zynqhls定点数计算

HLS中&＃xff0c;有头文件ap_fixed.h&＃xff0c;极大的方便了我们使用定点数&＃xff0c;具体情况略。

#include
#include
typedef ap_fixed<16,8, AP_RND, AP_SAT> data_t;
data_t fixed_test(volatile data_t *src1,volatile data_t *src2,volatile data_t *dest){
#pragma HLS INTERFACE m_axi depth&＃61;100 port&＃61;src1 offset&＃61;slave bundle&＃61;MASTER_BUS1
#pragma HLS INTERFACE m_axi depth&＃61;100 port&＃61;src2 offset&＃61;slave bundle&＃61;MASTER_BUS2
#pragma HLS INTERFACE m_axi depth&＃61;100 port&＃61;dest offset&＃61;slave bundle&＃61;MASTER_BUS3
#pragma HLS INTERFACE s_axilite port&＃61;return bundle&＃61;CRTL_BUS
data_t buff1[100];
data_t buff2[100];
data_t buff3[100];
memcpy(buff1,(const data_t*)src1,10*sizeof(data_t));
memcpy(buff2,(const data_t*)src2,10*sizeof(data_t));
int i;
for(i&＃61;0;i<100;i&＃43;&＃43;){buff3[i]&＃61;buff1[i]*buff2[i];
}
memcpy((data_t*)dest,(const data_t*)buff3,10*sizeof(data_t));
return buff1[0]*buff2[0];
}

上图中&＃xff0c;data_t数据类型为16位有符号定点数&＃xff0c;其中整数位占8位&＃xff0c;AP_RND和AP_SAT分别表示舍入和溢出的设置。程序实现了读取两个16位定点数数组&＃xff0c;并且求积赋值给另一个数组的简单功能。

ps端&＃xff0c;因为没有16为定点数类型&＃xff0c;因此我们使用short类型来表示16位定点数&＃xff0c;设该定点数为a&＃xff0c;定点数小数部分8位&＃xff0c;则short b&＃61;(short)(a*(2^8))的二进制表示即为该定点数的二进制表示。PL计算结束后将结果存在dest数组中&＃xff0c;则float c&＃61;dest[i]/256.0的值就是最终结果。


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******************************************************************************//** helloworld.c: simple test application** This application configures UART 16550 to baud rate 9600.* PS7 UART (Zynq) is not initialized by this application, since* bootrom/bsp configures it to baud rate 115200** ------------------------------------------------* | UART TYPE BAUD RATE |* ------------------------------------------------* uartns550 9600* uartlite Configurable only in HW design* ps7_uart 115200 (configured by bootrom/bsp)*/#include
#include
#include "platform.h"
#include "xil_printf.h"
#include "xfixed_test_hw.h"
#include "xfixed_test.h"
#include "xil_cache.h"
int main()
{Xil_DCacheDisable();int i;short *src1&＃61;(short*)malloc(10*sizeof(short));short *src2&＃61;(short*)malloc(10*sizeof(short));short *dest&＃61;(short*)malloc(10*sizeof(short));for(i&＃61;0;i<10;i&＃43;&＃43;){src1[i]&＃61;(short)((rand()%100-50)/10.0*256);src2[i]&＃61;(short)((rand()%100-50)/10.0*256);}for(i&＃61;0;i<5;i&＃43;&＃43;)printf("%f,",(float)src1[i]/256);printf("\n");for(i&＃61;0;i<5;i&＃43;&＃43;)printf("%f,",(float)src2[i]/256);printf("\n");XFixed_test HlsXFixed_test;XFixed_test_Config *ExamplePtr;printf("Look Up the device configuration.\n");ExamplePtr &＃61; XFixed_test_LookupConfig(XPAR_FIXED_TEST_0_DEVICE_ID);if (!ExamplePtr) {printf("ERROR: Lookup of accelerator configuration failed.\n\r");return XST_FAILURE;}printf("Initialize the Device\n");long status &＃61; XFixed_test_CfgInitialize(&HlsXFixed_test, ExamplePtr);if (status !&＃61; XST_SUCCESS) {printf("ERROR: Could not initialize accelerator.\n\r");return(-1);}XFixed_test_Set_src1_V(&HlsXFixed_test,(u32)src1);XFixed_test_Set_src2_V(&HlsXFixed_test,(u32)src2);XFixed_test_Set_dest_V(&HlsXFixed_test,(u32)dest);XFixed_test_Start(&HlsXFixed_test);while (XFixed_test_IsDone(&HlsXFixed_test) &＃61;&＃61; 0);xil_printf("***********************************\n");for(i&＃61;0;i<5;i&＃43;&＃43;){printf("%f,",(float)dest[i]/256);fflush(stdout);}return 0;
}