54 FX3 Programmers Manual, Doc. # 001-64707 Rev. *C
FX3 Firmware
Figure 5-1. Initialization Sequence
1. The execution starts from the firmware image entry point. This is defined at the compile time for a
given FX3 firmware image. This function initializes the MMU, VIC, and stacks.
2. The second step in the initialization sequence is the Tool Chain init. This is defined by the tool
chain used to compile the FX3 firmware. Because the stack setup is complete, this function is
only expected to initialize any application data.
3. The main() function, which is the C programming language entry for the firmware, is invoked
next. The FX3 device is initialized in this function.
4. The RTOS kernel is invoked next from the main(). This is a non-returning call and sets up the
Threadx kernel.
5. At the end of the RTOS initialization, all the driver threads are created.
6. In the final step, FX3 user application entry is invoked. This function is provided to create all user
threads.
Firmware Entry Point
Tool Chain
Initialization
Firmware Main
RTOS Initialization
FX3 Application
Thread
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