modules with the AMS1117 on the ebay, I’ve found 5pcs for less that $1, which means $0/20 for each.

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You can just proxy in both directions data from the RS232 port to a TCP client or a remote UDP port. So cutecom becomes a TCP server that listens to a user-defined port and is also able to bind a user-defined UDP port and send to a specific uses-defined UDP port. These two things can be activated at the same time, so it’s not either one of the other. This plugin is also an object, so you can create as many as you like. Finally, the main window plugin interface has indicators that show the plugin enable state and the TX/RX traffic. This is a screenshot of this plugin enabled.

Can these results help us to get a decision on the thin line between choosing an RTOS and a Linux OS for an embedded product? Well, don’t expect this answer from me. You are the one to decide what is right for you, but I’ll tell you what I would do.

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WARNING: MeeGo is an open source project. If you're not familiar with what the open source project is all about, you better not try to install the MeeGo image to your N900 (more info here) device. If you choose to install the solution, you do it completely at your own risk.

That was another meaningless stupid project. I mean really, you can’t do anything useful with these stuff, but you can experiment and use pieces to implement other more useful projects like a DDS that can output different waveforms or even a synthesizer. It’s also quite rare to find code for the STM32 even in the internet that uses DMAs with double buffering and FIFOs for both DAC and I2S, so keep the code for reference.

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CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)- NETWORK Support (PCI): CONFIG_E1000 Support for Intel 8254x gigabit chips. CONFIG_E1000_FALLBACK_MAC default MAC for empty EEPROM after production. CONFIG_EEPRO100 Support for Intel 82557/82559/82559ER chips. Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM write routine for first time initialisation. CONFIG_TULIP Support for Digital 2114x chips. Optional CONFIG_TULIP_SELECT_MEDIA for board specific modem chip initialisation (KS8761/QS6611). CONFIG_NATSEMI Support for National dp83815 chips. CONFIG_NS8382X Support for National dp8382 gigabit chips - NETWORK Support (other): CONFIG_DRIVER_AT91EMAC Support for AT91RM9200 EMAC. CONFIG_RMII Define this to use reduced MII inteface CONFIG_DRIVER_AT91EMAC_QUIET If this defined, the driver is quiet. The driver doen't show link status messages.

You’ll see that the output anti-aliasing filtering is much better now, compared the example with the DACs. In this case is not possible to get frequencies higher than 22KHz.

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I haven’t build a PCB for this project and it is only a proof of concept on my breadboard. These are the schematics of the circuit you need to build.

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When the jumber is on the GND position then the device functions in DMX512A mode using the RS485 to send the data. When the jumber is places in the CFG position then the device enters the debug mode.

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You don’t really need this for the project if you already have a DMX512A compatible device. If you don’t then you can buy a cheap RGB LED strip from ebay and a DMX512A decoder driver and have fun. A nice and quite cheap driver is the PX24506. It has 3x 3A channels for RGB, DMX-in and DMX-out to connect drivers in series and you can set the DMX address with a binary switch.

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Now, use a terminal (I’m using [email protected]’s Terminal) and open the COM port using 115200, 8 data bit, no parity, 1 stop bit and no handshake. Also make sure that the received CR bytes are handled as CR+LF (CR=LF option in Brays terminal).

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Now insert the Micro SDHC card into your card reader and attach it to your PC. You will need to determine the correct device designation for your card. If your system does not auto recognize your Micro SDHC card, you can manually find it with the following command.

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The ‘step’ for a digital pot defines it’s resolution, so for a 10KΩ pot with 100 steps (like the X9C103P) each step is 10ΚΩ/100=100Ω. That’s quite large when it’s used in voltage a divider like the pot on the LM2596 board. On the other hand by using a digi-pot like the MCP41010 that has 256 steps, the resolution gets much higher. You can find these microchip digi-pots on ebay for around $1/5 each.

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Well, you’re going to build a sine generator, so it’s good to have an oscilloscope. Also you may need a breadboard or a prototype breadboard to implement the LPF.

You apply a DC input voltage and then you get a step-down DC output on the other side. You can control the output voltage with a 10KΩ pot (the blue block device with the screw on top).

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Container_of() and offsetof() macros are a beautiful piece of code. They are compact, simple and have everything in there.

Finally, you need an ST-Link programmer to upload the firmware. Generally, I have the original ST-Link V2 and the Segger J-link programmers, but to be honest, most of the times I’m using one of these cheap st-link copies; which I find much more convenient to use on the limited workspace. Of course, I suggest you to buy the original ones, but if you also have a limited space then buy one of those from ebay.

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Why an FBI laptop would have a file with personal information on 12 million iOS users, we don’t know – especially since 10000 of them are Dutch/Belgian, and last I checked, those do not fall under FBI jurisdiction. Did the FBI obtain it from an application developer, or from Apple itself?

Anyway, what’s the main difference between the internal DAC and this PCM5102? Well, the first one is internal! That means that there everything is happen in the STM32, no external components, no protocol interfaces, nothing. This means increased speed but less performance as the internal DAC is a basic 12-bit DAC. On the other hand now, by using an external DAC you get better performance as the chip is dedicated and engineered for the purpose, but this also mean that you need an interface to drive the DAC. In this case the I2S interface is used and it’s set to 16/48 (16-bit & 48KHz). Well, 16/48 it’s more than enough for my old rusted ears and it’s fine for testing. Maybe at some point I can try if STM32 can go up to 32/192 which is the highest that the STM32’s I2S can get (the PCM5102 supports up to 32/384).