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arduino_blinkrs
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low_level
kirbylife 2022-12-10 23:48:27 -06:00
parent 76102d28a4
commit 24daab9c17
1 changed files with 14 additions and 0 deletions
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src/main.rs
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@ -5,16 +5,30 @@
use core::arch::asm; use core::arch::asm;
use core::ptr::{read_volatile, write_volatile}; use core::ptr::{read_volatile, write_volatile};
/*
PORTC{0..5} Analog
PORTC6 Reset
PORTB{0..5} Digital {8..13}
PORTD{0..7} Digital {0..7}
PORTB5 LED_BUILTIN
*/
const DDRB: *mut u8 = 0x24 as *mut u8; const DDRB: *mut u8 = 0x24 as *mut u8;
const PORTB: *mut u8 = 0x25 as *mut u8; const PORTB: *mut u8 = 0x25 as *mut u8;
// ATmega328p cycle speed
const CPU_SPEED: u32 = 16_000_000; const CPU_SPEED: u32 = 16_000_000;
#[no_mangle] #[no_mangle]
pub extern "C" fn main() -> ! { pub extern "C" fn main() -> ! {
// Set all the B pins on OUTPUT mode
unsafe { write_volatile(DDRB, 0b11111111) }; unsafe { write_volatile(DDRB, 0b11111111) };
loop { loop {
// if pin[5] == 1: 1^1 = 0
// if pin[5] == 0: 0^1 = 1
let mut portb_value = unsafe { read_volatile(PORTB) }; let mut portb_value = unsafe { read_volatile(PORTB) };
portb_value = portb_value ^ (1 << 5); portb_value = portb_value ^ (1 << 5);
unsafe { write_volatile(PORTB, portb_value) }; unsafe { write_volatile(PORTB, portb_value) };