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|
#[cfg(gpio_v2)]
use crate::gpio::Pull;
use crate::gpio::{AfType, OutputType, Speed};
use crate::time::Hertz;
#[repr(u8)]
#[derive(Debug, Copy, Clone)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
/// Bits of the I2C OA2 register to mask out.
pub enum AddrMask {
/// No mask
NOMASK,
/// OA2\[1\] is masked and don’t care. Only OA2\[7:2\] are compared.
MASK1,
/// OA2\[2:1\] are masked and don’t care. Only OA2\[7:3\] are compared.
MASK2,
/// OA2\[3:1\] are masked and don’t care. Only OA2\[7:4\] are compared.
MASK3,
/// OA2\[4:1\] are masked and don’t care. Only OA2\[7:5\] are compared.
MASK4,
/// OA2\[5:1\] are masked and don’t care. Only OA2\[7:6\] are compared.
MASK5,
/// OA2\[6:1\] are masked and don’t care. Only OA2\[7:6\] are compared.
MASK6,
/// OA2\[7:1\] are masked and don’t care. No comparison is done, and all (except reserved) 7-bit received addresses are acknowledged
MASK7,
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
/// An I2C address. Either 7 or 10 bit.
pub enum Address {
/// A 7 bit address
SevenBit(u8),
/// A 10 bit address.
///
/// When using an address to configure the Own Address, only the OA1 register can be set to a 10-bit address.
TenBit(u16),
}
impl From<u8> for Address {
fn from(value: u8) -> Self {
Address::SevenBit(value)
}
}
impl From<u16> for Address {
fn from(value: u16) -> Self {
assert!(value < 0x400, "Ten bit address must be less than 0x400");
Address::TenBit(value)
}
}
impl Address {
/// Get the inner address as a u16.
///
/// For 7 bit addresses, the u8 that was used to store the address is returned as a u16.
pub fn addr(&self) -> u16 {
match self {
Address::SevenBit(addr) => *addr as u16,
Address::TenBit(addr) => *addr,
}
}
}
#[derive(Debug, Copy, Clone)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
/// The second Own Address register.
pub struct OA2 {
/// The address.
pub addr: u8,
/// The bit mask that will affect how the own address 2 register is compared.
pub mask: AddrMask,
}
#[derive(Debug, Copy, Clone)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
/// The Own Address(es) of the I2C peripheral.
pub enum OwnAddresses {
/// Configuration for only the OA1 register.
OA1(Address),
/// Configuration for only the OA2 register.
OA2(OA2),
/// Configuration for both the OA1 and OA2 registers.
Both {
/// The [Address] for the OA1 register.
oa1: Address,
/// The [OA2] configuration.
oa2: OA2,
},
}
/// Slave Configuration
#[derive(Debug, Copy, Clone)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct SlaveAddrConfig {
/// Target Address(es)
pub addr: OwnAddresses,
/// Control if the peripheral should respond to the general call address
pub general_call: bool,
}
impl SlaveAddrConfig {
/// Create a new slave address configuration with only the OA1 register set in 7 bit mode and the general call disabled.
pub fn basic(addr: u8) -> Self {
Self {
addr: OwnAddresses::OA1(Address::SevenBit(addr)),
general_call: false,
}
}
}
/// I2C config
#[non_exhaustive]
#[derive(Copy, Clone)]
pub struct Config {
/// Frequency
pub frequency: Hertz,
/// GPIO Speed
pub gpio_speed: Speed,
/// Enable internal pullup on SDA.
///
/// Using external pullup resistors is recommended for I2C. If you do
/// have external pullups you should not enable this.
#[cfg(gpio_v2)]
pub sda_pullup: bool,
/// Enable internal pullup on SCL.
///
/// Using external pullup resistors is recommended for I2C. If you do
/// have external pullups you should not enable this.
#[cfg(gpio_v2)]
pub scl_pullup: bool,
/// Timeout.
#[cfg(feature = "time")]
pub timeout: embassy_time::Duration,
}
impl Default for Config {
fn default() -> Self {
Self {
frequency: Hertz::khz(100),
gpio_speed: Speed::Medium,
#[cfg(gpio_v2)]
sda_pullup: false,
#[cfg(gpio_v2)]
scl_pullup: false,
#[cfg(feature = "time")]
timeout: embassy_time::Duration::from_millis(1000),
}
}
}
impl Config {
pub(super) fn scl_af(&self) -> AfType {
#[cfg(gpio_v1)]
return AfType::output(OutputType::OpenDrain, self.gpio_speed);
#[cfg(gpio_v2)]
return AfType::output_pull(
OutputType::OpenDrain,
self.gpio_speed,
match self.scl_pullup {
true => Pull::Up,
false => Pull::None,
},
);
}
pub(super) fn sda_af(&self) -> AfType {
#[cfg(gpio_v1)]
return AfType::output(OutputType::OpenDrain, self.gpio_speed);
#[cfg(gpio_v2)]
return AfType::output_pull(
OutputType::OpenDrain,
self.gpio_speed,
match self.sda_pullup {
true => Pull::Up,
false => Pull::None,
},
);
}
}
|
