外文翻譯--基于at89c51單片機(jī)的led顯示控制系統(tǒng)-單片機(jī)-閱讀頁
2025-06-06 07:29本頁面
【正文】 ode projected onto the and phototransistor, converted to electric signal, then input to the microcontroller RXD side, so 9 photoelectric conversion is implemented, and electrical is pletely isolated to avoid the feedback and interference which is produced by output side. IV. SOFTWARE DESIGN The entire software design mainly poses of display program and munication program. The Chinese characters to be displayed on the screen, character and other data for transmission control and display functions were achieved by dynamic scan. Real time munication parts which municate with PC receive data information by SCM serial disruption, so realtime data information transmission with PC was implemented. The host puter software was implemented by Visual Basic. In the standard serial munication, MSCOMM which is the power munication control is provided by VB, it can set the serial munication of data sent and received, and the serial munication port Status, message formats and protocols are set, directly send data by Pac’s RS 232/RS485 serial ports. In order to realized to PC reliable munication with SCM, and ensure that both sides have the same data format and baud rate, this design uses RS232 munications, a 10 bits data format, 9600bit / s baud rate. Software program posed of the beginning, initialization, display program, front, which the main Character code stored in the static memory 6264, and the SCM will wait for signal is given, that is, the input signal of SCM pin . When is from low to high, display program begin to be run. First, control words written to 8255A control port, 8255A work in the form of mode 0 in the design. After control word was finished, the data will be displayed which is transferred to the 8255A from the 6264, the display data is output for four times because the line width of the characters screen is 32, a row of data is input and transported from top to bottom each, signal of the first rows which is controlled by SCM is gated after data transmission is over, so the first column data is displayed, then call delay procedures to display the contents of the stable. the next column of data is read after delay procedures is over, and the next row is gated, so that the second column of data is also displayed, and so on, because the 10 screen size is 32 192, 192 rows are shown, and 192 rows constitute an image. Then, scanning begin from the first column, and the starting address of display data backward shift on the basis of the original, which has an address overflow issues, it will assign start address to the address pointer when the data address is overflow, the display data content will be constantly repeated. Flow chart of munication with PC and SCM is shown in Figure 10. Realtime munication parts which municate with PC receive data information by SCM serial disruption, so realtime data information transmission with PC was implemented. CONCLUSION LED display system that was designed adopted the host puter and slave structure, the host puter is PC, and municated with slave puter display system through the serial munication interface, which can implement string modification, display mode settings, time settings and other function
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