If the bus is not in use, the processor can request an address from the controller. If the bus is in use, the processor will go back to waiting. After waiting a random amount of time, a processor will check if the bus is being used. Each processor node implements a random back-off technique to request an address from the controller on the shared bus. All of the remaining nodes operate as processor nodes. The same PicoCray code runs on all nodes, but a grounded pin on one of the Pico modules indicates that it is to operate as the controller node. The PicoCray project connects multiple Raspberry Pi Pico microcontroller modules into a parallel architecture leveraging an I2C bus to communicate between nodes. cleverly demonstrates that if one Raspberry Pi Pico is good, then nine must be awesome. On the software side of things, the design is a now a familiar show, with core0 running the application’s high-level processing, and core1 acting in parallel as the rendering engine, determining static DAC codes to be pushed out to the DACs using the DMA and the PIO.Ĭontinue reading “Bust Out That Old Analog Scope For Some Velociraster Fun!” → Posted in hardware, Tool Hacks Tagged analog oscilloscope, breadboard, dac, dma, PIO, Raspberry Pi Pico, raster, vector, X-Y mode Using a Pico to drive a pair of AD767 12-bit DACs, the outputs of which drive the two ‘scope input channels directly, this breadboard and pile-of-wires hack can produce some seriously impressive results.
The result is the Velociraster, a simple (in hardware terms) Raspberry Pi Pico based display driver. This time, the target is the humble analog oscilloscope, specifically a Farnell DTV12-14 12 MHz dual-channel unit, which features a handy X-Y mode. is back again with another installation of CRT shenanigans. Posted in FPGA Tagged PIO, Raspberry Pi Pico, verilog Things like the can2040, an implementation of the CAN bus protocol using the PIO. While the simulator can be used to debug programs, step through instructions, and inspect waveforms, the ultimate value of bringing the PIO to other systems is that now we can re-use the code. It’s an incredible feat of reverse engineering. The project is still incomplete but slowly making progress. A few example programs are included in the repo, such as outputting a pleasant guitar note over I2S and driving a chain of WS2812s. There’s a simulator to test different programs, and the project targets the Blackice MX and the Ulx3s. For assembling PIO code, uses Adafruit’s pioasm assembler they use for their MicroPython framework. This particular implementation is based only on the spec that Raspberry Pi provides. Not content with it just being a part of RP2040-based projects, has been porting the PIO to Verilog so anyone can enjoy it. However, one of the most exciting bits of hardware onboard is the Programmable I/O (PIO). We’ve seen some pretty incredible hacks using the Raspberry Pi 2040.
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