Problem with appliaction SPI ISR vector table using bootloader, Kinetis K20

[cavebiker]

Using MQX 4.0 CW 10.5 with a Kinetis K20XD256VMD10

I completed a bunch of smart cards using the Kinetis K20 and I'm ready to deploy a bootloader. A master CPU communicates to these smart cards via SPI. I hard-coded the SPI ISR into the vector table in vectors.c to eliminate the RTOS for this ISR. Everything works great without the bootloader installed.

For the Bootloader: what I did-->

#1 -I modified the USB MSD bootloader (AN4379) to bootload from SPI as well as from USB. Way cool.

#2 -In my application user_config.h file I added the line --> #define MQX_ROM_VECTORS         0

#3 -In my application linker file (intflash.lcf) I modified MEMORY per the AN4379 instructions -->

MEMORY

{

   vectorrom   (RX): ORIGIN = 0x0000C000, LENGTH = 0x00000400

   cfmprotrom (RX): ORIGIN = 0x0000C400, LENGTH = 0x00000020

   rom             (RX): ORIGIN = 0x0000C420, LENGTH = 0x00033BE0  # Code + Const data  

   ram             (RW): ORIGIN = 0x1FFF8400, LENGTH = 0x0000FC00  # SRAM - RW data

   # kernel space starts after RAM variables (Location of MQX Kernel data + MQX heap)

   end_of_kd   (RW): ORIGIN = 0x20007FF0, LENGTH = 0x00000000

   # Boot stack reused by MQX Kernel data

   bstack      (RW): ORIGIN = 0x20007A00, LENGTH = 0x00000200  # Boot stack

   end_bstack  (RW): ORIGIN = 0x20007C00, LENGTH = 0x00000000

}

#4 -In my application main_task() I added the code to copy my hard-coded SPI ISR to the SRAM vector table

#ifdef BOOTLOADER_ENABLE
	// Copy Application Stored Interrupt Vector table for SPI2 to SRAM

pdst=(uint_32*)0x1FFF80B0;     // SPI2 interrupt vector in SRAM.  

psrc=(uint_32*)0x0000C0B0;     // SPI2 interrupt vector in Flash.

for (i=0;i<0x1;i++,pdst++,psrc++) 

{

    *pdst=*psrc;

}

//	SCB_VTOR = (uint_32)0x1FFF8000;

#endif

#5 -When I look at the SRAM vector table memory my SPI ISR vector is there and it matched what I see in the .MAP file, as do all the other vectors match the .MAP file.

#6 -After I load my application using the bootloader with the line in the application //SCB_VTOR = (uint_32)0x1FFF8000;  commented out I can see my application main task running(my LED is blinking). I can't talk to my card using SPI now.

#7 -When I un-comment the line SCB_VTOR = (uint_32)0x1FFF8000; in the application I do not see my application run after a reset, i.e. no blinking LED , and the bootloader SPI ISR is still firing when I try to talk SPI to it.

#8 -A hint for you MQX gurus that are trying to save my day, I am positive this all worked (#6) almost 3 years ago when I first made this bootloader, but then I was running MQX 3.8. 

Thank you in advance to anyone who read this and is trying to help.

Cheers,

Tom

[cavebiker · Accepted solution]

Ah Haa, I got it!

In the linker file intflash.lcf I saw the __VECTOR_TABLE_RAM_START was at 0x1FFF8000, NOT 0x1FFF8400 like I had.

In intflash.lcf

Was:           ram             (RW): ORIGIN = 0x1FFF8400, LENGTH = 0x0000FC00  # SRAM - RW data

Changed to:ram             (RW): ORIGIN = 0x1FFF8000, LENGTH = 0x00010000  # SRAM - RW data​

and now everything works beautiful.

Cheers!

TJ

[soledad]

Hi Tom,

thanks for sharing your solution!!!

Regards

Soledad