TMS570LS1227: Branch assembly instruction for Jump to Application Address

Hi Vijay,

1. You can use the following C instruction to jump to Application

        ((void (*)(void))g_ulTransferAddress)();

2. or AM Assembly instruction:

    asm( "   BLX Rm");

Vijay Shinde said:

1) How and where is this Rm symbol defines?

Rm is any of the MCU general registers.

Vijay Shinde said:

The application code address starts at 0x80000, so how it has to be defined in configuration file and in the above asm BLX Rm instruction.

asm("  mov r12, #0x80000");

asm("  blx r12");

Vijay Shinde said:

 2)  ((void (*)(void))g_ulTransferAddress)(); : is this any library function?

No, this is from my bootloader example project. g_ulTransferAddress is the application start address.

Hi Vijay,

1) asm(" mov r12, 0x20000");

     asm(" blx r12");

should work.

This is example. 0x5960 is the address of sciInit().

2) 

Vijay Shinde said:

Can you please provide the definition for the respective routine :

  ((void (*)(void))0x20000)();  

In the above function call, (void (*) (void)) is the data type: a pointer to a function that takes no arguments and that returns a void.

The 0x20000 is the address to cast. After the type cast, the function pointer points to address 0x20000. Note that we put parentheses () around the data type and the 0x20000. This is unnecessary if we only want to cast 0x20000 to a function pointer. However, since we are going to invoke the function, these parentheses are required.

Casting a numeric constant to a pointer is not the same as calling a function through a pointer. To do that, we must specify an argument list. That is what the () at the end of the line does.

Note that all parentheses in this expression are required. Grouping and precedence are important.