Implementing `impl From<SystemClock> for Hertz` is a footgun, as
SystemClock is not Copy, so the automatic conversion consumes the
owned clock.
This is visible in the example i2c.rs:
```
let mut i2c = hal::I2C::i2c1(
pac.I2C1,
sda_pin,
scl_pin, // Try `not_an_scl_pin` here
400.kHz(),
&mut pac.RESETS,
clocks.peripheral_clock,
);
```
If the user wants to use both `i2c0` and `i2c1` at the same time,
copying from this example won't work:
```
error[E0382]: use of moved value: `clocks.peripheral_clock`
--> rp2040-hal/examples/i2c.rs:106:9
|
97 | clocks.peripheral_clock,
| ----------------------- value moved here
...
106 | clocks.peripheral_clock,
| ^^^^^^^^^^^^^^^^^^^^^^^ value used here after move
|
= note: move occurs because `clocks.peripheral_clock` has type
`PeripheralClock`, which does not implement the `Copy` trait
```
As getting the frequency from a clock doesn't really need ownership,
changing it to `impl From<&SystemClock> for Hertz` is both more
logical and provides better usability.
This is, however, a breaking change: Code relying on this trait
implementation needs to be changed by adding a `&`.
* add example of synchronized PIOs
* Synchronize state machines using WAIT IRQ instruction
* Use "irq wait 0" instead of "wait 1 irq 0"
This way, the initial value of the interrupt flag doesn't matter
* Start state machines synchronized without IRQ WAIT instruction
* Improve API
Co-authored-by: Andrew Straw <strawman@astraw.com>
* Update changelog for 0.4.0 release
* Enable rt feature for irq example in Cargo.toml
* Bump pio/pio-proc deps to 0.2.0, update pio examples
* Update BSPs to latest ws2812-pio, remove unused pio dep
* Fix usage of pio_proc in doc comment
* Clean up pio doc-example
* Update rp-pico to latest i2c-pio
Co-authored-by: Jan Niehusmann <jan@gondor.com>
Make all ROM functions (normal and floating point) provide both a direct
call that does the operation and a module with a ptr() function to get
the function pointer.
* Add basic multicore fifo example
* Add documentation for multicore
* Send system_clock frequency to core1 over FIFO in example
* Add Stack::new() to HAL. Use Stack::new() in example
* Implements methods to allow presetting the pin state & direction
Enabling those methods allows to save a few valuable instructions
in the PIO's memory.
* Update pio_proc_blink with new set_pindirs
