Difference in pin defines?

[Mangy_Dog]

Hi I've ran into a strange issue.
When wanting to read an analogue value from PB0 or PB1. I've had to use the defines PB0/1 but PB_0 and PB_1 will always return 0...

While PA_4 and PA_5 will return analogue values.

I'm trying to understand why that's the case, and if that could be a bug?

I had thought P## and P_## were meant to be interchangeable?
This is on the F030RCT6.

Thanks.

[fpiSTM]

Hi I've ran into a strange issue.
When wanting to read an analogue value from PB0 or PB1. I've had to use the defines PB0/1 but PB_0 and PB_1 will always return 0...

While PA_4 and PA_5 will return analogue values.

I'm trying to understand why that's the case, and if that could be a bug?

I had thought P## and P_## were meant to be interchangeable?
This is on the F030RCT6.

Thanks.

Totally wrong.

PY_n is a PinName which is a concatenation of "GPIO_port << 4 | GPIO_PIN".
Ex:

Code: Select all

  // Pin name definition
  PA_0  = (PortA << 4) + 0x00,

PYn is a pin number like Dx or x.

In some case they can be equal, ex for a generic variant, PA0 is the pin number 0 so it matches. But if PA0 is not 0 on other variant it is not the same.

Always use pin number (PYn) with the standard Arduino API, the it is used to find the PinName (PY_n).
You can use the PinName for some extra API, simply check the prototype.