CCS/TM4C123GH6PGE: Difference between MAP_SysCtlPeripheralEnable and SysCtl Peripheral Enable

Hi Satya,

APIs provided by rom.h, a set of MAP_Function() APIs are provided. If the function is available in ROM, MAP_Function() simply calls ROM_Function(); otherwise it calls Function().

Let's take GPIODirModeSet() as an example. The GPIODirModeSet() is an API function but there is also the same function ROM_GPIODirModeSet() that is stored in the device's internal ROM. The API executed out of the ROM is faster and more optimized. If you call MAP_GPIODirModeSet() then it will look for the rom_map.h to find out if the corresponding ROM_GPIODirModeSet() is valid and up to date. If yes, it will use the ROM library ROM_GPIODirModeSet() function. Sometimes, the ROM version of the API is not up to date due to bugs and in this case and hence deprecated, the rom_map.h will map the function to GPIODirModeSet() instead.

Thanks Charles!!!!!!!!!