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Hi，@Niță Eduard.Thanks for the suggestion, now I have solved the problem. My problem is that some local variables are not initialized when writing code in HLS. As a beginner, I didn't realize this. Now I found it and solved it successfully. Thanks also for the advice!

Sure, here are some of the codes lenet.cpp lenet.h

Hello, I am writing code in Vivado SDK 2018.3 to drive the IP core generated by HLS to realize handwritten digit recognition. Now there is no problem with the result of a single call, but the first result is correct and the subsequent results are wrong when the loop is called multiple times. For example, I recognize the number 0 now, and he is correct. But I recognize multiple pictures in a row, only the first result is correct, and the other results are all wrong, and I need to reprogram the fpga to recognize it correctly. I have checked the input and tested each image individually, and they are all right. What may be the reason? Here are part of my codes: // 10 * 28 * 28 imgs float img[10][784]={ #include "./data/0_0.h" #include "./data/1_0.h" #include "./data/2_0.h" #include "./data/3_0.h" #include "./data/4_0.h" #include "./data/5_0.h" #include "./data/6_0.h" #include "./data/7_0.h" #include "./data/8_0.h" #include "./data/9_0.h" }; int main() { init_platform(); Xil_DCacheDisable(); //========= Initialize IP================= XMylenet mylenet; XMylenet_Initialize(&mylenet,XPAR_MYLENET_0_DEVICE_ID); for (int set = 0; set < 10; set++){ //========= input ================= int *img_fixed =(int*)malloc(784*sizeof(int)); int *out =(int*)malloc(10*sizeof(int)); for(int i = 0; i < 784; i++) img_fixed[i] = 0; for (int i = 0; i < 10; i++) out[i] = 0; for(int i=0;i<784;i++) img_fixed[i] = img[set][i]*65536; //========= set IP input output ================= XMylenet_Set_img_in_V(&mylenet,img_fixed); XMylenet_Set_out_V(&mylenet,out); //========== start IP ============= XMylenet_Start(&mylenet); while(XMylenet_IsDone(&mylenet)==0); //========== print result ============= int max = 0; int max_index; for(int i=0;i<10;i++){ float tmp = (float)out[i]/65536.0f; printf("number %d predicted out: %f\n", i, tmp); if(tmp>max){ max_index = i; max = tmp; } } printf("lenet predict out: %d label: %d\n",max_index, set); free(img_fixed); free(out); } cleanup_platform(); return 0; }