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Priec
2025-10-31 23:04:48 +01:00
parent 1a4c071417
commit f24bd73c6b
3 changed files with 409 additions and 49 deletions
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dma_gpio/Cargo.lock generated
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name = "tracing-core"
version = "0.1.34"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b9d12581f227e93f094d3af2ae690a574abb8a2b9b7a96e7cfe9647b2b617678"
dependencies = [
"once_cell",
"valuable",
]
[[package]]
name = "tracing-log"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ee855f1f400bd0e5c02d150ae5de3840039a3f54b025156404e34c23c03f47c3"
dependencies = [
"log",
"once_cell",
"tracing-core",
]
[[package]]
name = "tracing-subscriber"
version = "0.3.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2054a14f5307d601f88daf0553e1cbf472acc4f2c51afab632431cdcd72124d5"
dependencies = [
"matchers",
"nu-ansi-term",
"once_cell",
"regex-automata",
"sharded-slab",
"smallvec",
"thread_local",
"tracing",
"tracing-core",
"tracing-log",
]
[[package]] [[package]]
name = "unicode-ident" name = "unicode-ident"
version = "1.0.19" version = "1.0.19"
@@ -1028,6 +1232,12 @@ dependencies = [
"usbd-hid-descriptors", "usbd-hid-descriptors",
] ]
[[package]]
name = "valuable"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ba73ea9cf16a25df0c8caa16c51acb937d5712a8429db78a3ee29d5dcacd3a65"
[[package]] [[package]]
name = "vcell" name = "vcell"
version = "0.1.3" version = "0.1.3"
@@ -1055,6 +1265,132 @@ dependencies = [
"vcell", "vcell",
] ]
[[package]]
name = "windows"
version = "0.61.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9babd3a767a4c1aef6900409f85f5d53ce2544ccdfaa86dad48c91782c6d6893"
dependencies = [
"windows-collections",
"windows-core",
"windows-future",
"windows-link 0.1.3",
"windows-numerics",
]
[[package]]
name = "windows-collections"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3beeceb5e5cfd9eb1d76b381630e82c4241ccd0d27f1a39ed41b2760b255c5e8"
dependencies = [
"windows-core",
]
[[package]]
name = "windows-core"
version = "0.61.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c0fdd3ddb90610c7638aa2b3a3ab2904fb9e5cdbecc643ddb3647212781c4ae3"
dependencies = [
"windows-implement",
"windows-interface",
"windows-link 0.1.3",
"windows-result",
"windows-strings",
]
[[package]]
name = "windows-future"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fc6a41e98427b19fe4b73c550f060b59fa592d7d686537eebf9385621bfbad8e"
dependencies = [
"windows-core",
"windows-link 0.1.3",
"windows-threading",
]
[[package]]
name = "windows-implement"
version = "0.60.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.107",
]
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name = "windows-interface"
version = "0.59.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
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"quote",
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name = "windows-link"
version = "0.1.3"
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checksum = "5e6ad25900d524eaabdbbb96d20b4311e1e7ae1699af4fb28c17ae66c80d798a"
[[package]]
name = "windows-link"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "windows-numerics"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9150af68066c4c5c07ddc0ce30421554771e528bde427614c61038bc2c92c2b1"
dependencies = [
"windows-core",
"windows-link 0.1.3",
]
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "56f42bd332cc6c8eac5af113fc0c1fd6a8fd2aa08a0119358686e5160d0586c6"
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[[package]] [[package]]
name = "zerocopy" name = "zerocopy"
version = "0.8.27" version = "0.8.27"

13
dma_gpio/Cargo.toml
View File

@@ -10,12 +10,13 @@ cortex-m = { version = "0.7.7", features = ["inline-asm", "critical-section-sing
cortex-m-rt = "0.7.5" cortex-m-rt = "0.7.5"
panic-halt = "1.0.0" panic-halt = "1.0.0"
embassy-executor = { version = "0.9.1", features = ["arch-cortex-m", "executor-thread"] } embassy-executor = { git = "https://github.com/embassy-rs/embassy.git", branch = "main", features = ["arch-cortex-m", "executor-thread"] }
embassy-futures = "0.1.2" embassy-futures = { git = "https://github.com/embassy-rs/embassy.git", branch = "main" }
embassy-stm32 = { version = "0.4.0", features = ["unstable-pac", "stm32u575zi", "time-driver-any", "memory-x", "defmt"] } embassy-sync = { git = "https://github.com/embassy-rs/embassy.git", branch = "main" }
embassy-sync = "0.7.2" embassy-time = { git = "https://github.com/embassy-rs/embassy.git", branch = "main", features = ["tick-hz-32_768"] }
embassy-time = { version = "0.5.0", features = ["tick-hz-32_768"] } embassy-hal-internal = { git = "https://github.com/embassy-rs/embassy.git", branch = "main" }
embassy-usb = "0.5.1" embassy-usb = { git = "https://github.com/embassy-rs/embassy.git", branch = "main" }
embassy-stm32 = { git = "https://github.com/embassy-rs/embassy.git", branch = "main", features = ["unstable-pac", "stm32u575zi", "time-driver-any", "memory-x", "defmt"] }
embedded-hal = "1.0.0" embedded-hal = "1.0.0"
embedded-graphics = "0.8.1" embedded-graphics = "0.8.1"

39
dma_gpio/src/bin/main.rs
View File

@@ -11,7 +11,8 @@ use dma_gpio::dma_timer::init_tim6_for_uart;
use dma_gpio::dma_timer::init_tim7_for_uart; use dma_gpio::dma_timer::init_tim7_for_uart;
use embassy_stm32::gpio::Input; use embassy_stm32::gpio::Input;
use embassy_stm32::gpio::Pull; use embassy_stm32::gpio::Pull;
use dma_gpio::gpio_dma_uart_rx::GpioDmaRx; use dma_gpio::gpio_dma_uart_rx::TIM7_UP_REQ;
use embassy_stm32::dma::{ReadableRingBuffer as DmaRingRx, TransferOptions};
use {defmt_rtt as _, panic_probe as _}; use {defmt_rtt as _, panic_probe as _};
use embassy_stm32::{ use embassy_stm32::{
@@ -33,13 +34,14 @@ const BAUD: u32 = 115_200;
const TX_PIN_BIT: u8 = 2; // PA2 const TX_PIN_BIT: u8 = 2; // PA2
const TX_OVERSAMPLE: u16 = 1; const TX_OVERSAMPLE: u16 = 1;
const RX_OVERSAMPLE: u16 = 16; const RX_OVERSAMPLE: u16 = 16;
const RX_RING_BYTES: usize = 4096;
const UART_CFG: UartConfig = UartConfig { const UART_CFG: UartConfig = UartConfig {
data_bits: 8, data_bits: 8,
parity: Parity::None, parity: Parity::None,
stop_bits: StopBits::One, stop_bits: StopBits::One,
}; };
static mut RX_DMA_BUF: [u32; 512] = [0; 512]; static mut RX_RING: [u8; RX_RING_BYTES] = [0; RX_RING_BYTES];
fn dump_tim6_regs() { fn dump_tim6_regs() {
// PAC path for STM32U5: module `tim6`, type `Tim6` with ptr() // PAC path for STM32U5: module `tim6`, type `Tim6` with ptr()
@@ -100,8 +102,8 @@ async fn main(spawner: Spawner) {
dump_tim6_regs(); dump_tim6_regs();
// Start DMA consumer task // Start DMA consumer task
spawner.spawn(tx_dma_task(p.GPDMA1_CH0)).unwrap(); spawner.spawn(tx_dma_task(p.GPDMA1_CH0).unwrap());
spawner.spawn(rx_dma_task(p.GPDMA1_CH1)).unwrap(); spawner.spawn(rx_dma_task(p.GPDMA1_CH1).unwrap());
// Example: transmit a string as UART frames via the Pipe // Example: transmit a string as UART frames via the Pipe
loop { loop {
@@ -117,10 +119,31 @@ async fn main(spawner: Spawner) {
#[embassy_executor::task] #[embassy_executor::task]
async fn rx_dma_task(ch: Peri<'static, GPDMA1_CH1>) { async fn rx_dma_task(ch: Peri<'static, GPDMA1_CH1>) {
let buf_ptr = core::ptr::addr_of_mut!(RX_DMA_BUF);
let buf = unsafe { &mut *buf_ptr }; // SAFETY: this task owns the ring buffer exclusively (Rust 2024: avoid &mut static directly).
let mut rx = GpioDmaRx::new(ch, 3 /*PA3 bit*/, buf, &PIPE_RX); let ring_ptr = core::ptr::addr_of_mut!(RX_RING);
rx.run().await; let ring = unsafe { &mut *ring_ptr };
// Sample the low byte of GPIOA.IDR (PA0..PA7). PA3 is bit 3, so that's within this byte.
let idr_low_byte = embassy_stm32::pac::GPIOA.idr().as_ptr() as *mut u8;
let mut opts = TransferOptions::default();
// Enable HT/TC IRQ so read_exact can await naturally.
opts.half_transfer_ir = true;
opts.complete_transfer_ir = true;
// Start hardware-linked circular DMA into ring.
let mut rx = unsafe { DmaRingRx::new(ch, TIM7_UP_REQ, idr_low_byte, ring, opts) };
rx.start();
// Drain in fixed chunks when CPU has time; DMA keeps running regardless.
let mut chunk = [0u8; 256];
loop {
// Wait for a full chunk; wakes on half/full buffer events
let _ = rx.read_exact(&mut chunk).await;
// Forward raw samples to PIPE_RX (decode later if desired)
PIPE_RX.write(&chunk).await;
}
} }
#[embassy_executor::task] #[embassy_executor::task]