【C/C++】uin8_t uint16_t uint32_t相互转换

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1. uint8_t 转uint16_t

    uint8_t u8[4] = {
    
    0x12,0x34,0x56,0x78};
    uint16_t u16[2] = {
    
    0};
    
	u16[0] = (u8[1] << 8) + u8[0];
    u16[1] = (u8[3] << 8) + u8[2];

2. uint8_t 转uint32_t

	uint8_t u8[4] ={
    
    0x12,0x34,0x56,0x78};
	uint32_t u32 = 0;
	
    u32 = (u8[3] << 24) + (u8[2] << 16) + (u8[1] << 8) + u8[0];
    

3. uint16_t 转uint8_t

    uint8_t u8[4] = {
    
    0};
    uint16_t u16[2] = {
    
    0x3412,0x7856};

    u8[0] = u16[0] & 0xFF;
    u8[1] = (u16[0] >> 8) & 0xFF;
    u8[2] = u16[1] & 0xFF;
    u8[3] = (u16[1] >> 8) & 0xFF;

4. uint16_t 转uint32_t

    uint16_t u16[2] = {
    
    0x1234,0x5678};
	uint32_t u32 = 0;  
	  
	u32 = (u16[1] << 16) + u16[0];
	

5. uint32_t 转uint8_t

	uint8_t u8[4] ={
    
    0};
	uint32_t u32 = 0x78563412;
	
    u8[0] = u32 & 0xFF;
    u8[1] = (u32 >> 8) & 0xFF;
    u8[2] = (u32 >> 16) & 0xFF;
    u8[3] = (u32 >> 24) & 0xFF;

6. uint32_t 转uint16_t

	uint8_t u16[2] ={
    
    0};
	uint32_t u32 = 0x56781234;
	
    u16[0] = u32 & 0xFFFF;
    u16[1] = (u32 >> 16) & 0xFFFF;