//! 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 {} }