#![no_main]
#![no_std]

///
/// Compare also with: https://github.com/Ko-/aes-armcortexm
///
extern crate panic_halt;
use cortex_m::asm;
use cortex_m_rt::entry;
use cortex_m_semihosting::{dbg, hprintln};

#[allow(unused_imports)]
use hal::prelude::*;
#[allow(unused_imports)]
use lpc55_hal as hal;

use core::ptr;

#[entry]
fn main() -> ! {
    let p_portmode = (0x400A_2000 + 0x5C) as *mut u32;

    let dp = hal::raw::Peripherals::take().unwrap();
    let mut pmc = hal::pmc::wrap(dp.PMC);
    let mut syscon = hal::syscon::wrap(dp.SYSCON);
    let mut iocon = hal::iocon::wrap(dp.IOCON).enable(&mut syscon);

    // configure pins
    hprintln!("{:x}", iocon.get_pio_0_22_config()).unwrap();
    iocon.configure_pio_0_22_as_usb0_vbus();
    hprintln!("{:x}", iocon.get_pio_0_22_config()).unwrap();

    // setup FRO clocking
    let mut anactrl = hal::anactrl::wrap(dp.ANACTRL);
    syscon.fro_12m_as_main_clk(); // switch to FRO 12MHzso we can change the clock setting
    anactrl.enable_96mhzclk();
    // the mysterious libpower
    unsafe { hal::POWER_SetVoltageForFreq(96_000_000) };
    syscon.set_num_wait_states(8);
    syscon.set_ahbclkdiv(1);
    syscon.fro_hf_as_main_clk();

    dbg!("phew");

    let usbfsd = hal::usbfs::wrap(dp.USB0).enabled(&mut pmc, &mut syscon);
    syscon.fro_hf_as_usbfs_clk();

    // Port mode configuration: Enable port mode configuration by setting the
    // USB0_HOSTS in the AHBCLKCTRL2 register. See Table 56. Set DEV_ENABLE in
    // Section 42.7.23 “PortMode register” in Port Mode register (offset 0x5C) to enable the
    // device controller on the USB0 port. Once configured, to save power, clear
    // USB0_HOSTS in the AHBCLKCTRL2 register, See Section 4.5.19 “AHB clock control 2”.

    let usbfsh = hal::usbfsh::wrap(dp.USBFSH);

    let portmode = unsafe { ptr::read(p_portmode) };
    dbg!(portmode);

    let mut usbfsh = usbfsh.enabled(&mut pmc, &mut syscon);//.disabled(&mut pmc, &mut syscon);

    // current hypothesis: need to call `POWER_SetVoltageForFreq(96000000U)`
    // from their `fsl_power_lib.c`, which they only make available via
    // various `libpower_*.a` files.
    //
    // https://community.nxp.com/thread/465009
    //enable());

    dbg!("risque");
    dbg!(syscon.is_enabled_usb0_hosts());
    syscon.enable_usb0_hosts();
    dbg!(syscon.is_enabled_usb0_hosts());

    dbg!("pmc.pdruncfg0.usb_phy");
    dbg!(unsafe { ptr::read((0x4002_0000 + 0xb8) as *const u32) & (1u32 << 11) != 0} );
    dbg!(usbfsd.is_powered(&pmc));

    dbg!(unsafe { &(*hal::raw::PMC::ptr()).pdruncfg0.modify(|_, w| w.pden_usbfsphy().poweredon()) } );
    dbg!("pmc.pdruncfg0.usb_phy");
    dbg!(unsafe { ptr::read((0x4002_0000 + 0xb8) as *const u32) & (1u32 << 11) != 0} );
    dbg!(usbfsd.is_powered(&pmc));

    dbg!("syscon.ahbclkctrl2.usb0_hosts");
    dbg!(unsafe { ptr::read((0x4000_0000 + 0x208) as *const u32) & (1u32 << 17) != 0} );

    // dbg!(usbfsh.is_device_enabled());
    // dbg!(usbfsh.enable_device());
    dbg!(unsafe { ptr::read((0x400A_2000 + 0x5C) as *const u32) & (1u32 << 16) } );
    dbg!("oh ok");

    // let portmode = unsafe { ptr::read(p) };
    // dbg!(portmode);

    // dbg!("this crashes everything. TODO: fix!");
    // USB0:   0x4008_4000
    // USBFSH: 0x400a_2000


    // latch clock to USBFSD SOF packets
    // TODO: does this mess up when nothing's attached?
    // doesn't seem so...
    // let mut anactrl = hal::anactrl::wrap(dp.ANACTRL);
    // // dbg!(anactrl.is_12mhzclk_enabled());
    // // dbg!(anactrl.is_48mhzclk_enabled());
    // // dbg!(anactrl.is_96mhzclk_enabled());
    // anactrl.latch_fro_hf_to_usbfs();

    // UM says: (5, 1)  <-- probly swapped
    // We get: (1, 6)
    // dbg!(usbfs.info());

    dbg!("off to wfi land");
    loop {
        asm::wfi();
    }
}