rt-thread/bsp/synwit/swm341/libraries/SWM341_StdPeriph_Driver/SWM341_sdram.h

#ifndef __SWM341_SDRAM_H__
#define __SWM341_SDRAM_H__

typedef struct {
    uint8_t Size;               // SDRAM 容量，SDRAM_SIZE_2MB、SDRAM_SIZE_8MB、SDRAM_SIZE_16MB、SDRAM_SIZE_32MB
    uint8_t ClkDiv;             // SDRAM 时钟分频，SDRAM_CLKDIV_1、SDRAM_CLKDIV_2
    uint8_t CASLatency;         // 列地址到有效数据输出间隔，SDRAM_CASLATENCY_2、SDRAM_CASLATENCY_3

    uint8_t TimeTRP;            // Row precharge delay，Precharge命令到另一个命令间延时
    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 TimeTRFC;           // Refresh Cycle
} SDRAM_InitStructure;

                                //rowaddr         bankaddr        coladdr
#define SDRAM_SIZE_2MB      3   //HADDR[20:10]    HADDR[9]        HADDR[8:1]
#define SDRAM_SIZE_8MB      0   //HADDR[22:11]    HADDR[10:9]     HADDR[8:1]
#define SDRAM_SIZE_16MB     1   //HADDR[23:12]    HADDR[11:10]    HADDR[9:1]
#define SDRAM_SIZE_32MB     2   //HADDR[24:12]    HADDR[11:10]    HADDR[9:1]

#define SDRAM_CLKDIV_1      0
#define SDRAM_CLKDIV_2      1

#define SDRAM_CASLATENCY_2  0
#define SDRAM_CASLATENCY_3  1


#define SDRAM_TRP_1         0
#define SDRAM_TRP_2         1
#define SDRAM_TRP_3         2
#define SDRAM_TRP_4         3

#define SDRAM_TRCD_1        0
#define SDRAM_TRCD_2        1
#define SDRAM_TRCD_3        2
#define SDRAM_TRCD_4        3

#define SDRAM_TRFC_4        3
#define SDRAM_TRFC_5        4
#define SDRAM_TRFC_6        5
#define SDRAM_TRFC_7        6
#define SDRAM_TRFC_8        7
#define SDRAM_TRFC_9        8
#define SDRAM_TRFC_10       9
#define SDRAM_TRFC_11       10
#define SDRAM_TRFC_12       11
#define SDRAM_TRFC_13       12
#define SDRAM_TRFC_14       13
#define SDRAM_TRFC_15       14
#define SDRAM_TRFC_16       15


void SDRAM_Init(SDRAM_InitStructure * initStruct);

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

#endif //__SWM341_SDRAM_H__