-vis On S3c2410x Delta Driver - May 2026

// 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;

Introduction The Samsung S3C2410X is a legendary 16/32-bit RISC microcontroller based on the ARM920T core. Despite its age (released in the early 2000s), it remains a cornerstone for embedded systems education (e.g., the popular QQ2440, Mini2440 boards) and legacy industrial control devices. One of the most challenging aspects of working with this SoC is interfacing non-standard peripherals, particularly those referred to under the codename -vis and its accompanying Delta signal conditioning interface. -vis On S3c2410x Delta Driver -

printk(KERN_INFO "vis Delta driver loaded on S3C2410X\n"); return 0; err_irq: gpio_free(delta_data_pin); return ret; // Request IRQ (trigger on rising clock edge)

When the user touches the Delta touch panel (differential measurement), the driver computes the X/Y coordinates. It then uses the S3C2410_LCDCON registers to dynamically adjust the TIMEVAL (vertical sync) or the MVAL (inversion signal) to reduce flicker. = OSR) vis-&gt

if (bit_count >= OSR) vis->delta_sigma_samples[current_index++] = accum / OSR; if (current_index >= BUFFER_SIZE) wake_up_interruptible(&vis->wait); accum = 0; bit_count = 0;