The USB OTG module in Kinetis parts uses a Buffer Descriptor Table (BDT) in system memory to manage USB endpoint communications, the BDT is a a 512-byte buffer and there are 3 registers in USB module to contain the base address for it, and it must be 512-byte aligned otherwise there would be issue during transfer. In USB stack ver 4.1.1, some Kinetis old parts like K60N512, K20D72M have the demo project basked on CodeWarrior ARM compiler, and in khci_kinetis.c, bdt is defined as following: #define _BDT_RESERVED_SECTION_ #if(defined _BDT_RESERVED_SECTION_) #ifdef __CWCC__ #pragma define_section usb_bdt ".usb_bdt" RW __declspec(usb_bdt) uint_8_ptr bdt; but since the base address is defined as below: #define BDT_BASE ((uint_32*)(bdt)) so the bdt definition is not correct , and we have to change it as below: #define _BDT_RESERVED_SECTION_ #if(defined _BDT_RESERVED_SECTION_) #ifdef __CWCC__ #pragma define_section usb_bdt ".usb_bdt" RW __declspec(usb_bdt) uint_8 bdt[512];//uint_8_ptr bdt; and the definition for usb_dbt section can be found in MK20X256_flash.lcf. with above modification, we can make the demo of "msd_mfs_generic" work well as expected. Please kindly refer to the following result got from TWR-K20D72M. FAT demo Waiting for USB mass storage to be attached... Mass Storage Device Attached ****************************************************************************** * FATfs DEMO * * Configuration: LNF Enabled, Code page =1258 * ****************************************************************************** ****************************************************************************** * DRIVER OPERATION * ****************************************************************************** 1. Demo function: f_mount Initializing logical drive 0... Initialization complete ----------------------------------------------------------------------------- 2. Demo functions:f_getfree, f_opendir, f_readdir getting drive 0 attributes............... Logical drive 0 attributes: FAT type = FAT16 Bytes/Cluster = 2048 Number of FATs = 2 Root DIR entries = 512 Sectors/FAT = 250 Number of clusters = 63858 FAT start (lba) = 36 DIR start (lba,clustor) = 536 Data start (lba) = 568 ... 127716 KB total disk space. 127624 KB available. ----------------------------------------------------------------------------- ****************************************************************************** * DRECTORY OPERATION * ****************************************************************************** 1. Demo functions:f_opendir, f_readdir Directory listing... ----A 2014/04/16 17:25 32253 tek00000.png ----A 2014/04/16 17:34 31451 tek00001.png ----A 2014/07/04 14:57 20549 tek00002.png DR--- 2010/12/25 23:30 0 DIRECT~1 D---- 2010/01/01 00:00 0 DIRECT~2 3 File(s), 84253 bytes total 2 Dir(s) ----------------------------------------------------------------------------- 2. Demo functions:f_mkdir 2.0. Create <Directory_1> 2.1. Create <Directory_2> 2.2. Create <Sub1> as a sub directory of <Directory_1> 2.3. Directory list Directory listing... ----A 2014/04/16 17:25 32253 tek00000.png ----A 2014/04/16 17:34 31451 tek00001.png ----A 2014/07/04 14:57 20549 tek00002.png DR--- 2010/12/25 23:30 0 DIRECT~1 D---- 2010/01/01 00:00 0 DIRECT~2 3 File(s), 84253 bytes total 2 Dir(s) ----------------------------------------------------------------------------- 3. Demo functions:f_getcwd, f_chdir 3.0. Get the current directory CWD: 0:/ 3.1. Change current directory to <Directory_1> 3.2. Directory listing Directory listing... D---- 2010/01/01 00:00 0 . D---- 2010/01/01 00:00 0 .. D---- 2010/01/01 00:00 0 sub1 0 File(s), 0 bytes total 3 Dir(s) 3.3. Get the current directory CWD: 0:/Directory_1 ----------------------------------------------------------------------------- 4. Demo functions:f_stat(File status), f_chmod, f_utime 4.1. Get directory information of <Directory_1> DR--- 2010/12/25 23:30 0 Directory_1 4.2 Change the timestamp of Directory_1 to 12.25.2010: 23h 30' 20 4.3. Set Read Only Attribute to Directory_1 4.4. Get directory information (Directory_1) DR--- 2010/12/25 23:30 0 Directory_1 ----------------------------------------------------------------------------- 5. Demo functions:f_rename Rename <sub1> to <sub1_renamed> and move it to <Directory_2> Directory listing... D---- 2010/01/01 00:00 0 . D---- 2010/01/01 00:00 0 .. D---A 2010/01/01 00:00 0 SUB1_R~1 0 File(s), 0 bytes total 3 Dir(s) ----------------------------------------------------------------------------- 6. Demo functions:f_unlink Delete Directory_1/sub1_renamed Directory listing... D---- 2010/01/01 00:00 0 . D---- 2010/01/01 00:00 0 .. 0 File(s), 0 bytes total 2 Dir(s) ****************************************************************************** * FILE OPERATION * ****************************************************************************** 1. Demo functions:f_open,f_write, f_printf, f_putc, f_puts, fclose 1.0. Create new file <New_File_1> (f_open) File size = 0 1.1. Write data to <New_File_1>(f_write) 1.2. Flush cached data File size = 52 1.3. Write data to <New_File_1> (f_printf) 1.4. Flush cached data File size = 103 1.5. Write data to <New_File_1> (f_puts) 1.6. Flush cached data File size = 152 1.7. Write data to <New_File_1> uses f_putc function 1.8. Flush cached data File size = 199 1.9. Close file <New_File_1> ----------------------------------------------------------------------------- 2. Demo functions:f_open,f_read, f_seek, f_gets, f_close 2.0. Open <New_File_1> to read (f_open) 2.1. Get a string from file (f_gets) Line 1: Write data to file uses f_write function 2.2. Get the rest of file content (f_read) Line 2: Write data to file uses f_printf function Line 3: Write data to file uses f_puts function Line 4: Write data to file uses f_putc functionûöF¬ â•:7Rz}™ yzjw8¸×áÀ—»ÃйòÍ ä‹Hïk¨Wã½c' ²7këÞÑ%VrC×»Ô¼ÒSÈÑèR+NjD¡¾òû>ú3‰SËþo^ÎI Pë±ñ‰þ/Directory_1[1] 2.3. Close file (f_close) ----------------------------------------------------------------------------- 3. Demo functions:f_stat, f_utime, f_chmod 3.1. Get information of <New_File_1> file (f_stat) ----A 2010/01/01 00:00 199 New_File_1.dat 3.2 Change the timestamp of Directory_1 to 12.25.2010: 23h 30' 20 (f_utime) 3.3. Set Read Only Attribute to <New_File_1> (f_chmod) 3.4. Get directory information of <New_File_1> (f_stat) -R--A 2010/12/25 23:30 199 New_File_1.dat 3.5. Clear Read Only Attribute of <New_File_1> (f_chmod) 3.6. Get directory information of <New_File_1> ----A 2010/12/25 23:30 199 New_File_1.dat ----------------------------------------------------------------------------- 4. Demo functions:f_ulink Rename <New_File_1.dat> to <File_Renamed.txt> Directory listing... D---- 2010/01/01 00:00 0 . D---- 2010/01/01 00:00 0 .. ----A 2010/12/25 23:30 199 FILE_R~1.TXT 1 File(s), 199 bytes total 2 Dir(s) ----------------------------------------------------------------------------- 5. Demo functions:f_truncate Truncate file <File_Renamed.txt> 5.0. Open <File_Renamed.txt> to write 5.1. Seek file pointer Current file pointer: 0 File pointer after seeking: 102 5.2. Truncate file File size = 102 5.3. Close file ----------------------------------------------------------------------------- 6. Demo functions:f_forward 6.0. Open <File_Renamed.txt> to read 6.1. Forward file to terminal Line 1: Write data to file uses f_write function Line 2: Write data to file uses f_printf function 6.2. Close file ----------------------------------------------------------------------------- 7. Demo functions:f_ulink Delete <File_Renamed.txt> Directory listing... D---- 2010/01/01 00:00 0 . D---- 2010/01/01 00:00 0 .. 0 File(s), 0 bytes total 2 Dir(s) *------------------------------ DEMO COMPLETED ------------------------ * ******************************************************************************
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