Installing ESB when using bootloader

RE: Installing ESB when using bootloader

Scott — Fri, 27 Nov 2015 19:19:58 GMT

Here is the interrupt handler in my bootloader. It shows how the interrupts are forwarded to the application. I have verified it.

NMI_Handler .. .. SWI0_IRQHandler

EXPORT NMI_Handler
    ..
    ..
EXPORT SWI0_IRQHandler

APPLICATION_VECTOR_TABLE EQU 0x0C00

MRS  R0, PSR
; Mask to get the interrupt number
ANDS R0, R0, #0x3F
EXTERN bootloader_active
LDR  R1, =bootloader_active
LDR  R2, [R1]
CMP  R2, #1
BEQ  bootload
LDR  R2, =APPLICATION_VECTOR_TABLE
; Irq address position = IRQ No * 4
LSLS R0, R0, #2
; Fetch the user vector offset
LDR	 R0, [R0, R2]
; Jump to user interrupt vector
BX	 R0

; Bootloader IRQ handlers - currently none used

bootload CMP R0, #27 BEQ RTC0

; RETURN code needed?
; RTC0 put here for sample. Copy as needed.

RTC0 EXTERN RTC0_IRQHandler_Bootloader[WEAK] LDR R0,=RTC0_IRQHandler_Bootloader B execute

execute BX R0

RE: Installing ESB when using bootloader

Scott — Wed, 25 Nov 2015 18:39:56 GMT

You are correct - table starts at 0xC00. Can you provide the link to the SDK example? I can't seem to locate it. Is there a way to locate the application vector table at an address other than 0x00000000? I don't have a reason for my method. I assume this has already been solved somewhere, but I can't locate the appropriate example.

I have verified that the interrupts are forwarded correctly in my routine. See my modified question above.

RE: Installing ESB when using bootloader

Vidar Berg — Wed, 25 Nov 2015 13:41:27 GMT

Hi, you need to forward execution to the reset handler of the application in order for the application to be properly initialized (load static variables, vector table, etc.) __main. Assume 0xC000 is a typo, should be 0xC00(?),but is there a particular reason for not linking the application vector table together with the application like in the SDK examples?

That being said, it does sound like the interrupts are not being forwarded correctly from the bootloader to the app. I would suggest to try a simple example that uses interrupts (e.g,\nRF51_SDK_10.0.0\examples\peripheral\led_softblink) and see whether or not the interrupts are being forwarded correctly from the bootloader.