PMBUS_data_to_linear11数据转化.zip

#include <stdio.h> //定义linear11结构体类型 typedef struct { union { //此处也可为short linear11，有的地方int为双字节，不必加short; short int linear11; //小端在数组前 unsigned char linear11buf[2]; struct { short int linear11Y :11; short int linear11N :5 ; }; }; }LINEAR11; //浮点数转化为linear11格式 void data_to_linear11(float linear_f,LINEAR11 *linear) { float f_data_temp=linear_f; char cnt = 0; if(f_data_temp>1023.0f || f_data_temp<-1024.0f) { while(f_data_temp>1023.0f || f_data_temp<-1024.0f) { f_data_temp /= 2.0f; cnt += 1; if(cnt>=15) { break; } } } else if(f_data_temp>-512.0f && f_data_temp<512.0f) { while(f_data_temp>-512.0f && f_data_temp<512.0f) { f_data_temp *= 2.0f; cnt -= 1; if(cnt<=-16) { break; } } } else { ; } linear->linear11N = cnt; linear->linear11Y = (int)f_data_temp; } //定义linear11形式变量 LINEAR11 linear11test; float f_data; int main(void) { printf("编译器 short int 类型字节长度 = %d:\r\n\r\n",sizeof(short int)); printf("编译器 short 类型字节长度 = %d:\r\n\r\n",sizeof(short)); //应用时传递浮点数与结构体指针，将浮点数转化为linear11数据格式数组 f_data = 1.27f; data_to_linear11(f_data,&linear11test); printf("linear11 = %x:\r\n\r\n",linear11test.linear11); printf("f_data = %f:\r\n\r\n",f_data); printf("linear11test.linear11buf[0] = 0x%02x\r\n",linear11test.linear11buf[0]); printf("linear11test.linear11buf[1] = 0x%02x\r\n",linear11test.linear11buf[1]); return 0; }