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use crate::command::{rx, xmit, Command, CommandResponse, CommandResponseStatus};
use crate::Error;
use scroll::{ctx, Pread, Pwrite, LE};
pub fn read_words(
d: &hidapi::HidDevice,
target_address: u32,
num_words: u32,
) -> Result<ReadWordsResponse, Error> {
let mut buffer = vec![0_u8; 8];
let mut offset = 0;
buffer.gwrite_with(target_address, &mut offset, scroll::LE)?;
buffer.gwrite_with(num_words, &mut offset, scroll::LE)?;
xmit(Command::new(0x0008, 0, buffer), d)?;
match rx(d) {
Ok(CommandResponse {
status: CommandResponseStatus::Success,
data,
..
}) => (data.as_slice()).pread_with(0, LE),
Ok(_) => Err(Error::CommandNotRecognized),
Err(e) => Err(e),
}
}
#[derive(Debug, PartialEq)]
pub struct ReadWordsResponse {
pub words: Vec<u32>,
}
impl<'a> ctx::TryFromCtx<'a, scroll::Endian> for ReadWordsResponse {
type Error = Error;
fn try_from_ctx(this: &'a [u8], le: scroll::Endian) -> Result<(Self, usize), Self::Error> {
if this.len() < 4 {
return Err(Error::Parse);
}
let mut words: Vec<u32> = vec![0; this.len() / 4];
let mut offset = 0;
this.gread_inout_with(&mut offset, &mut words, le)?;
Ok((ReadWordsResponse { words }, offset))
}
}