rp2040-hal 0.8.1

A Rust Embeded-HAL impl for the rp2040 microcontroller
Documentation 
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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154

use super::Float;
use crate::rom_data;

// Some of these are also not connected in the Pico SDK.  This is probably
// because the ROM version actually does a fixed point conversion, just with
// the fractional width set to zero.

intrinsics! {
    // Not connected in the Pico SDK
    #[slower_than_default]
    #[aeabi = __aeabi_i2f]
    extern "C" fn __floatsisf(i: i32) -> f32 {
        rom_data::float_funcs::int_to_float(i)
    }

    // Not connected in the Pico SDK
    #[slower_than_default]
    #[aeabi = __aeabi_i2d]
    extern "C" fn __floatsidf(i: i32) -> f64 {
        rom_data::double_funcs::int_to_double(i)
    }

    // Questionable gain
    #[aeabi = __aeabi_l2f]
    extern "C" fn __floatdisf(i: i64) -> f32 {
        rom_data::float_funcs::int64_to_float(i)
    }

    #[bootrom_v2]
    #[aeabi = __aeabi_l2d]
    extern "C" fn __floatdidf(i: i64) -> f64 {
        rom_data::double_funcs::int64_to_double(i)
    }

    // Not connected in the Pico SDK
    #[slower_than_default]
    #[aeabi = __aeabi_ui2f]
    extern "C" fn __floatunsisf(i: u32) -> f32 {
        rom_data::float_funcs::uint_to_float(i)
    }

    // Questionable gain
    #[bootrom_v2]
    #[aeabi = __aeabi_ui2d]
    extern "C" fn __floatunsidf(i: u32) -> f64 {
        rom_data::double_funcs::uint_to_double(i)
    }

    // Questionable gain
    #[bootrom_v2]
    #[aeabi = __aeabi_ul2f]
    extern "C" fn __floatundisf(i: u64) -> f32 {
        rom_data::float_funcs::uint64_to_float(i)
    }

    #[bootrom_v2]
    #[aeabi = __aeabi_ul2d]
    extern "C" fn __floatundidf(i: u64) -> f64 {
        rom_data::double_funcs::uint64_to_double(i)
    }


    // The Pico SDK does some optimization here (e.x. fast paths for zero and
    // one), but we can just directly connect it.
    #[aeabi = __aeabi_f2iz]
    extern "C" fn __fixsfsi(f: f32) -> i32 {
        rom_data::float_funcs::float_to_int(f)
    }

    #[bootrom_v2]
    #[aeabi = __aeabi_f2lz]
    extern "C" fn __fixsfdi(f: f32) -> i64 {
        rom_data::float_funcs::float_to_int64(f)
    }

    // Not connected in the Pico SDK
    #[slower_than_default]
    #[bootrom_v2]
    #[aeabi = __aeabi_d2iz]
    extern "C" fn __fixdfsi(f: f64) -> i32 {
        rom_data::double_funcs::double_to_int(f)
    }

    // Like with the 32 bit version, there's optimization that we just
    // skip.
    #[bootrom_v2]
    #[aeabi = __aeabi_d2lz]
    extern "C" fn __fixdfdi(f: f64) -> i64 {
        rom_data::double_funcs::double_to_int64(f)
    }

    #[slower_than_default]
    #[aeabi = __aeabi_f2uiz]
    extern "C" fn __fixunssfsi(f: f32) -> u32 {
        rom_data::float_funcs::float_to_uint(f)
    }

    #[slower_than_default]
    #[bootrom_v2]
    #[aeabi = __aeabi_f2ulz]
    extern "C" fn __fixunssfdi(f: f32) -> u64 {
        rom_data::float_funcs::float_to_uint64(f)
    }

    #[slower_than_default]
    #[bootrom_v2]
    #[aeabi = __aeabi_d2uiz]
    extern "C" fn __fixunsdfsi(f: f64) -> u32 {
        rom_data::double_funcs::double_to_uint(f)
    }

    #[slower_than_default]
    #[bootrom_v2]
    #[aeabi = __aeabi_d2ulz]
    extern "C" fn __fixunsdfdi(f: f64) -> u64 {
        rom_data::double_funcs::double_to_uint64(f)
    }

    #[bootrom_v2]
    #[alias = __extendsfdf2vfp]
    #[aeabi = __aeabi_f2d]
    extern "C" fn  __extendsfdf2(f: f32) -> f64 {
        if f.is_not_finite() {
            return f64::from_repr(
                // Not finite
                f64::EXPONENT_MASK |
                // Preserve NaN or inf
                ((f.repr() & f32::SIGNIFICAND_MASK) as u64) |
                // Preserve sign
                ((f.repr() & f32::SIGN_MASK) as u64) << (f64::BITS-f32::BITS)
            );
        }
        rom_data::float_funcs::float_to_double(f)
    }

    #[bootrom_v2]
    #[alias = __truncdfsf2vfp]
    #[aeabi = __aeabi_d2f]
    extern "C" fn __truncdfsf2(f: f64) -> f32 {
        if f.is_not_finite() {
            let mut repr: u32 =
                // Not finite
                f32::EXPONENT_MASK |
                // Preserve sign
                ((f.repr() & f64::SIGN_MASK) >> (f64::BITS-f32::BITS)) as u32;
            // Set NaN
            if  (f.repr() & f64::SIGNIFICAND_MASK) != 0 {
                repr |= 1;
            }
            return f32::from_repr(repr);
        }
        rom_data::double_funcs::double_to_float(f)
    }
}