1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
//! Working with resources in a generic fashion
#![deny(unsafe_code)]
#![deny(warnings)]
#![feature(proc_macro)]
#![no_std]
extern crate cortex_m_rtfm as rtfm;
extern crate stm32f103xx;
use rtfm::{app, Resource, Threshold};
use stm32f103xx::{SPI1, GPIOA};
app! {
device: stm32f103xx,
resources: {
static GPIOA: GPIOA;
static SPI1: SPI1;
},
tasks: {
EXTI0: {
path: exti0,
priority: 1,
resources: [GPIOA, SPI1],
},
EXTI1: {
path: exti1,
priority: 2,
resources: [GPIOA, SPI1],
},
},
}
fn init(p: init::Peripherals) -> init::LateResources {
init::LateResources {
GPIOA: p.device.GPIOA,
SPI1: p.device.SPI1,
}
}
fn idle() -> ! {
loop {
rtfm::wfi();
}
}
// A generic function that uses some resources
fn work<G, S>(t: &mut Threshold, gpioa: &G, spi1: &S)
where
G: Resource<Data = GPIOA>,
S: Resource<Data = SPI1>,
{
gpioa.claim(t, |_gpioa, t| {
// drive NSS low
spi1.claim(t, |_spi1, _| {
// transfer data
});
// drive NSS high
});
}
// This task needs critical sections to access the resources
fn exti0(t: &mut Threshold, r: EXTI0::Resources) {
work(t, &r.GPIOA, &r.SPI1);
}
// This task has direct access to the resources
fn exti1(t: &mut Threshold, r: EXTI1::Resources) {
work(t, &r.GPIOA, &r.SPI1);
}
|
