Application Overview

AN4515

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Executing an interrupt from RAM

The steps required to execute an interrupt handler from RAM0 are the following:

1.

Update the linker file (.icf) (see Figure 9).

a)

Define the address where the second vector table will be located: 0x2000 0000.

b)

Tell the linker to copy the section named .intvec_RAM0 at startup.

2.

Update the startup file (see Figure 10)

3.

Place the interrupt handlers to be executed in RAM0 in the new stm32F4xx_it_ram.c

as described in Section : Executing a source file from RAM.

4.

Remap the vector table to RAM0. To do this, modify the VTOR register in SystemInit

function as following:

SCB->VTOR = 0x2000 0000 | VECT_TAB_OFFSET

Figure 10. Update of EWARM startup file to handle an interrupt