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hugo1
hugo1
Associate II
Feb 22, 2019 9:18 AM UTC
Question

STM32L151RC GPIO BRR register missing?

Hi,

to clear bit 7 in port C I used a write to the BRR register: GPIOC->BRR = 0x00000080. Did not clear bit 7. A write to BSRR works: GPIOC->BSRR = 0x00800000. Is the BRR register not implemented (seems kind of redundant anyway with having BSRR)? It certainly is included in the header file. Could not see anything in the Errata sheet either. Or am I missing something?

Kind Regards,

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6 replies

After Forever
After Forever
Senior III
Feb 22, 2019 9:25 AM UTC

From the reference manual (RM0038):

GPIO bit reset register (GPIOx_BRR) (x = A..H)

These registers are available on Cat.3, Cat.4, Cat.5 and Cat.6 products only.

Imen.D
ST Technical Moderator
Apr 30, 2019 10:48 AM UTC

Hello,

BRR register is not in Cat.3.

The reference manual RM0038 will be updated to correct in chapter: "7.4.11 GPIO bit reset register (GPIOx_BRR) (x = A..H)":

- Remove "Cat.3" from description. So final sentence should be: These registers are available on Cat.4, Cat.5 and Cat.6 products only.

I raised this issue internally for fix.

Thanks,

Imen

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hugo1
hugo1Author
Associate II
Feb 22, 2019 9:35 AM UTC

Yes, I know that. According to the table on page 40 of the data sheet the STM32L151RC is a Cat.3 device.

hugo1
hugo1Author
Associate II
Feb 22, 2019 9:37 AM UTC

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waclawek.jan
waclawek.jan
Super User
Feb 22, 2019 11:20 AM UTC

What's the value of DBGMCU_IDCODE ?

JW

hugo1
hugo1Author
Associate II
Feb 22, 2019 11:55 AM UTC

Hi,

DBGMCU->IDCODE is 0x10f86427

Kind Regards,

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