701 PSRAM 常见接口

📎 原始文档：https://www.kdocs.cn/l/cknCFtBNSHIj 701 PSRAM 常见接口

  1. 配置

701 芯片A6s 和A7s 带内置psram ,TCFG_PSRAM_DEV_ENABLE 打开 ， 默认配置128Mhz 即可
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  1. 常见接口

（1） 参考原本sdk psram_api.h 中的用法

extern void *malloc_psram(size_t size);    
 extern void free_psram(void *pv);

（2）psram的realloc

#define portBYTE_ALIGNMENT                4
#define portBYTE_ALIGNMENT_MASK        ( 0x0003 )

#define HEAP_SANITY_CHECK   1

typedef struct A_BLOCK_LINK {
#if (HEAP_SANITY_CHECK)
    int magic_a;
#endif
    struct A_BLOCK_LINK *pxNextFreeBlock;  /*<< The next free block in the list. */
    size_t xBlockSize;                     /*<< The size of the free block. */
#if (HEAP_SANITY_CHECK)
    int magic_b;
#endif
} BlockLink_t;


/* The size of the structure placed at the beginning of each allocated memory
block must by correctly byte aligned. */
static const size_t xHeapStructSize        = (sizeof(BlockLink_t) + ((size_t)(portBYTE_ALIGNMENT - 1))) & ~((size_t) portBYTE_ALIGNMENT_MASK);

static const size_t xHeapUsedStructSize        = (sizeof(BlockLink_t) - sizeof(void *) + ((size_t)(portBYTE_ALIGNMENT - 1))) & ~((size_t) portBYTE_ALIGNMENT_MASK);

static const size_t xBlockAllocatedBit = (8 * 1024 * 1024); //Max Bulk Limit

void *psram_user_Realloc(void *pv, size_t xWantedSize)
{
    uint8_t *puc = (uint8_t *) pv;
    BlockLink_t *pxLink;

    size_t xValueSize;

    void *pvReturn = NULL;

    if (pv != NULL) {
        /* The memory being freed will have an BlockLink_t structure immediately
           before it. */
        puc -= xHeapStructSize;

        /* This casting is to keep the compiler from issuing warnings. */
        pxLink = (void *) puc;


        if ((pxLink->xBlockSize & xBlockAllocatedBit) == xBlockAllocatedBit) {
            /* if (pxLink->pxNextFreeBlock == NULL) { */
            /* The block is being returned to the heap - it is no longer
               allocated. */
            xValueSize = (pxLink->xBlockSize & ~xBlockAllocatedBit) - xHeapStructSize;

            /* printf("0x%x - %d byte (%d, %d)", pv, xValueSize, pxLink->xBlockSize & ~xBlockAllocatedBit, xHeapUsedStructSize); */

            if (xValueSize >= xWantedSize) {
                pvReturn = pv;
            } else {
                pvReturn = malloc_psram(xWantedSize);
                ASSERT(pvReturn);
                if (pvReturn) {
                    memcpy(pvReturn, pv, xValueSize);
                    free_psram(pv);    //此处可以再优化，直接调用prvMergeBlockIntoFreeList
                }
            }
        } else {
            ASSERT(0);
        }
    }
    return pvReturn;
}

（3）calloc 接口实现

void *csi_calloc(uint32_t nblock, uint32_t size)
{
    printf("%s\n", __func__);
    void *pt = malloc_psram(nblock * size);
    memset(pt, 0x00, nblock * size);
    return pt;
}

(4) psram内存统计接口

/**
 * @brief: psram内存统计接口, 调用可获取信息:
 * 1. Free Block: 空闲块数量;
 * 2. MaxBlockSize: 最大空闲块大小;
 * 3. MinBlockSize: 最小空闲块大小;
 * 4. TotalFree: 空闲块总大小, EverMinFree: 系统运行过程中曾经最小值
 *
 */
/* ---------------------------------------------------------------------------- */
extern void psram_heap_stats(void);

类似内存打印，放在定时器里面打印看下
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(5) psram 内存释放接口

/* ---------------------------------------------------------------------------- */
/**
 * @brief: psram 内存释放接口
 *
 * @param pv: 释放的内存地址
 */
/* ---------------------------------------------------------------------------- */
extern void free_psram(void *pv);

(6)数组分配到psram

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