Created
July 11, 2022 23:46
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| use core::mem::MaybeUninit; | |
| use rtt_target::{rtt::{RttHeader, RttChannel}, set_print_channel, ChannelMode, UpChannel}; | |
| const UP_CHANNELS: usize = 1; | |
| const DOWN_CHANNELS: usize = 0; | |
| const TERMINAL_CHANNEL_SIZE: usize = 512; | |
| #[repr(C)] | |
| pub struct RttControlBlock { | |
| header: RttHeader, | |
| up_channels: [RttChannel; UP_CHANNELS], | |
| down_channels: [RttChannel; DOWN_CHANNELS], | |
| } | |
| #[used] | |
| #[no_mangle] | |
| #[link_section = ".rtt_block"] | |
| #[export_name = "_SEGGER_RTT"] | |
| pub static mut CONTROL_BLOCK: MaybeUninit<RttControlBlock> = MaybeUninit::uninit(); | |
| #[link_section = ".rtt_block"] | |
| static mut TERMINAL_CHANNEL: MaybeUninit<[u8; TERMINAL_CHANNEL_SIZE]> = MaybeUninit::uninit(); | |
| pub fn init_rtt() { | |
| unsafe { | |
| let id = core::slice::from_raw_parts(CONTROL_BLOCK.as_mut_ptr() as *mut u8, 16); | |
| let cb = &mut *CONTROL_BLOCK.as_mut_ptr(); | |
| // Only initialize if not initialized | |
| if id != b"SEGGER RTT\0\0\0\0\0\0" { | |
| core::ptr::write_bytes(CONTROL_BLOCK.as_mut_ptr(), 0, core::mem::size_of::<RttControlBlock>()); | |
| cb.up_channels[0].init("Terminal\0".as_bytes().as_ptr(), ChannelMode::NoBlockSkip, TERMINAL_CHANNEL.as_mut_ptr()); | |
| cb.header.init(cb.up_channels.len(), cb.down_channels.len()); | |
| } | |
| let terminal_channel = UpChannel::new(&mut cb.up_channels[0]); | |
| set_print_channel(terminal_channel); | |
| } | |
| } |
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