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I want to start on a new project. I would like to use the hardware timer to send a signal, so I think PWM_FullConfiguration.ino will be a good starting point. However I would like it to be an open drain output. The example states: So will it work if I would add this to the code? If so, where to add it? |
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Replies: 1 comment · 7 replies
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Hi @ericwoud Not the one linked to STM32Examples: So you should ask on the forum in the dedicated libmaple core section: |
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Yes, overwriting the weak |
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I was thinking of transforming one existing HDMI-CEC library to use a hardware timer and interrupts. Because I want to minimize the hardware, I am going to use a stm32(f4), because it has open drain outputs, where many other boards do not. I can connect the CEC pin directly to a pin, switching it between input without pullup and open collector output. I have ordered 2 stm32f401's so I hope I can start soon. |
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I have ordered the STM32F401CCU6, meaning I would need: Let's say I want pin PA_2 on timer 5, I see: I would need to change it to: Should this be good enough to make sure I never activate the input pullup, or even worse, force the output to high voltage? |
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Yes that sound good. Did you know that some STM32 MCU support Hardware HDMI-CEC ? |
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I know, also some STM32F0xx, but it is not as cheap and available as the STM32F401. |
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Hi @ericwoud
it seems you used this core: https://github.com/rogerclarkmelbourne/Arduino_STM32
https://github.com/rogerclarkmelbourne/Arduino_STM32/blob/341cd894516f747f14108de5da593dad99900ae0/STM32F1/cores/maple/libmaple/gpio_f1.c#L124
Not the one linked to STM32Examples:
https://github.com/stm32duino/Arduino_Core_STM32
which do not have
gpio_set_modeSo you should ask on the forum in the dedicated libmaple core section:
https://www.stm32duino.com/viewforum.php?f=63