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Hello sir
Thank you so much for your help!
In your topic PCF8574 you give as an example a link to a Japanese author “nopnop”.
It’s very interesting, but I’m a novice, and I don’t understand the meaning of this line of code:
Could you explain to me the meaning of the two ::?PCF8574 :: DigitalInput val = pcf8574.digitalReadAll ();
Slowly please 🙂 like a child
I’m just starting out, and it’s been fifteen days that I browse the websites, and in fact I’m going from one problem to another. the syntax of C is difficult.
Thank you anyway and long life to your blog -
Hi Turnoff,
you can understand the syntax when you check the structure of the PCF8574 class:class PCF8574 { [...] struct DigitalInput { uint8_t p0; uint8_t p1; uint8_t p2; uint8_t p3; uint8_t p4; uint8_t p5; uint8_t p6; uint8_t p7; } digitalInput; [...] }there is a structure DigitalInput declared inside the PCF8574 class declaration, so to reference the Object inside It you must use
::notation.PCF8574::DigitalInput
I hope I was clear.
Bye Renzo
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