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adds more comments regarding ddrx and portx registers 

adds resulting rebuild of the project
This commit is contained in:
ergz 2022-07-30 15:30:12 -07:00
parent 6656bab59e
commit 3d6a744aac
5 changed files with 33 additions and 20 deletions
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blink/blink.elf
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blink/blink.hex
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@ -5,8 +5,8 @@
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blink/blink.map
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@ -222,7 +222,7 @@ END GROUP
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19
blink/blinkled.c
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@ -5,15 +5,28 @@
int main(void) int main(void)
{ {
// set the lowest order bit /*
the DDRX registers are used to indicated whether each pin
is being used for input or output (data direction)
to enable a pin as output you set its corresponding bit to 1,
the default state is 0 (input)
*/
DDRB |= 0b00000001; DDRB |= 0b00000001;
while (1) { while (1) {
/*
When DDRx is set to 1 (output):
PORTx controls whether that port register is set to high or low.
When DDRx is set to 0 (input) it is essentially disconnected
from the circuit
*/
PORTB = 0b00000001; // turn on the LED PORTB = 0b00000001; // turn on the LED
_delay_ms(100); _delay_ms(50);
PORTB = 0b00000000; PORTB = 0b00000000;
_delay_ms(100); _delay_ms(1000);
} }

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