C 数值类型与字节数组相互转化
C 数据类型与字节数组相互转化
uint16_t -> bytes
uint8_t uint16_t2bytes(uint8_t* buffer, uint16_t data)
{
if(buffer == NULL) return 0;
uint16_t tmp2byte = data;
*buffer = (tmp2byte & 0xff00) >> 8;
*(++buffer) = tmp2byte & 0x00ff;
return 2;
}
bytes -> uint16_t
uint8_t bytes2uint16_t(uint8_t* buffer, uint16_t* data)
{
if(buffer == NULL) return 0;
*data = (*buffer << 8) + *(buffer + 1);
return 2;
}
double -> bytes
uint8_t double2bytes(uint8_t* buffer, double data)
{
if(buffer == NULL) return 0;
uint8_t i = 0;
uint8_t* p = (uint8_t*)&data;
for(i = 0; i < 8; ++i) {
*(buffer + i) = *p++;
}
return 8;
}
bytes -> double
uint8_t bytes2double(uint8_t* buffer, double* data)
{
if(buffer == NULL) return 0;
*data = *((double *)buffer);
return 8;
}