rt-thread/bsp/swm320/libraries/SWM320_StdPeriph_Driver/SWM320_sdram.h

#ifndef __SWM320_SDRAM_H__
#define __SWM320_SDRAM_H__

typedef struct
{
    uint8_t CellSize;   // SDRAM颗粒的容量，SDRAM_CELLSIZE_16Mb、SDRAM_CELLSIZE_64Mb、SDRAM_CELLSIZE_128Mb、SDRAM_CELLSIZE_256Mb
    uint8_t CellBank;   // SDRAM颗粒有几个bank，SDRAM_CELLBANK_2、SDRAM_CELLBANK_4
    uint8_t CellWidth;  // SDRAM颗粒的位宽，SDRAM_CELLWIDTH_16、SDRAM_CELLWIDTH_32
    uint8_t CASLatency; // 列地址到有效数据输出间隔，SDRAM_CASLATENCY_2、SDRAM_CASLATENCY_3

    uint8_t TimeTMRD; // MRS to New Command
    uint8_t TimeTRRD; // Activate to activate on different banks
    uint8_t TimeTRAS; // Self refresh time，最小Self-refresh周期
    uint8_t TimeTRC;  // Row cycle delay，Refresh命令到Activate命令间延时，也是两个连续Refresh命令间延时
    uint8_t TimeTRCD; // Row to column delay，行地址到列地址间延时，也即Activate命令到读写命令间延时
    uint8_t TimeTRP;  // Row precharge delay，Precharge命令到另一个命令间延时
} SDRAM_InitStructure;

#define SDRAM_CELLSIZE_16Mb 3
#define SDRAM_CELLSIZE_64Mb 0
#define SDRAM_CELLSIZE_128Mb 1
#define SDRAM_CELLSIZE_256Mb 2

#define SDRAM_CELLBANK_2 0
#define SDRAM_CELLBANK_4 1

#define SDRAM_CELLWIDTH_16 0
#define SDRAM_CELLWIDTH_32 1

#define SDRAM_CASLATENCY_2 2
#define SDRAM_CASLATENCY_3 3

#define SDRAM_TMRD_3 3
#define SDRAM_TMRD_4 4
#define SDRAM_TMRD_5 5
#define SDRAM_TMRD_6 6
#define SDRAM_TMRD_7 7

#define SDRAM_TRRD_2 2
#define SDRAM_TRRD_3 3

#define SDRAM_TRAS_2 2
#define SDRAM_TRAS_3 3
#define SDRAM_TRAS_4 4
#define SDRAM_TRAS_5 5
#define SDRAM_TRAS_6 6
#define SDRAM_TRAS_7 7

#define SDRAM_TRC_2 2
#define SDRAM_TRC_3 3
#define SDRAM_TRC_4 4
#define SDRAM_TRC_5 5
#define SDRAM_TRC_6 6
#define SDRAM_TRC_7 7
#define SDRAM_TRC_8 8
#define SDRAM_TRC_9 9
#define SDRAM_TRC_10 10
#define SDRAM_TRC_11 11
#define SDRAM_TRC_12 12
#define SDRAM_TRC_13 13
#define SDRAM_TRC_14 14
#define SDRAM_TRC_15 15

#define SDRAM_TRCD_3 3
#define SDRAM_TRCD_4 4
#define SDRAM_TRCD_5 5
#define SDRAM_TRCD_6 6
#define SDRAM_TRCD_7 7

#define SDRAM_TRP_3 3
#define SDRAM_TRP_4 4
#define SDRAM_TRP_5 5
#define SDRAM_TRP_6 6
#define SDRAM_TRP_7 7

void SDRAM_Init(SDRAM_InitStructure *initStruct);

void SDRAM_Enable(void);
void SDRAM_Disable(void);

#endif //__SWM320_SDRAM_H__