random things I made and things I learnt making them
Introduction Here we want to enable network access between the target board and the host dev. Rather than use the ethernet interface (which may not always be available on the target) we can provide power and connect via ethernet to the target board using the USB interface and the USB Gadget framework provided by Linux.…
If you don't know the type at compile time you can just use the template parameter type and the compiler will deduce the type from the function call itself. For example, see the commented out c'tor below. This is great for typing the size of std::array function parameter. However you could come unstuck if a…
Server This sends 10 floats at a time, on a loop. The transmit data type is determined by the '=%sf' % payload.size format string passed to struct.pack .…
MCIMX6UL-EVKB is a i.MX 6UltraLite Evaluation Kit. It uses the NXP i.MX 6ULL (900 MHz Arm Cortex®-A7 core, MCIMX6Y2DVM09AB). Instructions based on the porting guide - https://www.nxp.com/docs/en/user-guide/IMX_PORTING_GUIDE.pdf Your eval board boots, but it hangs during the "starting linux kernel" message. You can't debug the Linux kernel because it hasn't loaded yet. So the next option…
The STM32CubeIDE can be used to generate device tree source file (.dts) for your embedded linux image. These describe the hardware for the board on which linux will run. This is compiled into a device tree binary file (.dtb) which is included on the image and loaded by u-boot along with the Linux kernel zImage.…
Custom Board Design First lets discuss the hardware. There are vendor boards available: Evaluation boards are expensive due to the large number of external connectors and integrated circuitry (including FPGAs and HDMI decoders!). These are really meant for sales demos. Any development work done on these would be wasted time since your own custom design…
Previous Post Block diagram - System Overview The step sequencer will be interface with the Novation BassStation via the ribbon cable on the left, with optional support for 3rd devices via a MIDI interface on the right. This will allow the sequencer to be reused for other MIDI-supported devices. Microcontroller pinout The microcontroller pinout specifics…
Previous Post Front panel design So lets talks about how we want the front panel to be laid out. Lets start with the connector interface: 20-Pin Ribbon cable connector for the synth interface switching. Power (in the form of a barrel connector). MIDI in/out (for future compatibility with 3rd party devices). Convention says we put…
Previous Post Power Supply Requirements Description Total 1 MCU (STM32G0B1) 3.3V 10mA, at max settings 10mA 2 BassStation I/O 5V 8uA; each ch, drawn from bass station connector 8uA 3 RGB LED Driver IC (TLC5955) 5V 2 x 1.5A (500mA per colour group) 3A 4 Keyscan IC (ADP5587) 3.3V 200uA per key pressed 50uA per…