144 lines
4.2 KiB
Rust
144 lines
4.2 KiB
Rust
#![no_std]
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#![no_main]
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use core::ptr;
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use panic_halt as _; // you can put a breakpoint on `rust_begin_unwind` to catch panics
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use cortex_m_rt::entry;
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use test_cortex_m4_rust::{Function, Bit, ReadablePinSetup, WritablePinSetup, PortSetup, Port, setup_board, H, L};
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// use test_cortex_m4_rust::setup_board;
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// Begin .h file contents
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// GPIO registers (PORTF)
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const GPIO_PORTF_DATA_R: *mut u32 = 0x400253FC as *mut u32;
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const GPIO_PORTF_DIR_R: *mut u32 = 0x40025400 as *mut u32;
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const GPIO_PORTF_AFSEL_R: *mut u32 = 0x40025420 as *mut u32;
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const GPIO_PORTF_PUR_R: *mut u32 = 0x40025510 as *mut u32;
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const GPIO_PORTF_DEN_R: *mut u32 = 0x4002551C as *mut u32;
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const GPIOLOCK_PORT_F: *mut u32 = 0x40025520 as *mut u32;
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const GPIOCR_PORT_F: *mut u32 = 0x40025524 as *mut u32;
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const GPIOAMSEL_PORT_F: *mut u32 = 0x40025528 as *mut u32;
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const GPIO_PORTF_PCTL_R: *mut u32 = 0x4002552C as *mut u32;
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const SYSCTL_RCGCPIO_R: *mut u32 = 0x400FE608 as *mut u32;
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// Begin starter project contents
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const GPIO_LOCK_KEY: *mut u32 = 0x4C4F434B as *mut u32;
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const PF0: *mut u32 = 0x40025004 as *mut u32;
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const PF4: *mut u32 = 0x40025040 as *mut u32;
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const SWITCHES: *mut u32 = 0x40025044 as *mut u32;
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const SW1: u8 = 0b0001_0000;
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const SW2: u8 = 0b0000_0001;
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const SYSCTL_RCGC2_GPIOF: *mut u32 = 0x00000020 as *mut u32;
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const BLACK: u8 = 0b0000_0000;
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const RED: u8 = 0b0000_0010;
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const GREEN: u8 = 0b0000_1000;
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const BLUE: u8 = 0b0000_0100;
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fn setup_port_f() {
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// 1) activate clock for Port F
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// unsafe {
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// ptr::write_volatile(
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// SYSCTL_RCGCPIO_R,
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// ptr::read_volatile(SYSCTL_RCGCPIO_R) | 0x00_00_00_20,
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// );
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// }
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// Delay
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// for _ in 0u8..2u8 {}
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// 2) unlock GPIO Port F
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// unsafe {
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// ptr::write_volatile(GPIOLOCK_PORT_F, 0x4C4F434B);
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// // allow changes to PF4-0
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// // only PF0 needs to be unlocked, other bits can't be locked
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// ptr::write_volatile(GPIOCR_PORT_F, 0b0001_1111);
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// }
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// 3) disable analog on PF
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// unsafe { ptr::write_volatile(GPIOAMSEL_PORT_F, 0x00) }
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// 4) PCTL GPIO on PF4-0
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// unsafe {
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// ptr::write_volatile(GPIO_PORTF_PCTL_R, 0x00000000);
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// }
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// 5) PF4,PF0 in, PF3-1 out
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// unsafe {
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// ptr::write_volatile(GPIO_PORTF_DIR_R, 0x0E);
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// }
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// 6) disable alt funct on PF7-0
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// unsafe {
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// ptr::write_volatile(GPIO_PORTF_AFSEL_R, 0x00);
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// }
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// enable pull-up on PF0 and PF4
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// unsafe {
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// ptr::write_volatile(GPIO_PORTF_PUR_R, 0x11);
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// }
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// 7) enable digital I/O on PF4-0
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// unsafe {
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// ptr::write_volatile(GPIO_PORTF_DEN_R, 0x1F);
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// }
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}
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// fn input_from_port_f() -> u32 {
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// unsafe {
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// ptr::read_volatile(GPIO_PORTF_DATA_R) & u32::from(SW1 | SW2)
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// }
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// }
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// fn output_to_port_f(value: u8) {
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// unsafe {
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// ptr::write_volatile(GPIO_PORTF_DATA_R, u32::from(value));
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// }
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// }
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#[entry]
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fn main() -> ! {
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let board = setup_board();
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let port_f = board.setup_gpio_port(Port::F, PortSetup);
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let switches = port_f.setup_readable_pins(&[Bit::Zero, Bit::Four], ReadablePinSetup {
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function: Function::Digital,
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pull_up: Some(true),
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});
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let [sw1, sw2] = switches.pins();
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let mut rgb_led = port_f.setup_writable_pins(&[Bit::One, Bit::Three, Bit::Two], WritablePinSetup { function: Function::Digital });
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loop {
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match switches.read_all() {
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[L, L] => rgb_led.write_all([L, H, L]),
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[L, H] => rgb_led.write_all([L, L, H]),
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[H, L] => rgb_led.write_all([L, H, L]),
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[H, H] => rgb_led.write_all([H, L, L]),
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}
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}
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}
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// #[entry]
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// fn main() -> ! {
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// setup_port_f();
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// loop {
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// let status = input_from_port_f();
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// match status {
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// 0x00 => output_to_port_f(RED | GREEN),
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// 0x01 => output_to_port_f(RED),
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// 0x10 => output_to_port_f(GREEN),
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// 0x11 => output_to_port_f(BLACK),
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// // Impossible case
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// _ => output_to_port_f(BLUE),
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// }
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// }
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// }
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// TODO: implement an extremely simple example of the task system (using a timer trigger) that is a traffic light (green -> yellow -> red -> green...)
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