STM32G4, interrupt function delayed during flash write operation, interrupt vector table in ram, and interrupt function in ram. what am i doing wrong ?
I developed virtual eeprom function that is running fine. But when i write my interrupts are delayed. To avoid this delay, i decided to move all the code of the interrupt from flash to ram using linker script (i currently just toggle a pin in the interrupt):
/* Initialized data sections into "RAM" Ram type memory */
.data :
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
*(.RamFunc) /* .RamFunc sections */ <------------
*(.RamFunc*) /* .RamFunc* sections */ <------------
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >RAM AT> FLASH
Also i moved interrupt vector table from flash to ram at the beginning of the code so i declared :
#define VECTORTABLE_SIZE (118) /* size of the used vector tables, see startup file */
#define VECTORTABLE_ALIGNMENT (0x200U) /* see programming manual */
/* externals from startup file */
extern u32 g_pfnVectors[VECTORTABLE_SIZE]; /* vector table ROM */
/* new vector table in RAM, same size as vector table in ROM */
u32 vectorTable_RAM[VECTORTABLE_SIZE] __attribute__(( aligned (VECTORTABLE_ALIGNMENT) ));and then the code to copy the IVT called at beginning of main:
u32 i;
for (i = 0; i < VECTORTABLE_SIZE; i++) {
vectorTable_RAM[i] = g_pfnVectors[i]; /* copy vector table to RAM */
}
/* relocate vector table */
__disable_irq();
SCB->VTOR = (uint32_t)&vectorTable_RAM;
__DSB();
__enable_irq();when i debug i can see that bit 29 of VTOR is 1 so it seems to work fine. When i stop i see that my interrupt is at a ram address in disassembly.
everything is running, no error but i have still the delay like i did nothing
i am stuck :expressionless_face: , i guess i am missing something
at the moment i just have an interrupt on timer update to toggle a pin and my virtual eeprom function in the main infinite loop, this function code is still running from flash.
