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bitmask_macro: separated from cfg_reg

pull/4/head
occheung 2020-08-13 16:51:08 +08:00
parent 31b84bc12d
commit 495bf21575
3 changed files with 59 additions and 53 deletions
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55
src/bitmask_macro.rs Normal file
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@ -0,0 +1,55 @@
/*
* Macro builder for bit masks
* $collection: Name for the bit mask collection
* $unsigned_type: Unsigned type for the data that the bit mask will be applied onto
* ($name: name of a bit mask, $shift: shift of the bit field, $width: no. of bits in the bit field)
* Note: All bit masks must concern a set of contiguous bits
*/
macro_rules! construct_bitmask {
($collection: ident; $unsigned_type: ty; $($name: ident, $shift: expr, $width: expr),+) => {
#[derive(Debug, Copy, Clone)]
pub enum $collection {
$(
$name,
)*
}
impl $collection {
pub(crate) fn get_width(self) -> u8 {
match self {
$(
$collection::$name => $width,
)*
}
}
pub(crate) fn get_shift(self) -> u8 {
match self {
$(
$collection::$name => $shift,
)*
}
}
pub(crate) fn get_bitmask(self) -> $unsigned_type {
let mut mask: $unsigned_type = 0;
for bit in 0..self.get_width() {
mask |= (1 << (self.get_shift() + bit));
}
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 then shift bits
((data & self.get_bitmask()) >> self.get_shift())
}
}
}
}

53
src/config_register.rs
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@ -2,59 +2,6 @@ use embedded_hal::blocking::spi::Transfer;
use cortex_m_semihosting::hprintln;
use crate::Error;
/*
* Macro builder for bit masks
* Assumption: Contiguous bit field
* Break the bit field up when invoking macro rule if needed
*/
macro_rules! construct_bitmask {
($collection: ident; $unsigned_type: ty; $($name: ident, $shift: expr, $width: expr),+) => {
#[derive(Debug, Copy, Clone)]
pub enum $collection {
$(
$name,
)*
}
impl $collection {
pub(crate) fn get_width(self) -> u8 {
match self {
$(
$collection::$name => $width,
)*
}
}
pub(crate) fn get_shift(self) -> u8 {
match self {
$(
$collection::$name => $shift,
)*
}
}
pub(crate) fn get_bitmask(self) -> $unsigned_type {
let mut mask: $unsigned_type = 0;
for bit in 0..self.get_width() {
mask |= (1 << (self.get_shift() + bit));
}
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
construct_bitmask!(CFGMask; u32;
RF_SW, 0, 4,

4
src/lib.rs
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@ -11,12 +11,16 @@ use cortex_m;
use cortex_m::asm::nop;
use cortex_m_semihosting::hprintln;
#[macro_use]
pub mod bitmask_macro;
pub mod spi_slave;
use crate::spi_slave::Parts;
pub mod config_register;
pub mod attenuator;
/*
* Enum for structuring error
*/