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fix max sequence length

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This commit is contained in:
Jacob Rosenthal 2021-11-01 01:15:04 -07:00
parent 14dc524b84
commit 48673e27cd
1 changed files with 12 additions and 9 deletions
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21
embassy-nrf/src/pwm.rs
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@ -9,9 +9,10 @@ use embassy_hal_common::unborrow;
use crate::gpio::sealed::Pin as _;
use crate::gpio::OptionalPin as GpioOptionalPin;
use crate::interrupt::Interrupt;
use crate::pac;
use crate::util::slice_in_ram_or;
use crate::{pac, EASY_DMA_SIZE};
/// PWM Base clock is system clock (16MHz) divided by prescaler
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum Prescaler {
Div1,
@ -24,7 +25,7 @@ pub enum Prescaler {
Div128,
}
/// How a sequence is read from RAM and is spread to the compare register
/// How the sequence values are distributed across the channels
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum SequenceLoad {
/// Provided sequence will be used across all channels
@ -42,7 +43,9 @@ pub enum SequenceLoad {
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum CounterMode {
/// Up counter (edge-aligned PWM duty cycle)
Up,
/// Up and down counter (center-aligned PWM duty cycle)
UpAndDown,
}
@ -53,13 +56,13 @@ pub struct Pwm<'d, T: Instance> {
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum LoopMode {
// Repeat n additional times after the first
/// Repeat n additional times after the first
Additional(u16),
/// Repeat until `stop` is called
/// Repeat until `stop` is called.
Infinite,
}
// Configure an infinite looping sequence for `simple_playback`
/// Configure an infinite looping sequence for `simple_playback`
pub struct LoopingConfig<'a> {
/// Selects up mode or up-and-down mode for the counter
pub counter_mode: CounterMode,
@ -83,8 +86,8 @@ pub struct LoopingConfig<'a> {
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[non_exhaustive]
pub enum Error {
Seq0BufferTooLong,
Seq1BufferTooLong,
/// Max Sequence size is 32767
SequenceTooLong,
/// EasyDMA can only read from data memory, read only buffers in flash will fail.
DMABufferNotInDataMemory,
}
@ -171,8 +174,8 @@ impl<'d, T: Instance> Pwm<'d, T> {
) -> Result<Self, Error> {
slice_in_ram_or(config.sequence, Error::DMABufferNotInDataMemory)?;
if config.sequence.len() > EASY_DMA_SIZE {
return Err(Error::Seq0BufferTooLong);
if config.sequence.len() > 32767 {
return Err(Error::SequenceTooLong);
}
unborrow!(ch0, ch1, ch2, ch3);