hal_mik32/constants.rs
1//! Common system constants for MIK32
2//!
3//! This module contains system-wide constants including clock frequencies,
4//! dividers, and communication parameters.
5
6// ============================================================================
7// System Clock Configuration
8// ============================================================================
9
10/// MIK32 system clock frequency (OSC32M - External 32 MHz oscillator)
11pub const SYS_CLOCK_FREQ: u32 = 32_000_000;
12
13/// External 32 MHz oscillator value (OSC32M)
14pub const OSC_SYSTEM_VALUE: u32 = 32_000_000;
15
16/// Internal 32 MHz oscillator value (HSI32M)
17pub const HSI_VALUE: u32 = 32_000_000;
18
19/// External 32.768 kHz oscillator value (OSC32K)
20pub const OSC_CLOCK_VALUE: u32 = 32_768;
21
22/// Internal 32.768 kHz oscillator value (LSI32K)
23pub const LSI_VALUE: u32 = 32_768;
24
25/// AHB bus divider (0 = divide by 1)
26pub const DIV_AHB: u32 = 0;
27
28/// APB_P bus divider (0 = divide by 1)
29pub const DIV_APB_P: u32 = 0;
30
31/// APB_M bus divider (0 = divide by 1)
32pub const DIV_APB_M: u32 = 0;
33
34/// Effective clock frequency for peripherals on APB_P bus
35/// Formula: SYS_CLOCK_FREQ / (DIV_AHB + 1) / (DIV_APB_P + 1)
36pub const APB_P_CLOCK_FREQ: u32 = SYS_CLOCK_FREQ / (DIV_AHB + 1) / (DIV_APB_P + 1);
37
38// ============================================================================
39// USART Configuration
40// ============================================================================
41
42/// Standard USART baudrate (bits per second)
43pub const USART_BAUDRATE: u32 = 115_200;
44
45/// USART baudrate divisor (BRR) for 115200 baud
46/// Formula: APB_P_CLOCK_FREQ / USART_BAUDRATE
47pub const USART_BRR: u32 = APB_P_CLOCK_FREQ / USART_BAUDRATE;
48
49// ============================================================================
50// DMA Configuration
51// ============================================================================
52
53/// DMA channel 1 for USART1 TX transfers
54pub const DMA_CHANNEL_USART1_TX: u32 = 1;
55
56// ============================================================================
57// GPIO Configuration
58// ============================================================================
59
60/// LED pin on GPIO0
61pub const PIN_LED: u32 = 9; // PORT 0.9