Can CC2541 support 10 external interrupts?

chenbingjy

Can CC2541 support 10 external interrupts? [Copy link]

I want to use CC2541 to make a remote control with 10 buttons, low power sleep, and external interrupt wake-up.

I have a question, the STM32 external interrupt IO port numbers cannot be repeated. For example, PA5 and PB5 cannot be used together.

CC2541 P0, P1, P2 only have 8 IO ports. I would like to ask, if there are 10 buttons and 10 external interrupts, will it work?

Will they interfere with each other? Thank you!

chunyang

If the MCU supports so many external interrupts, then of course they can be used directly. The interrupts will not interfere with each other, but there will be priorities. However, I have not seen or even heard of an MCU that supports so many external interrupts. In fact, there is no need for so many external interrupts. One is enough. The buttons can summarize the interrupt requests through the logic circuit. Some MCUs support multiple input external interrupt sources, but there is only one interrupt. In fact, the same method is used, but it is integrated into the internal.

chenbingjy

chunyang posted on 2019-8-24 13:51 If the MCU supports so many external interrupts, then of course you can use them directly, the interrupts will not interfere with each other, but there will be priorities. However, an MCU that supports so many external interrupts ...

Thank you! Doesn't STM32 have many external interrupts, from 0 to 15?

chunyang

chenbingjy posted on 2019-8-24 14:01 Thank you! Isn't there a lot of STM32 external interrupts, from 0 to 15.

If your model has it, use it.

chenbingjy

chunyang posted on 2019-8-24 18:21 If the model you are using has it, just use it.

Got it. I asked the customer service and they said it was possible.

chunyang

I checked and found that different ports of STM32 cannot enable external interrupts at the same time because the internal interrupt processing circuit is shared, as I mentioned in my previous post. Although this situation can provide external interrupts for all IOs in a time-sharing manner, it cannot be truly simultaneous. In view of this, you need to pay close attention to your program structure and enable external interrupts for different ports in turn. In other words, your PA and PB ports must enable interrupts in turn, and the time must be short enough to simulate full IO interrupts.

chunyang

chenbingjy posted on 2019-8-24 18:25 Got it. I asked the customer service and they said it was OK.

I'm afraid the customer service won't know the technical details...

chenbingjy

chunyang posted on 2019-8-24 18:36 I checked and found that different ports of STM32 cannot enable external interrupts at the same time because the internal interrupt processing circuit is shared, as I mentioned in my previous post. This...

I have tried it, and it works as long as the corresponding number of the IO port is different.

For example, I use STM32L151C8T6, which has 10 external interrupt ports.

12345678...

PA and PB can be mixed as long as the numbers are not repeated.

For example, I use PA1, PB2, PA3, PB4, PA5, PB6... like this.

chenbingjy

chunyang posted on 2019-8-24 19:03 I'm afraid the customer service doesn't know the technical details...

Technical customer service.

chunyang

chenbingjy posted on 2019-8-24 19:30 Technical customer service.

I can only laugh...