Question

1a) We want you to feel comfortable reading documentation to understand the operation of a device. To that end, open the ATmega328/P datasheet linked on our website from the Tools and Links Page. Go to section 18.2 and read over pages 98-99. Note that "toggle" means flip to its opposite value, regardless of current value.

What effect does writing a 1 to a PIN register bit have? Consider, how this might be used to generate the E signal pulse in your lcd_writenibble() function. Re-write the 3 lines of code you had to generate the E signal pulse for about 250 ns using the feature of writing a 1 to a PIN register bit. You may leave the middle line that is intended to simply delay as is. So just show
the first line (statement) that turns the E signal on and then the last line that turns it off. Make sure you use the correct register, masking, etc. (Just fill in the blank).

PINB _____________________
PORTB |= (1 << PB1); // original line to simply delay
PINB _____________________

1b) Suppose we need to perform 3 concurrent tasks intermittently: Task A every 20 ms, Task B every 15 ms, and Task C every 40 ms. What delay should be used on each iteration of the main loop?

Answer 1

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