mmc_readblock(&sdc,fat1_addr+offset/512,mmc_buffer); //读取起始簇号所在的块 mmc_buffer[offset%512]=0xff;//文件结束标志ff ff mme_buffer[offset%512+1]=0xff; mmc_write_block(&sdc,fat1_addr+offset/512,mmc_buffer); //写FAT1 mmc_write_block(&sdc,fat2_addr+offset/512,mmc_buffer);...
4: Basic read (with data verification) 5: Multi-block write 6: Multi-block read 7: Power of two block writes 8: Power of two block reads 9: Weird sized block writes 10: Weird sized block reads 11: Badly aligned write 12: Badly aligned read 13: Badly aligned multi-block write 14:...
block单位是512字节 例: mmc dev 3 0 mmc read 0x10800000 600 10 命令分析:表示从mmc上1536×512个字节開始处(1536是600的十进制),读取16×512个字节(16是10的10进制)到内存0x10800000 处 显示结果: MMC read: dev #3, block # 1536, count 16 … 16 blocks read: OK 结果分析: 我们仅仅能从结果看...
=> mmc read 0x80800000 0x600 0x10 MMC read: dev # 1, block # 1536, count 16 ... 16 blocks read: OK 从EMMC 的第 1536(0x600)个块开始,读取 16(0x10)个块的数据到 DRAM 的0X80800000 地址处。 7、mmc write 命令 mmc write命令用于将数据从内存写入到 MMC 设备的指定扇区中。通过执行 mmc ...
block单位是512字节 例: mmc dev 3 0 mmc read 0x10800000 600 10 命令分析:表示从mmc上1536×512个字节开始处(1536是600的十进制),读取16×512个字节(16是10的10进制)到内存0x10800000 处 显示结果: MMC read: dev #3, block # 1536, count 16 ... 16 blocks read: OK ...
MMC read: dev # 1, block # 1536, count 16 ... 16 blocks read: OK 1. 2. 3. 4. 5. 6. 这里我们还看不出来读取是否正确,通过 md.b 命令查看 0x80800000 处的数据就行了,查看 16*512=8192(0x2000)个字节的数据,命令如下: md.b 80800000 2000 ...
增加multiple block read/write 特性,提升 Performance v3.3 版本也是一个重要的版本,该版本新增 RS-MMC(Reduced Size MMC)规格,制定24mm x 18mm x 1.4mm尺寸规格,将 MMC 卡的大小减少近一半。 RS-MMC 只是物理尺寸的定义,硬件接口没有变化,外观大概这个样子(图片来自网络): ...
8 读单块 1.发送CMD17，收到0x00表示成功 2.连续读直到读到开始字节0xFE 3.读512个字节 4.读两个CRC字节unsigned char *SD_Block_Read(unsigned long address){ unsigned int i=0 while(SD_Cmd_NoFault(0x11,address,0xff) != 0x00); while(SPI_Read_byte() != 0xfe); for(i=0;i<512...
atomic_read(abort):0;if(stop||!host->claimed||host->claimer==current)// 当host的占用标志claimed为0,或者占用者是当前进程的时候,说明可以占用了,退出break;spin_unlock_irqrestore(&host->lock,flags);schedule();// 否则,进行调度进入休眠spin_lock_irqsave(&host->lock,flags);}set_current_state(...
Mmc_read_block(&sdc,fat1_addr+offset/512,mmc-buffer); Mmc_buffer[offset%512]=0xff; Mmc_buffer[offset%512+1]=0xff; Mmc_write_block (&sdc,fat1_addr+offset/512,mmc_buffer); Mmc_write_block (&sdc,fat2_addr+offset/512,mmc_buffer); ...