Posted on April 05, 2013 at 23:33I have base my IAP on AN2557 application.
I change the offset for my APP to 0x08010000 because need same extra sectors for fix varibles.
I change the icf file according :
define symbol __ICFEDIT_intvec_start__ = 0x08010000;// start main APP on sector 4
define symbol __ICFEDIT_region_ROM_start__ = 0x08010000; // start main APP on sector 4
define symbol __ICFEDIT_region_ROM_end__ = 0x080FFFFF;
and in the main put this:
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x10000);
In the Boot App I set this code for jumping (copy from AN2557)
/* Test if user code is programmed starting from address ''ApplicationAddress'' */
if (((*(__IO uint32_t*)ApplicationAddress) & 0x2FFE0000 ) == 0x20000000)
{
SysTick_IRQControl(DISABLE); // Stop SysTick IRQ befor jump to the new application
/* Jump to user application */
JumpAddress = *(__IO uint32_t*) (ApplicationAddress + 4);
Jump_To_Application = (pFunction) JumpAddress;
/* Initialize user application's Stack Pointer */
__set_MSP(*(__IO uint32_t*) ApplicationAddress);
Jump_To_Application();
}
But when I made a bin code for the APP I get this hex on the first lines:
01 02 00 00 which not lead to get 0x2000---- on
if (((*(__IO uint32_t*)ApplicationAddress) & 0x2FFE0000 ) == 0x20000000)
When I look on the AN2557 APP code (SYSTICK) I found it start with 28 04 00 20 which I think get the 0x2000---- (Little indian format).
1. Am I right?
2. What is the porpuse of
this if:
if (((*(__IO uint32_t*)ApplicationAddress) & 0x2FFE0000 ) == 0x20000000)
3. What could be the reason I don't get the right address?
Regards
Bar.
#iap-jump-issue
