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GrumpyOldPizza / arduino-STM32L4

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Some questions #11

Closed edogaldo closed 7 years ago

edogaldo commented 7 years ago

Which is the reference library you rely on? Cube? A custom one? What's the purpose of "boot_stm32l4xx.c"?

GrumpyOldPizza commented 7 years ago

(1) Custom system level code. No SPL, no Cube other than USB/PCD support

(2) OTA (IAP), preboot checking (gateway to USB/DFU loader, RTC setup).

On Fri, Apr 21, 2017 at 10:55 AM, edogaldo notifications@github.com wrote:

Which is the reference library you rely on? SPL? Cube? A custom one? What's the purpose of "boot_stm32l4xx.c"?

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edogaldo commented 7 years ago

Thank you! Another question: I was investigating the Reset_Handler and I don't understand the branches targets, i.e.:

        b.n     3f
        ...
        bne.n   1b
        ...
        b.n     6f
        etc...

What are 1b, 3f, 6f etc.?! they are not labels, are they?!

GrumpyOldPizza commented 7 years ago

Which file are you referring to ? boot_stm32l4xx is the preboot code. It that succeeds it branches to the rest reset code which is located somewhere else.

On Fri, Apr 21, 2017 at 11:24 AM, edogaldo notifications@github.com wrote:

Thank you! Another question: I was investigating the Reset_Handler and I don't understand the branches targets, i.e.: b.n 3f ... bne.n 1b ... b.n 6f etc...

What are 1b, 3f, 6f etc.?! they are not labels, are they?!

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/GrumpyOldPizza/arduino-STM32L4/issues/11#issuecomment-296252411, or mute the thread https://github.com/notifications/unsubscribe-auth/AG4QfHsKGPCuR_EXzHLxTw4DywFrRxBvks5ryOY7gaJpZM4NEi89 .

edogaldo commented 7 years ago

Sorry, no, now I'm referring to startup_stm32l476xx.S Il 21/apr/2017 20:07, "Thomas Roell" notifications@github.com ha scritto:

Which file are you referring to ? boot_stm32l4xx is the preboot code. It that succeeds it branches to the rest reset code which is located somewhere else.

On Fri, Apr 21, 2017 at 11:24 AM, edogaldo notifications@github.com wrote:

Thank you! Another question: I was investigating the Reset_Handler and I don't understand the branches targets, i.e.: b.n 3f ... bne.n 1b ... b.n 6f etc...

What are 1b, 3f, 6f etc.?! they are not labels, are they?!

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/GrumpyOldPizza/arduino-STM32L4/issues/11# issuecomment-296252411, or mute the thread https://github.com/notifications/unsubscribe-auth/AG4QfHsKGPCuR_ EXzHLxTw4DywFrRxBvks5ryOY7gaJpZM4NEi89 .

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GrumpyOldPizza commented 7 years ago

Ok, those are just normal assembly labels ... 6f == 6th label forward ...

On Fri, Apr 21, 2017 at 12:19 PM, edogaldo notifications@github.com wrote:

Sorry, no, now I'm referring to startup_stm32l476xx.S Il 21/apr/2017 20:07, "Thomas Roell" notifications@github.com ha scritto:

Which file are you referring to ? boot_stm32l4xx is the preboot code. It that succeeds it branches to the rest reset code which is located somewhere else.

On Fri, Apr 21, 2017 at 11:24 AM, edogaldo notifications@github.com wrote:

Thank you! Another question: I was investigating the Reset_Handler and I don't understand the branches targets, i.e.: b.n 3f ... bne.n 1b ... b.n 6f etc...

What are 1b, 3f, 6f etc.?! they are not labels, are they?!

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/GrumpyOldPizza/arduino-STM32L4/issues/11# issuecomment-296252411, or mute the thread https://github.com/notifications/unsubscribe-auth/AG4QfHsKGPCuR_ EXzHLxTw4DywFrRxBvks5ryOY7gaJpZM4NEi89 .

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/GrumpyOldPizza/arduino-STM32L4/issues/11# issuecomment-296262847, or mute the thread https://github.com/notifications/unsubscribe-auth/ ATTZbh4RdPBbNHETXu74eMEjLkEHd3bWks5ryPBmgaJpZM4NEi89 .

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edogaldo commented 7 years ago

Thank you! I didn't know that notation..

Il 21 Apr 2017 20:47, "Thomas Roell" notifications@github.com ha scritto:

Ok, those are just normal assembly labels ... 6f == 6th label forward ...

On Fri, Apr 21, 2017 at 12:19 PM, edogaldo notifications@github.com wrote:

Sorry, no, now I'm referring to startup_stm32l476xx.S Il 21/apr/2017 20:07, "Thomas Roell" notifications@github.com ha scritto:

Which file are you referring to ? boot_stm32l4xx is the preboot code. It that succeeds it branches to the rest reset code which is located somewhere else.

On Fri, Apr 21, 2017 at 11:24 AM, edogaldo notifications@github.com wrote:

Thank you! Another question: I was investigating the Reset_Handler and I don't understand the branches targets, i.e.: b.n 3f ... bne.n 1b ... b.n 6f etc...

What are 1b, 3f, 6f etc.?! they are not labels, are they?!

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/GrumpyOldPizza/arduino-STM32L4/issues/11# issuecomment-296252411, or mute the thread https://github.com/notifications/unsubscribe-auth/AG4QfHsKGPCuR_ EXzHLxTw4DywFrRxBvks5ryOY7gaJpZM4NEi89 .

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/GrumpyOldPizza/arduino-STM32L4/issues/11# issuecomment-296262847,

or mute the thread https://github.com/notifications/unsubscribe-auth/ ATTZbh4RdPBbNHETXu74eMEjLkEHd3bWks5ryPBmgaJpZM4NEi89 .

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