WhyCan Forum(哇酷开发者社区)

//***********************************************************************************************************
//  Ver 1.0
//      2022.04.02  1、新建文件。
//***********************************************************************************************************
//#include    "stdio.h"

//参数块定义
typedef struct{
    unsigned int  flashaddr;  //0x800,芯片起始地址
    unsigned int  flashwidth; //0x804,1=8bit,2=16bit,4=32bit
    unsigned int  width;      //0x808，数据总线位宽
    unsigned int  offset;     //0x80c，
    unsigned int  addr;       //0x810，FLASH操作地址
    unsigned int  size;       //0x814，擦除、写入字节数
    unsigned int  reserved;   //0x818，
    unsigned int  status;     //0x81c,in: 1=program, 2=erase, 5=chip erase, out: 0=o.k., 0x100=fail
    unsigned char   data[4096]; //0x820，缓冲区起始地址
}FlashParameter_Str;
//关键地址，TRACE32的数据交互都在这个结构体里面
static FlashParameter_Str FlashParameter __attribute__((at(0x20000800)));


#define FLASH_PAGE_SIZE     512

enum{
    FLASH_PROGRAM       = 0x01,
    FLASH_ERASE         = 0x02,
    FLASH_CHIP_ERASE    = 0x05,
};

#define FMC_FLPROT          *(unsigned int *)(0x40020000UL + 0x20)
#define FMC_FLOPMD1         *(unsigned int *)(0x40020000UL + 0x04)
#define FMC_FLOPMD2         *(unsigned int *)(0x40020000UL + 0x08)
#define FMC_FLSTS           *(unsigned int *)(0x40020000UL + 0x00)
#define FMC_FLERMD          *(unsigned int *)(0x40020000UL + 0x0c)
#define FMC_FLSTS_OVF_Msk   0x01
#define SCB_VTOR           *(unsigned int *)(0xE000E000UL + 0x0D00UL + 0x08)

//关键行，把main函数放到RAM首地址，找到这个问题花了不少时间。
#pragma arm section code = ".ARM.__at_0x20000000"
int main(void)
{     
    unsigned int errCnt = 65535;
    unsigned int tMs;
    unsigned int i;
    unsigned char *ptr,*buf;
    
    while(1)
    {
        switch(FlashParameter.status)
        {
            case FLASH_PROGRAM:
                ptr = (unsigned char *)FlashParameter.addr;
                buf = &FlashParameter.data[0];
                
                if(FlashParameter.size > 0xffff)
                {
                    FlashParameter.size = 0xffff;
                }
                
                FMC_FLPROT = 0xF1;
                
                for(i=0; i<FLASH_PAGE_SIZE; i++) 
                {
                    FMC_FLOPMD1 = 0xAA;
                    FMC_FLOPMD2 = 0x55;  
                    *ptr++ = *buf++;    
                    // polling OVER Flag
                    while((FMC_FLSTS & FMC_FLSTS_OVF_Msk) == 0);
                    FMC_FLSTS |= FMC_FLSTS_OVF_Msk;
                }

                FMC_FLPROT = 0x00;
                FlashParameter.status = 0;
                return(0);
                break;
                    
            case FLASH_ERASE:
                FMC_FLERMD = 0x10;
                FMC_FLPROT = 0xF1;
                FMC_FLOPMD1 = 0x55;
                FMC_FLOPMD2 = 0xAA;  
                // Write data to start address of sector to trigger Erase Operation
                *(unsigned int *) FlashParameter.addr = 0xFFFFFFFF;
                
                // polling Erase Over Flag
                while((FMC_FLSTS & FMC_FLSTS_OVF_Msk) == 0);
                FMC_FLSTS |= FMC_FLSTS_OVF_Msk;
                FMC_FLERMD = 0x00;
                FMC_FLPROT = 0x00;
                FlashParameter.status = 0;
                return(0);
                break; 
                    
            case FLASH_CHIP_ERASE:
                FMC_FLERMD = 0x08;
                FMC_FLPROT = 0xF1;
                FMC_FLOPMD1 = 0x55;
                FMC_FLOPMD2 = 0xAA;  
                *(unsigned char *) FlashParameter.addr = 0xff;    
                // polling OVER Flag
                while((FMC_FLSTS & FMC_FLSTS_OVF_Msk) == 0);
                FMC_FLSTS |= FMC_FLSTS_OVF_Msk;
                FMC_FLPROT = 0x00;
                FlashParameter.status = 0;
                return(0);
                break; 
              
            default:
                tMs = 65535;
                while(tMs--);
                break;
        }
        if(errCnt > 0) errCnt--;
        else           return(1);
    }
}
#pragma arm section