From 15da459de1b58826d7917368b496201c8115185e Mon Sep 17 00:00:00 2001
From: grammers <samkar-4@student.ltu.se>
Date: Thu, 1 Mar 2018 10:53:55 +0000
Subject: [PATCH] bare9 first trye
---
examples/.bare9.rs.swp | Bin 0 -> 12288 bytes
examples/bare9.rs | 106 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 106 insertions(+)
create mode 100644 examples/.bare9.rs.swp
diff --git a/examples/.bare9.rs.swp b/examples/.bare9.rs.swp
new file mode 100644
index 0000000000000000000000000000000000000000..5191816f29fc33c87c8c8252a4423d06e9ba3a46
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diff --git a/examples/bare9.rs b/examples/bare9.rs
index 90a4ad8..b4d1154 100644
--- a/examples/bare9.rs
+++ b/examples/bare9.rs
@@ -30,3 +30,109 @@
//
// https://play.rust-lang.org/,
// offers a good way to prototype and share code snippets
+//
+// //! Output a PWM on pin PA0 and control its duty cycle via a serial interface
+//!
+//! - '*' increase duty by a factor of 2
+//! - '+' increase duty by 1
+//! - '-' decrease duty by 1
+//! - '/' decrease duty by a factor of 2
+#![deny(unsafe_code)]
+//#![deny(warnings)]
+#![feature(proc_macro)]
+#![no_std]
+
+extern crate cortex_m_rtfm as rtfm;
+extern crate f4;
+#[macro_use]
+extern crate cortex_m_debug;
+
+use core::u32;
+
+use f4::prelude::*;
+use f4::time::Hertz;
+use f4::{Channel, Pwm, Serial};
+use f4::serial::Event;
+use rtfm::{app, Threshold};
+
+const BAUD_RATE: Hertz = Hertz(115_200);
+const FREQUENCY: Hertz = Hertz(1_000);
+
+app! {
+ device: f4::stm32f40x,
+
+ tasks: {
+ USART2: {
+ path: rx,
+ resources: [TIM4, USART2],
+ },
+ },
+}
+
+fn init(p: init::Peripherals) {
+ ipln!("init");
+ let pwm = Pwm(p.TIM4);
+ let serial = Serial(p.USART2);
+
+ serial.init(BAUD_RATE.invert(), None, p.GPIOA, p.RCC);
+ serial.listen(Event::Rxne);
+
+ pwm.init(
+ FREQUENCY.invert(),
+ Channel::_1,
+ None,
+ p.GPIOA,
+ p.GPIOB,
+ p.GPIOC,
+ p.RCC,
+ );
+ pwm.set_duty(Channel::_1, 1000);
+
+ pwm.enable(Channel::_1);
+}
+
+fn idle() -> ! {
+ ipln!("idle");
+ loop {
+ rtfm::wfi();
+ }
+}
+
+fn rx(_t: &mut Threshold, r: USART2::Resources) {
+ let pwm = Pwm(&**r.TIM4);
+ let serial = Serial(&**r.USART2);
+
+ //let byte: u8 = '+'.unwerp();
+ let byte = serial.read().unwrap();
+ // Echo back to signal we are alive
+ // serial.write(byte).unwrap();
+
+ ipln!("resewed {:?}", byte);
+
+ match byte {
+ b'+' | b'-' | b'*' | b'/' => {
+ let duty = pwm.get_duty(Channel::_1);
+
+ match byte {
+ b'+' => {
+ let max = pwm.get_max_duty();
+ pwm.set_duty(Channel::_1, if duty < max { duty + 1 } else { max });
+ }
+ b'-' => {
+ pwm.set_duty(Channel::_1, duty.checked_sub(1).unwrap_or(0));
+ }
+ b'*' => {
+ let new_duty = duty.checked_mul(2).unwrap_or(u32::MAX);
+ let max_duty = pwm.get_max_duty();
+
+ if new_duty < max_duty {
+ pwm.set_duty(Channel::_1, new_duty)
+ }
+ }
+ b'/' => pwm.set_duty(Channel::_1, duty / 2),
+ _ => ipln!("iner error"),//{ /* unreachable */ }
+ }
+ }
+ _ => ipln!("outher error"),//{}
+ }
+}
--
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