Based on the contradiction between the large data throughput and high motion control accuracy of the new space payload and low power consumption and light weight, a DSP chip with an internal DMA controller and a FreeRAM FPGA device were used to build a controller platform, and an AQBISS interface electric field encoder was used as a position feedback element, and a test prototype was developed. The performance test results of the prototype show that the CPU occupancy rate is reduced to 20% by using the DSP on-chip DMA controller to read data from the FPGA on-chip FIFO; the MxN sorting search algorithm is used to calculate the absolute position of the encoder, and the encoder measurement accuracy reaches the level of a 16-bit photoelectric encoder. Keywords: payload controller, DSP, FPGA, electric field encoder, AQBISS Abstract: Future space payload required that controller should have more faster data-through, more higher movement control precise, more lower power and more smaller size than ever. To solve the problem, a new type controller was devised based on DSP with built-in DMA controller and FPGA containing FreeRAM in this paper, moreover, we used AQBISS interface electric field encoder as position feed-back component, then developed prototype. The performance test indicates that CPU overhead is reduced to twenty percent by reading data through DSP\'s inner DMA controller and FIFO built-in FPGA, the resolution of electric rotary encoder equals to opto-electric encoder with sixteen bits by using the MxN order search algorithm.Keywords: payload controller, DSP, FPGA, electric field encoder, AQBISS
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