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Add SetConfig impl to rp2040 i2c

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Also expand test to cover 1kHz, 100kHz, 400kHz, and 1MHz speeds.
This commit is contained in:
Caleb Jamison 2024-02-22 06:05:51 -05:00
parent 69bfcaad42
commit 0c6d3ea051
3 changed files with 115 additions and 68 deletions
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86
embassy-rp/src/i2c.rs
View file

@ -43,6 +43,18 @@ pub enum Error {
AddressReserved(u16),
}
/// I2C Config error
#[derive(Debug, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum ConfigError {
/// Max i2c speed is 1MHz
FrequencyTooHigh,
/// The sys clock is too slow to support given frequency
ClockTooSlow,
/// The sys clock is too fast to support given frequency
ClockTooFast,
}
/// I2C config.
#[non_exhaustive]
#[derive(Copy, Clone)]
@ -365,37 +377,32 @@ impl<'d, T: Instance + 'd, M: Mode> I2c<'d, T, M> {
) -> Self {
into_ref!(_peri);
assert!(config.frequency <= 1_000_000);
assert!(config.frequency > 0);
let p = T::regs();
let reset = T::reset();
crate::reset::reset(reset);
crate::reset::unreset_wait(reset);
p.ic_enable().write(|w| w.set_enable(false));
// Select controller mode & speed
p.ic_con().modify(|w| {
// Always use "fast" mode (<= 400 kHz, works fine for standard
// mode too)
w.set_speed(i2c::vals::Speed::FAST);
w.set_master_mode(true);
w.set_ic_slave_disable(true);
w.set_ic_restart_en(true);
w.set_tx_empty_ctrl(true);
});
// Set FIFO watermarks to 1 to make things simpler. This is encoded
// by a register value of 0.
p.ic_tx_tl().write(|w| w.set_tx_tl(0));
p.ic_rx_tl().write(|w| w.set_rx_tl(0));
// Configure SCL & SDA pins
set_up_i2c_pin(&scl);
set_up_i2c_pin(&sda);
let mut me = Self { phantom: PhantomData };
if let Err(e) = me.set_config_inner(&config) {
panic!("Error configuring i2c: {}", e);
}
me
}
fn set_config_inner(&mut self, config: &Config) -> Result<(), ConfigError> {
if config.frequency > 1_000_000 {
return Err(ConfigError::FrequencyTooHigh);
}
let p = T::regs();
p.ic_enable().write(|w| w.set_enable(false));
// Configure baudrate
// There are some subtleties to I2C timing which we are completely
@ -407,11 +414,14 @@ impl<'d, T: Instance + 'd, M: Mode> I2c<'d, T, M> {
let lcnt = period * 3 / 5; // spend 3/5 (60%) of the period low
let hcnt = period - lcnt; // and 2/5 (40%) of the period high
warn!("cb:{} h:{:x} l:{:x}", clk_base, hcnt, lcnt);
// Check for out-of-range divisors:
assert!(hcnt <= 0xffff);
assert!(lcnt <= 0xffff);
assert!(hcnt >= 8);
assert!(lcnt >= 8);
if hcnt > 0xffff || lcnt > 0xffff {
return Err(ConfigError::ClockTooFast);
}
if hcnt < 8 || lcnt < 8 {
return Err(ConfigError::ClockTooSlow);
}
// Per I2C-bus specification a device in standard or fast mode must
// internally provide a hold time of at least 300ns for the SDA
@ -424,14 +434,20 @@ impl<'d, T: Instance + 'd, M: Mode> I2c<'d, T, M> {
((clk_base * 3) / 10_000_000) + 1
} else {
// fast mode plus requires a clk_base > 32MHz
assert!(clk_base >= 32_000_000);
if clk_base <= 32_000_000 {
return Err(ConfigError::ClockTooSlow);
}
// sda_tx_hold_count = clk_base [cycles/s] * 120ns * (1s /
// 1e9ns) Reduce 120/1e9 to 3/25e6 to avoid numbers that don't
// fit in uint. Add 1 to avoid division truncation.
((clk_base * 3) / 25_000_000) + 1
};
assert!(sda_tx_hold_count <= lcnt - 2);
/*
if sda_tx_hold_count <= lcnt - 2 {
return Err(ConfigError::HoldCountOutOfRange);
}
*/
p.ic_fs_scl_hcnt().write(|w| w.set_ic_fs_scl_hcnt(hcnt as u16));
p.ic_fs_scl_lcnt().write(|w| w.set_ic_fs_scl_lcnt(lcnt as u16));
@ -440,10 +456,9 @@ impl<'d, T: Instance + 'd, M: Mode> I2c<'d, T, M> {
p.ic_sda_hold()
.modify(|w| w.set_ic_sda_tx_hold(sda_tx_hold_count as u16));
// Enable I2C block
p.ic_enable().write(|w| w.set_enable(true));
Self { phantom: PhantomData }
Ok(())
}
fn setup(addr: u16) -> Result<(), Error> {
@ -757,6 +772,15 @@ where
}
}
impl<'d, T: Instance, M: Mode> embassy_embedded_hal::SetConfig for I2c<'d, T, M> {
type Config = Config;
type ConfigError = ConfigError;
fn set_config(&mut self, config: &Self::Config) -> Result<(), Self::ConfigError> {
self.set_config_inner(config)
}
}
/// Check if address is reserved.
pub fn i2c_reserved_addr(addr: u16) -> bool {
((addr & 0x78) == 0 || (addr & 0x78) == 0x78) && addr != 0

1
tests/rp/Cargo.toml
View file

@ -14,6 +14,7 @@ embassy-rp = { version = "0.1.0", path = "../../embassy-rp", features = [ "defmt
embassy-futures = { version = "0.1.0", path = "../../embassy-futures" }
embassy-net = { version = "0.4.0", path = "../../embassy-net", features = ["defmt", "tcp", "udp", "dhcpv4", "medium-ethernet"] }
embassy-net-wiznet = { version = "0.1.0", path = "../../embassy-net-wiznet", features = ["defmt"] }
embassy-embedded-hal = { version = "0.1.0", path = "../../embassy-embedded-hal/"}
cyw43 = { path = "../../cyw43", features = ["defmt", "firmware-logs"] }
cyw43-pio = { path = "../../cyw43-pio", features = ["defmt", "overclock"] }
perf-client = { path = "../perf-client" }

62
tests/rp/src/bin/i2c.rs
View file

@ -3,7 +3,10 @@
teleprobe_meta::target!(b"rpi-pico");
use defmt::{assert_eq, info, panic, unwrap};
use embassy_executor::Executor;
use embassy_embedded_hal::SetConfig;
use embassy_executor::{Executor, Spawner};
use embassy_rp::clocks::{PllConfig, XoscConfig};
use embassy_rp::config::Config as rpConfig;
use embassy_rp::multicore::{spawn_core1, Stack};
use embassy_rp::peripherals::{I2C0, I2C1};
use embassy_rp::{bind_interrupts, i2c, i2c_slave};
@ -13,7 +16,6 @@ use static_cell::StaticCell;
use {defmt_rtt as _, panic_probe as _, panic_probe as _, panic_probe as _};
static mut CORE1_STACK: Stack<1024> = Stack::new();
static EXECUTOR0: StaticCell<Executor> = StaticCell::new();
static EXECUTOR1: StaticCell<Executor> = StaticCell::new();
use crate::i2c::AbortReason;
@ -44,10 +46,7 @@ async fn device_task(mut dev: i2c_slave::I2cSlave<'static, I2C1>) -> ! {
Ok(x) => match x {
i2c_slave::ReadStatus::Done => break,
i2c_slave::ReadStatus::NeedMoreBytes => count += 1,
i2c_slave::ReadStatus::LeftoverBytes(x) => {
info!("tried to write {} extra bytes", x);
break;
}
i2c_slave::ReadStatus::LeftoverBytes(x) => panic!("tried to write {} extra bytes", x),
},
Err(e) => match e {
embassy_rp::i2c_slave::Error::Abort(AbortReason::Other(n)) => panic!("Other {:b}", n),
@ -92,6 +91,8 @@ async fn device_task(mut dev: i2c_slave::I2cSlave<'static, I2C1>) -> ! {
resp_buff[i] = i as u8;
}
dev.respond_to_read(&resp_buff).await.unwrap();
// reset count for next round of tests
count = 0xD0;
}
x => panic!("Invalid Write Read {:x}", x),
}
@ -104,8 +105,7 @@ async fn device_task(mut dev: i2c_slave::I2cSlave<'static, I2C1>) -> ! {
}
}
#[embassy_executor::task]
async fn controller_task(mut con: i2c::I2c<'static, I2C0, i2c::Async>) {
async fn controller_task(con: &mut i2c::I2c<'static, I2C0, i2c::Async>) {
info!("Device start");
{
@ -179,13 +179,29 @@ async fn controller_task(mut con: i2c::I2c<'static, I2C0, i2c::Async>) {
info!("large write_read - OK")
}
info!("Test OK");
cortex_m::asm::bkpt();
}
#[embassy_executor::main]
async fn main(_core0_spawner: Spawner) {
let mut config = rpConfig::default();
// Configure clk_sys to 48MHz to support 1kHz scl.
// In theory it can go lower, but we won't bother to test below 1kHz.
config.clocks.xosc = Some(XoscConfig {
hz: 12_000_000,
delay_multiplier: 128,
sys_pll: Some(PllConfig {
refdiv: 1,
fbdiv: 120,
post_div1: 6,
post_div2: 5,
}),
usb_pll: Some(PllConfig {
refdiv: 1,
fbdiv: 120,
post_div1: 6,
post_div2: 5,
}),
});
#[cortex_m_rt::entry]
fn main() -> ! {
let p = embassy_rp::init(Default::default());
let p = embassy_rp::init(config);
info!("Hello World!");
let d_sda = p.PIN_19;
@ -199,13 +215,19 @@ fn main() -> ! {
executor1.run(|spawner| unwrap!(spawner.spawn(device_task(device))));
});
let executor0 = EXECUTOR0.init(Executor::new());
let c_sda = p.PIN_21;
let c_scl = p.PIN_20;
let mut config = i2c::Config::default();
config.frequency = 5_000;
let controller = i2c::I2c::new_async(p.I2C0, c_sda, c_scl, Irqs, config);
let mut controller = i2c::I2c::new_async(p.I2C0, c_sda, c_scl, Irqs, Default::default());
executor0.run(|spawner| unwrap!(spawner.spawn(controller_task(controller))));
for freq in [1000, 100_000, 400_000, 1_000_000] {
info!("testing at {}hz", freq);
let mut config = i2c::Config::default();
config.frequency = freq;
controller.set_config(&config).unwrap();
controller_task(&mut controller).await;
}
info!("Test OK");
cortex_m::asm::bkpt();
}
}