99bf346898
* Clean up passing clocks to drivers * Update changelog * Initialise Clocks in a critical section * Fix calling now() before init * Fix doc * Fix esp-wifi migration guide * Add safety comment * Update tests
72 lines
1.8 KiB
Rust
72 lines
1.8 KiB
Rust
//! CDC-ACM serial port example using polling in a busy loop.
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//!
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//! This example should be built in release mode.
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//!
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//! The following wiring is assumed:
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//! - DP => GPIO20
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//! - DM => GPIO19
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//% CHIPS: esp32s2 esp32s3
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#![no_std]
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#![no_main]
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use core::ptr::addr_of_mut;
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use esp_backtrace as _;
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use esp_hal::{
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gpio::Io,
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otg_fs::{Usb, UsbBus},
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prelude::*,
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};
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use usb_device::prelude::{UsbDeviceBuilder, UsbVidPid};
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use usbd_serial::{SerialPort, USB_CLASS_CDC};
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static mut EP_MEMORY: [u32; 1024] = [0; 1024];
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#[entry]
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fn main() -> ! {
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let peripherals = esp_hal::init(esp_hal::Config::default());
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let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);
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let usb = Usb::new(peripherals.USB0, io.pins.gpio20, io.pins.gpio19);
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let usb_bus = UsbBus::new(usb, unsafe { &mut *addr_of_mut!(EP_MEMORY) });
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let mut serial = SerialPort::new(&usb_bus);
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let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x303A, 0x3001))
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.device_class(USB_CLASS_CDC)
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.build();
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loop {
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if !usb_dev.poll(&mut [&mut serial]) {
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continue;
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}
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let mut buf = [0u8; 64];
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match serial.read(&mut buf) {
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Ok(count) if count > 0 => {
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// Echo back in upper case
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for c in buf[0..count].iter_mut() {
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if 0x61 <= *c && *c <= 0x7a {
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*c &= !0x20;
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}
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}
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let mut write_offset = 0;
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while write_offset < count {
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match serial.write(&buf[write_offset..count]) {
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Ok(len) if len > 0 => {
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write_offset += len;
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}
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_ => {}
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}
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}
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}
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_ => {}
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}
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}
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}
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