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io_expander: check I2C (n)ack on write

This commit is contained in:
occheung 2024-09-06 16:25:55 +08:00
parent 3fdb7e80a8
commit f5d8ee3fef
1 changed files with 9 additions and 3 deletions
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12
src/libboard_artiq/src/io_expander.rs
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@ -111,9 +111,15 @@ impl IoExpander {
fn write(&self, i2c: &mut i2c::I2c, addr: u8, value: u8) -> Result<(), &'static str> {
i2c.start()?;
i2c.write(self.address)?;
i2c.write(addr)?;
i2c.write(value)?;
if !i2c.write(self.address)? {
return Err("io expander failed to ack control byte (read)");
}
if !i2c.write(addr)? {
return Err("io expander failed to ack register address");
}
if !i2c.write(value)? {
return Err("io expander failed to ack value");
}
i2c.stop()?;
Ok(())
}