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correct sequence of include and defines

Posted by wolfgang niggeschmidt on July 9, 2009

after downloading the actual freeRTOS 5.3 version and comparing the demo \freeRTOS53\FreeRTOS\Demo\ARM7_LPC2106_GCC there might be an error in the include-sequence. In the file FreeRTOSConfig.h are typedefs used, which are defined in portmacro.h, but protmacro.h uses a define 'configUSE_16_BIT_TICKS', which is set later in the freeRTOSConfig.h. How can this correctly pre-processed?

RE: correct sequence of include and defines

Posted by Richard on July 9, 2009
FreeRTOS.h should always be the first FreeRTOS related header file included. When this is done:

First projdefs.h is included. This just defined a few things like pdTRUE and pdFALSE, etc.

Next FreeRTOSConfig.h is included. This uses the as yet undefined typedef portTickType, but FreeRTOSConfig.h is just a header file so will replace macros with text that uses portTickType but does not yet have to compile. It will also define configUSE_16_BIT_TICKS.

Finally portable.h is included which itself included portmacro.h. portmacro.h defines portTickType depending on the already defined configUSE_16_BIT_TICKS. This happens before compilation starts so everything is now straight.

Does that answer your question?


RE: correct sequence of include and defines

Posted by wolfgang niggeschmidt on July 9, 2009
Yes. Thank you very much for your very fast answer.

Best regards

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