stm32f4xx/chip_specific/
clock_constants.rs

1// Licensed under the Apache License, Version 2.0 or the MIT License.
2// SPDX-License-Identifier: Apache-2.0 OR MIT
3// Copyright OxidOS Automotive SRL.
4//
5// Author: Ioan-Cristian CÎRSTEA <ioan.cirstea@oxidos.io>
6
7//! Clock-related constants for a particular chip
8
9/// PLL-related constants for specific for a specific chip
10pub trait PllConstants {
11    /// PLL minimum frequency in MHz
12    const MIN_FREQ_MHZ: usize;
13    /// PLL maximum frequency in MHz
14    // All boards support PLL frequencies up to 216MHz
15    const MAX_FREQ_MHZ: usize = 216;
16}
17
18/// Generic clock constants for a specific chip
19pub trait SystemClockConstants {
20    /// Maximum allowed APB1 frequency in MHz
21    const APB1_FREQUENCY_LIMIT_MHZ: usize;
22    /// Maximum allowed APB2 frequency in MHz
23    // APB2 frequency limit is twice the APB1 frequency limit
24    const APB2_FREQUENCY_LIMIT_MHZ: usize = Self::APB1_FREQUENCY_LIMIT_MHZ << 1;
25    /// Maximum allowed system clock frequency in MHz
26    const SYS_CLOCK_FREQUENCY_LIMIT_MHZ: usize;
27}
28
29/// Clock constants for a specific chip
30pub trait ClockConstants: SystemClockConstants + PllConstants {}
31
32impl<T: SystemClockConstants + PllConstants> ClockConstants for T {}
stm32f4xx/chip_specific/clock_constants.rs

stm32f4xx/chip_specific/
clock_constants.rs
