基于多端口串行Flash的超长条形LED显示屏控制

摘要

为了不增加硬件成本而提高显示数据的输出速度,在分析现有条形LED显示屏单元板电路的基础上,提出了一种基于多端口串行Flash存储器的LED显示控制系统,该系统由STC12C5616高速1T单片机和带SPI接口的SST26VF016B串行多端口Flash存储器组成.显示数据输出时,利用单片机的高速同步串行口(SPI)高速时钟,将多端口串行Flash存储器中的显示数据以“存储器直接存取(DMA)”的方式直接输出至超长条形LED显示屏.最后,以4096X64点阵单色LED显示屏为例进行了测试.结果表明,显示屏刷新率达到62.5 Hz,验证了该系统在实际应用中的有效性和可行性.%In order to increase the display data output rate with the same system cost, an LED display control system based on multiport serial flash was proposed through analyzing the cell boards of the existing bar LED display panels. The system consists of high-speed IT MCU (micro control unit) of STC12C5616 and multiport serial flash of SST26VFD16B with serial peripheral interface (SPI). Based on the SPI high-speed clock of the MCU, the display data in the multi-port serial flash memory is directly sent to a superlong bar LED display panel by the way of " direct memory access ( DMA) ". Finally, by taking a 4 096 x 64 monochromatic dot-matrix LED display as an example, the proposed control system was tested. The tested result shows that the display refresh rate is up to 62.5 Hz, and the effectiveness and feasibility of the proposed system are validated.