diff --git a/embassy-stm32/src/spi/v3.rs b/embassy-stm32/src/spi/v3.rs index cfee54dac..b0e57254e 100644 --- a/embassy-stm32/src/spi/v3.rs +++ b/embassy-stm32/src/spi/v3.rs @@ -171,6 +171,7 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> { w.set_dsize(word_size.dsize()); }); T::regs().cr1().modify(|w| { + w.set_csusp(false); w.set_spe(true); }); } @@ -375,8 +376,19 @@ impl<'d, T: Instance> embedded_hal::blocking::spi::Write for Spi<'d, T, NoDm } if !sr.txp() { // loop waiting for TXE + continue; } + break; } + unsafe { + let rxdr = regs.rxdr().ptr() as *const u8; + // discard read to prevent pverrun. + let _ = ptr::read_volatile(rxdr); + } + } + + while unsafe { !regs.sr().read().txc() } { + // spin } Ok(()) @@ -469,8 +481,20 @@ impl<'d, T: Instance> embedded_hal::blocking::spi::Write for Spi<'d, T, NoD } if !sr.txp() { // loop waiting for TXE + continue; } + break; } + + unsafe { + let rxdr = regs.rxdr().ptr() as *const u8; + // discard read to prevent pverrun. + let _ = ptr::read_volatile(rxdr); + } + } + + while unsafe { !regs.sr().read().txc() } { + // spin } Ok(())