Debug - Print GPIOA->BSSR register

[ee06091]

Posted on September 07, 2013 at 00:56

Hi,

How can I print the GPIOA->BSSR register using gdb? I tried to p using the register address but with no success:

1. (

   gdb

   )

    n

2. 67

                 GPIOC->BSRR = 

   GPIO_Pin_9;

3. (

   gdb

   )

    p/x *

   (

   0x40010800

    + 

   0x10

   )

4. $6 = 

   0x0

5. (

   gdb

   )

    n

7. Breakpoint 

   1

   , 

   main

    

   (

   )

    at 

   main.c

   :

   68

8. 68

                 GPIOC->BRR = 

   GPIO_Pin_9;

9. (

   gdb

   )

    p/x *

   (

   0x40010800

    + 

   0x10

   )

10. $7 = 

    0x0

11. (

    gdb

    )

The pin is configured as the led in the board change the state.Thanks 🙂

[Tesla DeLorean]

Posted on September 07, 2013 at 01:16

Just read ODR if you want to know the current driver state. BSRR uses some combinatorial logic to RMW the ODR via a single atomic write, it's not designed to be readable. It's a peripheral register, and may not behave like memory/RAM.

[ee06091]

Posted on September 07, 2013 at 01:29

even with ODR it doesn't work:

1. (

   gdb

   )

    n

2. 65

                 GPIOC->BSRR = 

   GPIO_Pin_9;

3. (

   gdb

   )

    p/x *

   (

   0x40010800

   +

   0x0c

   )

4. $5 = 

   0xa800

5. (

   gdb

   )

    n

6. 66

                 GPIOC->BRR = 

   GPIO_Pin_9;

7. (

   gdb

   )

    p/x *

   (

   0x40010800

   +

   0x0c

   )

8. $6 = 

   0xa800

9. (

   gdb

   )

I'm not trying to read in the software but with GDB

[Tesla DeLorean]

Posted on September 07, 2013 at 04:28

What part is this?

GPIOC->ODR on an F1 is 0x4001100C GPIOC->ODR on an F3 is 0x48000814

[ee06091]

Posted on September 07, 2013 at 04:52

Doesn't understand your question :s

sorry my english

[Tesla DeLorean]

Posted on September 07, 2013 at 05:18

I don't think you're looking at the right address for GPIOC->ODR

Which STM32 part are we talking about?