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MDK 中 if 比较不正确

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 楼主| Volftooth 发表于 2012-5-30 16:40 | 显示全部楼层 |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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ayb_ice 发表于 2012-5-30 16:52 | 显示全部楼层
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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 楼主| Volftooth 发表于 2012-5-30 16:58 | 显示全部楼层
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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ayb_ice 发表于 2012-5-30 17:31 | 显示全部楼层
我试了一下，优化级别3，没有问题

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ayb_ice 发表于 2012-5-30 17:32 | 显示全部楼层
RT

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 楼主| Volftooth 发表于 2012-5-30 17:34 | 显示全部楼层
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
  1. void STM3210E_LCD_Init(void)
    

  2. { 
    

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

  4.   LCD_CtrlLinesConfig();
    


  5. 

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

  7.   LCD_FSMCConfig();
    


  8. 

  9.   Delay(5); /* delay 50 ms */
    


  10. 

  11.   /* Check if the LCD is SPFD5408B Controller */
    

  12.   if(LCD_ReadReg(0x00) == 0x5408)
    

  13.   {
    

  14.     /* Start Initial Sequence ------------------------------------------------*/
    

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

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

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

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


  19. 

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

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

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

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

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

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


  26. 

  27.     /* Power On sequence -----------------------------------------------------*/
    

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

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

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

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

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


  33. 

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

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

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

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

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

  39.     Delay(5); 
    

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

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

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

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

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


  45. 

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

  47.     LCD_WriteReg(R48, 0x0b0d);
    

  48.     LCD_WriteReg(R49, 0x1923);
    

  49.     LCD_WriteReg(R50, 0x1c26);
    

  50.     LCD_WriteReg(R51, 0x261c);
    

  51.     LCD_WriteReg(R52, 0x2419);
    

  52.     LCD_WriteReg(R53, 0x0d0b);
    

  53.     LCD_WriteReg(R54, 0x1006);
    

  54.     LCD_WriteReg(R55, 0x0610);
    

  55.     LCD_WriteReg(R56, 0x0706);
    

  56.     LCD_WriteReg(R57, 0x0304);
    

  57.     LCD_WriteReg(R58, 0x0e05);
    

  58.     LCD_WriteReg(R59, 0x0e01);
    

  59.     LCD_WriteReg(R60, 0x010e);
    

  60.     LCD_WriteReg(R61, 0x050e);
    

  61.     LCD_WriteReg(R62, 0x0403);
    

  62.     LCD_WriteReg(R63, 0x0607);
    


  63. 

  64.     /* Set GRAM area ---------------------------------------------------------*/
    

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

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

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

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


  69. 

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

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

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


  73. 

  74.     /* Partial Display Control -----------------------------------------------*/
    

  75.     LCD_WriteReg(R128, 0x0000);
    

  76.     LCD_WriteReg(R129, 0x0000);
    

  77.     LCD_WriteReg(R130, 0x0000);
    

  78.     LCD_WriteReg(R131, 0x0000);
    

  79.     LCD_WriteReg(R132, 0x0000);
    

  80.     LCD_WriteReg(R133, 0x0000);
    


  81. 

  82.     /* Panel Control ---------------------------------------------------------*/
    

  83.     LCD_WriteReg(R144, 0x0010); 
    

  84.     LCD_WriteReg(R146, 0x0000);
    

  85.     LCD_WriteReg(R147, 0x0003);
    

  86.     LCD_WriteReg(R149, 0x0110);
    

  87.     LCD_WriteReg(R151, 0x0000);
    

  88.     LCD_WriteReg(R152, 0x0000);
    


  89. 

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

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

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

  93.     LCD_WriteReg(R3, 0x1018);
    


  94. 

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


  96. 

  97.     return;
    

  98.   }
    

  99.   
    

  100. /* Start Initial Sequence ----------------------------------------------------*/
    

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

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

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

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

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

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

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

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

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

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

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

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


  113. 

  114. /* Power On sequence ---------------------------------------------------------*/
    

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


  130. 

  131. /* Adjust the Gamma Curve ----------------------------------------------------*/
    

  132.   LCD_WriteReg(R48, 0x0006);
    

  133.   LCD_WriteReg(R49, 0x0101);
    

  134.   LCD_WriteReg(R50, 0x0003);
    

  135.   LCD_WriteReg(R53, 0x0106);
    

  136.   LCD_WriteReg(R54, 0x0b02);
    

  137.   LCD_WriteReg(R55, 0x0302);
    

  138.   LCD_WriteReg(R56, 0x0707);
    

  139.   LCD_WriteReg(R57, 0x0007);
    

  140.   LCD_WriteReg(R60, 0x0600);
    

  141.   LCD_WriteReg(R61, 0x020b);
    

  142.   
    

  143. /* Set GRAM area -------------------------------------------------------------*/
    

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

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

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

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


  148. 

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

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

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


  152. 

  153. /* Partial Display Control ---------------------------------------------------*/
    

  154.   LCD_WriteReg(R128, 0x0000);
    

  155.   LCD_WriteReg(R129, 0x0000);
    

  156.   LCD_WriteReg(R130, 0x0000);
    

  157.   LCD_WriteReg(R131, 0x0000);
    

  158.   LCD_WriteReg(R132, 0x0000);
    

  159.   LCD_WriteReg(R133, 0x0000);
    


  160. 

  161. /* Panel Control -------------------------------------------------------------*/
    

  162.   LCD_WriteReg(R144, 0x0010);
    

  163.   LCD_WriteReg(R146, 0x0000);
    

  164.   LCD_WriteReg(R147, 0x0003);
    

  165.   LCD_WriteReg(R149, 0x0110);
    

  166.   LCD_WriteReg(R151, 0x0000);
    

  167.   LCD_WriteReg(R152, 0x0000);
    


  168. 

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

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

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

  172.   LCD_WriteReg(R3, 0x1018);
    


  173. 

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

  175. }
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平常人 发表于 2012-5-31 00:30 | 显示全部楼层
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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ayb_ice 发表于 2012-5-31 09:42 | 显示全部楼层
将
LCD_ReadReg
函数源代码帖出来
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