cache_coherency.c

/* 32-byte alignment buffer for cache coherency operations. BUFF_SIZE is a 32-bytes multiple. */
uint8_t pBuff[BUFF_SIZE] __attribute__ ((aligned (32)));

 
/* Write data to main memory with DMA */ 
fancy_dma_operation(pBuff);


/* Make subsequent CPU reads coherent with DMA writes to main memory */
SCB_InvalidateDCache_by_Addr((uint32_t *)pBuff, BUFF_SIZE);

 
/* Read/write data with CPU to a cached memory region */ 
fancy_cpu_operation(pBuff);


/* Make subsequent DMA reads coherent with DMA reads to main memory */
SCB_CleanDCache_by_Addr((uint32_t *)pBuff, BUFF_SIZE);