Debug - Print GPIOA->BSSR register

ee06091 · ‎2013-09-06

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:

(
gdb
)
n
67
GPIOC->BSRR =
GPIO_Pin_9;
(
gdb
)
p/x *
(
0x40010800
+
0x10
)
$6 =
0x0
(
gdb
)
n
Breakpoint
1
,
main

(
)
at
main.c
:
68
68
GPIOC->BRR =
GPIO_Pin_9;
(
gdb
)
p/x *
(
0x40010800
+
0x10
)
$7 =
0x0
(
gdb
)

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

Thanks :)

Tesla DeLorean · ‎2013-09-06

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.

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ee06091 · ‎2013-09-06

Posted on September 07, 2013 at 01:29

even with ODR it doesn't work:

(
gdb
)
n
65
GPIOC->BSRR =
GPIO_Pin_9;
(
gdb
)
p/x *
(
0x40010800
+
0x0c
)
$5 =
0xa800
(
gdb
)
n
66
GPIOC->BRR =
GPIO_Pin_9;
(
gdb
)
p/x *
(
0x40010800
+
0x0c
)
$6 =
0xa800
(
gdb
)

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

Tesla DeLorean · ‎2013-09-06

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

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ee06091 · ‎2013-09-06

Posted on September 07, 2013 at 04:52

Doesn't understand your question :s

sorry my english

Tesla DeLorean · ‎2013-09-06

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?

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