rt-thread/bsp/synwit/libraries/SWM320_CSL/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 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 RefreshTime;        // 刷新时间，单位 ms，在这个时间内 SDRAM 必须完成一次整片刷新，通常为 64ms

    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，Activate to activate on same bank
                                // 若 SDRAM 颗粒除了 tRC，还有 tRFC 或 tRRC 参数，则按照二者中较大的计算 TimeTRC
    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__