stm32/dma: impl all variants

embassy-stm32/src/dma/dmamux.rs

@@ -0,0 +1,61 @@
+#![macro_use]
+
+use crate::pac;
+use crate::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) trait MuxChannel {
+    const DMAMUX_CH_NUM: u8;
+    const DMAMUX_REGS: pac::dmamux::Dmamux;
+}
+
+macro_rules! dma_num {
+    (DMA1) => {
+        0
+    };
+    (DMA2) => {
+        1
+    };
+    (BDMA) => {
+        0
+    };
+}
+
+macro_rules! dmamux_peri {
+    (DMA1) => {
+        crate::pac::DMAMUX1
+    };
+    (DMA2) => {
+        crate::pac::DMAMUX1
+    };
+    (BDMA) => {
+        crate::pac::DMAMUX1
+    };
+}
+
+pac::bdma_channels! {
+    ($channel_peri:ident, $dma_peri:ident, $channel_num:expr) => {
+        impl MuxChannel for peripherals::$channel_peri {
+            const DMAMUX_CH_NUM: u8 = (dma_num!($dma_peri) * 8) + $channel_num;
+            const DMAMUX_REGS: pac::dmamux::Dmamux = dmamux_peri!($dma_peri);
+        }
+    };
+}
+
+/// safety: must be called only once
+pub(crate) unsafe fn init() {}