Clean up remaining examples, move some to "raw" examples

1 files changed, 129 insertions, 0 deletions

diff --git a/examples/mcxa/src/bin/raw_dma_memset.rs b/examples/mcxa/src/bin/raw_dma_memset.rs
new file mode 100644
index 000000000..7b3c06ffa
--- /dev/null
+++ b/examples/mcxa/src/bin/raw_dma_memset.rs
@@ -0,0 +1,129 @@
+//! DMA memset example for MCXA276.
+//!
+//! NOTE: this is a "raw dma" example! It exists as a proof of concept, as we don't have
+//! a high-level and safe API for. It should not be taken as typical, recommended, or
+//! stable usage!
+//!
+//! This example demonstrates using DMA to fill a buffer with a repeated pattern.
+//! The source address stays fixed while the destination increments.
+//!
+//! # Embassy-style features demonstrated:
+//! - `DmaChannel::is_done()` and `clear_done()` helper methods
+//! - No need to pass register block around
+
+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use embassy_mcxa::clocks::config::Div8;
+use embassy_mcxa::dma::DmaChannel;
+use static_cell::ConstStaticCell;
+use {defmt_rtt as _, embassy_mcxa as hal, panic_probe as _};
+
+const BUFFER_LENGTH: usize = 4;
+
+// Buffers in RAM
+static PATTERN: u32 = 0xDEADBEEF;
+static DEST_BUFFER: ConstStaticCell<[u32; BUFFER_LENGTH]> = ConstStaticCell::new([0; BUFFER_LENGTH]);
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    // Small delay to allow probe-rs to attach after reset
+    for _ in 0..100_000 {
+        cortex_m::asm::nop();
+    }
+
+    let mut cfg = hal::config::Config::default();
+    cfg.clock_cfg.sirc.fro_12m_enabled = true;
+    cfg.clock_cfg.sirc.fro_lf_div = Some(Div8::no_div());
+    let p = hal::init(cfg);
+
+    defmt::info!("DMA memset example starting...");
+    defmt::info!("EDMA memset example begin.");
+
+    // Initialize buffers
+    let pat = &PATTERN;
+    let dst = DEST_BUFFER.take();
+    defmt::info!("Pattern Value: {=u32}", pat);
+    defmt::info!("Destination Buffer (before): {=[?]}", dst.as_slice());
+    defmt::info!("Configuring DMA with Embassy-style API...");
+
+    // Create DMA channel using Embassy-style API
+    let dma_ch0 = DmaChannel::new(p.DMA_CH0);
+
+    // Configure memset transfer using direct TCD access:
+    // Source stays fixed (soff = 0, reads same pattern repeatedly)
+    // Destination increments (doff = 4)
+    unsafe {
+        let t = dma_ch0.tcd();
+
+        // Reset channel state
+        t.ch_csr().write(|w| {
+            w.erq()
+                .disable()
+                .earq()
+                .disable()
+                .eei()
+                .no_error()
+                .ebw()
+                .disable()
+                .done()
+                .clear_bit_by_one()
+        });
+        t.ch_es().write(|w| w.bits(0));
+        t.ch_int().write(|w| w.int().clear_bit_by_one());
+
+        // Source address (pattern) - fixed
+        t.tcd_saddr().write(|w| w.saddr().bits(pat as *const _ as u32));
+        // Destination address - increments
+        t.tcd_daddr().write(|w| w.daddr().bits(dst.as_mut_ptr() as u32));
+
+        // Source offset = 0 (stays fixed), Dest offset = 4 (increments)
+        t.tcd_soff().write(|w| w.soff().bits(0));
+        t.tcd_doff().write(|w| w.doff().bits(4));
+
+        // Attributes: 32-bit transfers (size = 2)
+        t.tcd_attr().write(|w| w.ssize().bits(2).dsize().bits(2));
+
+        // Transfer entire buffer in one minor loop
+        let nbytes = (BUFFER_LENGTH * 4) as u32;
+        t.tcd_nbytes_mloffno().write(|w| w.nbytes().bits(nbytes));
+
+        // Source doesn't need adjustment (stays fixed)
+        t.tcd_slast_sda().write(|w| w.slast_sda().bits(0));
+        // Reset dest address after major loop
+        t.tcd_dlast_sga().write(|w| w.dlast_sga().bits(-(nbytes as i32) as u32));
+
+        // Major loop count = 1
+        t.tcd_biter_elinkno().write(|w| w.biter().bits(1));
+        t.tcd_citer_elinkno().write(|w| w.citer().bits(1));
+
+        // Enable interrupt on major loop completion
+        t.tcd_csr().write(|w| w.intmajor().set_bit());
+
+        cortex_m::asm::dsb();
+
+        defmt::info!("Triggering transfer...");
+        dma_ch0.trigger_start();
+    }
+
+    // Wait for completion using channel helper method
+    while !dma_ch0.is_done() {
+        cortex_m::asm::nop();
+    }
+    unsafe {
+        dma_ch0.clear_done();
+    }
+
+    defmt::info!("EDMA memset example finish.");
+    defmt::info!("Destination Buffer (after): {=[?]}", dst.as_slice());
+
+    // Verify: All elements should equal PATTERN
+    let mismatch = dst.iter().any(|i| *i != *pat);
+
+    if mismatch {
+        defmt::error!("FAIL: Mismatch detected!");
+    } else {
+        defmt::info!("PASS: Data verified.");
+    }
+}