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Fix zero-length-slice bugs

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This commit is contained in:
Grant Miller 2022-03-14 18:14:55 -05:00
parent 15c533fe2a
commit 71632648c7
1 changed files with 15 additions and 5 deletions
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20
embassy-stm32/src/spi/mod.rs
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@ -7,7 +7,7 @@ use embassy_hal_common::unborrow;
use futures::future::join;
use self::sealed::WordSize;
use crate::dma::{slice_ptr_parts, slice_ptr_parts_mut, NoDma, Transfer};
use crate::dma::{NoDma, Transfer};
use crate::gpio::sealed::{AFType, Pin as _};
use crate::gpio::AnyPin;
use crate::pac::spi::Spi as Regs;
@ -411,6 +411,10 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
where
Tx: TxDma<T>,
{
if data.len() == 0 {
return Ok(())
}
self.set_word_size(W::WORDSIZE);
unsafe {
T::REGS.cr1().modify(|w| {
@ -449,6 +453,10 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
Tx: TxDma<T>,
Rx: RxDma<T>,
{
if data.len() == 0 {
return Ok(())
}
self.set_word_size(W::WORDSIZE);
unsafe {
T::REGS.cr1().modify(|w| {
@ -457,7 +465,7 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
set_rxdmaen(T::REGS, true);
}
let (_, clock_byte_count) = slice_ptr_parts_mut(data);
let clock_byte_count = data.len();
let rx_request = self.rxdma.request();
let rx_src = T::REGS.rx_ptr();
@ -498,9 +506,11 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
Tx: TxDma<T>,
Rx: RxDma<T>,
{
let (_, rx_len) = slice_ptr_parts(read);
let (_, tx_len) = slice_ptr_parts(write);
assert_eq!(rx_len, tx_len);
assert_eq!(read.len(), write.len());
if read.len() == 0 {
return Ok(())
}
self.set_word_size(W::WORDSIZE);
unsafe {