typedef enum
{
    TYPE0       = 1,
    TYPE1,    
    TYPE2,    
}TYPE;

typedef struct PARA_STRU
{
    TYPE       type;                  
    ...........

}PARA;

经上面定义后，发现枚举类型的大小为4个字节。但是我要枚举的量远少于1个字节(256种)。请问有没有办法对ENUM进行缩小的？在工程选项界面中，只找到“Enumerated types are always int”，固定为int(4个字节)!

上传的图片

  20117149451941.jpg [ 61.66 KB 636×374 ] (缩略时请点击查看原图)

 

不会这个，占位关注....

貌似没有听说过你说的这种功能，之前有代码这样用过，你看看是否对你有点帮助。

enum{
HD_DISK='1',
ADDA,
TSP,
SD_MMC,
CAN,
KBD,
DM9000,
NANDFLASH,
CMOS,
TFT_LCD='A',
USB_OTG1362,
LED,
MOTOR,
PS2_KBD,
PS2_MOUSE,
PCMCIA,
ESC='Q'
};

void select(void)
{
int i;
int in_loop = 1;
char value = ESC;
char old_value = -1;
while(in_loop)
{
  switch(value)
  {
   case HD_DISK:
    Wait_Ready();
    Data_Check(1);
    old_value = ESC;
    break;
   case PS2_MOUSE:
    if (init_flag == 0)
    {
    
     init_flag = 1;
     InitMOUSE();
    }
    mdelay(100);
    Ps_Mouse_Rec();
    break;
   case PS2_KBD:
    if (init_flag == 0)
    {
     init_flag = 1;
     Init_Platform4PS2_KBD();
    }
    mdelay(100);
    Decode();
    *pFIO_MASKA_S = 0x0020;  //允许中断
    break;
   case DM9000:
    if (init_flag == 0)
    {
     init_flag = 1;
     eth_reset();
     GetDM9000ID();
     make_test_data();
    }
    eth_send(pack,1024);
    
    break;
   case KBD:
    mdelay(1000);
    scankb();
    break;
   case ADDA:
    if (init_flag == 0)
    {
     init_flag = 1;
     ADT7516_SPISS_SELECT();
      ADT7516_SPI_init();
      ADT7516_RST();  
      ADT7516_CTL();
      ADT7516_TEST();
    }
    ADT7516_READ_REG(0x00,64,databuf);
    Printf_VDD(2,databuf);
    mdelay(10000);
    mdelay(10000);
    mdelay(10000);
      ADT7516_DA(1,0x70);
        ADT7516_DA(2,0x80);
        ADT7516_DA(3,0x90);
      ADT7516_DA(4,0xa0);
    break;
   case SD_MMC:
    if (init_flag == 0)
    {
     init_flag = 1;
     MMC_HardwareInitial();
     MMC_Init();
    }
    check_test();
    old_value = ESC;
    break;
   case NANDFLASH:
    if (init_flag == 0)
    {
     init_flag = 1;
     Init_NandFlash();
    }
    RW_Test();
    old_value = ESC;
    break;
   case CAN:
    if (init_flag == 0)
    {  
     init_flag = 1;
     MCP2515_init();
     MCP2515_RST();
     MCP2515_READ_REG(0x00,databuf,128);
     MCP2515_Init();
     MCP2515_RX0_Init();
     MCP2515_TX0((void *)0);
     *pFIO_MASKA_C = 0x0020;  
    }
    MCP2515_Send_Enable(1);
    MCP2515_Send_Disable(1);
    break;
   case CMOS:
    if (init_flag == 0)
    {
     extern volatile uint16_t *pDestAddr;
     init_flag = 1;
     Init_Platform_cmos();
      printf( "\nPlatform initialize success!\n\r" );
        Init_Po3030();
        printf( "\nPo3030 initialize success!\n\r" );
        Video_Frame_Capture( (void*) pDestAddr );
    }
    if(cmosflag ==1)
    {
     old_value = TFT_LCD;
     init_flag=0;
    }
    break;
   case TFT_LCD:
    if (init_flag == 0)
    {
     init_flag = 1;
     if(cmosflag == 0){
      gbrtorgb24();
     }
     TFT_DIS();
    }
    break;
   case TSP:
    if (init_flag == 0)
    {
     init_flag = 1;
     Init_Platform_TSP();
     ADS_SPI_Init();
     ADS_INT_Enable();
    }
    break;
   case MOTOR:
    if (init_flag == 0)
    {
     #define STEP_MOTOR_CMD 1
     #define DC_MOTOR_CMD 0
     Eable_Motor();
     init_flag = 1;
    }    
    Step_motor(STEP_MOTOR_CMD);
    DC_motor1(DC_MOTOR_CMD);
    DC_motor2(DC_MOTOR_CMD);
    break;
   case LED:
    if (init_flag == 0)
    {
     init_flag = 1;
     Init_LED_CPLD();
    }
    for(i=0;i<10;i++)
    {
     leddisplay(3,i);
     leddisplay(2,i);
     leddisplay(1,i);
     mdelay(10000);  
    }
    break;
   case USB_OTG1362:
    if (init_flag == 0)
    {
     init_flag = 1;
     usb();
    }
    if(usbflag==1)
    {
     old_value = ESC;
    }
    break;
   case PCMCIA:
    if (init_flag == 0)
    {
     Init_PCMCIAIO();
     init_flag = 1;
    }    
    Check_Pcmcia();
    mdelay(1000);
    mdelay(1000);
    break;
   case ESC:
       CloseAll();
    init_flag = 0;
    UART_puts("select test\"HD_DISK\",please press 1!\r\n");
    UART_puts("select test\"ADDA\",please press 2!\r\n");
    UART_puts("select test\"TSP\",please press 3!\r\n");
    UART_puts("select test\"SD_MMC\",please press 4!\r\n");
    UART_puts("select test\"CAN\",please press 5!\r\n");
    UART_puts("select test\"KBD\",please press 6!\r\n");
    UART_puts("select test\"DM9000\",please press 7!\r\n");
    UART_puts("select test\"NANDFLASH\",please press 8!\r\n");
    UART_puts("select test\"CMOS\",please press 9!\r\n");
    UART_puts("select test\"TFT_LCD\",please press A!\r\n");
    UART_puts("select test\"USB_OTG1362\",please press B!\r\n");
    UART_puts("select test\"LED\",please press C!\r\n");
    UART_puts("select test\"MOTOR\",please press D!\r\n");
    UART_puts("select test\"PS2_KBD\",please press E!\r\n");
    UART_puts("select test\"PS2_MOUSE\",please press F!\r\n");
    UART_puts("select test\"PCMCIA\",please press G!\r\n");
    UART_puts("\"ESCAPE\",please press Q!\r\n");
    break;      
   default:
    
    break;
  }
  
  value = UART_getc();
  if (value != -1){
  
    UART_putc(value);
    UART_puts("\r\n\r\n");
    mdelay(1000);
    old_value = value;
  }
  else{
   if (old_value != ESC)
  
    value = old_value;
  }
}
}