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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
use defmt::*;
use embassy::executor::Spawner;
use embassy::time::{Delay, Duration, Timer};
use embassy_stm32::fmc::Fmc;
use embassy_stm32::time::mhz;
use embassy_stm32::{Config, Peripherals};
use {defmt_rtt as _, panic_probe as _};
pub fn config() -> Config {
let mut config = Config::default();
config.rcc.sys_ck = Some(mhz(400));
config.rcc.hclk = Some(mhz(200));
config.rcc.pll1.q_ck = Some(mhz(100));
config
}
#[embassy::main(config = "config()")]
async fn main(_spawner: Spawner, p: Peripherals) {
info!("Hello World!");
let mut core_peri = cortex_m::Peripherals::take().unwrap();
// taken from stm32h7xx-hal
core_peri.SCB.enable_icache();
// See Errata Sheet 2.2.1
// core_peri.SCB.enable_dcache(&mut core_peri.CPUID);
core_peri.DWT.enable_cycle_counter();
// ----------------------------------------------------------
// Configure MPU for external SDRAM
// MPU config for SDRAM write-through
let sdram_size = 32 * 1024 * 1024;
{
let mpu = core_peri.MPU;
let scb = &mut core_peri.SCB;
let size = sdram_size;
// Refer to ARM®v7-M Architecture Reference Manual ARM DDI 0403
// Version E.b Section B3.5
const MEMFAULTENA: u32 = 1 << 16;
unsafe {
/* Make sure outstanding transfers are done */
cortex_m::asm::dmb();
scb.shcsr.modify(|r| r & !MEMFAULTENA);
/* Disable the MPU and clear the control register*/
mpu.ctrl.write(0);
}
const REGION_NUMBER0: u32 = 0x00;
const REGION_BASE_ADDRESS: u32 = 0xD000_0000;
const REGION_FULL_ACCESS: u32 = 0x03;
const REGION_CACHEABLE: u32 = 0x01;
const REGION_WRITE_BACK: u32 = 0x01;
const REGION_ENABLE: u32 = 0x01;
crate::assert_eq!(size & (size - 1), 0, "SDRAM memory region size must be a power of 2");
crate::assert_eq!(size & 0x1F, 0, "SDRAM memory region size must be 32 bytes or more");
fn log2minus1(sz: u32) -> u32 {
for i in 5..=31 {
if sz == (1 << i) {
return i - 1;
}
}
crate::panic!("Unknown SDRAM memory region size!");
}
//info!("SDRAM Memory Size 0x{:x}", log2minus1(size as u32));
// Configure region 0
//
// Cacheable, outer and inner write-back, no write allocate. So
// reads are cached, but writes always write all the way to SDRAM
unsafe {
mpu.rnr.write(REGION_NUMBER0);
mpu.rbar.write(REGION_BASE_ADDRESS);
mpu.rasr.write(
(REGION_FULL_ACCESS << 24)
| (REGION_CACHEABLE << 17)
| (REGION_WRITE_BACK << 16)
| (log2minus1(size as u32) << 1)
| REGION_ENABLE,
);
}
const MPU_ENABLE: u32 = 0x01;
const MPU_DEFAULT_MMAP_FOR_PRIVILEGED: u32 = 0x04;
// Enable
unsafe {
mpu.ctrl.modify(|r| r | MPU_DEFAULT_MMAP_FOR_PRIVILEGED | MPU_ENABLE);
scb.shcsr.modify(|r| r | MEMFAULTENA);
// Ensure MPU settings take effect
cortex_m::asm::dsb();
cortex_m::asm::isb();
}
}
let mut sdram = Fmc::sdram_a12bits_d32bits_4banks_bank2(
p.FMC,
// A0-A11
p.PF0,
p.PF1,
p.PF2,
p.PF3,
p.PF4,
p.PF5,
p.PF12,
p.PF13,
p.PF14,
p.PF15,
p.PG0,
p.PG1,
// BA0-BA1
p.PG4,
p.PG5,
// D0-D31
p.PD14,
p.PD15,
p.PD0,
p.PD1,
p.PE7,
p.PE8,
p.PE9,
p.PE10,
p.PE11,
p.PE12,
p.PE13,
p.PE14,
p.PE15,
p.PD8,
p.PD9,
p.PD10,
p.PH8,
p.PH9,
p.PH10,
p.PH11,
p.PH12,
p.PH13,
p.PH14,
p.PH15,
p.PI0,
p.PI1,
p.PI2,
p.PI3,
p.PI6,
p.PI7,
p.PI9,
p.PI10,
// NBL0 - NBL3
p.PE0,
p.PE1,
p.PI4,
p.PI5,
p.PH7, // SDCKE1
p.PG8, // SDCLK
p.PG15, // SDNCAS
p.PH6, // SDNE1 (!CS)
p.PF11, // SDRAS
p.PC0, // SDNWE, change to p.PH5 for EVAL boards
stm32_fmc::devices::is42s32800g_6::Is42s32800g {},
);
let mut delay = Delay;
let ram_slice = unsafe {
// Initialise controller and SDRAM
let ram_ptr: *mut u32 = sdram.init(&mut delay) as *mut _;
// Convert raw pointer to slice
core::slice::from_raw_parts_mut(ram_ptr, sdram_size / core::mem::size_of::<u32>())
};
// // ----------------------------------------------------------
// // Use memory in SDRAM
info!("RAM contents before writing: {:x}", ram_slice[..10]);
ram_slice[0] = 1;
ram_slice[1] = 2;
ram_slice[2] = 3;
ram_slice[3] = 4;
info!("RAM contents after writing: {:x}", ram_slice[..10]);
crate::assert_eq!(ram_slice[0], 1);
crate::assert_eq!(ram_slice[1], 2);
crate::assert_eq!(ram_slice[2], 3);
crate::assert_eq!(ram_slice[3], 4);
info!("Assertions succeeded.");
loop {
Timer::after(Duration::from_millis(1000)).await;
}
}
|
