Efficient downlink data transmission method for upper computer

Abstract

The invention discloses an efficient downlink data transmission method for an upper computer. The method comprises the following steps that: an upper computer initializes a memory allocation structureand writes initialized related information into lower-layer equipment; the upper computer and the lower-layer equipment establish circular queues with depths of M and N for storing corresponding information respectively; during data transmission, upper computer software copies to-be-transmitted data into the c-th sub-block of the large memory block with the serial number a, then the serial numbera, the serial number c and the data length L are integrated into a numerical value R, and the numerical value R is written to lower-layer equipment in a register writing mode; and the lower-layer equipment obtains a physical address ADDR of data storage through calculation, and then initiates DMA operation to obtain data according to the data length L analyzed from the integrated value R. The method provided by the invention has a relatively simple processing flow, relatively sound cross-system portability and relatively high transmission efficiency.

Description

technical field [0001] The invention describes a method for efficiently transmitting data from an upper computer to a lower-layer device. The method has relatively simple processing flow, better cross-system portability and higher transmission efficiency. Background technique [0002] When the upper computer transmits data to the lower device, the common method is to write registers or DMA transfer. The efficiency of writing registers is low and cannot meet the needs of high-speed data transmission. There are two ways for DMA transfer. One is that the upper computer calls the system interface function actively To initiate a DMA operation, the other is that the upper computer informs the lower-layer device of the data physical address and length information transmitted by DMA, and the lower-layer device initiates the DMA operation. Regardless of the DMA method, it is necessary to consider the confirmation of the completion of the DMA data transfer and the multiplexing of the ...

AI Technical Summary

Problems solved by technology

[0002] When the upper computer transmits data to the lower device, the common method is to write registers or DMA transfer. The efficiency of writing registers is low and cannot meet the needs of high-speed data transmission. There are two ways for DMA transfer. One is that the upper computer calls the system interface function actively Initiate DMA operation, the other is that the upper computer informs the lower device of the physical address and length of the data transferred by DMA, and the lower device initiates the DMA operation

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