fsync

相关函数:sync

头文件:#include <unistd.h>

定义函数:int fsync(int fd);

函数说明:fsync()负责将参数fd 所指的文件数据, 由系统缓冲区写回磁盘, 以确保数据同步.

返回值:成功则返回0, 失败返回-1, errno 为错误代码.
### MIPI FSYNC Signal in Camera Interface Synchronization In the context of camera interfaces, particularly those adhering to MIPI standards such as CSI-2 and D-PHY, synchronization plays a critical role in ensuring that data transmission between an image sensor and processor is both accurate and reliable. The Frame Sync (FSYNC) signal serves as one mechanism for achieving this synchronization. The FSYNC signal acts as a frame synchronization pulse used by some cameras or systems where external control over frame capture timing is necessary. This signal can be utilized to synchronize multiple sensors within a system or align video frames with other events outside the imaging pipeline[^1]. When discussing how FSYNC integrates into protocols like CSI-2 primarily focuses on packetized streaming of pixel data along with embedded commands through virtual channels via high-speed differential pairs defined under D-PHY specifications, certain applications may require additional signals including VSYNC (vertical sync), HREF/HSYNC (horizontal reference/sync), and indeed FSYNC for more precise control over when frames are captured relative to each other or external triggers[^4]. For implementation purposes, handling these types of synchronous operations typically involves configuring hardware registers associated with either the transmitting side (image sensor) or receiving end (application processor). In many cases, support for generating or responding to FSYNC pulses will depend upon specific capabilities provided by individual components rather than being universally standardized across all devices implementing MIPI interfaces[^3]. ```python # Example pseudo-code showing configuration related to FSYNC generation/reception def configure_fsync(sensor_config): if "fsync_support" in sensor_config: enable_fsync_output() set_fsync_polarity(sensor_config["polarity"]) else: disable_fsync_input() configure_fsync({"fsync_support": True, "polarity": "active_high"}) ``` --related questions-- 1. How does the integration of FSYNC differ between single-sensor setups versus multi-camera configurations? 2. What considerations should designers take into account regarding power consumption when using continuous vs pulsed FSYNC signaling? 3. Can you provide examples of scenarios where utilizing FSYNC significantly improves performance compared to relying solely on internal timing mechanisms within the camera module? 4. Are there any limitations imposed by particular versions of the MIPI specification concerning the use of FSYNC alongside standard CSI-2 streams?
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