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|
#![no_std]
#![no_main]
//extern crate panic_semihosting;
mod cirque;
mod led;
mod log;
use cirque::Cirque;
use led::LED;
use cortex_m::{
asm::{bkpt, wfi},
interrupt,
};
use cortex_m_rt::entry;
use embedded_hal::spi;
use stm32f1xx_hal::{
pac,
prelude::*,
serial::{Config, Serial, StopBits, WordLength},
spi::Spi,
usb::{self, UsbBus},
};
use usb_device::prelude::*;
use usbd_serial::{SerialPort, USB_CLASS_CDC};
#[entry]
fn main() -> ! {
let dp = pac::Peripherals::take().unwrap();
let mut flash = dp.FLASH.constrain();
let rcc = dp.RCC.constrain();
let clocks = rcc
.cfgr
.use_hse(8.MHz())
.sysclk(72.MHz()) // TODO: gd32 can get up to 120MHz
// .pclk1(24.MHz()) // TODO: causes issues with gd32 usb (dropped packets) and garbled usart1 output
.freeze(&mut flash.acr);
assert!(clocks.usbclk_valid());
let mut gpiob = dp.GPIOB.split();
let mut led = LED::new(gpiob.pb2, &mut gpiob.crl);
let mut afio = dp.AFIO.constrain();
let mut gpioa = dp.GPIOA.split();
let tx_pin = gpioa.pa9.into_alternate_push_pull(&mut gpioa.crh);
let rx_pin = gpioa.pa10;
let serial = Serial::usart1(
dp.USART1,
(tx_pin, rx_pin),
&mut afio.mapr,
Config::default()
.baudrate(115200.bps())
.wordlength(WordLength::Bits8)
.parity_none()
.stopbits(StopBits::STOP1),
clocks,
);
let (tx, _) = serial.split();
log::init(tx);
logln!("luchie started!");
// cirque spi connections to spi1:
//
// pb0 - dr
// pa4 - ss1
// pa5 - clk1
// pa6 - miso1
// pa7 - mosi1
let dr_pin = gpiob.pb0;
let sck_pin = gpioa.pa5.into_alternate_push_pull(&mut gpioa.crl);
let miso_pin = gpioa.pa6;
let mosi_pin = gpioa.pa7.into_alternate_push_pull(&mut gpioa.crl);
let cs_pin = gpioa.pa4.into_push_pull_output(&mut gpioa.crl);
let mut spi = Spi::spi1(
dp.SPI1,
(sck_pin, miso_pin, mosi_pin),
&mut afio.mapr,
spi::MODE_1,
1.MHz(),
clocks,
);
let mut cirque = Cirque::new(cs_pin, dr_pin, &mut spi, clocks).expect("couldn't init touch pad");
// BluePill board has a pull-up resistor on the D+ line.
// Pull the D+ pin down to send a RESET condition to the USB bus.
// This forced reset is needed only for development, without it host
// will not reset your device when you upload new firmware.
let mut usb_dp = gpioa.pa12.into_push_pull_output(&mut gpioa.crh);
usb_dp.set_low();
// let mut delay = dp.TIM2.delay_us(&clocks);
// delay.delay_ms(10u8);
cortex_m::asm::delay(clocks.sysclk().raw() / 100);
let usb = usb::Peripheral {
usb: dp.USB,
pin_dm: gpioa.pa11,
pin_dp: usb_dp.into_floating_input(&mut gpioa.crh),
};
let usb_bus = UsbBus::new(usb);
let mut serial = SerialPort::new(&usb_bus);
let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0xdead, 0xbeef))
.manufacturer("Fake company")
.product("Serial port")
.serial_number("TEST")
.device_class(USB_CLASS_CDC)
.build();
loop {
logln!(".");
if let Ok(mut td) = cirque.poll(&mut spi) {
td.scale_to(1920, 1080);
logln!("td: {:?}", td);
}
if !usb_dev.poll(&mut [&mut serial]) {
continue;
}
let mut buf = [0u8; 64];
match serial.read(&mut buf) {
Ok(count) if count > 0 => {
led.on();
// Echo back in upper case
for c in buf[0..count].iter_mut() {
if 0x61 <= *c && *c <= 0x7a {
*c &= !0x20;
}
}
let mut write_offset = 0;
while write_offset < count {
match serial.write(&buf[write_offset..count]) {
Ok(len) if len > 0 => {
write_offset += len;
}
_ => {}
}
}
}
_ => {}
}
led.off();
}
}
#[panic_handler]
fn panic(info: &core::panic::PanicInfo) -> ! {
interrupt::free(|_cs| {
log!("!!! panic ");
if let Some(loc) = info.location() {
log!("in {}:{} ", loc.file(), loc.line());
}
if let Some(msg) = info.payload().downcast_ref::<&str>() {
log!("⇒ {} ", msg);
}
logln!("!!!");
});
spin();
}
fn spin() -> ! {
bkpt();
loop {
wfi();
}
}
|
