Device Firmware Upgrade

Functions
void	sd_dfu_start (void)
	Enter Device Firmware Upgrade Mode Prepare device to enter system memory by disabling peripheral clocks, disable PLL, clear pending interrupts and disable interrupts. More...

Detailed Description

Function Documentation

sd_dfu_start()

void sd_dfu_start

(

void

)

#include <Src/sd_platform.c>

Enter Device Firmware Upgrade Mode Prepare device to enter system memory by disabling peripheral clocks, disable PLL, clear pending interrupts and disable interrupts.

Disable peripheral clocks

Disable PLL

Disable systick

Run to stack pointer and execute code from system memory

{
    void (*boot_jump)(void);
    
    __GPIOA_CLK_DISABLE();
    __GPIOB_CLK_DISABLE();
    __GPIOC_CLK_DISABLE();
    __GPIOD_CLK_DISABLE();
    __GPIOE_CLK_DISABLE();
    __GPIOF_CLK_DISABLE();
    
    RCC->CR    |= (uint32_t)0x00000001; /* Set HSION bit */
    RCC->CFGR  &= (uint32_t)0x08FFB80C; /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE, MCOSEL[2:0], MCOPRE[2:0] and PLLNODIV bits */
    RCC->CR    &= (uint32_t)0xFEF6FFFF; /* Reset HSEON, CSSON and PLLON bits */
    RCC->CR    &= (uint32_t)0xFFFBFFFF; /* Reset HSEBYP bit */
    RCC->CFGR  &= (uint32_t)0xFFC0FFFF; /* Reset PLLSRC, PLLXTPRE and PLLMUL[3:0] bits */
    RCC->CFGR2 &= (uint32_t)0xFFFFFFF0; /* Reset PREDIV1[3:0] bits */
    RCC->CFGR3 &= (uint32_t)0xFFF0FEAC; /* Reset USARTSW[1:0], I2CSW, CECSW and ADCSW bits */
    RCC->CR2   &= (uint32_t)0xFFFFFFFE; /* Reset HSI14 bit */
    RCC->CIR    = 0x00000000;       /* Disable all interrupts */
    
    SysTick->CTRL = 0;
    SysTick->LOAD = 0;
    SysTick->VAL = 0;
    
    __set_MSP(BOOT_STACK_ADDR);
    boot_jump = (void (*)(void))(*((uint32_t *)(SYS_MEM_START_ADDR + 4)));
    boot_jump();
    while (1);
}