91 lines
2.4 KiB
Rust
91 lines
2.4 KiB
Rust
use libboard_zynq;
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use crate::artiq_raise;
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pub static mut I2C_BUS: Option<libboard_zynq::i2c::I2c> = None;
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pub extern fn start(busno: i32) {
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if busno > 0 {
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artiq_raise!("I2CError", "I2C bus could not be accessed");
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}
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unsafe {
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if (&mut I2C_BUS).as_mut().unwrap().start().is_err() {
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artiq_raise!("I2CError", "I2C start failed");
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}
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}
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}
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pub extern fn restart(busno: i32) {
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if busno > 0 {
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artiq_raise!("I2CError", "I2C bus could not be accessed");
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}
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unsafe {
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if (&mut I2C_BUS).as_mut().unwrap().restart().is_err() {
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artiq_raise!("I2CError", "I2C restart failed");
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}
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}
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}
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pub extern fn stop(busno: i32) {
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if busno > 0 {
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artiq_raise!("I2CError", "I2C bus could not be accessed");
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}
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unsafe {
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if (&mut I2C_BUS).as_mut().unwrap().stop().is_err() {
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artiq_raise!("I2CError", "I2C stop failed");
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}
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}
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}
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pub extern fn write(busno: i32, data: i32) -> bool {
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if busno > 0 {
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artiq_raise!("I2CError", "I2C bus could not be accessed");
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}
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unsafe {
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match (&mut I2C_BUS).as_mut().unwrap().write(data as u8) {
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Ok(r) => r,
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Err(_) => artiq_raise!("I2CError", "I2C write failed"),
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}
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}
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}
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pub extern fn read(busno: i32, ack: bool) -> i32 {
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if busno > 0 {
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artiq_raise!("I2CError", "I2C bus could not be accessed");
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}
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unsafe {
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match (&mut I2C_BUS).as_mut().unwrap().read(ack) {
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Ok(r) => r as i32,
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Err(_) => artiq_raise!("I2CError", "I2C read failed"),
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}
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}
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}
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pub extern fn switch_select(busno: i32, address: i32, mask: i32) {
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if busno > 0 {
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artiq_raise!("I2CError", "I2C bus could not be accessed");
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}
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let ch = match mask { //decode from mainline, PCA9548-centric API
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0x00 => None,
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0x01 => Some(0),
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0x02 => Some(1),
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0x04 => Some(2),
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0x08 => Some(3),
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0x10 => Some(4),
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0x20 => Some(5),
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0x40 => Some(6),
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0x80 => Some(7),
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_ => artiq_raise!("I2CError", "switch select supports only one channel")
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};
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unsafe {
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if (&mut I2C_BUS).as_mut().unwrap().pca954x_select(address as u8, ch).is_err() {
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artiq_raise!("I2CError", "switch select failed");
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}
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}
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}
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pub fn init() {
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let mut i2c = libboard_zynq::i2c::I2c::i2c0();
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i2c.init().expect("I2C bus initialization failed");
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unsafe { I2C_BUS = Some(i2c) };
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}
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