STM32H7使用函数SCB_InvalidateDCache_by_Addr，SCB_CleanDCache_by_Addr等函数注意事项

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电梯直达

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第8号打板工|

楼主 | 2018-8-10 11:26 | 只看该作者回帖奖励

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ADDR, dc, 函数, STM32H7, AN

特别注意下面这三个函数的形参addr和dsize：

addr ：操作的地址一定要是32字节对齐的。

dsize ：一定要是32字节的整数倍

/**
  rief D-Cache Invalidate by address
  details Invalidates D-Cache for the given address
  param[in] addr address (aligned to 32-byte boundary)
  param[in] dsize size of memory block (in number of bytes)
*/
__STATIC_INLINE void SCB_InvalidateDCache_by_Addr (uint32_t *addr, int32_t dsize)
{
  #if defined (__DCACHE_PRESENT) && (__DCACHE_PRESENT == 1U)
   int32_t op_size = dsize;
uint32_t op_addr = (uint32_t)addr;
   int32_t linesize = 32;             /* in Cortex-M7 size of cache line is fixed to 8 words (32 bytes) */

__DSB();

while (op_size > 0) {
   SCB->DCIMVAC = op_addr;
   op_addr += (uint32_t)linesize;
   op_size -=          linesize;
}

__DSB();
__ISB();
  #endif
}

/**
  rief D-Cache Clean by address
  details Cleans D-Cache for the given address
  param[in] addr address (aligned to 32-byte boundary)
  param[in] dsize size of memory block (in number of bytes)
*/
__STATIC_INLINE void SCB_CleanDCache_by_Addr (uint32_t *addr, int32_t dsize)
{
  #if defined (__DCACHE_PRESENT) && (__DCACHE_PRESENT == 1U)
   int32_t op_size = dsize;
uint32_t op_addr = (uint32_t) addr;
   int32_t linesize = 32;             /* in Cortex-M7 size of cache line is fixed to 8 words (32 bytes) */

__DSB();

while (op_size > 0) {
   SCB->DCCMVAC = op_addr;
   op_addr += (uint32_t)linesize;
   op_size -=          linesize;
}

__DSB();
__ISB();
  #endif
}

/**
  rief D-Cache Clean and Invalidate by address
  details Cleans and invalidates D_Cache for the given address
  param[in] addr address (aligned to 32-byte boundary)
  param[in] dsize size of memory block (in number of bytes)
*/
__STATIC_INLINE void SCB_CleanInvalidateDCache_by_Addr (uint32_t *addr, int32_t dsize)
{
  #if defined (__DCACHE_PRESENT) && (__DCACHE_PRESENT == 1U)
   int32_t op_size = dsize;
uint32_t op_addr = (uint32_t) addr;
   int32_t linesize = 32;             /* in Cortex-M7 size of cache line is fixed to 8 words (32 bytes) */

__DSB();

while (op_size > 0) {
   SCB->DCCIMVAC = op_addr;
   op_addr += (uint32_t)linesize;
   op_size -=          linesize;
}

__DSB();
__ISB();
  #endif
}

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STM32H7使用函数SCB_InvalidateDCache_by_Addr，SCB_CleanDCache_by_Addr等函数注意事项

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