[PLUG] Arduino Syntax Questions

[Casey Bralla via plug <plug@lists.phillylinux.org>]

I've been working with some auduino boards lately, and have come across some published programs that contain syntax that I do not understand.  I've checked multiple on-line references, and haven't found a good reference to explain what is going on.  Maybe someone here can help?

Here's are some examples of program statements that I don't understand.  These all have to do with setting internal timer registers in a SAMD21 processor on an Arduino Nano 33 IoT board.

From an interrupt routine:

• TC5->COUNT16.INTFLAG.bit.MC0 = 1;       //Writing a 1 to INTFLAG.bit.MC0 clears the interrupt so that it will run again
• GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID(GCM_TC4_TC5)) ;

So my questions:

1. what does the "->" signify?
2. What is the "|" character telling me about the assignment statement?

TIA!

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