extern crate common;
+mod uart0;
+
use common::buffer::Buffer;
use common::clock;
use common::systick;
use common::gpio;
use common::nvic;
use common::i2c;
+use common::uart;
use common::usb_serial;
use common::display;
+use common::gps;
extern {
fn enable_interrupts();
static mut cdc_tx_buf: Buffer;
}
+struct Timer {
+ state: u32,
+ delay_ms: u32,
+ last_update_ticks: u32,
+}
+
+impl Timer {
+ pub fn new(delay_ms: u32) -> Timer {
+ Timer {
+ state: 0,
+ delay_ms: delay_ms,
+ last_update_ticks: systick::now(),
+ }
+ }
+
+ pub fn update<F>(&mut self, func: F)
+ where F: FnOnce(u32) -> u32
+ {
+ if systick::has_timeout_ms(self.last_update_ticks, self.delay_ms) {
+ self.state = func(self.state);
+
+ self.last_update_ticks = systick::now();
+ }
+ }
+}
+
#[no_mangle]
pub unsafe extern "C" fn _start() -> ! {
clock::configure();
+ clock::enable_osc0();
systick::init();
port::init();
gpio::set_direction(gpio::GPIOB, 1 << 16, gpio::Direction::Output);
port::set_af(port::PORTB, 16, 1);
+ // Configure pins for UART0.
+ port::set_af(port::PORTE, 20, 4);
+ port::set_af(port::PORTE, 21, 4);
+
+ // Configure pin for the GPS's reset line.
+ gpio::set_direction(gpio::GPIOB, 1 << 1, gpio::Direction::Output);
+ port::set_af(port::PORTB, 1, 1);
+
// Configure upper right push button.
gpio::set_direction(gpio::GPIOA, 1 << 12, gpio::Direction::Input);
port::set_af(port::PORTA, 12, 1);
display.init();
display.clear();
+ // Hold GPS in reset while configuring its UART.
+ gpio::clear(gpio::GPIOB, 1);
+ systick::delay_ms(50);
+ uart::configure(uart::UART0);
+ systick::delay_ms(50);
+ gpio::set(gpio::GPIOB, 1);
+
+ nvic::enable_irq(12); // UART0
+
+ let mut gps = gps::Gps::new();
+
+ let mut gps_has_fix = false;
+ let mut gps_has_fix_ticks = 0;
+
+ let mut heart_icon_timer = Timer::new(1000);
+ let mut gps_icon_timer = Timer::new(500);
+
loop {
- systick::delay_ms(1000);
+ let mut tap = gps::TimeAndPos::new();
+ let old_gps_has_fix = gps_has_fix;
+
+ while gps.update(&mut tap) {
+ gps_has_fix = true;
+ gps_has_fix_ticks = systick::now();
+ }
+
+ // Did GPS fix information expire?
+ if gps_has_fix && systick::has_timeout_ms(gps_has_fix_ticks, 1500) {
+ gps_has_fix = false;
+ }
+
+ if gps_has_fix && !old_gps_has_fix {
+ display.show_icon(display::Icon::SatelliteBody);
+ display.show_icon(display::Icon::SatelliteWave1);
+ display.show_icon(display::Icon::SatelliteWave2);
+ } else if !gps_has_fix {
+ gps_icon_timer.update(|state| {
+ if state == 1 {
+ display.show_icon(display::Icon::SatelliteWave1);
+ 2
+ } else if state == 2 {
+ display.show_icon(display::Icon::SatelliteWave2);
+ 3
+ } else if state == 3 {
+ display.hide_icon(display::Icon::SatelliteBody);
+ display.hide_icon(display::Icon::SatelliteWave1);
+ display.hide_icon(display::Icon::SatelliteWave2);
+ 0
+ } else {
+ display.show_icon(display::Icon::SatelliteBody);
+ 1
+ }
+ });
+ }
- cdc_tx_buf.write(b".\n");
- cdc_tx_buf.flush();
+ heart_icon_timer.update(|state| {
+ if state == 1 {
+ display.hide_icon(display::Icon::Heart);
+ 0
+ } else {
+ display.show_icon(display::Icon::Heart);
+ 1
+ }
+ });
if (gpio::get(gpio::GPIOA) & (1 << 12)) == 0 {
nvic::system_reset();