embassy/embassy-stm32/src/dma/dmamux.rs

#![macro_use]

use crate::{pac, peripherals};

pub(crate) unsafe fn configure_dmamux(dmamux_regs: pac::dmamux::Dmamux, dmamux_ch_num: u8, request: u8) {
    let ch_mux_regs = dmamux_regs.ccr(dmamux_ch_num as _);
    ch_mux_regs.write(|reg| {
        reg.set_nbreq(0);
        reg.set_dmareq_id(request);
    });

    ch_mux_regs.modify(|reg| {
        reg.set_ege(true);
    });
}

pub(crate) mod sealed {
    use super::*;
    pub trait MuxChannel {
        const DMAMUX_CH_NUM: u8;
        const DMAMUX_REGS: pac::dmamux::Dmamux;
    }
}

pub struct DMAMUX1;
#[cfg(stm32h7)]
pub struct DMAMUX2;

pub trait MuxChannel: sealed::MuxChannel + super::Channel {
    type Mux;
}

foreach_dma_channel! {
    ($channel_peri:ident, $dma_peri:ident, $version:ident, $channel_num:expr, $index:expr, {dmamux: $dmamux:ident, dmamux_channel: $dmamux_channel:expr}) => {
        impl sealed::MuxChannel for peripherals::$channel_peri {
            const DMAMUX_CH_NUM: u8 = $dmamux_channel;
            const DMAMUX_REGS: pac::dmamux::Dmamux = pac::$dmamux;
        }
        impl MuxChannel for peripherals::$channel_peri {
            type Mux = $dmamux;
        }
    };
}

/// safety: must be called only once
pub(crate) unsafe fn init() {
    crate::_generated::init_dmamux();
}