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extern crate cortex_m;
extern crate heapless;
extern crate rtfm;
use crate::ingress::buffer::{Buffer, Type};
use heapless::consts::*;
use heapless::spsc::Queue;
use simple_hex::hex_byte_to_byte;
use crate::system::system::System;
pub const BUFF_SIZE: usize = 256;
pub const BUFF_COUNT: usize = 8;
#[derive(Copy, Clone, PartialEq, Debug)]
enum State {
Wait, /* Waiting for data */
Init,
Payload,
ApplicationChecksum,
ApplicationStore,
}
const STX: u8 = 2;
const ETX: u8 = 3;
const PAYLOAD: u8 = 31; // Unit Separator
pub struct IngressManager {
buffer: Buffer,
rb: &'static mut Queue<u8, U512>,
state: State,
hex_chars: [u8; 2],
hex_idx: usize,
}
impl IngressManager {
pub fn new(ring: &'static mut Queue<u8, U512>) -> Self {
IngressManager {
buffer: Buffer::default(),
rb: ring,
state: State::Init,
hex_chars: [0u8; 2],
hex_idx: 0,
}
}
pub fn write(&mut self, data: &[u8]) {
for byte in data {
match self.rb.enqueue(*byte) {
Ok(_) => {},
Err(e) => panic!("Ring buffer overflow by {:?} bytes", e)
}
}
}
pub fn process(
&mut self,
system: &mut System
) {
if !self.rb.is_empty() {
while let Some(byte) = self.rb.dequeue() {
match byte {
STX => {
if self.state != State::Wait {
warn!("Partial buffer detected: {:?}", self.buffer);
}
/* Start of packet */
self.hex_idx = 0;
self.buffer.clear();
self.state = State::Init; // activate processing
}
ETX => {
/* End of packet */
/* Finalize messge then reset state machine ready for next msg*/
self.state = State::Wait;
match self.buffer.btype {
Type::Unknown => self.state = State::Wait, // if the type cannot be determined abort, and wait until next STX
Type::Application => {
match system.am().verify() {
Ok(_) =>
{
}
Err(e) => panic!("{:?} || AMNG: {:?}", e, system.am().status()),
}
}
Type::Notification => {
info!("Adding notification from: {:?}", self.buffer);
system.nm().add(&self.buffer).unwrap();
}
_ => panic!("Unhandled buffer in {:?}", self.state),
}
}
PAYLOAD => {
match self.buffer.btype {
Type::Unknown => {
warn!("Dropping buffer of unknown type {:?}", self.buffer.btype);
self.state = State::Wait
}
Type::Application => {
if self.state == State::ApplicationChecksum {
// We've parsed the checksum, now we write the data into ram
self.state = State::ApplicationStore
} else {
// reset before we load the new application
system.am().stop().unwrap();
// parse the checksum
self.state = State::ApplicationChecksum;
}
}
_ => self.state = State::Payload,
}
}
_ => {
/* Run through byte state machine */
match self.state {
State::Init => {
self.buffer.btype = self.determine_type(byte);
match self.buffer.btype {
Type::Unknown => self.state = State::Wait,
_ => {} // carry on
}
}
State::Payload => {
self.buffer.write(byte);
}
State::ApplicationChecksum => {
self.hex_chars[self.hex_idx] = byte;
self.hex_idx += 1;
if self.hex_idx > 1 {
system.am().write_checksum_byte(
hex_byte_to_byte(self.hex_chars[0], self.hex_chars[1]).unwrap(),
)
.unwrap();
self.hex_idx = 0;
}
}
State::ApplicationStore => {
self.hex_chars[self.hex_idx] = byte;
self.hex_idx += 1;
if self.hex_idx > 1 {
system.am().write_ram_byte(
hex_byte_to_byte(self.hex_chars[0], self.hex_chars[1]).unwrap(),
)
.unwrap();
self.hex_idx = 0;
}
}
State::Wait => {
// do nothing, useless bytes
}
}
}
}
}
}
}
fn determine_type(&mut self, type_byte: u8) -> Type {
self.buffer.btype = match type_byte {
b'N' => Type::Notification, /* NOTIFICATION i.e FB Msg */
b'W' => Type::Weather, /* Weather packet */
b'D' => Type::Date, /* Date packet */
b'M' => Type::Music, /* Spotify controls */
b'A' => Type::Application, /* Load Application */
_ => Type::Unknown,
};
self.buffer.btype
}
pub fn print_rb(&mut self, itm: &mut cortex_m::peripheral::itm::Stim) {
if self.rb.is_empty() {
// iprintln!(itm, "RB is Empty!");
} else {
iprintln!(itm, "RB Contents: ");
while let Some(byte) = self.rb.dequeue() {
iprint!(itm, "{}", byte as char);
}
iprintln!(itm, "");
}
}
}