70 lines
1.6 KiB
Rust
70 lines
1.6 KiB
Rust
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#![no_std]
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#![no_main]
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use defmt_rtt as _;
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use panic_probe as _;
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use stm32_metapac as pac;
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use pac::gpio::vals;
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#[cortex_m_rt::entry]
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fn main() -> ! {
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// Enable GPIO clock
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let rcc = pac::RCC;
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unsafe {
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rcc.ahb2enr().modify(|w| {
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w.set_gpioben(true);
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w.set_gpiocen(true);
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});
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rcc.ahb2rstr().modify(|w| {
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w.set_gpiobrst(true);
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w.set_gpiocrst(true);
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w.set_gpiobrst(false);
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w.set_gpiocrst(false);
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});
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}
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// Setup button
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let gpioc = pac::GPIOC;
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const BUTTON_PIN: usize = 13;
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unsafe {
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gpioc
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.pupdr()
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.modify(|w| w.set_pupdr(BUTTON_PIN, vals::Pupdr::PULLUP));
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gpioc
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.otyper()
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.modify(|w| w.set_ot(BUTTON_PIN, vals::Ot::PUSHPULL));
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gpioc
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.moder()
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.modify(|w| w.set_moder(BUTTON_PIN, vals::Moder::INPUT));
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}
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// Setup LED
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let gpiob = pac::GPIOB;
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const LED_PIN: usize = 14;
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unsafe {
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gpiob
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.pupdr()
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.modify(|w| w.set_pupdr(LED_PIN, vals::Pupdr::FLOATING));
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gpiob
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.otyper()
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.modify(|w| w.set_ot(LED_PIN, vals::Ot::PUSHPULL));
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gpiob
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.moder()
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.modify(|w| w.set_moder(LED_PIN, vals::Moder::OUTPUT));
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}
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// Main loop
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loop {
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unsafe {
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if gpioc.idr().read().idr(BUTTON_PIN) == vals::Idr::LOW {
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gpiob.bsrr().write(|w| w.set_bs(LED_PIN, true));
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} else {
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gpiob.bsrr().write(|w| w.set_br(LED_PIN, true));
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}
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}
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}
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}
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