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I2C: prepare to support 10-bit addresses later

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This commit is contained in:
Björn Quentin 2024-12-24 11:13:06 +01:00
parent 848029b152
commit 8c56c7c64e
1 changed files with 93 additions and 42 deletions
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135
esp-hal/src/i2c/master/mod.rs
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@ -85,6 +85,50 @@ const I2C_CHUNK_SIZE: usize = 254;
// on ESP32 there is a chance to get trapped in `wait_for_completion` forever
const MAX_ITERATIONS: u32 = 1_000_000;
/// Address mode.
///
/// Note: This trait is sealed and should not be implemented outside of this
/// crate.
pub trait AddressMode: _private::AddressModeInternal + Copy + 'static {}
mod _private {
pub trait AddressModeInternal {
fn is_seven_bit(&self) -> bool;
fn as_u8(&self) -> u8;
fn as_u16(&self) -> u16;
}
}
/// 7-bit address mode type.
///
/// Note that 7-bit addresses defined by drivers should be specified in
/// **right-aligned** form, e.g. in the range `0x00..=0x7F`.
///
/// For example, a device that has the seven bit address of `0b011_0010`, and
/// therefore is addressed on the wire using:
///
/// * `0b0110010_0` or `0x64` for *writes*
/// * `0b0110010_1` or `0x65` for *reads*
pub type SevenBitAddress = u8;
impl AddressMode for SevenBitAddress {}
impl _private::AddressModeInternal for SevenBitAddress {
fn is_seven_bit(&self) -> bool {
true
}
fn as_u8(&self) -> u8 {
*self as u8
}
fn as_u16(&self) -> u16 {
unreachable!()
}
}
/// I2C-specific transmission errors
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
@ -377,9 +421,9 @@ impl<'d, Dm: DriverMode> I2c<'d, Dm> {
Ok(())
}
fn transaction_impl<'a>(
fn transaction_impl<'a, A: AddressMode>(
&mut self,
address: u8,
address: A,
operations: impl Iterator<Item = Operation<'a>>,
) -> Result<(), Error> {
let mut last_op: Option<OpKind> = None;
@ -500,14 +544,14 @@ impl<'d> I2c<'d, Blocking> {
}
/// Writes bytes to slave with address `address`
pub fn write(&mut self, address: u8, buffer: &[u8]) -> Result<(), Error> {
pub fn write<A: AddressMode>(&mut self, address: A, buffer: &[u8]) -> Result<(), Error> {
self.driver()
.write_blocking(address, buffer, true, true)
.inspect_err(|_| self.internal_recover())
}
/// Reads enough bytes from slave with `address` to fill `buffer`
pub fn read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Error> {
pub fn read<A: AddressMode>(&mut self, address: A, buffer: &mut [u8]) -> Result<(), Error> {
self.driver()
.read_blocking(address, buffer, true, true, false)
.inspect_err(|_| self.internal_recover())
@ -515,9 +559,9 @@ impl<'d> I2c<'d, Blocking> {
/// Writes bytes to slave with address `address` and then reads enough bytes
/// to fill `buffer` *in a single transaction*
pub fn write_read(
pub fn write_read<A: AddressMode>(
&mut self,
address: u8,
address: A,
write_buffer: &[u8],
read_buffer: &mut [u8],
) -> Result<(), Error> {
@ -550,9 +594,9 @@ impl<'d> I2c<'d, Blocking> {
/// to indicate writing
/// - `SR` = repeated start condition
/// - `SP` = stop condition
pub fn transaction<'a>(
pub fn transaction<'a, A: AddressMode>(
&mut self,
address: u8,
address: A,
operations: impl IntoIterator<Item = &'a mut Operation<'a>>,
) -> Result<(), Error> {
self.transaction_impl(address, operations.into_iter().map(Operation::from))
@ -688,7 +732,7 @@ impl<'d> I2c<'d, Async> {
}
/// Writes bytes to slave with address `address`
pub async fn write(&mut self, address: u8, buffer: &[u8]) -> Result<(), Error> {
pub async fn write<A: AddressMode>(&mut self, address: A, buffer: &[u8]) -> Result<(), Error> {
self.driver()
.write(address, buffer, true, true)
.await
@ -696,7 +740,11 @@ impl<'d> I2c<'d, Async> {
}
/// Reads enough bytes from slave with `address` to fill `buffer`
pub async fn read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Error> {
pub async fn read<A: AddressMode>(
&mut self,
address: A,
buffer: &mut [u8],
) -> Result<(), Error> {
self.driver()
.read(address, buffer, true, true, false)
.await
@ -705,9 +753,9 @@ impl<'d> I2c<'d, Async> {
/// Writes bytes to slave with address `address` and then reads enough
/// bytes to fill `buffer` *in a single transaction*
pub async fn write_read(
pub async fn write_read<A: AddressMode>(
&mut self,
address: u8,
address: A,
write_buffer: &[u8],
read_buffer: &mut [u8],
) -> Result<(), Error> {
@ -743,9 +791,9 @@ impl<'d> I2c<'d, Async> {
/// to indicate writing
/// - `SR` = repeated start condition
/// - `SP` = stop condition
pub async fn transaction<'a>(
pub async fn transaction<'a, A: AddressMode>(
&mut self,
address: u8,
address: A,
operations: impl IntoIterator<Item = &'a mut Operation<'a>>,
) -> Result<(), Error> {
self.transaction_impl_async(address, operations.into_iter().map(Operation::from))
@ -753,9 +801,9 @@ impl<'d> I2c<'d, Async> {
.inspect_err(|_| self.internal_recover())
}
async fn transaction_impl_async<'a>(
async fn transaction_impl_async<'a, A: AddressMode>(
&mut self,
address: u8,
address: A,
operations: impl Iterator<Item = Operation<'a>>,
) -> Result<(), Error> {
let mut last_op: Option<OpKind> = None;
@ -1329,9 +1377,9 @@ impl Driver<'_> {
/// - `start` indicates whether the operation should start by a START
/// condition and sending the address.
/// - `cmd_iterator` is an iterator over the command registers.
fn setup_write<'a, I>(
fn setup_write<'a, I, A: AddressMode>(
&self,
addr: u8,
addr: A,
bytes: &[u8],
start: bool,
cmd_iterator: &mut I,
@ -1367,7 +1415,7 @@ impl Driver<'_> {
// Load address and R/W bit into FIFO
write_fifo(
self.register_block(),
addr << 1 | OperationType::Write as u8,
addr.as_u8() << 1 | OperationType::Write as u8,
);
}
Ok(())
@ -1381,9 +1429,9 @@ impl Driver<'_> {
/// - `will_continue` indicates whether there is another read operation
/// following this one and we should not nack the last byte.
/// - `cmd_iterator` is an iterator over the command registers.
fn setup_read<'a, I>(
fn setup_read<'a, I, A: AddressMode>(
&self,
addr: u8,
addr: A,
buffer: &mut [u8],
start: bool,
will_continue: bool,
@ -1444,7 +1492,10 @@ impl Driver<'_> {
if start {
// Load address and R/W bit into FIFO
write_fifo(self.register_block(), addr << 1 | OperationType::Read as u8);
write_fifo(
self.register_block(),
addr.as_u8() << 1 | OperationType::Read as u8,
);
}
Ok(())
}
@ -1877,9 +1928,9 @@ impl Driver<'_> {
.write(|w| w.rxfifo_full().clear_bit_by_one());
}
fn start_write_operation(
fn start_write_operation<A: AddressMode>(
&self,
address: u8,
address: A,
bytes: &[u8],
start: bool,
stop: bool,
@ -1914,9 +1965,9 @@ impl Driver<'_> {
/// - `will_continue` indicates whether there is another read operation
/// following this one and we should not nack the last byte.
/// - `cmd_iterator` is an iterator over the command registers.
fn start_read_operation(
fn start_read_operation<A: AddressMode>(
&self,
address: u8,
address: A,
buffer: &mut [u8],
start: bool,
stop: bool,
@ -1949,9 +2000,9 @@ impl Driver<'_> {
/// - `stop` indicates whether the operation should end with a STOP
/// condition.
/// - `cmd_iterator` is an iterator over the command registers.
fn write_operation_blocking(
fn write_operation_blocking<A: AddressMode>(
&self,
address: u8,
address: A,
bytes: &[u8],
start: bool,
stop: bool,
@ -1981,9 +2032,9 @@ impl Driver<'_> {
/// - `will_continue` indicates whether there is another read operation
/// following this one and we should not nack the last byte.
/// - `cmd_iterator` is an iterator over the command registers.
fn read_operation_blocking(
fn read_operation_blocking<A: AddressMode>(
&self,
address: u8,
address: A,
buffer: &mut [u8],
start: bool,
stop: bool,
@ -2011,9 +2062,9 @@ impl Driver<'_> {
/// - `stop` indicates whether the operation should end with a STOP
/// condition.
/// - `cmd_iterator` is an iterator over the command registers.
async fn write_operation(
async fn write_operation<A: AddressMode>(
&self,
address: u8,
address: A,
bytes: &[u8],
start: bool,
stop: bool,
@ -2043,9 +2094,9 @@ impl Driver<'_> {
/// - `will_continue` indicates whether there is another read operation
/// following this one and we should not nack the last byte.
/// - `cmd_iterator` is an iterator over the command registers.
async fn read_operation(
async fn read_operation<A: AddressMode>(
&self,
address: u8,
address: A,
buffer: &mut [u8],
start: bool,
stop: bool,
@ -2065,9 +2116,9 @@ impl Driver<'_> {
Ok(())
}
fn read_blocking(
fn read_blocking<A: AddressMode>(
&self,
address: u8,
address: A,
buffer: &mut [u8],
start: bool,
stop: bool,
@ -2087,9 +2138,9 @@ impl Driver<'_> {
Ok(())
}
fn write_blocking(
fn write_blocking<A: AddressMode>(
&self,
address: u8,
address: A,
buffer: &[u8],
start: bool,
stop: bool,
@ -2110,9 +2161,9 @@ impl Driver<'_> {
Ok(())
}
async fn read(
async fn read<A: AddressMode>(
&self,
address: u8,
address: A,
buffer: &mut [u8],
start: bool,
stop: bool,
@ -2133,9 +2184,9 @@ impl Driver<'_> {
Ok(())
}
async fn write(
async fn write<A: AddressMode>(
&self,
address: u8,
address: A,
buffer: &[u8],
start: bool,
stop: bool,