運用法式操作NorFlash示例代碼分享(norflash接口應用辦法)。本站提示廣大學習愛好者：（運用法式操作NorFlash示例代碼分享(norflash接口應用辦法)）文章只能為提供參考，不一定能成為您想要的結果。以下是運用法式操作NorFlash示例代碼分享(norflash接口應用辦法)正文
int dealwithnor()
{
// glob_t mtdbuf;
struct mtd_info_user mtd;
struct erase_info_user erase;
int blocks = 0;
int i = 0; //用於掌握擦除的塊的個數
int k = 0;
int written = 0; //已寫入的字節數，只初始化一次
unsigned int size = StateOfImage.st_size; //應當是鏡像的現實年夜小，由於內存中年夜於鏡像的空間的內容弗成預知
unsigned int result = 0;
unsigned int DevNum = 0; //裝備的數目
unsigned int StartDev = 0; //從第startDev開端擦除
char DevName[20] = {0};
unsigned int AllSize = 0;
#define MAXPARTITIONS 40
struct DeviceInfo
{
int fd;
char dir[20];
uint32_t size; // Total size of the MTD
uint32_t erasesize;
}DevInfo[MAXPARTITIONS];//用來存儲裝備信息
bzero(DevInfo, sizeof(struct DeviceInfo));
/* 這是一種辦法，然則有一個缺陷，當mtd裝備年夜於10個是，經由過程glob搜刮出來的成果
會出成績，上面采取會采取第二種辦法 */
// if(searchmtd(&mtdbuf) != 0){
// DEBUG("Sorry! Can not find mtd device\n");
// return 1; //前往年夜於零的數，表現進級掉敗
// }
// else
// {
// int fd;
//
// DEBUG("find %d mtd devices \n",mtdbuf.gl_pathc);
// DevNum = mtdbuf.gl_pathc;
// for(i=0; i<DevNum; i++)
// {
// fd = safeOpen (mtdbuf.gl_pathv[i],O_SYNC | O_RDWR);
// if(fd < 0)
// {
// printf("failt to open\n");
// return 1;
// }
// bzero(&mtd, sizeof(struct mtd_info_user));
// if (ioctl(fd, MEMGETINFO,&mtd) < 0)
// {
// DEBUG("ioctl(): %m\n");
// DEBUG("This doesn't seem to be a valid MTD flash device!\n");
// return 1;
// }
//
// strcpy(DevInfo[i].dir, mtdbuf.gl_pathv[i]);
// DevInfo[i].fd = fd;
// DevInfo[i].size = mtd.size;
// DevInfo[i].erasesize = mtd.erasesize;
// }
// globfree(&mtdbuf);
// for(i=0; i<DevNum; i++)
// {
// printf("\n\tinfo of %s\n",DevInfo[i].dir);
// printf("%s.fd: %d\n",DevInfo[i].dir, DevInfo[i].fd);
// printf("%s.size: %d\n",DevInfo[i].dir,DevInfo[i].size);
// printf("%s.erasesize: %d\n",DevInfo[i].dir,DevInfo[i].erasesize);
// }
// }
/* 上面是第二種辦法，這類辦法戰勝了第一種辦法的缺點，不受mtd裝備數目的限制 */
for(i=0; i<MAXPARTITIONS; i++)
{
int fd;
sprintf(DevName, "%s%d", "/dev/mtd",i);
if((fd = open (DevName,O_SYNC | O_RDWR)) > 0)
{
bzero(&mtd, sizeof(struct mtd_info_user));
if (ioctl(fd, MEMGETINFO,&mtd) < 0)
{
DEBUG("ioctl(): %m\n");
DEBUG("This doesn't seem to be a valid MTD flash device!\n");
return 1;
}
strcpy(DevInfo[i].dir, DevName);
DevInfo[i].fd = fd;
DevInfo[i].size = mtd.size;
DevInfo[i].erasesize = mtd.erasesize;
}
else
{
DevNum = i;
break;
}
}
for(i=0; i<DevNum; i++)
{
printf("\n\tinfo of %s\n",DevInfo[i].dir);
printf("%s.fd: %d\n",DevInfo[i].dir, DevInfo[i].fd);
printf("%s.size: %d\n",DevInfo[i].dir,DevInfo[i].size);
printf("%s.erasesize: %d\n",DevInfo[i].dir,DevInfo[i].erasesize);
AllSize += DevInfo[i].size;
}
if(AllSize < StateOfImage.st_size)
{
DEBUG("ERROR!! all device size is less than ImageSize\n");
return 1;
}
for(i=StartDev; i<DevNum; i++)
{
/**
* 先輩行擦除操作
*/
int j = 0;
g_AllImgSize = DevInfo[i].size;
g_AllImgWrite = 0;
erase.start = 0;
blocks = DevInfo[i].size / mtd.erasesize; //盤算要擦除的塊的個數
erase.length = mtd.erasesize;
printf ("\nbegin to erase block %s\n", DevInfo[i].dir);
for (j= 1; j <= blocks; j++)
{
fprintf(stderr, "\rErasing blocks: %d/%d (%d%%)", j, blocks, (int)PERCENTAGE (j, blocks));
g_percentage = 100 * ((float)g_AllImgWrite / g_AllImgSize);
if (ioctl(DevInfo[i].fd, MEMERASE, &erase) < 0)
{
DEBUG("\n");
DEBUG("While erasing blocks 0x%.8x-0x%.8x on %s\n",\
(unsigned int) erase.start, (unsigned int) (erase.start + erase.length), DevInfo[i].dir);
/*return "Error while erasing blocks";*/
return 1;
}
g_AllImgWrite += erase.length;
erase.start += mtd.erasesize;
}
printf("\n\rErased blocks: %d/%d (100%%)\n", blocks, blocks);
/**
* 再停止寫操作
*/
printf ("\nbegin to write block %s\n\n", DevInfo[i].dir);
g_AllImgWrite = 0;
k = BUFSIZE;
while (size)
{
if (size < BUFSIZE)
{
k = size;
}
printf("\033[1A");
printf("\r%s usage: %dk/%dk (%d%%)\n",\
DevInfo[i].dir, KB (g_AllImgWrite + k), KB (DevInfo[i].size), (int)PERCENTAGE (g_AllImgWrite + k, DevInfo[i].size));
fprintf(stderr, "Writing data: %dk/%ldk (%d%%)", KB (written + k), KB (StateOfImage.st_size), (int)PERCENTAGE (written + k, StateOfImage.st_size));
result = write(DevInfo[i].fd, &upPack[written], k);
if (k != result)
{
DEBUG ("\n");
if (result < 0)
{
DEBUG("While writing data to 0x%.8x-0x%.8x on %s\n", written, written + k, DevInfo[i].dir);
return 1;
}
DEBUG("Short write count returned while writing to x%.8x-0x%.8x on %s: %d/%d bytes written to flash\n", \
written,written + k, DevInfo[i].dir, written + result, DevInfo[i].size);
return 1;
}
written += k;
size -= k;
g_AllImgWrite += k;
if(g_AllImgWrite >= DevInfo[i].size)
{
g_AllImgWrite = 0;
printf("\n");
break;
}
}
printf("Wrote %d / %ldk bytes\n", written, (unsigned long int)(StateOfImage.st_size));
}
munmap(upPack, UPGRADE_SHM_SIZE);
for(i=0; i<DevNum; i++)
{
close (DevInfo[i].fd);
printf("%s is closed!\n",DevInfo[i].dir);
}
return 0;
}
