TMS320F2800137: Custom Bootloader

Tanay Tripathi

Prodigy 70 points

Part Number: TMS320F2800137

Hello everyone,

I am working on a custom bootloader for the Texas Instruments TMS320F2800137 microcontroller.

Currently, I have created two separate application projects:

APP1 located at address 0x082000
APP2 located at address 0x090000

My goal is to implement a bootloader located at 0x080000 that can jump to either of these applications (APP1 or APP2) and execute them.

So far:

I am able to successfully flash the applications at their respective addresses.
When I run the code directly from Code Composer Studio, the applications execute correctly.
After reset, the MCU starts execution from 0x080000, which is where the bootloader should reside.

What I need help with is:

Writing the bootloader code that can jump to either APP1 or APP2.
Ensuring the stack pointer and interrupt vectors are correctly set before jumping to the selected application.

For reference, I am also attaching the custom linker command (.cmd) file for APP1 that defines its memory location.

If anyone has implemented something similar on this device or other C2000 MCUs, guidance or example code would be greatly appreciated.

Thank you.

MEMORY

{

/* ---------------- FLASH LAYOUT ---------------- */

BOOT_RSVD : origin = 0x080000, length = 0x002000 /* Sector 0 - 8KB Bootloader */

APP_SLOT_A : origin = 0x082000, length = 0x00E000 /* Sector 1-7 = 56KB */

/* Bank1 (future Slot B) */

APP_SLOT_B : origin = 0x090000, length = 0x00E000 /* 56KB */

CALIBRATION : origin = 0x09E000, length = 0x002000 /* Last 8KB sector */

/* ---------------- RAM ---------------- */

RAMM0 : origin = 0x00000128, length = 0x000002D8

RAMM1 : origin = 0x00000400, length = 0x000003F8

RAMLS0 : origin = 0x00008000, length = 0x00002000

RAMLS1 : origin = 0x0000A000, length = 0x00001FF8

RESET : origin = 0x003FFFC0, length = 0x00000002

}

SECTIONS

{

codestart : > APP_SLOT_A

.text : > APP_SLOT_A, ALIGN(8)

.cinit : > APP_SLOT_A, ALIGN(8)

.switch : > APP_SLOT_A, ALIGN(8)

.const : > APP_SLOT_A, ALIGN(8)

.pinit : > APP_SLOT_A, ALIGN(8)

.init_array : > APP_SLOT_A, ALIGN(8)

.reset : > RESET, TYPE = DSECT

.stack : > RAMM1

.bss : > RAMLS0

.bss:output : > RAMLS0

.data : > RAMLS0

.sysmem : > RAMLS0

.cio : > RAMLS0

/* RAM functions must NOT load from boot sector */

.TI.ramfunc :

LOAD = APP_SLOT_A,

RUN = RAMLS0,

LOAD_START(RamfuncsLoadStart),

LOAD_SIZE(RamfuncsLoadSize),

LOAD_END(RamfuncsLoadEnd),

RUN_START(RamfuncsRunStart),

RUN_SIZE(RamfuncsRunSize),

RUN_END(RamfuncsRunEnd),

ALIGN(8)

IQmath : > APP_SLOT_A, ALIGN(8)

IQmathTables : > APP_SLOT_A, ALIGN(8)

}

3 months ago

0 Matt Kukucka 3 months ago

TI__Mastermind 19800 points

Hello,

I'd refer to the LFU without reset implementation: https://www.ti.com/lit/an/spruiu9/spruiu9.pdf

There is example code for F28003x/F28P55x devices demonstrating how to branch between application versions (we typically use LCR to app's codestart), which should be the same for F280013x. I will also note that stack pointer is correctly set by the codestartbranch and that interrupts will have to be re-initialized by the next application.

Best,

Matt

0 Tanay Tripathi 3 months ago in reply to Matt Kukucka

Prodigy 70 points

Do we have something easy one such as pointer function something like "

typedef void (*appEntry)(void);

void JumpToApp(uint32_t addr)

{

appEntry entry = (appEntry)addr;

DINT;

IER = 0;

IFR = 0;

entry();

}

+1 Matt Kukucka 3 months ago in reply to Tanay Tripathi

TI__Mastermind 19800 points

Hello,

A function pointer works well too, as long as the entry address points to the codestart of the application.

Best,
Matt

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TMS320F2800137: Custom Bootloader