Reset Scenario With Processor Expert
Figure 1 describes a typical initialization scenario with Processor
Expert after the cpu reset. The _EntryPoint() function is called as the first function after
the reset. This function is defined in the cpu module, usually Cpu.c,
and provides necessary system initialization like PLL, external bus, etc... The C startup module is called at the end of the _EntryPoint()
function. The C startup module provides necessary initialization of the
stack pointer, runtime libraries, etc... At the end of the C startup
module the main() function is called. There is a second level of Processor Expert initialization PE_low_level_init()
called at the beginning of the main() function. PE_low_level_init()
function provides initialization of all beans in project and it is
necessary for proper functionality of the Processor Expert project. The user can write his/her own code that will be invoked from the
PE_low_level_init() function after Processor Expert internal
initialization before the initialization of individual beans. Thus, the
user should expect that peripherals are not completely initialized yet.
This event can be enabled/disabled in the CPU bean
inspector's events page.
Figure 1 - Reset sequence
diagram
_EntryPoint function
Sometimes it is necessary to do some special user initialization
immediately after the cpu reset. Processor Expert provides a possibility
to insert user code into the _EntryPoint() function. There
is a User Initialization property in the build options tab of a CPU bean
inspector defined for this purpose. See chapter Bean
Inspector for details.C startup module
PE_low_level_init()
OnReset event