M453的CRC模块计算CRC-16/MODBUS设置的问题请教 - 牛卧堂MCU技术交流

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本帖最后由 bsp0321 于 2015-12-9 11:18 编辑

CRC-16: X16 + X15 + X2 + 1，我设置

CRC_CTL = ？和

CRC_SEED = ？能够计算出485标准modbus的校验值。

我试验数据如下

捕获.PNG (23.25 KB, 下载次数: 342)

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2015-12-9 11:11 上传

以下是我试验的代码，几乎把所有的情况试了一遍，都没有出来，请教一下。

typedef struct Crc_Config_S
{
uint8_t crcmode;
/*
This field indicates the CRC operation polynomial mode
0 = CRC-CCITT Polynomial mode.
1 = CRC-8 Polynomial mode.
2 = CRC-16 Polynomial mode.
3 = CRC-32 Polynomial mode.*/
uint8_t datlen;
/*
This field indicates the write data length.
0 = Data length is 8-bit mode.
1 = Data length is 16-bit mode.
2 = Data length is 32-bit mode.*/
uint8_t chksfmt;
/*This bit is used to enable the 1’s complement function for checksum result in CRC_CHECKSUM register
0 = 1’s complement for CRC checksum Disabled.
1 = 1’s complement for CRC checksum Enabled.
*/
uint8_t datfmt;
/*This bit is used to enable the 1’s complement function for write data value in CRC_DAT register.
0 = 1’s complement for CRC writes data in Disabled.
1 = 1’s complement for CRC writes data in Enabled.*/
uint8_t chksrev;
/*
This bit is used to enable the bit order reverse function for write data value in CRC_CHECKSUM register.
0 = Bit order reverse for CRC checksum Disabled.
1 = Bit order reverse for CRC checksum Enabled.
*/
uint8_t datrev;
/*
This bit is used to enable the bit order reverse function for write data value in CRC_DAT register.
0 = Bit order reversed for CRC write data in Disabled.
1 = Bit order reversed for CRC write data in Enabled (per byte).*/
uint32_t seed;

}Crc_Config;

void Bsp_Crc_Config(Crc_Config Conf)
{
   CRC->CTL |= (Conf.crcmode<<CRC_CTL_CRCMODE_Pos)|(Conf.datlen<<CRC_CTL_DATLEN_Pos)|(Conf.chksfmt<<CRC_CTL_CHKSFMT_Pos)|(Conf.datfmt<<CRC_CTL_DATFMT_Pos)|(Conf.chksrev<<CRC_CTL_CHKSREV_Pos)|(Conf.datrev<<CRC_CTL_DATREV_Pos);
   CRC->SEED = Conf.seed;
}

void Bsp_Crc_Module_Enable(void)
{
CLK_EnableModuleClock(CRC_MODULE);
CRC->CTL = 1;
}

void Bsp_Crc_Module_Disable(void)
{
CLK_DisableModuleClock(CRC_MODULE);
}

void Bsp_Crc_Controller_Reset(void)
{
SYS_UnlockReg();
SYS->IPRST0 |= 0x80;
SYS->IPRST0 &= ~(0x80);
SYS_LockReg();
}

int main()
{
Crc_Config Conf;
uint32_t res = 0;
uint8_t a[8] = {0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38};
uint8_t *b = (uint8_t *)a;
uint32_t i,i1,i2,i3,i4,i5;

/* Unlock protected registers */
SYS_UnlockReg();

SYS_Init();

/* Lock protected registers */
SYS_LockReg();

Conf.crcmode = 2;
Conf.datlen = 1;

for(i1 = 0;i1<2;i1++)
{
      if(i1 == 0)    Conf.seed = 0;
      else          Conf.seed = 0xFFFF;
      for(i2 = 0;i2<2;i2++)
      {
         Conf.chksfmt = i2;
         for(i3 = 0;i3<2;i3++)
         {
               Conf.chksrev = i3;
               for(i4 = 0;i4<2;i4++)
               {
                     Conf.datfmt = i4;
                     for(i5 = 0;i5<2;i5++)
                     {
                           Conf.datrev = i5;
                           {
                                 Bsp_Crc_Controller_Reset();
                                 Bsp_Crc_Module_Enable();
                                 Bsp_Crc_Config(Conf);

                                 for(i = 0;i<8;i++)
                                 {
                                    CRC->DAT = a;
                                 }
                                 res = CRC_GetChecksum();
                                 Bsp_Crc_Module_Disable();
                           }
                     }
               }
         }
      }
}

do
{

}
while(1);

}

作者: bsp0321 时间: 2015-12-9 11:16
本帖最后由 bsp0321 于 2015-12-9 11:21 编辑

上面源代码中
CRC->DAT = a方括号内i;这里不知道为啥不显示方括号

作者: chhuang16 时间: 2015-12-10 11:19

CRC設定上開這兩個
CRC_WDATA_RVS
CRC_CHECKSUM_RVS
就可以跑出0x37DD的數值了

程式都幫你寫好了，你試看看吧
int main()
{
const uint8_t acCRCSrcPattern[] = {0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38};
uint32_t i,u32TargetChecksum = 0x37DD, u32CalChecksum = 0;

/* Unlock protected registers */
SYS_UnlockReg();

SYS_Init();

/* Lock protected registers */
SYS_LockReg();

/* Init UART0 to 115200-8n1 for print message */
UART_Open(UART0, 115200);

Bsp_Crc_Controller_Reset();
Bsp_Crc_Module_Enable();
CRC_Open(CRC_16, CRC_WDATA_RVS|CRC_CHECKSUM_RVS, 0xFFFF, CRC_CPU_WDATA_8);
for(i = 0; i < sizeof(acCRCSrcPattern); i++)
{
CRC_WRITE_DATA((acCRCSrcPattern[i] & 0xFF));
}

/* Get CRC-8 checksum value */
u32CalChecksum = CRC_GetChecksum();
printf("CRC checksum is 0x%X ... %s.\n", u32CalChecksum, (u32CalChecksum == u32TargetChecksum) ? "PASS" : "FAIL");

while(1);

}

作者: bsp0321 时间: 2015-12-16 14:42
我试试，谢谢，出差好久没有来了

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