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dfu: refactor

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This commit is contained in:
topquark12 2021-01-18 16:45:01 +08:00
parent c4e3be1d05
commit f3661ac8e3
1 changed files with 10 additions and 14 deletions
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24
src/dfu.rs
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@ -1,5 +1,7 @@
use cortex_m_rt::{pre_init};
use stm32f4xx_hal::{
stm32::{RCC, SYSCFG},
};
const DFU_TRIG_MSG: u32 = 0xDECAFBAD;
extern "C" {
@ -21,22 +23,16 @@ unsafe fn __pre_init() {
_dfu_msg = 0x00000000;
// Enable system config controller clock
const RCC_APB2ENR: *mut u32 = 0xE000_ED88 as *mut u32;
const RCC_APB2ENR_ENABLE_SYSCFG_CLOCK: u32 = 0x00004000;
core::ptr::write_volatile(
RCC_APB2ENR,
*RCC_APB2ENR | RCC_APB2ENR_ENABLE_SYSCFG_CLOCK,
);
let rcc = &*RCC::ptr();
rcc.apb2enr.modify(|_, w| w.syscfgen().set_bit());
// Bypass BOOT pins and remap bootloader to 0x00000000
const SYSCFG_MEMRMP: *mut u32 = 0x40013800 as *mut u32;
const SYSCFG_MEMRMP_MAP_ROM: u32 = 0x00000001;
let syscfg = &*SYSCFG::ptr() ;
syscfg.memrm.write(|w| w.mem_mode().bits(0b01));
core::ptr::write_volatile(
SYSCFG_MEMRMP,
*SYSCFG_MEMRMP | SYSCFG_MEMRMP_MAP_ROM,
);
// Impose instruction and memory barriers
cortex_m::asm::isb();
cortex_m::asm::dsb();
asm!(
// Set stack pointer to bootloader location