记上篇测试了flash读写，链接：https://bbs.21ic.com/icview-3205114-1-1.html 下面趁热打铁，把flash做成U盘测试下。
找到AT-START-F425开发板关于msc做U盘的例程改动一下。增加flash读写。U盘例子看了一下，很容易就加上了flash读写。
下面在U盘例子上增加一个盘。原例子是把mcu内部flash做的u盘。
首先修改如图
msc_bot_scsi.h文件
#define MSC_SUPPORT_MAX_LUN 2
然后主要是msc_diskio.c内修改：
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] disk read
- * @param lun: logical units number
- * @param addr: logical address
- * @param read_buf: pointer to read buffer
- * @param len: read length
- * @retval status of usb_sts_type
- */
- usb_sts_type msc_disk_read(uint8_t lun, uint32_t addr, uint8_t *read_buf, uint32_t len)
- {
- uint32_t i = 0;
- uint32_t flash_addr = addr + USB_FLASH_ADDR_OFFSET;
- <font color="#ff0000"> printf("MSC_R%d>>%X:%X\r\n",lun,addr,len);//打印输出</font>
- switch(lun)
- {
- case INTERNAL_FLASH_LUN:
- for(i = 0; i < len; i ++)
- {
- read_buf[i] = *((uint8_t *)flash_addr);
- flash_addr += 1;
- }
- break;
- case SPI_FLASH_LUN:
- <font color="#ff0000"> spiflash_read(read_buf,addr,len);</font>
- break;
- case SD_LUN:
- break;
- default:
- break;
- }
- return USB_OK;
- }
- /**
- * @brief disk write
- * @param lun: logical units number
- * @param addr: logical address
- * @param buf: pointer to write buffer
- * @param len: write length
- * @retval status of usb_sts_type
- */
- usb_sts_type msc_disk_write(uint8_t lun, uint32_t addr, uint8_t *buf, uint32_t len)
- {
- uint32_t flash_addr = addr + USB_FLASH_ADDR_OFFSET;
- uint32_t i = 0, tolen = len;
- uint32_t erase_addr = flash_addr;
- <font color="#ff0000"> printf("MSC_W%d>>%X:%X\r\n",lun,addr,len);</font>
- switch(lun)
- {
- case INTERNAL_FLASH_LUN:
- flash_unlock();
- while(tolen >= sector_size)
- {
- flash_sector_erase(erase_addr);
- tolen -= sector_size;
- erase_addr += sector_size;
- }
- for(i = 0; i < len; i ++)
- {
- flash_byte_program(flash_addr+i, buf[i]);
- }
- flash_lock();
- break;
- <font color="#ff0000"> case SPI_FLASH_LUN:
- spiflash_write(buf,addr,len);</font>
- break;
- case SD_LUN:
- break;
- default:
- break;;
- }
- return USB_OK;
- }
- /**
- * @brief disk capacity
- * @param lun: logical units number
- * @param blk_nbr: pointer to number of block
- * @param blk_size: pointer to block size
- * @retval status of usb_sts_type
- */
- usb_sts_type msc_disk_capacity(uint8_t lun, uint32_t *blk_nbr, uint32_t *blk_size)
- {
- uint32_t devid = (*((uint32_t *)DEBUG_BASE) & 0x00007000) >> 12;
- msc_flash_size = (*((uint32_t *)0x1FFFF7E0) << 10) - (USB_FLASH_ADDR_OFFSET - FLASH_BASE);
- switch(devid)
- {
- case 2:
- sector_size = SECTOR_SIZE_1K;
- break;
- case 3:
- sector_size = SECTOR_SIZE_2K;
- break;
- case 4:
- sector_size = SECTOR_SIZE_4K;
- break;
- default:
- sector_size = SECTOR_SIZE_2K;
- break;
- }
- switch(lun)
- {
- case INTERNAL_FLASH_LUN:
- *blk_nbr = msc_flash_size / sector_size;
- *blk_size = sector_size;
- break;
- <font color="#ff0000"> case SPI_FLASH_LUN://对应W25Q128
- *blk_nbr = 1024*1024*16 / 4096;
- *blk_size = 4096; </font>
- break;
- case SD_LUN:
- break;
- default:
- break;
- }
- return USB_OK;
- }
下面看看效果。枚举了2个U盘，一个内部flash的，一个W25Q128 flash的。枚举后要初始格式化一下。
下面是拷贝文件进去测试。
可以看到读写时串口信息输出。
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