What's New in RL-ARM Version 3.22a

RL-ARM Version 3.22a

Release Date: 30 June 2008

• [RTX Kernel]
  Corrected a problem in the Cortex-M library which was introduced in version 3.22 (re-entrance of isr_xxx functions).

RL-ARM Version 3.22

Release Date: 23 June 2008

• [Flash File System]
  Added Parallel Flash Memory driver for STmicroelectronics SST39FV320 device. An Em_File example for MCB2400 Keil evaluation board can be found in ..\ARM\Boards\Keil\MCB2400\RL\FlashFS folder.
• [Flash File System]
  Optimized the formating of SD/MMC memory cards. Function fat_format() has been optimized for maximum Memory Card performance. This format chooses optimal Cluster size and Cluster alignment for the Memory Card being formatted.
• [Flash File System]
  Updated: drivers MCI_LPC23xx.c and MCI_LPC24xx.c to support faster data read and data write with Multiple Block read and Multiple Block write commands.
• [Flash File System]
  Corrected: several problems with FAT file system folder handling.
• [Flash File System]
  Corrected a problem of in the FAT file system. After 512 times of creating and deleting a file, the root directory for FAT12/FAT16 was exhausted and it was not possible to create a new file in the root directory. This has been corrected by reusing deleted files marked with 0xE5 as free directory entries.
• [Flash File System]
  Corrected: potential SPI driver problem that might corrupt the FAT file system on SD/MMC Card. Automatic Slave Select SPI mode might deassert SS signal, if data transfer from CPU is paused for longer time. Instead of automatic SS a function spi_ss() is used which controls the SS signal.
• [RTX Kernel]
  Corrected: re-entrance problem of isr_xxx functions in Cortex-M library when using nested interrupts.Corrected: wrong task priority handling of the mutex owner task. When the priority inversion has been applied to a task which was the owner of the mutex, the original task's priority might not have been restored correctly.
• [RTX Kernel]
  Corrected: a mailbox problem in Cortex-M library. A message sent to a mailbox from an interrupt handler was lost in some rare timing situations. Corrected: wrong task priority handling of the mutex owner task. When the priority inversion has been applied to a task which was the owner of the mutex, the original task's priority might not have been restored correctly.
• [RTX Kernel]
  Corrected: a timing problem in ARM library. When isr_xxx() functions were called from more than one interrupt handler with a very high repetition rate, system delays might expire sooner than expected. This has happened because the RTX kernel has detected a false tick timer overflow and decremented timeouts also within an interval time.Corrected: wrong task priority handling of the mutex owner task. When the priority inversion has been applied to a task which was the owner of the mutex, the original task's priority might not have been restored correctly.
• [RTX Kernel]
  Corrected: wrong task priority handling of the mutex owner task. When the priority inversion has been applied to a task which was the owner of the mutex, the original task's priority might not have been restored correctly.Corrected the range checking in Cortex-M library for __svc functions. The __svc function with the highest svc number would never execute because of wrong svc range checking.
• [RTX Kernel]
  Corrected the range checking in Cortex-M library for __svc functions. The __svc function with the highest svc number would never execute because of wrong svc range checking.
• [TCPnet]
  Corrected a problem of hanging the application in sys_error() function caused by IP Packet Flooding Attacks and overload. A memory block for the received packet is allocated if there is at least 25% of available memory free after the allocation. Othervise a packet is discarded.
• [TCPnet]
  Corrected a problem in the debug library. Debug messages from alloc_mem() function are not printed anymore when this function is called from an IRQ handler.