How to make the Nrf51822 flash jump successful without Softdevice?

RE: How to make the Nrf51822 flash jump successful without Softdevice?

anna — Mon, 23 Oct 2017 11:06:40 GMT

Tank you very much.

RE: How to make the Nrf51822 flash jump successful without Softdevice?

anna — Mon, 23 Oct 2017 11:03:19 GMT

@Hung Bui ，can you do me a favor ,I just did as what you said ,but could not succeed .The irq_handler still not work .

RE: How to make the Nrf51822 flash jump successful without Softdevice?

Alexis Duque — Wed, 04 Nov 2015 11:27:58 GMT

Hi Hung Bui, Do you have the GCC vesion for this exemple ? Specifically the interrupt_handler.c file ? Thanks

RE: How to make the Nrf51822 flash jump successful without Softdevice?

bvrm — Wed, 13 May 2015 15:22:28 GMT

Ok here we go devzone.nordicsemi.com/.../

RE: How to make the Nrf51822 flash jump successful without Softdevice?

Hung Bui — Wed, 13 May 2015 14:25:17 GMT

@bvrm: please create a new question to discuss on the case.

RE: How to make the Nrf51822 flash jump successful without Softdevice?

bvrm — Wed, 13 May 2015 13:40:56 GMT

I did some investigations: R0 is loaded with 0x0000 0000 is above example. When removing [WEAK] everything works as expected. Leaving [WEAK] linker (Keil 5.14) is removing UART0_IRQHandler_Bootloader section.

Removing Unused input sections from the image.

    Removing main.o(.rev16_text), (4 bytes).
    Removing main.o(.revsh_text), (4 bytes).
    Removing main.o(i.init), (60 bytes).
    Removing uartreader.o(.rev16_text), (4 bytes).
    Removing uartreader.o(.revsh_text), (4 bytes).
    Removing uartreader.o(i.UART0_IRQHandler_Bootloader), (140 bytes).
    Removing uartreader.o(.bss), (50 bytes).
    Removing arm_startup_nrf51.o(HEAP), (1024 bytes).
    Removing system_nrf51.o(.rev16_text), (4 bytes).
    Removing system_nrf51.o(.revsh_text), (4 bytes).
    Removing system_nrf51.o(i.SystemCoreClockUpdate), (16 bytes).

11 unused section(s) (total 1314 bytes) removed from the image.

RE: How to make the Nrf51822 flash jump successful without Softdevice?

Susheel Nuguru — Wed, 13 May 2015 12:56:41 GMT

Thats probably because you do not have UART0_IRQHandler_Bootloader defined. Make sure that your bootloader UART0 interrupt handler is named with the same name as you are refering here which is void UART0_IRQHandler_Bootloader(void)

RE: How to make the Nrf51822 flash jump successful without Softdevice?

Hung Bui — Wed, 13 May 2015 12:40:36 GMT

@bvrm: Please create a new question, instead of posting a question as an answer. In your new question please add information on:

Would you have problem when testing with my bootloader example in the .zip file ?
What do you have in R0 when you LDR R0,=UART0_IRQHandler_Bootloader ?

RE: How to make the Nrf51822 flash jump successful without Softdevice?

bvrm — Wed, 13 May 2015 09:47:51 GMT

Hi Hung Bui

I'm using interrupt_handler.c for a bootloader without a softdevice. Interrupt handling in the main app seems to work fine. But interrupts in the bootloader leading to a reset.

For example my uart interrupt.

on an uart interrupt section bootloop is called
jumps to uart0
jumps to execute
execute jumps to 0x0000 0000

Why?

[uart.c]
void UART0_IRQHandler_Bootloader(void)
{
    // some code
}


[interrupt_handler.c]
bootload 
        CMP R0, #0x24;
        BEQ swi0
        CMP R0, #0x21;
        BEQ rtc1
        CMP R0, #0x16;
        BEQ gpiote
        CMP R0, #0x12;
        BEQ uart0
        //RETURN code needed
uart0
        EXTERN  UART0_IRQHandler_Bootloader[WEAK]     
        LDR    R0,=UART0_IRQHandler_Bootloader
        B execute ;            
execute            
        BX     R0  ;

RE: How to make the Nrf51822 flash jump successful without Softdevice?

Hung Bui — Wed, 01 Apr 2015 11:49:07 GMT

Hi lanxiang,

You would need to forward the interrupts (vector table) from Program A to program B when you switch to program B.

One solution is to use a flag to switch between 2 programs when calling the interrupt handler.

You can have a look at the attached bootloader without softdevice, where we check for bootloader_active flag to decide if we should call the interrupt handler in bootloader or in application. Please have a look at the interrupt_handler.c file.

The example's pretty old though.

nrf51822_v4.4 - Bootloader_Without_SD.zip