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Add rust binary for communication with clock chip
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // SPDX-FileCopyrightText: 2022 Google LLC | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| use ufmt::derive::uDebug; | ||
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| use crate::i2c::{I2CError, I2C}; | ||
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| #[derive(uDebug)] | ||
| pub struct SI534X { | ||
| i2c: I2C, | ||
| slave_addr: u8, | ||
| page: Option<u8>, | ||
| addr: Option<u8>, | ||
| } | ||
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| impl SI534X { | ||
| /// Create a new [`SI534X`] instance given a base address and the slave | ||
| /// address of the SI534X chip. | ||
| /// | ||
| /// # Safety | ||
| /// | ||
| /// The `base_addr` pointer MUST BE a valid pointer that is backed | ||
| /// by either a memory mapped UART instance or at valid read-writable memory | ||
| /// (which will likely cause incorrect behaviour, but not break memory safety) | ||
| pub unsafe fn new(base_addr: *mut u8, slave_addr: u8) -> SI534X { | ||
| let mut si = SI534X { | ||
| i2c: I2C::new(base_addr), | ||
| slave_addr, | ||
| page: None, | ||
| addr: None, | ||
| }; | ||
| si.i2c.init(); | ||
| si | ||
| } | ||
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| pub fn read_byte(&mut self, page: u8, addr: u8) -> Result<u8, I2CError> { | ||
| self.set_page(page)?; | ||
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| self.i2c.claim_bus()?; | ||
| self.i2c.write_byte(self.slave_addr << 1)?; | ||
| self.addr = Some(addr); | ||
| self.i2c.release_bus(); | ||
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| self.i2c.claim_bus()?; | ||
| self.i2c.write_byte((self.slave_addr << 1) | 1)?; | ||
| let data = self.i2c.read_byte()?; | ||
| self.i2c.release_bus(); | ||
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| Ok(data) | ||
| } | ||
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| pub fn write_byte(&mut self, page: u8, addr: u8, data: u8) -> Result<(), I2CError> { | ||
| self.set_page(page)?; | ||
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| self.i2c.claim_bus()?; | ||
| self.i2c.write_byte(self.slave_addr << 1)?; | ||
| self.i2c.write_byte(addr)?; | ||
| self.addr = Some(addr); | ||
| self.i2c.write_byte(data)?; | ||
| self.i2c.release_bus(); | ||
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| Ok(()) | ||
| } | ||
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| fn set_page(&mut self, page: u8) -> Result<(), I2CError> { | ||
| if self.page != Some(page) { | ||
| self.i2c.claim_bus()?; | ||
| self.i2c.write_byte(self.slave_addr << 1)?; | ||
| self.i2c.write_byte(0x01)?; | ||
| self.i2c.write_byte(page)?; | ||
| self.page = Some(page); | ||
| self.i2c.release_bus(); | ||
| } | ||
| Ok(()) | ||
| } | ||
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| pub fn get_clock_divider(&mut self) -> u16 { | ||
| self.i2c.get_clock_divider() | ||
| } | ||
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| pub fn set_clock_divider(&mut self, clk_div: u16) { | ||
| self.i2c.set_clock_divider(clk_div) | ||
| } | ||
| } |