About JTang.1

JTang.1 · 2020-03-12

I am using the STM32F4 family. I have configured a GPIO pin as output push pull with no pullups. Speed is also set to low frequency. On some occasions, the GPIO pin seems to switch polarity on its own eg. when I set to low, it will sometimes switch i...

JTang.1 · 2020-03-17

To cut a long story short, I found the problem. Basically, the GPIO is set/reset in the code during interrupt. Now, setting/resetting using the HAL_GPIO_WritePin is atomic thus should be interrupt safe. However, the corresponding HAL_GPIO_TogglePin i...

JTang.1 · 2020-03-14

Here's the even more bizarre part, I added some code to test the ODR bit for GPIOG in 6 and the code never trips! I have run it over 8000 cycles and it hasn't tripped up. Because of this, I haven't yet run this in debugger mode to try to unroll the i...

JTang.1 · 2020-03-12

This is on Port G, Pin 6. I did not check the ODR for the bit change but read back on the BSRR bit for the pin confirms the change.I have even wired it to an external interrupt pin to catch it and I have been able to catch it changing.What else can I...

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Bizarre GPIO behaviour: HAL_GPIO_TogglePin() doesn't allow toggle multiple pins

Re: Bizarre GPIO behaviour: HAL_GPIO_TogglePin() doesn't allow toggle multiple pins

Re: Bizarre GPIO behaviour: HAL_GPIO_TogglePin() doesn't allow toggle multiple pins

Re: Bizarre GPIO behaviour: HAL_GPIO_TogglePin() doesn't allow toggle multiple pins