Review
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Setup enviroment for learning embeded systems with arduino, esp8266, raspberry pi
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setup
brew install avrdude
brew tap osx-cross/avr
brew install avr-gcc- to compile and write hex to arduino
avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o intro.o intro.c
avr-gcc -mmcu=atmega328p intro.o -o intro
avr-objcopy -O ihex -R .eeprom intro intro.hex
avrdude -F -V -c arduino -p ATMEGA328P -P /dev/cu.usbmodem141101 -b 115200 -U flash:w:intro.hex
#include <avr/io.h>
#include <util/delay.h>
void pin5Off() {
PORTB &= ~_BV(PORTB5);
}
void pin5On() {
PORTB |= _BV(PORTB5);
}
int main (void)
{
// set pin 5 of PORTB for output
DDRB |= _BV(DDB5);
int i = 0;
while(i < 5) {
// set pin 5 low to turn led off
pin5Off();
_delay_ms(500);
// set pin 5 high to turn led on
pin5On();
_delay_ms(500);
i += 1;
}
// set pin 5 low to turn led off
pin5Off();
return 0;
}void writeString(char *str) {
while (*str)
write(0, str++, 1);
}
void copyInputToOutput() {
int c;
c = getchar();
while (c != EOF) {
if (c == 100) {
break;
}
putchar(c);
c = getchar();
}
}int power(int, int);
int power(int base, int n)
{
int p = 1;
int i = 0;
for (i = 1; i <= n; i++)
p *= base;
return p;
}void swap(int *a, int *b)
{
int temp = *a;
*a = *b;
*b = temp;
}
char* reverseString(char *str, int length)
{
char* reverseStr = (char*)malloc(length + 1);
for (int i = 0; i < length; i++) {
reverseStr[i] = str[length - 1 - i];
}
reverseStr[length] = 0;
return reverseStr;
}