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cfg_reg: mv bitmask operation to macro

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occheung 2020-08-13 16:31:27 +08:00
parent cbe36e336d
commit 31b84bc12d
1 changed files with 25 additions and 22 deletions
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47
src/config_register.rs
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@ -4,9 +4,11 @@ use crate::Error;
/* /*
* Macro builder for bit masks * Macro builder for bit masks
* Assumption: Contiguous bit field
* Break the bit field up when invoking macro rule if needed
*/ */
macro_rules! construct_bitmask { macro_rules! construct_bitmask {
($collection: ident; $($name: ident, $shift: expr, $width: expr),+) => { ($collection: ident; $unsigned_type: ty; $($name: ident, $shift: expr, $width: expr),+) => {
#[derive(Debug, Copy, Clone)] #[derive(Debug, Copy, Clone)]
pub enum $collection { pub enum $collection {
$( $(
@ -29,25 +31,32 @@ macro_rules! construct_bitmask {
)* )*
} }
} }
pub(crate) fn get_bitmask(self) -> u32 { pub(crate) fn get_bitmask(self) -> $unsigned_type {
match self { let mut mask: $unsigned_type = 0;
$( for bit in 0..self.get_width() {
$collection::$name => { mask |= (1 << (self.get_shift() + bit));
let mut mask: u32 = 0;
for bit in 0..$width {
mask |= (1 << ($shift + bit));
}
mask
},
)*
} }
mask
}
pub(crate) fn get_shifted_bits(self, arg: $unsigned_type) -> $unsigned_type {
assert!(arg < (2 << self.get_width()));
(arg << self.get_shift())
}
pub(crate) fn set_data_by_arg(self, data: &mut $unsigned_type, arg: $unsigned_type) {
// Clear bits in field, then insert shifted argument
*data &= (!self.get_bitmask());
*data |= self.get_shifted_bits(arg);
}
pub(crate) fn get_filtered_content(self, data: $unsigned_type) -> $unsigned_type {
// Filter everything
((data & self.get_bitmask()) >> self.get_shift())
} }
} }
} }
} }
// Bitmasks for CFG // Bitmasks for CFG
construct_bitmask!(CFGMask; construct_bitmask!(CFGMask; u32;
RF_SW, 0, 4, RF_SW, 0, 4,
LED, 4, 4, LED, 4, 4,
PROFILE, 8, 3, PROFILE, 8, 3,
@ -62,7 +71,7 @@ construct_bitmask!(CFGMask;
); );
// BitMasks for CFG read // BitMasks for CFG read
construct_bitmask!(StatusMask; construct_bitmask!(StatusMask; u32;
RF_SW, 0, 4, RF_SW, 0, 4,
SMP_ERR, 4, 4, SMP_ERR, 4, 4,
PLL_LOCK, 8, 4, PLL_LOCK, 8, 4,
@ -111,13 +120,7 @@ where
*/ */
pub fn set_configurations(&mut self, configs: &mut[(CFGMask, u32)]) -> Result<u32, Error<E>> { pub fn set_configurations(&mut self, configs: &mut[(CFGMask, u32)]) -> Result<u32, Error<E>> {
for config in configs.into_iter() { for config in configs.into_iter() {
// Erase the bits in the configuration region config.0.set_data_by_arg(&mut self.data, config.1)
self.data &= (!config.0.get_bitmask());
// Check validity of config data
let shifted_config: u32 = config.1 << config.0.get_shift();
assert_eq!(shifted_config | config.0.get_bitmask(), config.0.get_bitmask());
// Write the configuration onto local data
self.data |= shifted_config;
} }
// Write all configurations at the same time // Write all configurations at the same time
self.set_all_configurations() self.set_all_configurations()
@ -127,7 +130,7 @@ where
* Return selected configuration field * Return selected configuration field
*/ */
pub fn get_configuration(&mut self, config_type: CFGMask) -> u8 { pub fn get_configuration(&mut self, config_type: CFGMask) -> u8 {
((self.data & config_type.get_bitmask()) >> config_type.get_shift()) as u8 (config_type.get_filtered_content(self.data) as u8)
} }
/* /*