A high-precision, high-sampling-rate ADC interface was engineered for an industrial monitoring system, enabling ultra-low-latency, high-fidelity capture at 50 kSPS per channel. Built on the NXP i.MX8M Plus SoM with a PREEMPT_RT Linux kernel, quad-core Cortex-A53, and Cortex-M7 co-processor, the system delivered deterministic real-time performance. The project included custom kernel tuning, optimized SPI handling, M7 firmware, and a web-based dashboard for live data visualization, ensuring reliable insights now. Below are some client requirement:
Reliable 50 kSPS per-channel acquisition with minimal jitter and zero data loss.
Stable end-to-end ADC-to-dashboard latency for accurate industrial monitoring.
Seamless Cortex-M7 and A53 coordination for continuous, high-volume ADC processing.
Implementing 50 kSPS per channel via SPI with little jitter and data loss. Deterministic ADC sampling-to-web visualization delay. Using Cortex-M7 co-processor for real-time processing of high-volume streams.
Standard Linux SPI and user-space polling could not ensure real-time 50 kSPS sampling, causing jitter and data loss risks.
Achieving predictable, low-latency delivery from ADC sampling to web display was difficult due to kernel delays and context switching.
Handling large ADC data streams without stressing memory or CPU requires optimized buffering and efficient transfer methods.
Offloading ADC sampling to the M7 introduced coordination challenges with the A53, requiring efficient low-latency communication.
Generic Linux SPI needed major upgrades, including DMA support, to sustain high-speed, low-overhead transfers reliably.
Offloaded ADC timing to Cortex-M7, optimized Linux kernel and SPI driver, enabled real-time web visualization.
Cortex-M7 handles ADC sampling and buffering; RPMsg-based kernel driver on A53 receives aggregated data via kfifo buffer.
Dedicated SCHED_FIFO real-time kernel thread ensures minimal latency; asynchronous RPMsg callback efficiently handles data.
PREEMPT_RT Linux kernel, CPU affinity, and real-time scheduling prioritize critical ADC handling and data processing.
Reads kernel-buffered samples, performs post-processing, and serves data via WebSocket's for the web interface.
Real-time waveform display, responsive UI, channel selection, and sampling control via lightweight HTML/JS interface.
Silicon Signals offers embedded and industrial systems with real-time precision and scalable solutions.
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Results You Can Count On
NXP i.MX8M Plus SoM, high-speed ADC, SPI interface, Cortex-M7 co-processor
User-space daemon, WebSockets, JavaScript charting libraries (Chart.js/Plotly.js), Tailwind CSS
Custom Embedded Linux with PREEMPT_RT, kernel module development, RPMsg communication
SPI debugging, kernel FIFO, real-time scheduling, WebSockets monitoring, lightweight web server (Nginx/Lighttpd)
Secure 50 kSPS capture, low-latency data route, CPU load reduction, real-time web monitoring.
Delivers precise, lossless 50 kSPS sampling for accurate real-time insights across demanding industrial needs.
Real-time waveform dashboards provide responsive, low-latency monitoring with smooth, intuitive interaction.
M7 offloading and optimized drivers reduce CPU load while sustaining smooth, continuous real-time data flow.
Rugged automotive-grade design guaranteed reliability under heat, vibration, dust, and moisture.
If you're ready to create a high-precision, low-latency, real-time data acquisition system, this case study shows what’s possible when engineering excellence meets innovation.
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