Bootloader in STM32L0

[gerardo]

Posted on February 19, 2015 at 10:57

Hi all,

Is it necesary to implement a additional code in my application to jump to the bootloader?

#magic-eight-ball

[Tesla DeLorean]

Posted on February 19, 2015 at 12:06

Signs Point to Yes

[qwer.asdf]

Posted on February 19, 2015 at 12:54

No if you can play with the PINs: you should make sure Boot0(Pin) = 1 and Boot1(Pin) = 0, then power it up, the bootloader will start executing. See

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00167594.pdf

.

[Tesla DeLorean]

Posted on February 19, 2015 at 14:17

No if you can play with the PINs: you should make sure Boot0(Pin) = 1 and Boot1(Pin) = 0, then power it up, the bootloader will start executing. See

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00167594.pdf

.

That's not the simplest way for it to happen.

[Tesla DeLorean]

Posted on February 20, 2015 at 05:20

Bit of a blind port, but should work fine

Reboot_Loader PROC
EXPORT Reboot_Loader
LDR R0, =0x40021034 ; RCC_APB2ENR (+0x34)
LDR R1, =0x00000001 ; ENABLE SYSCFG CLOCK
STR R1, [R0, #0]
LDR R0, =0x40010000 ; SYSCFG_CFGR1 (+0x00)
LDR R1, =0x00000001 ; MAP ROM AT ZERO
STR R1, [R0, #0]
LDR R0, =0x1FF00000 ; ROM BASE (STM32L053)
LDR R1, [R0, #0] ; SP @ +0
MOV SP, R1
LDR R0, [R0, #4] ; PC @ +4
BX R0
ENDP ; [e-mail]

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[a.sombre.person]

I'm trying to do the same thing with L071 and my MCU jumps to the bootloader with no problem. But for some reason I can't make its i2c interface work. I can talk to the bootloader using i2c if I am entering it not from software. What am I missing?