mirror of https://github.com/m-labs/artiq.git
66 lines
1.8 KiB
Rust
66 lines
1.8 KiB
Rust
use i2c;
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use pca9548;
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#[cfg(soc_platform = "kasli")]
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const I2C_SWITCH0: u8 = 0x70;
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#[cfg(soc_platform = "kasli")]
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const I2C_SWITCH1: u8 = 0x71;
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/// [Hardware manual](http://ww1.microchip.com/downloads/en/DeviceDoc/24AA02E48-24AA025E48-24AA02E64-24AA025E64-Data-Sheet-20002124H.pdf)
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pub struct EEPROM {
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busno: u8,
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port: u8,
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address: u8,
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}
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impl EEPROM {
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pub fn kasli_eeprom() -> Self {
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EEPROM {
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busno: 0,
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/// Same port as Si5324
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port: 11,
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address: 0xa0,
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}
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}
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fn select(&self) -> Result<(), &'static str> {
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let mask: u16 = 1 << self.port;
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pca9548::select(self.busno, I2C_SWITCH0, mask as u8)?;
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pca9548::select(self.busno, I2C_SWITCH1, (mask >> 8) as u8)
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}
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pub fn read<'a>(&self, addr: u8, buf: &'a mut [u8]) -> Result<(), &'static str> {
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self.select()?;
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Ok(()).and_then(|()| {
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i2c::start(self.busno)?;
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i2c::write(self.busno, self.address)?;
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i2c::write(self.busno, addr)?;
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Ok(())
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}).map_err(|()| "I2C address write error")?;
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Ok(()).and_then(|()| {
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i2c::restart(self.busno)?;
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i2c::write(self.busno, self.address | 1)?;
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let buf_len = buf.len();
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for (i, byte) in buf.iter_mut().enumerate() {
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*byte = i2c::read(self.busno, i < buf_len - 1)?;
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}
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i2c::stop(self.busno)?;
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Ok(())
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}).map_err(|()| "I2C read error")?;
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Ok(())
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}
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/// > The 24AA02XEXX is programmed at the factory with a
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/// > globally unique node address stored in the upper half
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/// > of the array and permanently write-protected.
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pub fn read_eui48<'a>(&self) -> Result<[u8; 6], &'static str> {
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let mut buffer = [0u8; 6];
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self.read(0xFA, &mut buffer)?;
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Ok(buffer)
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}
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}
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