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MDK 中 if 比较不正确

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Volftooth|  楼主 | 2012-5-30 16:40 | 只看该作者 |只看大图 回帖奖励 |倒序浏览 |阅读模式
MDK, 代码, AD, CD, LCD
本帖最后由 Volftooth 于 2012-5-30 16:42 编辑

在 KEIL MDK 中写了这样一句代码、
if(LCD_ReadReg(0) == 0x5408)
{
....
}

但是不管是不是 5408H、都会执行 IF 里面的代码、这是怎么回事？、
看汇编代码里面并没有生成跳转的代码、
MOVS R0, #0x00
BL.W  LCD_ReadReg(0)
SUB    R1, R0, #0x5400

然后就没了啊.........
谁能解释一下子、、

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沙发
ayb_ice| | 2012-5-30 16:52 | 只看该作者
SUB    R1, R0, #0x5400

看你的汇编代码都不对，是不是对应的汇编文件都是问题

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板凳
Volftooth|  楼主 | 2012-5-30 16:58 | 只看该作者
2# ayb_ice
我把优化关掉了、可以正常判断 if、生成的汇编代码如下、
0x08006D44 2000      MOVS     r0,#0x00
0x08006D46 F7FDF95F  BL.W     LCD_ReadReg (0x08004008)
0x08006D4A F5A041A8  SUB      r1,r0,#0x5400
0x08006D4E 3908      SUBS     r1,r1,#0x08
0x08006D50 D17D      BNE      0x08006E4E


但就不知道我程序哪里让它认为可以优化了.........

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地板
ayb_ice| | 2012-5-30 17:31 | 只看该作者
我试了一下，优化级别3，没有问题

未命名.JPG (11.83 KB )

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5楼
ayb_ice| | 2012-5-30 17:32 | 只看该作者
RT

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6楼
Volftooth|  楼主 | 2012-5-30 17:34 | 只看该作者
下面是整个函数的代码、我怎么都看不出来哪里可优化、
我用 O0 级就可以、用 O3 级就不行、

复制
void STM3210E_LCD_Init(void)

{ 

/* Configure the LCD Control pins --------------------------------------------*/

  LCD_CtrlLinesConfig();



/* Configure the FSMC Parallel interface -------------------------------------*/

  LCD_FSMCConfig();



  Delay(5); /* delay 50 ms */



  /* Check if the LCD is SPFD5408B Controller */

  if(LCD_ReadReg(0x00) == 0x5408)

  {

    /* Start Initial Sequence ------------------------------------------------*/

    LCD_WriteReg(R1, 0x0100);  /* Set SS bit */

    LCD_WriteReg(R2, 0x0700);  /* Set 1 line inversion */

    LCD_WriteReg(R3, 0x1030);  /* Set GRAM write direction and BGR=1. */

    LCD_WriteReg(R4, 0x0000);  /* Resize register */



    LCD_WriteReg(R8, 0x0202);  /* Set the back porch and front porch */

    LCD_WriteReg(R9, 0x0000);  /* Set non-display area refresh cycle ISC[3:0] */

    LCD_WriteReg(R10, 0x0000); /* FMARK function */

    LCD_WriteReg(R12, 0x0000); /* RGB 18-bit System interface setting */

    LCD_WriteReg(R13, 0x0000); /* Frame marker Position */

    LCD_WriteReg(R15, 0x0000); /* RGB interface polarity, no impact */



    /* Power On sequence -----------------------------------------------------*/

    LCD_WriteReg(R16, 0x0000); /* SAP, BT[3:0], AP, DSTB, SLP, STB */

    LCD_WriteReg(R17, 0x0000); /* DC1[2:0], DC0[2:0], VC[2:0] */

    LCD_WriteReg(R18, 0x0000); /* VREG1OUT voltage */

    LCD_WriteReg(R19, 0x0000); /* VDV[4:0] for VCOM amplitude */

    Delay(20);                 /* Dis-charge capacitor power voltage (200ms) */



    LCD_WriteReg(R17, 0x0007);        /* DC1[2:0], DC0[2:0], VC[2:0] */

    Delay(5);                   /* Delay 50 ms */

    LCD_WriteReg(R16, 0x12B0);        /* SAP, BT[3:0], AP, DSTB, SLP, STB */

    Delay(5);                        /* Delay 50 ms */

    LCD_WriteReg(R18, 0x01BD);  /* External reference voltage= Vci */

    Delay(5); 

    LCD_WriteReg(R19, 0x1400);  /* VDV[4:0] for VCOM amplitude */

    LCD_WriteReg(R41, 0x000E);  /* VCM[4:0] for VCOMH */

    Delay(5);                   /* Delay 50 ms */

    LCD_WriteReg(R32, 0x0000); /* GRAM horizontal Address */

    LCD_WriteReg(R33, 0x013F); /* GRAM Vertical Address */



    /* Adjust the Gamma Curve (SPFD5408B)-------------------------------------*/

    LCD_WriteReg(R48, 0x0b0d);

    LCD_WriteReg(R49, 0x1923);

    LCD_WriteReg(R50, 0x1c26);

    LCD_WriteReg(R51, 0x261c);

    LCD_WriteReg(R52, 0x2419);

    LCD_WriteReg(R53, 0x0d0b);

    LCD_WriteReg(R54, 0x1006);

    LCD_WriteReg(R55, 0x0610);

    LCD_WriteReg(R56, 0x0706);

    LCD_WriteReg(R57, 0x0304);

    LCD_WriteReg(R58, 0x0e05);

    LCD_WriteReg(R59, 0x0e01);

    LCD_WriteReg(R60, 0x010e);

    LCD_WriteReg(R61, 0x050e);

    LCD_WriteReg(R62, 0x0403);

    LCD_WriteReg(R63, 0x0607);



    /* Set GRAM area ---------------------------------------------------------*/

    LCD_WriteReg(R80, 0x0000); /* Horizontal GRAM Start Address */

    LCD_WriteReg(R81, 0x00EF); /* Horizontal GRAM End Address */

    LCD_WriteReg(R82, 0x0000); /* Vertical GRAM Start Address */

    LCD_WriteReg(R83, 0x013F); /* Vertical GRAM End Address */



    LCD_WriteReg(R96,  0xA700); /* Gate Scan Line */

    LCD_WriteReg(R97,  0x0001); /* NDL, VLE, REV */

    LCD_WriteReg(R106, 0x0000); /* set scrolling line */



    /* Partial Display Control -----------------------------------------------*/

    LCD_WriteReg(R128, 0x0000);

    LCD_WriteReg(R129, 0x0000);

    LCD_WriteReg(R130, 0x0000);

    LCD_WriteReg(R131, 0x0000);

    LCD_WriteReg(R132, 0x0000);

    LCD_WriteReg(R133, 0x0000);



    /* Panel Control ---------------------------------------------------------*/

    LCD_WriteReg(R144, 0x0010); 

    LCD_WriteReg(R146, 0x0000);

    LCD_WriteReg(R147, 0x0003);

    LCD_WriteReg(R149, 0x0110);

    LCD_WriteReg(R151, 0x0000);

    LCD_WriteReg(R152, 0x0000);



    /* Set GRAM write direction and BGR=1

       I/D=01 (Horizontal : increment, Vertical : decrement)

       AM=1 (address is updated in vertical writing direction) */

    LCD_WriteReg(R3, 0x1018);



    LCD_WriteReg(R7, 0x0112); /* 262K color and display ON */



    return;

  }

  

/* Start Initial Sequence ----------------------------------------------------*/

  LCD_WriteReg(R229,0x8000); /* Set the internal vcore voltage */

  LCD_WriteReg(R0,  0x0001); /* Start internal OSC. */

  LCD_WriteReg(R1,  0x0100); /* set SS and SM bit */

  LCD_WriteReg(R2,  0x0700); /* set 1 line inversion */

  LCD_WriteReg(R3,  0x1030); /* set GRAM write direction and BGR=1. */

  LCD_WriteReg(R4,  0x0000); /* Resize register */

  LCD_WriteReg(R8,  0x0202); /* set the back porch and front porch */

  LCD_WriteReg(R9,  0x0000); /* set non-display area refresh cycle ISC[3:0] */

  LCD_WriteReg(R10, 0x0000); /* FMARK function */

  LCD_WriteReg(R12, 0x0000); /* RGB interface setting */

  LCD_WriteReg(R13, 0x0000); /* Frame marker Position */

  LCD_WriteReg(R15, 0x0000); /* RGB interface polarity */



/* Power On sequence ---------------------------------------------------------*/

  LCD_WriteReg(R16, 0x0000); /* SAP, BT[3:0], AP, DSTB, SLP, STB */

  LCD_WriteReg(R17, 0x0000); /* DC1[2:0], DC0[2:0], VC[2:0] */

  LCD_WriteReg(R18, 0x0000); /* VREG1OUT voltage */

  LCD_WriteReg(R19, 0x0000); /* VDV[4:0] for VCOM amplitude */

  Delay(20);                 /* Dis-charge capacitor power voltage (200ms) */

  LCD_WriteReg(R16, 0x17B0); /* SAP, BT[3:0], AP, DSTB, SLP, STB */

  LCD_WriteReg(R17, 0x0137); /* DC1[2:0], DC0[2:0], VC[2:0] */

  Delay(5);                  /* Delay 50 ms */

  LCD_WriteReg(R18, 0x0139); /* VREG1OUT voltage */

  Delay(5);                  /* Delay 50 ms */

  LCD_WriteReg(R19, 0x1d00); /* VDV[4:0] for VCOM amplitude */

  LCD_WriteReg(R41, 0x0013); /* VCM[4:0] for VCOMH */

  Delay(5);                  /* Delay 50 ms */

  LCD_WriteReg(R32, 0x0000); /* GRAM horizontal Address */

  LCD_WriteReg(R33, 0x0000); /* GRAM Vertical Address */



/* Adjust the Gamma Curve ----------------------------------------------------*/

  LCD_WriteReg(R48, 0x0006);

  LCD_WriteReg(R49, 0x0101);

  LCD_WriteReg(R50, 0x0003);

  LCD_WriteReg(R53, 0x0106);

  LCD_WriteReg(R54, 0x0b02);

  LCD_WriteReg(R55, 0x0302);

  LCD_WriteReg(R56, 0x0707);

  LCD_WriteReg(R57, 0x0007);

  LCD_WriteReg(R60, 0x0600);

  LCD_WriteReg(R61, 0x020b);

  

/* Set GRAM area -------------------------------------------------------------*/

  LCD_WriteReg(R80, 0x0000); /* Horizontal GRAM Start Address */

  LCD_WriteReg(R81, 0x00EF); /* Horizontal GRAM End Address */

  LCD_WriteReg(R82, 0x0000); /* Vertical GRAM Start Address */

  LCD_WriteReg(R83, 0x013F); /* Vertical GRAM End Address */



  LCD_WriteReg(R96,  0x2700); /* Gate Scan Line */

  LCD_WriteReg(R97,  0x0001); /* NDL,VLE, REV */

  LCD_WriteReg(R106, 0x0000); /* set scrolling line */



/* Partial Display Control ---------------------------------------------------*/

  LCD_WriteReg(R128, 0x0000);

  LCD_WriteReg(R129, 0x0000);

  LCD_WriteReg(R130, 0x0000);

  LCD_WriteReg(R131, 0x0000);

  LCD_WriteReg(R132, 0x0000);

  LCD_WriteReg(R133, 0x0000);



/* Panel Control -------------------------------------------------------------*/

  LCD_WriteReg(R144, 0x0010);

  LCD_WriteReg(R146, 0x0000);

  LCD_WriteReg(R147, 0x0003);

  LCD_WriteReg(R149, 0x0110);

  LCD_WriteReg(R151, 0x0000);

  LCD_WriteReg(R152, 0x0000);



  /* Set GRAM write direction and BGR = 1 */

  /* I/D=01 (Horizontal : increment, Vertical : decrement) */

  /* AM=1 (address is updated in vertical writing direction) */

  LCD_WriteReg(R3, 0x1018);



  LCD_WriteReg(R7, 0x0173); /* 262K color and display ON */  

}

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7楼
平常人| | 2012-5-31 00:30 | 只看该作者
看不到定义，怀疑是LCD_ReadReg函数类型的问题，与比较对象不匹配。

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8楼
ayb_ice| | 2012-5-31 09:42 | 只看该作者
将
LCD_ReadReg
函数源代码帖出来

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