STM32中double类型转化为unsigned char数组

STM32中double类型转化为unsigned char数组：

double占64位，char占8位，所以一个double需要8个char存储：

double data = 3.1415926;
double temp = 0.0;
unsigned char buffer[8] = {0, 0};

memcpy(buffer, (unsigned char *)&data, 8);

temp = *(double *)&buffer;

printf("\r\n%lf\r\n", temp);
printf("\r\n%lf\r\n", *(double *)&buffer);

 

STM32中double类型转化为unsigned char数组