!link!: -vis On S3c2410x Delta Driver -

VIS on S3C2410X Delta Driver: Bridging Legacy Camera Interfaces to Modern Linux Frameworks

1. Introduction

The Samsung S3C2410X system-on-chip (SoC), based on the ARM920T core, remains a landmark in embedded Linux history. Among its many integrated peripherals, the Delta Driver—an often misunderstood component—plays a critical role in capturing video data from CMOS/CCD sensors via the Video Interface System (VIS).

// Request IRQ (trigger on rising clock edge) ret = request_irq(delta_irq, delta_irq_handler, IRQF_TRIGGER_RISING, "vis_delta", NULL); if (ret) goto err_irq;

For new projects, consider migrating to the S3C2440 or S3C6410, which integrate the same VIS principle but with improved Delta DMA engines. -vis On S3c2410x Delta Driver -

On commit, the driver generates 2-4 KB of delta instructions. For a static UI (e.g., a gauge needle moving 10 pixels), the bandwidth usage from SDRAM to LCD drops from 3 MB/frame to just 128 bytes. VIS on S3C2410X Delta Driver: Bridging Legacy Camera

6. Performance in Real World

Testing on a S3c2410x at 200 MHz with a 640x480 16bpp LCD: // Request IRQ (trigger on rising clock edge)