Arm programming

•Three sources of LCD messages •Mix of fast and slow hardware •Mix of continuous, periodic, event driven, high priority and low priority requirements BÙI QU C B O 1 .Why use RTOS Concurrent processing

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Task A executes and starts to write the string “Hello world” to the LCD. Task A is pre-empted by Task B after outputting just the beginning of the string – “Hello w”. Task B writes “Abort, Retry, Fail?” to the LCD before entering the Blocked state. Task A continues from the point at which it was preempted and completes outputting the remaining characters – “orld”. The LCD will now be displaying the corrupted string “Hello wAbort, Retry, Fail?orld”. Read, Modify, Write Operations /* The C code being compiled. */ 155: PORTA |= 0x01; /* The assembly code produced. */ LDR R0,[PC,#0x0070] ;...

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FreeRTOS cho phép s d ng ng t. T t c các API có tên k t thúc b ng “FromISR” ho c “FROM_ISR” thì ñư c s d ng trong ISR. .Binary semaphore use for synchronization Binary semaphore use for synchronization BÙI QU C B O 2 .Binary semaphore use for synchronization Binary semaphore use for synchronization BÙI QU C B O 3 .Binary semaphore use for synchronization Binary semaphore use for synchronization BÙI QU C B O 4 .

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“It seems that perfection is attained not when there is nothing more to add, but when there is nothing more to remove.” (Antoine de Saint-Exupery) Write your ARM programs in an easy, clear native manner. Reduce your development time to a minimum. ARM SoC is considered as a simple microcontroller but with 32-bit, MIPS, Megabytes of RAM and Gigabytes of external storage memory!

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