rpi-gpio-dma-demo | Performance writing to GPIO with CPU and DMA

rpi-gpio-dma-demo is a C library typically used in Internet of Things (IoT), Raspberry Pi applications. rpi-gpio-dma-demo has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

Experiments to measure speed of various ways to output data to GPIO. Also convenient code snippets to help get you started with GPIO. I provide the code in [gpio-dma-test.c] ./gpio-dma-test.c) to the public domain. If you use DMA you need the mailbox implementation; for that note the Broadcom copyright header with permissive license in [mailbox.h] ./mailbox.h). You can compile this for Raspberry Pi 1 or 2 and 3 by passing the PI_VERSION variable when compiling. The resulting program gives you a set of 6 experiments to conduct. By default, it toggles GPIO 14 (which is pin 8 on the Raspberry Pi header). To understand the details, you want to read [BCM2835 ARM Peripherals][BCM2835-doc], an excellent dataheet to get started (if you are the datasheet-reading kinda person).