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- //! Serial interface circular DMA RX transfer test
- #![deny(unsafe_code)]
- #![no_std]
- #![no_main]
- use panic_halt as _;
- use cortex_m::{asm, singleton};
- use cortex_m_rt::entry;
- use stm32f1xx_hal::{
- dma::Half,
- pac,
- prelude::*,
- serial::{Config, Serial},
- };
- #[entry]
- fn main() -> ! {
- let p = pac::Peripherals::take().unwrap();
- let mut flash = p.FLASH.constrain();
- let mut rcc = p.RCC.constrain();
- let clocks = rcc.cfgr.freeze(&mut flash.acr);
- let mut afio = p.AFIO.constrain(&mut rcc.apb2);
- let channels = p.DMA1.split(&mut rcc.ahb);
- let mut gpioa = p.GPIOA.split(&mut rcc.apb2);
- // let mut gpiob = p.GPIOB.split(&mut rcc.apb2);
- // USART1
- let tx = gpioa.pa9.into_alternate_push_pull(&mut gpioa.crh);
- let rx = gpioa.pa10;
- // USART1
- // let tx = gpiob.pb6.into_alternate_push_pull(&mut gpiob.crl);
- // let rx = gpiob.pb7;
- // USART2
- // let tx = gpioa.pa2.into_alternate_push_pull(&mut gpioa.crl);
- // let rx = gpioa.pa3;
- // USART3
- // let tx = gpiob.pb10.into_alternate_push_pull(&mut gpiob.crh);
- // let rx = gpiob.pb11;
- let serial = Serial::usart1(
- p.USART1,
- (tx, rx),
- &mut afio.mapr,
- Config::default().baudrate(9_600.bps()),
- clocks,
- &mut rcc.apb2,
- );
- let rx = serial.split().1.with_dma(channels.5);
- let buf = singleton!(: [[u8; 8]; 2] = [[0; 8]; 2]).unwrap();
- let mut circ_buffer = rx.circ_read(buf);
- while circ_buffer.readable_half().unwrap() != Half::First {}
- let _first_half = circ_buffer.peek(|half, _| *half).unwrap();
- while circ_buffer.readable_half().unwrap() != Half::Second {}
- let _second_half = circ_buffer.peek(|half, _| *half).unwrap();
- asm::bkpt();
- loop {}
- }
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