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use core::convert::{TryFrom, TryInto};
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(C)]
pub struct RequestType(u8);
impl RequestType {
pub fn recipient(&self) -> Result<RequestRecipient, &'static str> {
const POS: u8 = 0;
const MASK: u8 = 0x1f;
(self.0 & (MASK << POS)).try_into()
}
pub fn set_recipient(&mut self, v: RequestRecipient) {
const POS: u8 = 0;
const MASK: u8 = 0x1f;
self.0 &= !(MASK << POS);
self.0 |= v as u8 & MASK;
}
pub fn kind(&self) -> Result<RequestKind, &'static str> {
const POS: u8 = 5;
const MASK: u8 = 0x3;
(self.0 & (MASK << POS)).try_into()
}
pub fn set_kind(&mut self, v: RequestKind) {
const POS: u8 = 5;
const MASK: u8 = 0x3;
self.0 &= !(MASK << POS);
self.0 |= v as u8 & MASK;
}
pub fn direction(&self) -> Result<RequestDirection, &'static str> {
const POS: u8 = 7;
const MASK: u8 = 0x1;
(self.0 & (MASK << POS)).try_into()
}
pub fn set_direction(&mut self, v: RequestDirection) {
const POS: u8 = 7;
const MASK: u8 = 0x1;
self.0 &= !(MASK << POS);
self.0 |= v as u8 & MASK;
}
}
impl From<(RequestDirection, RequestKind, RequestRecipient)> for RequestType {
fn from(v: (RequestDirection, RequestKind, RequestRecipient)) -> Self {
Self(v.0 as u8 | v.1 as u8 | v.2 as u8)
}
}
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum RequestDirection {
HostToDevice = 0x00,
DeviceToHost = 0x80,
}
impl TryFrom<u8> for RequestDirection {
type Error = &'static str;
fn try_from(v: u8) -> Result<Self, Self::Error> {
match v {
0x00 => Ok(Self::HostToDevice),
0x80 => Ok(Self::DeviceToHost),
_ => Err("direction can only be 0x00 or 0x80"),
}
}
}
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum RequestKind {
Standard = 0x00,
Class = 0x20,
Vendor = 0x40,
}
impl TryFrom<u8> for RequestKind {
type Error = &'static str;
fn try_from(v: u8) -> Result<Self, Self::Error> {
match v {
0x00 => Ok(Self::Standard),
0x20 => Ok(Self::Class),
0x40 => Ok(Self::Vendor),
_ => Err("type can only be 0x00, 0x20, or 0x40"),
}
}
}
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum RequestRecipient {
Device = 0x00,
Interface = 0x01,
Endpoint = 0x02,
Other = 0x03,
}
impl TryFrom<u8> for RequestRecipient {
type Error = &'static str;
fn try_from(v: u8) -> Result<Self, Self::Error> {
match v {
0x00 => Ok(Self::Device),
0x01 => Ok(Self::Interface),
0x02 => Ok(Self::Endpoint),
0x03 => Ok(Self::Other),
_ => Err("recipient can only be between 0 and 3"),
}
}
}
#[derive(Clone, Copy, Debug, Default, PartialEq)]
#[repr(C)]
pub struct WValue(u16);
impl WValue {
pub fn w_value_lo(&self) -> u8 {
const POS: u8 = 0;
const MASK: u16 = 0xff;
((self.0 >> POS) & MASK) as u8
}
pub fn set_w_value_lo(&mut self, v: u8) {
const POS: u8 = 0;
const MASK: u8 = 0xff;
self.0 &= !((MASK as u16) << POS);
self.0 |= ((v & MASK) as u16) << POS;
}
pub fn w_value_hi(&self) -> u8 {
const POS: u8 = 8;
const MASK: u16 = 0xff;
((self.0 >> POS) & MASK) as u8
}
pub fn set_w_value_hi(&mut self, v: u8) {
const POS: u8 = 8;
const MASK: u8 = 0xff;
self.0 &= !((MASK as u16) << POS);
self.0 |= ((v & MASK) as u16) << POS;
}
}
impl From<(u8, u8)> for WValue {
fn from(v: (u8, u8)) -> Self {
let mut rc = Self(0);
rc.set_w_value_lo(v.0);
rc.set_w_value_hi(v.1);
rc
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum RequestCode {
GetStatus = 0,
ClearFeature = 1,
SetFeature = 3,
SetAddress = 5,
GetDescriptor = 6,
SetDescriptor = 7,
GetConfiguration = 8,
SetConfiguration = 9,
GetInterface = 10,
SetInterface = 11,
SynchFrame = 12,
}
impl TryFrom<u8> for RequestCode {
type Error = &'static str;
fn try_from(v: u8) -> Result<Self, Self::Error> {
match v {
0 => Ok(Self::GetStatus),
1 => Ok(Self::ClearFeature),
3 => Ok(Self::SetFeature),
5 => Ok(Self::SetAddress),
6 => Ok(Self::GetDescriptor),
7 => Ok(Self::SetDescriptor),
8 => Ok(Self::GetConfiguration),
9 => Ok(Self::SetConfiguration),
10 => Ok(Self::GetInterface),
11 => Ok(Self::SetInterface),
12 => Ok(Self::SynchFrame),
_ => Err("invalid request value"),
}
}
}
impl Default for RequestCode {
fn default() -> Self {
Self::GetStatus
}
}
#[derive(Copy, Clone, Debug)]
#[repr(C, packed)]
pub struct SetupPacket {
pub bm_request_type: RequestType,
pub b_request: RequestCode,
pub w_value: WValue,
pub w_index: u16,
pub w_length: u16,
}
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