Multi-channel signal processing heterogeneous microsystem based on FPGA and Application Processor

For multi-channel signals with a wide range of amplitude and frequency, a real-time, high-speed digital heterogeneous microsystem is proposed in this work based on FPGA and application processor, with both time and frequency domain processing capabilities, while the size is only 16.2cm *14.4cm. The system can provide real-time time and frequency domain data to the application processor unit(APU) in the form of interruption or query. The system uses serial peripheral interface(SPI) to communicate with analog-to-digital converter(ADC) and enhanced local bus controller(eLBC) to communicate with APU to achieve high-speed data transmission between different modules. Windowing fast Fourier transform(FFT) is used in this system, which improves the accuracy of the single frequency signal. A specially designed ping-pong buffer is used in the system so that the data can be accessed by the APU at any time. The file system acceleration is proposed to speed up data storage. The system can achieve real-time, high-speed multi-channel discrete signal common mode detection and DC blocking, preprocessing, windowing FFT, data storage. Experimental results show the bandwidth between FPGA and APU can reach 66Mb/s. And files writing speed can reach 1.07MB/s. For signals in the range of 100HZ~9 KHz, the acquiring and processing error is within 4.5%.