CMSIS-Compiler 2.2.0

Changes since version 2.1.0

• Add components that enable stdio retarget to UART (#74)
• Update example project

AC6:

• correct _sys_read return value when rt_fs_read returns with error (#62)
• correct _mutex_initialize to check whether RTOS2 kernel is initialized

IAR:

• add support for multithreading (#57)
• add support for file redirection (#58)