如何设置STM32生成标准CRC32

qxgroojn 于 2023-04-19 发布在其他

关注(0)|答案(6)|浏览(197)

我正在尝试用STM32L4硬件模块生成CRC。我想验证fatfs文件，所以基本上我有字节数组。我使用此CRC generator。
不幸的是，我不知道如何设置STM32L4来生成相同的结果。
配置：

hcrc.Instance = CRC;

/* The default polynomial is not used. It is required to defined it in CrcHandle.Init.GeneratingPolynomial*/
hcrc.Init.DefaultPolynomialUse    = DEFAULT_POLYNOMIAL_DISABLE;
/* Set the value of the polynomial */
hcrc.Init.GeneratingPolynomial    = 0x4C11DB7;
//hcrc.Init.GeneratingPolynomial    = 0xFB3EE248;
hcrc.Init.CRCLength= CRC_POLYLENGTH_32B;
/* The default init value is used */
/* The default init value is not used */
hcrc.Init.DefaultInitValueUse     = DEFAULT_INIT_VALUE_ENABLE;

/* User init value is used instead */
//hcrc.Init.InitValue               = 0;
hcrc.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_NONE;
//hcrc.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_BYTE;
/* The input data are inverted by word */
//hcrc.Init.InputDataInversionMode  = CRC_INPUTDATA_INVERSION_WORD;

//hcrc.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_ENABLE;
hcrc.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;
hcrc.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;
HAL_CRC_Init(&hcrc);

测试：

uint8_t test[] = {49,50,51,52};
uint32_t uwCRCValue = HAL_CRC_Calculate(&hcrc,(uint32_t *) test, 4);

结果：A695C4AA
我没有办法了。有一种方法，我成功地与它有uint32_t test[]和输入设置为hcrc.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;不幸的是，我有uint8_t。

来源：https://stackoverflow.com/questions/39646441/how-to-set-stm32-to-generate-standard-crc32

6条答案

按热度按时间

dgiusagp1#

使用CubeMX，我使用这些设置生成：

hcrc.Instance = CRC;
hcrc.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE;
hcrc.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_ENABLE;
hcrc.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_BYTE;
hcrc.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_ENABLE;
hcrc.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;

CRC计算如下：

uint32_t crc = HAL_CRC_Calculate(&hcrc, (uint32_t *)address, length);

最后反转：

crc = ~crc;

赞(0）回复(0）举报 2023-04-19

wsxa1bj12#

这对我很有效。

static CRC_HandleTypeDef hcrc = { 
    .Instance = CRC, 
    .Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE,
    .Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_ENABLE,
    .Init.CRCLength = CRC_POLYLENGTH_32B,
    .Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_NONE,
    .Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE,
    .InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES,
};

而手工方法

static const uint32_t crc_table[0x100] = {
  0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9, 0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005, 0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61, 0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD, 
  0x4C11DB70, 0x48D0C6C7, 0x4593E01E, 0x4152FDA9, 0x5F15ADAC, 0x5BD4B01B, 0x569796C2, 0x52568B75, 0x6A1936C8, 0x6ED82B7F, 0x639B0DA6, 0x675A1011, 0x791D4014, 0x7DDC5DA3, 0x709F7B7A, 0x745E66CD, 
  0x9823B6E0, 0x9CE2AB57, 0x91A18D8E, 0x95609039, 0x8B27C03C, 0x8FE6DD8B, 0x82A5FB52, 0x8664E6E5, 0xBE2B5B58, 0xBAEA46EF, 0xB7A96036, 0xB3687D81, 0xAD2F2D84, 0xA9EE3033, 0xA4AD16EA, 0xA06C0B5D, 
  0xD4326D90, 0xD0F37027, 0xDDB056FE, 0xD9714B49, 0xC7361B4C, 0xC3F706FB, 0xCEB42022, 0xCA753D95, 0xF23A8028, 0xF6FB9D9F, 0xFBB8BB46, 0xFF79A6F1, 0xE13EF6F4, 0xE5FFEB43, 0xE8BCCD9A, 0xEC7DD02D, 
  0x34867077, 0x30476DC0, 0x3D044B19, 0x39C556AE, 0x278206AB, 0x23431B1C, 0x2E003DC5, 0x2AC12072, 0x128E9DCF, 0x164F8078, 0x1B0CA6A1, 0x1FCDBB16, 0x018AEB13, 0x054BF6A4, 0x0808D07D, 0x0CC9CDCA, 
  0x7897AB07, 0x7C56B6B0, 0x71159069, 0x75D48DDE, 0x6B93DDDB, 0x6F52C06C, 0x6211E6B5, 0x66D0FB02, 0x5E9F46BF, 0x5A5E5B08, 0x571D7DD1, 0x53DC6066, 0x4D9B3063, 0x495A2DD4, 0x44190B0D, 0x40D816BA, 
  0xACA5C697, 0xA864DB20, 0xA527FDF9, 0xA1E6E04E, 0xBFA1B04B, 0xBB60ADFC, 0xB6238B25, 0xB2E29692, 0x8AAD2B2F, 0x8E6C3698, 0x832F1041, 0x87EE0DF6, 0x99A95DF3, 0x9D684044, 0x902B669D, 0x94EA7B2A, 
  0xE0B41DE7, 0xE4750050, 0xE9362689, 0xEDF73B3E, 0xF3B06B3B, 0xF771768C, 0xFA325055, 0xFEF34DE2, 0xC6BCF05F, 0xC27DEDE8, 0xCF3ECB31, 0xCBFFD686, 0xD5B88683, 0xD1799B34, 0xDC3ABDED, 0xD8FBA05A, 
  0x690CE0EE, 0x6DCDFD59, 0x608EDB80, 0x644FC637, 0x7A089632, 0x7EC98B85, 0x738AAD5C, 0x774BB0EB, 0x4F040D56, 0x4BC510E1, 0x46863638, 0x42472B8F, 0x5C007B8A, 0x58C1663D, 0x558240E4, 0x51435D53, 
  0x251D3B9E, 0x21DC2629, 0x2C9F00F0, 0x285E1D47, 0x36194D42, 0x32D850F5, 0x3F9B762C, 0x3B5A6B9B, 0x0315D626, 0x07D4CB91, 0x0A97ED48, 0x0E56F0FF, 0x1011A0FA, 0x14D0BD4D, 0x19939B94, 0x1D528623, 
  0xF12F560E, 0xF5EE4BB9, 0xF8AD6D60, 0xFC6C70D7, 0xE22B20D2, 0xE6EA3D65, 0xEBA91BBC, 0xEF68060B, 0xD727BBB6, 0xD3E6A601, 0xDEA580D8, 0xDA649D6F, 0xC423CD6A, 0xC0E2D0DD, 0xCDA1F604, 0xC960EBB3, 
  0xBD3E8D7E, 0xB9FF90C9, 0xB4BCB610, 0xB07DABA7, 0xAE3AFBA2, 0xAAFBE615, 0xA7B8C0CC, 0xA379DD7B, 0x9B3660C6, 0x9FF77D71, 0x92B45BA8, 0x9675461F, 0x8832161A, 0x8CF30BAD, 0x81B02D74, 0x857130C3, 
  0x5D8A9099, 0x594B8D2E, 0x5408ABF7, 0x50C9B640, 0x4E8EE645, 0x4A4FFBF2, 0x470CDD2B, 0x43CDC09C, 0x7B827D21, 0x7F436096, 0x7200464F, 0x76C15BF8, 0x68860BFD, 0x6C47164A, 0x61043093, 0x65C52D24, 
  0x119B4BE9, 0x155A565E, 0x18197087, 0x1CD86D30, 0x029F3D35, 0x065E2082, 0x0B1D065B, 0x0FDC1BEC, 0x3793A651, 0x3352BBE6, 0x3E119D3F, 0x3AD08088, 0x2497D08D, 0x2056CD3A, 0x2D15EBE3, 0x29D4F654, 
  0xC5A92679, 0xC1683BCE, 0xCC2B1D17, 0xC8EA00A0, 0xD6AD50A5, 0xD26C4D12, 0xDF2F6BCB, 0xDBEE767C, 0xE3A1CBC1, 0xE760D676, 0xEA23F0AF, 0xEEE2ED18, 0xF0A5BD1D, 0xF464A0AA, 0xF9278673, 0xFDE69BC4, 
  0x89B8FD09, 0x8D79E0BE, 0x803AC667, 0x84FBDBD0, 0x9ABC8BD5, 0x9E7D9662, 0x933EB0BB, 0x97FFAD0C, 0xAFB010B1, 0xAB710D06, 0xA6322BDF, 0xA2F33668, 0xBCB4666D, 0xB8757BDA, 0xB5365D03, 0xB1F740B4, 
};

uint32_t CalcCRC(uint8_t * pData, uint32_t DataLength)
{
    uint32_t Checksum = 0xFFFFFFFF;
    for(unsigned int i=0; i < DataLength; i++)
    {
        uint8_t top = (uint8_t)(Checksum >> 24);
        top ^= pData[i];
        Checksum = (Checksum << 8) ^ crc_table[top];
    }
    return Checksum;
}

赞(0）回复(0）举报 2023-04-19

ogq8wdun3#

使用下面的代码来计算cc32。CRC32计算由STM32 CRC单元是不一样的，我们的标准CRC32，它没有使用大端，它不会与0xFFFFFFFF异或。

u32 CRC32_ForBytes(u8 *pData, u32 uLen);

#define UNUSED(x) ((void)(x))

/**
 * @brief  CRC functions
 */
#define __HAL_RCC_CRC_CLK_ENABLE()   do { \
                                        __IO uint32_t tmpreg; \
                                        SET_BIT(RCC->AHBENR, RCC_AHBENR_CRCEN);\
                                        /* Delay after an RCC peripheral clock enabling */\
                                        tmpreg = READ_BIT(RCC->AHBENR, RCC_AHBENR_CRCEN);\
                                        UNUSED(tmpreg); \
                                      } while(0)

#define __HAL_RCC_CRC_CLK_DISABLE()       (RCC->AHBENR &= ~(RCC_AHBENR_CRCEN))

#define CRC32_POLYNOMIAL                        ((u32)0xEDB88320)  
#define RCC_CRC_BIT                             ((u32)0x00001000)

/**
 * @brief  Calc CRC32 for data in bytes
 * @param  pData Buffer pointer
 * @param  uLen  Buffer Length
 * @retval CRC32 Checksum
 */
u32 CRC32_ForBytes(u8 *pData,u32 uLen)  
{  
    u32 uIndex= 0,uData = 0,i;  
    uIndex = uLen >> 2;  

    __HAL_RCC_CRC_CLK_ENABLE();

    /* Reset CRC generator */  
    CRC_ResetDR();

    while(uIndex--)  
    {  
#ifdef USED_BIG_ENDIAN    
        uData = __REV((u32*)pData);  
#else
        ((u8 *)&uData)[0] = pData[0];
        ((u8 *)&uData)[1] = pData[1];
        ((u8 *)&uData)[2] = pData[2];
        ((u8 *)&uData)[3] = pData[3];
#endif        
        pData += 4;  
        uData = revbit(uData);  
        CRC->DR = uData;  
    }  
    uData = revbit(CRC->DR);  
    uIndex = uLen & 0x03;  
    while(uIndex--)  
    {  
        uData ^= (u32)*pData++;  
        for(i = 0;i < 8;i++)  
          if (uData & 0x1)  
            uData = (uData >> 1) ^ CRC32_POLYNOMIAL;  
          else  
            uData >>= 1;  
    }

    __HAL_RCC_CRC_CLK_DISABLE();

    return uData^0xFFFFFFFF;  
}

static u32 revbit(u32 uData)
{  
    u32 uRevData = 0,uIndex = 0;  
    uRevData |= ((uData >> uIndex) & 0x01);  
    for(uIndex = 1;uIndex < 32;uIndex++)  
    {  
        uRevData <<= 1;  
        uRevData |= ((uData >> uIndex) & 0x01);  
    }  
    return uRevData;  
}

像这样计算CRC32：

u32 uwCRCValue = CRC32_ForBytes(&test, 4);

赞(0）回复(0）举报 2023-04-19

zvms9eto4#

在使用外围设备时，实现应该非常简单-基本上是一个循环运行：

*(uint8_t*)&CRC->DR = buffer[i];

棘手的部分是正确设置选项（位翻转、初始值、要使用的多项式、XOR结果等）并确保以适当的数据宽度访问数据寄存器（即，指示它一次对1、2或4个字节进行操作）。https://crccalc.com/有助于显示您将获得的变化，这取决于位顺序是否颠倒，输出是否具有位XOR'd，我建议用几个任意字节测试你的实现，并将结果与该站点为相同数据生成的表进行比较。
下面是我的实现以供参考：

#include "stm32g4xx_hal.h" // change, as appropriate, for your MCU
#include <stdlib.h>

uint32_t crc32(uint8_t *buffer, size_t size) {
  // If the clock was turned on previously and kept on then it isn't necessary to do that here each time.
  // Did it here to match ST's example in AN4187 (page 8)
  // https://www.st.com/resource/en/application_note/dm00068118-using-the-crc-peripheral-in-the-stm32-family-stmicroelectronics.pdf)
  __HAL_RCC_CRC_CLK_ENABLE();
  // For standard (Ethernet) CRC-32 bit order is reversed on input and output
  CRC->CR = CRC_CR_REV_IN_0 | CRC_CR_REV_IN_1 | CRC_CR_REV_OUT;
  // The initial value and polynomial are set up during initialization.
  // Conveniently, in my case, the reset values are already correct:
  //CRC->INIT = 0xFFFFFFFF;
  //CRC->POL = 0x04C11DB7;
  CRC->CR |= CRC_CR_RESET;
  uint32_t i = 0;
  // First work on as many full 32-bit words as we can
  uint32_t full_word_bytes = size & 0b11;
  while (i < full_word_bytes) {
    CRC->DR = *(uint32_t*)&buffer[i];
    i += 4;
  }
  // Now handle any additional bytes one at a time
  while (i < size) {
    // Here we are using 8-bit access to the CRC peripheral's data register
    // so it does not introduce padding into the computation.
    // (e.g. the CRC of 4 zeros is different than for only 1)
    *(uint8_t*)&CRC->DR = buffer[i];
    i++;
  }
  // For standard (Ethernet) CRC-32 output bits need to all flip
  i = CRC->DR ^ 0xFFFFFFFF;
  __HAL_RCC_CRC_CLK_DISABLE();
  return i;
}

// Can test like this:
uint8_t crc_test_in[] = { 0x12, 0x34, 0x56, 0x78, 0x90 };
uint32_t expected_crc = 0xDC936EB1;
uint32_t crc = crc32(crc_test_in, CRC_TEST_LENGTH);
// ... print / compare ...

赞(0）回复(0）举报 2023-04-19

bvpmtnay5#

如果你想知道多项式hcrc.Init.GeneratingPolynomial和hcrc.Init.CRCLength是什么意思，这是一个小提示。在你最初的例子中，你的多项式设置将给予：

> polyviz(0x4C11DB7, 32)
x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1

如果你安装了node.js，你可以使用下面我写的函数将stm32的crc生成多项式转换为crc多项式公式...+x^2+x^1+1的形式。

function polyviz(Pol, PolyLength)
{
  var msb = 31;

  process.stdout.write(" x^"+(PolyLength));
  while (msb-- > 0)
  {
    if ((Pol & (1 << msb)))
    {
      if (msb == 0)
      process.stdout.write(" + 1");
      else
      process.stdout.write(" + x^"+(msb));
    }
  }
  process.stdout.write("\r\n");
}

// Examples from HAL_CRCEx_Polynomial_Set():
// * for a polynomial of degree 16, X^16 + X^12 + X^5 + 1 is written 0x1021 (Bin: 0001 0000 0010 0001 )
polyviz(0x1021, 16)
// * for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65 (Bin: 0110 0101)
polyviz(0x65, 7)

使用这个方法，你可以确认你是否正确地设置了你的多项式。（因为很多crc标准使用多项式表示）

赞(0）回复(0）举报 2023-04-19

sulc1iza6#

我找到了这个教程（针对STM32F746），并将其与STM32F407VGT6一起使用，
有很多IDE配置，直接访问它们可能会更好，很抱歉我没有直接在这里嵌入所有内容：
Hands-on: CRC Checksum Generation
注意：在这种情况下，要写入的文件是ROM.hex（您需要配置STM32CubeIDE才能自动执行此操作，IDE使用 *.elf文件，请参阅下面的提示）：
Some tips and solutions about this CRC usage (Windows/Linux)

赞(0）回复(0）举报 2023-04-19

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如何设置STM32生成标准CRC32

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