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Hi all , I’ve got a problem with Flash Magic Ethernet BootLoader . The original sample for LPC1768 works fine but with a little change I made in the source code of the bootloader program . Here’s the line I added : SCB->VTOR = 0x00002000; in the code below:
void execute_user_code(void) { void (*user_code_entry)(void); SCB->VTOR = 0x00002000; user_code_entry = (void (*)(void))(USER_START_SECTOR_ADDRESS | 0x00000001); user_code_entry(); }
I can load some of my own programs into the microcontroller through ethernet (Via Flash Magic) , But when I load Some others , they don’t work at all . Thanks in advanced
Bootloader Settings :
IROM1 = 0 , SIZE = 0x80000 IROM2 Not Used
IRAM1 Not Used IRAM2 = 0x20082000 , Size = 0x1000
/////////////
Program Settings :
IROM1 = 0x2000 , SIZE = 0x80000 IROM2 Not Used
IRAM1 =0x10000000,size=0x8000 IRAM2 = 0x2007C000 , Size = 0x6000 It seems the problem lies on IRAM1 & IRAM2 Settings or lies on the different initialization settings between the bootloader program and my own programs which are loaded into the microcontroller or lies on SCB->VTOR. I don’t exactly know how to set IRAM1 & IRAM2 in different programs . I just use different places in RAM and don’t know if some places are allocated to something or not or am I free to choose wherever interested or not ?
Isn’t the programs loaded supposed not to dependent on the bootloader program initialization ? For example PLL ,TIMER, UART,… settings are set for some programs and they work perfectly when not using a bootloader . Now the bootloader has some settings for PLL and timer and uart . For uart the first initialization is executed(BootLoader) and now the second is executed(The program loaded) with some changes . If I don’t have the exact same settings as bootloader settings on my program , the uart doesn’t work on the program !
The strange point is why there wasn’t the line I added to the bootloader program (SCB->VTOR = 0x00002000;) ?
any help ?
Thanks in advanced
Note that code has to be written with care to be able to ignore the existence of a boot loader.
A PLL normally has to be deactivated, before it can be reconfigured to a different speed. So if the boot loader sets up the PLL, then the application must notice that and deactivate it before it sets a different configuration.
AN application that don't start from a boot loader don't need to care - it already knows that the PLL is deactivated.
Same thing with lots of other things. Interrupt handlers needs to be configured in the correct order - if the boot loader have already installed an ISR to handle UART0, then incorrect sequences in the application can manage to trig interrupts into the bootloader before the application code have had time to replace the original interrupt handler vector to point at the application ISR instead of the boot loader ISR.
It is hard to say much based on what you posted, but what happens if an interrupt is handled just before you jump to application? Did you disable interrupt, or at least, the source that can generate an interrupt?
Thanks ,
I found out when jumping to the program (0x00002000), the reset handler of the program doesn’t resume . Apparently 0x00002000 is the place of Main and isn’t the place of LPC17XX_Startup.S of the program . So I added the SystemInit() function which was originally called from the LPC17XX_Startup of the program , to the first of main . Now some of my programs which didn’t work , work perfectly . But still some others don’t work perfectly .
Even though using SystemInit() at the first of main would fix some problems but some other settings in LPC17XX_Startup aren’t set yet . So I think jumping to the reset handler of the program instead of jumping to the main of the program(0x0002000) would fix everything.
How could I jump from the bootloader to the reset handler of the program ?
What does the map file tell you?
Don't you have an vector table at start of the application binary?
That table should contain a pointer to the reset handler.
I got fed up ……!!!!!! At the end of SystemInit from CMSIS , the SCB->VTOR is configured ,
So the steps are : 1- Before jumping to the user application , I set the SCB->VTOR to 0x00002000 2- At the start of user application(At the start of main) I call SystemInit but with SCB->VTOR set to 0x00002000 (Commented previous settings) Bootloader Settings : IROM1 = 0 , SIZE = 0x2000 IROM2 Not Used IRAM1 0x10007000 , Size = 0x1000 IRAM2 Not Used Program Settings : IROM1 = 0x2000 , SIZE = 0x2000 IROM2 Not Used IRAM1 = 0x10000000 , Size = 0x7000 IRAM2 = 0x2007C000 , Size = 0x8000
Now 99% of the programs are working correctly but still some problems persist In application program when I 1-change Heap Size from 0 to 0x400 , the program doesn’t work 2-check the PLL1 tick at System_LPC17xx , the program doesn’t work 3-comment 1 unimportant line of the function called Calc_Checksum , the program doesn’t work (for test purposes I had added this line to increase or decrease size of the function This is the line : “for (Cnt=0; Cnt<100; Cnt++);”)
I’m nearly sure the problem lies on IRAM1 & IRAM2 settings I tested a USB Bootloader and it’s working perfectly and the strange point is unlike the Ethernet Bootloader , both bootloader and the application have got the same IRAM1 & IRAM2 settings (both IRAM1’s settings is “0x10000000 , 0x8000” and both IRAM2’s setting is “unchecked” )
What could be the problem where 80k code is working and with commenting just 1 line , it’s not working ?
Sorry , above in program settings : IROM1 = 0x2000 , SIZE = 0x7E000