1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
#![no_std]
#![no_main]
use defmt::{panic, *};
use embassy_executor::Spawner;
use embassy_futures::join::join;
use embassy_stm32::usb::{Driver, Instance};
use embassy_stm32::{bind_interrupts, peripherals, usb, Config};
use embassy_usb::class::cdc_acm::{CdcAcmClass, State};
use embassy_usb::driver::EndpointError;
use embassy_usb::Builder;
use {defmt_rtt as _, panic_probe as _};
bind_interrupts!(struct Irqs {
USB_OTG_HS => usb::InterruptHandler<peripherals::USB_OTG_HS>;
});
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
info!("Hello World!");
let mut config = Config::default();
{
use embassy_stm32::rcc::*;
config.rcc.pll1 = Some(Pll {
source: PllSource::HSI,
prediv: PllPreDiv::DIV1, // PLLM = 1 → HSI / 1 = 16 MHz
mul: PllMul::MUL30, // PLLN = 30 → 16 MHz * 30 = 480 MHz VCO
divr: Some(PllDiv::DIV5), // PLLR = 5 → 96 MHz (Sysclk)
divq: Some(PllDiv::DIV10), // PLLQ = 10 → 48 MHz
divp: Some(PllDiv::DIV30), // PLLP = 30 → 16 MHz (USB_OTG_HS)
frac: Some(0), // Fractional part (disabled)
});
config.rcc.ahb_pre = AHBPrescaler::DIV1;
config.rcc.apb1_pre = APBPrescaler::DIV1;
config.rcc.apb2_pre = APBPrescaler::DIV1;
config.rcc.apb7_pre = APBPrescaler::DIV1;
config.rcc.ahb5_pre = AHB5Prescaler::DIV4;
config.rcc.voltage_scale = VoltageScale::RANGE1;
config.rcc.mux.otghssel = mux::Otghssel::PLL1_P;
config.rcc.sys = Sysclk::PLL1_R;
}
let p = embassy_stm32::init(config);
// Create the driver, from the HAL.
let mut ep_out_buffer = [0u8; 256];
let mut config = embassy_stm32::usb::Config::default();
// Do not enable vbus_detection. This is a safe default that works in all boards.
// However, if your USB device is self-powered (can stay powered on if USB is unplugged), you need
// to enable vbus_detection to comply with the USB spec. If you enable it, the board
// has to support it or USB won't work at all. See docs on `vbus_detection` for details.
config.vbus_detection = false;
let driver = Driver::new_hs(p.USB_OTG_HS, Irqs, p.PD6, p.PD7, &mut ep_out_buffer, config);
// Create embassy-usb Config
let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
config.manufacturer = Some("Embassy");
config.product = Some("USB-serial example");
config.serial_number = Some("12345678");
// Create embassy-usb DeviceBuilder using the driver and config.
// It needs some buffers for building the descriptors.
let mut config_descriptor = [0; 256];
let mut bos_descriptor = [0; 256];
let mut control_buf = [0; 64];
let mut state = State::new();
let mut builder = Builder::new(
driver,
config,
&mut config_descriptor,
&mut bos_descriptor,
&mut [], // no msos descriptors
&mut control_buf,
);
// Create classes on the builder.
let mut class = CdcAcmClass::new(&mut builder, &mut state, 64);
// Build the builder.
let mut usb = builder.build();
// Run the USB device.
let usb_fut = usb.run();
// Do stuff with the class!
let echo_fut = async {
loop {
class.wait_connection().await;
info!("Connected");
let _ = echo(&mut class).await;
info!("Disconnected");
}
};
// Run everything concurrently.
// If we had made everything `'static` above instead, we could do this using separate tasks instead.
join(usb_fut, echo_fut).await;
}
struct Disconnected {}
impl From<EndpointError> for Disconnected {
fn from(val: EndpointError) -> Self {
match val {
EndpointError::BufferOverflow => panic!("Buffer overflow"),
EndpointError::Disabled => Disconnected {},
}
}
}
async fn echo<'d, T: Instance + 'd>(class: &mut CdcAcmClass<'d, Driver<'d, T>>) -> Result<(), Disconnected> {
let mut buf = [0; 64];
loop {
let n = class.read_packet(&mut buf).await?;
let data = &buf[..n];
info!("data: {:x}", data);
class.write_packet(data).await?;
}
}
|
