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firmware: minor cleanup in board::si5324.

This commit is contained in:
whitequark 2017-01-30 07:28:45 +00:00
parent 9800acea92
commit 3a19a9fb77
1 changed files with 10 additions and 7 deletions
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17
artiq/firmware/libboard/si5324.rs
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@ -1,11 +1,14 @@
use core::result;
use i2c;
use clock;
type Result<T> = result::Result<T, &'static str>;
const BUSNO: u8 = 0;
const ADDRESS: u8 = 0x68;
#[cfg(soc_platform = "kc705")]
fn pca9548_select(channel: u8) -> Result<(), &'static str> {
fn pca9548_select(channel: u8) -> Result<()> {
i2c::start(BUSNO);
if !i2c::write(BUSNO, (0x74 << 1)) {
return Err("PCA9548 failed to ack write address")
@ -30,7 +33,7 @@ pub struct FrequencySettings {
n32: u32
}
fn map_frequency_settings(settings: &FrequencySettings) -> Result<FrequencySettings, &'static str> {
fn map_frequency_settings(settings: &FrequencySettings) -> Result<FrequencySettings> {
if settings.nc1_ls != 0 && (settings.nc1_ls % 2) == 1 {
return Err("NC1_LS must be 0 or even")
}
@ -80,7 +83,7 @@ fn map_frequency_settings(settings: &FrequencySettings) -> Result<FrequencySetti
Ok(r)
}
fn write(reg: u8, val: u8) -> Result<(), &'static str> {
fn write(reg: u8, val: u8) -> Result<()> {
i2c::start(BUSNO);
if !i2c::write(BUSNO, (ADDRESS << 1)) {
return Err("Si5324 failed to ack write address")
@ -95,7 +98,7 @@ fn write(reg: u8, val: u8) -> Result<(), &'static str> {
Ok(())
}
fn read(reg: u8) -> Result<u8, &'static str> {
fn read(reg: u8) -> Result<u8> {
i2c::start(BUSNO);
if !i2c::write(BUSNO, (ADDRESS << 1)) {
return Err("Si5324 failed to ack write address")
@ -112,15 +115,15 @@ fn read(reg: u8) -> Result<u8, &'static str> {
Ok(val)
}
fn ident() -> Result<u16, &'static str> {
fn ident() -> Result<u16> {
Ok(((read(134)? as u16) << 8) | (read(135)? as u16))
}
fn locked() -> Result<bool, &'static str> {
fn locked() -> Result<bool> {
Ok((read(130)? & 0x01) == 0) // LOL_INT=1
}
pub fn setup_hitless_clock_switching(settings: &FrequencySettings) -> Result<(), &'static str> {
pub fn setup_hitless_clock_switching(settings: &FrequencySettings) -> Result<()> {
let s = map_frequency_settings(settings)?;
#[cfg(soc_platform = "kc705")]