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Update in the application's workflow
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@mshetairy
mshetairy committed Nov 10, 2020
1 parent bed4bff commit 84dec3f
Showing 1 changed file with 104 additions and 46 deletions.
150 changes: 104 additions & 46 deletions examples/nfct_test.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,41 @@ mod example {
use libtock_drivers::timer::Timer;
use libtock_drivers::timer::Timestamp;

#[derive(Copy, Clone, Debug, PartialEq)]
enum ReturnCode {
/// Operation completed successfully
SUCCESS,
/// Generic failure condition
FAIL,
/// Underlying system is busy; retry
EBUSY,
/// The component is powered down
EOFF,
/// An invalid parameter was passed
EINVAL,
/// Operation canceled by a call
ECANCEL,
/// Memory required not available
ENOMEM,
/// Operation or command is unsupported
ENOSUPPORT,
}

impl From<isize> for ReturnCode {
fn from(original: isize) -> ReturnCode {
match original {
0 => ReturnCode::SUCCESS,
-1 => ReturnCode::FAIL,
-2 => ReturnCode::EBUSY,
-4 => ReturnCode::EOFF,
-6 => ReturnCode::EINVAL,
-8 => ReturnCode::ECANCEL,
-9 => ReturnCode::ENOMEM,
_ => ReturnCode::ENOSUPPORT,
}
}
}

/// Helper function to write on console the received packet.
fn print_rx_buffer(buf: &mut [u8]) {
if let Some((last, bytes)) = buf.split_last() {
Expand All @@ -44,11 +79,20 @@ mod example {
}

/// Function to identify the time elapsed for a transmission request.
fn bench_transmit(console: &mut Console, timer: &Timer, title: &str, mut buf: &mut [u8]) {
fn bench_transmit(
console: &mut Console,
timer: &Timer,
title: &str,
mut buf: &mut [u8],
) -> ReturnCode {
let amount = buf.len();
let start = Timestamp::<f64>::from_clock_value(timer.get_current_clock().flex_unwrap());
match NfcTag::transmit(&mut buf, amount) {
Ok(_) => (),
Err(TockError::Command(CommandError {
return_code: -8, /* ECANCEL: No Field*/
..
})) => return ReturnCode::ECANCEL,
Err(_) => writeln!(Console::new(), " -- tx error!").unwrap(),
}
let end = Timestamp::<f64>::from_clock_value(timer.get_current_clock().flex_unwrap());
Expand All @@ -63,9 +107,10 @@ mod example {
)
.unwrap();
console.flush();
ReturnCode::SUCCESS
}

fn receive_packet(console: &mut Console, mut buf: &mut [u8; 256]) -> bool {
fn receive_packet(console: &mut Console, mut buf: &mut [u8; 256]) -> ReturnCode {
match NfcTag::receive(&mut buf) {
Ok(RecvOp {
recv_amount: amount,
Expand All @@ -75,74 +120,71 @@ mod example {
print_rx_buffer(&mut buf[..amount]);
}
}
Err(TockError::Command(CommandError {
return_code: -4, /* EOFF: Not Ready */
..
})) => return false,
// For the example app, just print any other received error without handling.
Err(TockError::Command(CommandError {
return_code: value, ..
})) => writeln!(console, " -- Err({})!", value).unwrap(),
Err(_) => writeln!(console, " -- RX Err").unwrap(),
Err(TockError::Command(CommandError { return_code, .. })) => return return_code.into(),
Err(_) => {
writeln!(console, " -- RX Err").unwrap();
return ReturnCode::ECANCEL;
}
}
true
ReturnCode::SUCCESS
}

fn transmit_reply(mut console: &mut Console, timer: &Timer, buf: &[u8]) -> bool {
fn transmit_reply(mut console: &mut Console, timer: &Timer, buf: &[u8]) -> ReturnCode {
let mut return_code = ReturnCode::SUCCESS;
match buf[0] {
0xe0 /* RATS */=> {
let mut answer_to_select = [0x05, 0x78, 0x80, 0xB1, 0x00];
bench_transmit(&mut console, &timer, "TX: ATS", &mut answer_to_select);
return_code = bench_transmit(&mut console, &timer, "TX: ATS", &mut answer_to_select);
}
0xc2 /* DESELECT */ => {
// Ignore the request
let mut command_error = [0x6A, 0x81];
bench_transmit(&mut console, &timer, "TX: DESELECT", &mut command_error);
return_code = bench_transmit(&mut console, &timer, "TX: DESELECT", &mut command_error);
}
0x02 | 0x03 /* APDU Prefix */ => match buf[2] {
// If the received packet is applet selection command (FIDO 2)
0xa4 /* SELECT */ => if buf[3] == 0x04 && buf[5] == 0x08 && buf[6] == 0xa0 {
// Vesion: "FIDO_2_0"
let mut reply = [buf[0], 0x46, 0x49, 0x44, 0x4f, 0x5f, 0x32, 0x5f, 0x30, 0x90, 0x00,];
bench_transmit(&mut console, &timer, "TX: Version Str", &mut reply);
} else {
let mut reply = [buf[0], 0x90, 0x00];
bench_transmit(&mut console, &timer, "TX: 0x9000", &mut reply);
}
// Vesion: "FIDO_2_0"
let mut reply = [buf[0], 0x46, 0x49, 0x44, 0x4f, 0x5f, 0x32, 0x5f, 0x30, 0x90, 0x00,];
return_code = bench_transmit(&mut console, &timer, "TX: Version Str", &mut reply);
} else if (buf[6] == 0xd2 && buf[7] == 0x76) || (buf[6] == 0xe1 && (buf[7] == 0x03 || buf[7] == 0x04)){
let mut reply = [buf[0], 0x90, 0x00];
return_code = bench_transmit(&mut console, &timer, "TX: 0x9000", &mut reply);
} else /* Unknown file */ {
let mut reply = [buf[0], 0x6a, 0x82];
return_code = bench_transmit(&mut console, &timer, "TX: 0x6A82", &mut reply);
}
0xb0 /* READ */ => match buf[5] {
0x02 => {
0x02 => {
let mut reply = [buf[0], 0x12, 0x90, 0x00,];
bench_transmit(&mut console, &timer, "TX: File Size", &mut reply);
return_code = bench_transmit(&mut console, &timer, "TX: File Size", &mut reply);
}
0x12 => {
let mut reply = [buf[0], 0xd1, 0x01, 0x0e, 0x55, 0x77, 0x77, 0x77, 0x2e, 0x6f, 0x70, 0x65,
0x6e, 0x73, 0x6b, 0x2e, 0x64, 0x65, 0x76, 0x90, 0x00,];
bench_transmit(&mut console, &timer, "TX: NDEF", &mut reply);
return_code = bench_transmit(&mut console, &timer, "TX: NDEF", &mut reply);
}
0x0f => {
let mut reply = [buf[0], 0x00, 0x0f, 0x20, 0x00, 0x7f, 0x00, 0x7f, 0x04, 0x06, 0xe1, 0x04,
0x00, 0x7f, 0x00, 0x00, 0x90, 0x00,];
bench_transmit(&mut console, &timer, "TX: CC", &mut reply);
return_code = bench_transmit(&mut console, &timer, "TX: CC", &mut reply);
}
_ => {
let mut reply = [buf[0], 0x90, 0x00];
bench_transmit(&mut console, &timer, "TX: 0x9000", &mut reply);
return_code = bench_transmit(&mut console, &timer, "TX: 0x9000", &mut reply);
}
}
_ => {
let mut reply = [buf[0], 0x90, 0x00];
bench_transmit(&mut console, &timer, "TX: 0x9000", &mut reply);
return_code = bench_transmit(&mut console, &timer, "TX: 0x9000", &mut reply);
}
}
0x26 | 0x52 | 0x50 /* REQA | WUPA | Halt */ => {
if NfcTag::disable_emulation() {
writeln!(console, " -- TAG DISABLED").unwrap();
}
return false;
return ReturnCode::EOFF;
}
_ => (),
}
true
return_code
}

pub fn nfc(mut console: &mut Console) {
Expand All @@ -160,19 +202,35 @@ mod example {

let mut state_change_counter = 0;
loop {
while !NfcTag::enable_emulation() {}
// Configure Type 4 tag
while !NfcTag::configure(4) {}
state_change_counter += 1;
loop {
let mut rx_buf = [0; 256];
// Await a successful receive
while !receive_packet(&mut console, &mut rx_buf) {}
// If the reader restarts the communication and we can't
// reply to the received packet, then disable the tag.
if !transmit_reply(&mut console, &timer, &rx_buf) {
state_change_counter += 1;
break;
let mut rx_buf = [0; 256];
match receive_packet(&mut console, &mut rx_buf) {
ReturnCode::EOFF => {
// Not configured
while !NfcTag::enable_emulation() {}
// Configure Type 4 tag
while !NfcTag::configure(4) {}
}
ReturnCode::ECANCEL /* field lost */ => {
NfcTag::disable_emulation();
}
ReturnCode::EBUSY /* awaiting select*/ => (),
ReturnCode::ENOMEM => {
writeln!(console, " -- Amount more than buffer limit").unwrap()
}
ReturnCode::FAIL => writeln!(console, " -- Invalid CRC").unwrap(),
ReturnCode::EINVAL /* covered in driver interface */ => (),
ReturnCode::ENOSUPPORT => (),
ReturnCode::SUCCESS => {
// If the reader restarts the communication then disable the tag.
match transmit_reply(&mut console, &timer, &rx_buf) {
ReturnCode::ECANCEL | ReturnCode::EOFF => {
if NfcTag::disable_emulation() {
writeln!(console, " -- TAG DISABLED").unwrap();
}
state_change_counter += 1;
}
_ => (),
}
}
}
if state_change_counter > 100 {
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