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|
//! CW output using PWM on PA8, TIM1 CH1
use stm32f1xx_hal::{
timer,
pac::TIM1,
};
const CW_MAPPING : [u8; 50] = [ //{{{
// Read bits from right to left
0b110101, //+ ASCII 43
0b110101, //, ASCII 44
0b1011110, //- ASCII 45
0b1010101, //., ASCII 46
0b110110, // / ASCII 47
0b100000, // 0, ASCII 48
0b100001, // 1
0b100011,
0b100111,
0b101111,
0b111111,
0b111110,
0b111100,
0b111000,
0b110000, // 9, ASCII 57
// The following are mostly invalid, but
// required to fill the gap in ASCII between
// numerals and capital letters
0b10, // :
0b10, // ;
0b10, // <
0b101110, // =
0b10, // >
0b1110011, // ?
0b1101001, //@
0b101, // A ASCII 65
0b11110,
0b11010,
0b1110,
0b11,
0b11011,
0b1100,
0b11111,
0b111,
0b10001,
0b1010,
0b11101,
0b100, //M
0b110,
0b1000,
0b11001,
0b10100,
0b1101,
0b1111,
0b10,
0b1011,
0b10111,
0b1001,
0b10110,
0b10010,
0b11100, // Z
0b101010, //Start, ASCII [
0b1010111, // SK , ASCII '\'
]; //}}}
const CW_MACRO : &[u8; 28] = b"CQ DE HB9EGM HB9EGM HB9EGM K";
pub const SIDETONE_FREQ : u32 = 800;
pub struct CWPWM {
channel : timer::pwm::PwmChannel<TIM1, { timer::pwm::C1 }>,
}
impl CWPWM {
pub fn new(mut channel: timer::pwm::PwmChannel<TIM1, { timer::pwm::C1 }>) -> Self {
channel.enable();
channel.set_duty(0);
CWPWM { channel }
}
pub fn on(&mut self) {
let max = self.channel.get_max_duty();
self.channel.set_duty(max / 2);
}
pub fn off(&mut self) {
self.channel.set_duty(0);
}
}
#[derive(PartialEq, Eq, Clone, Copy)]
enum MorseSign {
Dot,
Dash
}
impl MorseSign {
fn length(&self) -> u32 {
match self {
Self::Dot => 1,
Self::Dash => 3,
}
}
fn other(&self) -> Self {
match self {
Self::Dot => Self::Dash,
Self::Dash => Self::Dot,
}
}
}
fn other_pressed(sign: MorseSign, dot_pressed: bool, dash_pressed: bool) -> bool {
match sign {
MorseSign::Dot => dash_pressed,
MorseSign::Dash => dot_pressed,
}
}
#[derive(Eq, Clone, Copy)]
enum KeyerState {
Idle,
Beep{current: MorseSign, next: Option<MorseSign>},
Pause{current: MorseSign, next: Option<MorseSign>},
LastPause{next: Option<MorseSign>},
}
impl PartialEq for KeyerState {
fn eq(&self, rhs: &Self) -> bool {
match (self, rhs) {
(Self::Idle, Self::Idle) => true,
(Self::Beep{current : c1, next : _}, Self::Beep{current : c2, next : _}) => c1 == c2,
(Self::Pause{current : c1, next : _}, Self::Pause{current : c2, next : _}) => c1 == c2,
(Self::LastPause{next : _}, Self::LastPause{next : _}) => true,
_ => false,
}
}
}
pub struct Keyer {
// All durations are in ticks
dot_length : u32,
state : KeyerState,
time_last_state_change : u32,
}
impl Keyer {
pub fn new(wpm : u32, ticks_per_s: u32) -> Keyer {
/* PARIS standard: 20 words per minute = dot length of 60 ms, inversely proportional:
* 1 wpm = 1200 ms, 2 wpm = 600 ms */
Keyer{
dot_length : 1200 * ticks_per_s / (1000 * wpm),
state : KeyerState::Idle,
time_last_state_change : 0,
}
}
pub fn set_speed(&mut self, wpm : u32, ticks_per_s: u32) { self.dot_length = 1200 * ticks_per_s / (1000 * wpm) }
pub fn tick(&mut self, ticks_now: u32, dot_pressed: bool, dash_pressed: bool) -> bool {
let mut transmit = false;
let next_state = match self.state {
KeyerState::Idle => {
if dot_pressed {
transmit = true;
KeyerState::Beep{current: MorseSign::Dot, next: None}
}
else if dash_pressed {
transmit = true;
KeyerState::Beep{current: MorseSign::Dash, next: None}
}
else {
KeyerState::Idle
}
},
KeyerState::Beep{current, next} => {
transmit = true;
let next = if other_pressed(current, dot_pressed, dash_pressed) {
Some(current.other())
}
else {
next
};
if self.time_last_state_change + self.dot_length * current.length() <= ticks_now {
KeyerState::Pause{current, next}
}
else {
KeyerState::Beep{current, next}
}
},
KeyerState::Pause{current, next} => {
let next = if other_pressed(current, dot_pressed, dash_pressed) {
Some(current.other())
}
else {
next
};
if self.time_last_state_change + self.dot_length <= ticks_now {
match next {
Some(state) => {
transmit = true;
KeyerState::Beep{current: state, next: None}
},
None => KeyerState::LastPause{next: None}
}
}
else {
KeyerState::Pause{current, next}
}
},
KeyerState::LastPause{next} => {
let next = if dot_pressed {
Some(MorseSign::Dot)
}
else if dash_pressed {
Some(MorseSign::Dash)
}
else {
next
};
if self.time_last_state_change + self.dot_length <= ticks_now {
KeyerState::LastPause{next}
}
else {
match next {
Some(MorseSign::Dot) => {
transmit = true;
KeyerState::Beep{current: MorseSign::Dot, next: None}
},
Some(MorseSign::Dash) => {
transmit = true;
KeyerState::Beep{current: MorseSign::Dash, next: None}
},
None => {
KeyerState::Idle
},
}
}
},
};
if next_state != self.state {
self.time_last_state_change = ticks_now;
}
self.state = next_state;
transmit
}
}
|
