20240718

src/channels.rs

@@ -23,22 +23,8 @@ macro_rules! set_nchs_on_off {
  on: &[u16; $num],
  off: &[u16; $num],
  ) -> Result<(), Error<E>> {
- let mut data = [0; 1 + $num * 4];
- data[0] = get_register_on(start);
- for (i, (on, off)) in on.iter().zip(off).enumerate() {
- if *on > 4095 || *off > 4095 {
- return Err(Error::InvalidInputData);
- }
- data[i * 4 + 1] = *on as u8;
- data[i * 4 + 2] = (*on >> 8) as u8;
- data[i * 4 + 3] = *off as u8;
- data[i * 4 + 4] = (*off >> 8) as u8;
- }
- self.enable_auto_increment().await?;
- self.i2c
- .write(self.address, &data)
- .await
- .map_err(Error::I2C)
+ const M: usize = 4 * $num + 1;
+ self.set_chs_on_off::<$num, M>(start, on, off)
  }
  }
  };
@@ -229,8 +215,32 @@ where
  }
 
  set_nchs_on_off!(2);
-
  set_nchs_on_off!(4);
+ set_nchs_on_off!(8);
+
+ async fn set_chs_on_off<const N: usize, const M: usize>(
+ &mut self,
+ start: Channel,
+ on: &[u16; N],
+ off: &[u16; N],
+ ) -> Result<(), Error<E>> {
+ let mut data = [0; M];
+ data[0] = get_register_on(start);
+ for (i, (on, off)) in on.iter().zip(off).enumerate() {
+ if *on > 4095 || *off > 4095 {
+ return Err(Error::InvalidInputData);
+ }
+ data[i * 4 + 1] = *on as u8;
+ data[i * 4 + 2] = (*on >> 8) as u8;
+ data[i * 4 + 3] = *off as u8;
+ data[i * 4 + 4] = (*off >> 8) as u8;
+ }
+ self.enable_auto_increment().await?;
+ self.i2c
+ .write(self.address, &data)
+ .await
+ .map_err(Error::I2C)
+ }
 }
 
 macro_rules! get_register {

src/lib.rs

@@ -11,6 +11,7 @@
 //! - Set the _on_ and _off_ counters for each channel at once. See: [`set_all_on_off()`](Pca9685::set_all_on_off).
 //! - Set the _on_ and _off_ counters for a subset of channels at once. See for example: [`set_first_4_channels_on_off()`](Pca9685::set_first_4_channels_on_off).
 //! - Set the _on_ and _off_ counters **and** the always-on/always-off flags for each channel at once. See: [`set_all_channels()`](Pca9685::set_all_channels).
+//! - Set the _on_ and _off_ counters for a subset of channels at once from an arbitrary starting position.[`set_4chs_on_off()`](Pca9685::set_4chs_on_off).
 //! - Set the prescale value. See: [`set_prescale()`](Pca9685::set_prescale).
 //! - Select the output logic state direct or inverted. See: [`set_output_logic_state()`](Pca9685::set_output_logic_state).
 //! - Set when the outputs change. See: [`set_output_change_behavior()`](Pca9685::set_output_change_behavior).