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pca954x_select: api supports no channel enabled

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This commit is contained in:
mwojcik 2022-02-11 13:46:51 +08:00
parent 26ab2927b9
commit 3e95df1f64
2 changed files with 16 additions and 5 deletions
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4
libboard_zynq/src/i2c/eeprom.rs
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@ -35,14 +35,14 @@ impl<'a> EEPROM<'a> {
#[cfg(feature = "target_zc706")]
fn select(&mut self) -> Result<(), &'static str> {
self.i2c.pca954x_select(0b1110100, self.port)?;
self.i2c.pca954x_select(0b1110100, Some(self.port))?;
Ok(())
}
#[cfg(feature = "target_kasli_soc")]
fn select(&mut self) -> Result<(), &'static str> {
// tca9548 is compatible with pca9548
self.i2c.pca954x_select(0b1110001, self.port)?;
self.i2c.pca954x_select(0b1110001, Some(self.port))?;
Ok(())
}

17
libboard_zynq/src/i2c/mod.rs
View File

@ -301,14 +301,25 @@ impl I2c {
Ok(data)
}
pub fn pca954x_select(&mut self, address: u8, channel: u8) -> Result<(), &'static str> {
pub fn pca954x_select(&mut self, address: u8, channel: Option<u8>) -> Result<(), &'static str> {
self.start()?;
// PCA9547 supports only one channel at a time
// for compatibility, PCA9548 is treated as such too
// channel - Some(x) - # of the channel [0,7], or None for all disabled
let setting = match self.pca_type {
I2cMultiplexer::PCA9548 => 1 << channel,
I2cMultiplexer::PCA9548 => {
match channel {
Some(ch) => 1 << ch,
None => 0,
}
},
#[cfg(feature = "target_kasli_soc")]
I2cMultiplexer::PCA9547 => channel | 0x08,
I2cMultiplexer::PCA9547 => {
match channel {
Some(ch) => ch | 0x08,
None => 0,
}
}
};
if !self.write(address << 1)? {