- UID
- 1062083
- 性别
- 男
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简单实现STM32 CRC32使用
使用前记得使能STM32 CRC时钟
- //STM32硬件CRC32 byte数据计算,将数据移到最高位,低位补上FF
- u32 stm32_crc32_byte(u8 *pBuff, u32 len)
- {
- u32 i;
- u8 buff[4];
- u32 *p32 = (u32 *)buff;
- CRC->CR = 1; //复位CRC寄存器
- buff[0] = buff[1] = buff[2] = buff[3] = 0XFF;
- for(i = 0;i < len;i ++)
- {
- buff[3] = pBuff;
- CRC->DR = *p32;
- }
- return CRC->DR;
- }
- //STM32硬件CRC32 u32数据计算
- u32 stm32_crc32(u32 *pBuff, u32 len)
- {
- u32 i;
- CRC->CR = 1; //复位CRC寄存器
- for(i = 0;i < len;i ++)
- {
- CRC->DR = pBuff;
- }
- return CRC->DR;
- }
- //软件CRC32 u32数据计算
- u32 crc32(u32 *ptr, u32 len)
- {
- u32 xbit;
- u32 data;
- u32 CRC32 = 0xFFFFFFFF;
- u32 bits;
- const u32 dwPolynomial = 0x04c11db7;
- u32 i;
- for(i = 0;i < len;i ++)
- {
- xbit = 1 << 31;
- data = ptr;
- for (bits = 0; bits < 32; bits++)
- {
- if (CRC32 & 0x80000000) {
- CRC32 <<= 1;
- CRC32 ^= dwPolynomial;
- }
- else
- CRC32 <<= 1;
- if (data & xbit)
- CRC32 ^= dwPolynomial;
- xbit >>= 1;
- }
- }
- return CRC32;
- }
- //软件CRC32 byte数据计算,将数据移到最高位,低位补上FF
- u32 crc32_byte(u8 *ptr, u32 len)
- {
- u32 xbit;
- u32 data;
- u32 CRC32 = 0xFFFFFFFF; //初值
- u32 bits;
- u32 i;
- u8 buff[4];
- u32 *p32 = (u32 *)buff;
- const u32 dwPolynomial = 0x04c11db7;
- buff[0] = buff[1] = buff[2] = buff[3] = 0XFF;
- for(i = 0;i < len;i ++)
- {
- xbit = 1 << 31;
- buff[3] = ptr;
- data = *p32;
- for(bits = 0; bits < 32; bits++)
- {
- if (CRC32 & 0x80000000) {
- CRC32 <<= 1;
- CRC32 ^= dwPolynomial;
- }
- else
- CRC32 <<= 1;
- if (data & xbit)
- CRC32 ^= dwPolynomial;
- xbit >>= 1;
- }
- }
- return CRC32;
- }
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