hi,
We're using the STM32F7 in our project and would like to flash over USB. In the host application we use USB for data transfer which works well. Unfortunately, I have had no success getting the device into the bootloader as we have no access to the boot pins. I tried this code I found on the internet but the the linux dfu-util -l command says no dfu devices found. I noticed this command takes a long time, same with lsusb when the board is in the bootloader (if it even is). Maybe the USB enumeration ist working properly?
We use a 32 MHz HSE but that doesn't get initialized until after the bootloader is called. Any idea on what could be wrong?
Any help would be greatly appreciated!
best regards,
dominik
void JumpToBootloader(void) {
void (*SysMemBootJump)(void);
// read out if we want to enter the bootloader from the backup registers
RTC_HandleTypeDef RtcHandle;
RtcHandle.Instance = RTC;
uint32_t callBootloader = HAL_RTCEx_BKUPRead(&RtcHandle, RTC_BKP_DR0);
HAL_RTCEx_BKUPWrite(&RtcHandle,RTC_BKP_DR0,0x1);
if(!callBootloader)
{
return;
}
/**
* Step: Set system memory address.
*
* For other families, check AN2606 document table 110 with descriptions of memory addresses
*/
volatile uint32_t addr = 0x1FF00000;
/**
* Step: Disable RCC, set it to default (after reset) settings
* Internal clock, no PLL, etc.
*/
HAL_RCC_DeInit();
/**
* Step: Disable systick timer and reset it to default values
*/
SysTick->CTRL = 0;
SysTick->LOAD = 0;
SysTick->VAL = 0;
/**
* Step: Disable all interrupts
*/
__disable_irq();
/**
* Step: Remap system memory to address 0x0000 0000 in address space
* For each family registers may be different.
* Check reference manual for each family.
*
* For STM32F4xx, MEMRMP register in SYSCFG is used (bits[1:0])
* For STM32F0xx, CFGR1 register in SYSCFG is used (bits[1:0])
* For others, check family reference manual
*/
SYSCFG->MEMRMP = 0x01;
/**
* Step: Set jump memory location for system memory
* Use address with 4 bytes offset which specifies jump location where program starts
*/
SysMemBootJump = (void (*)(void)) (*((uint32_t *)(addr + 4)));
/**
* Step: Set main stack pointer.
* This step must be done last otherwise local variables in this function
* don't have proper value since stack pointer is located on different position
*
* Set direct address location which specifies stack pointer in SRAM location
*/
__set_MSP(*(uint32_t *)addr);
/**
* Step: Actually call our function to jump to set location
* This will start system memory execution
*/
SysMemBootJump();
/**
* Step: Connect USB<->UART converter to dedicated USART pins and test
* and test with bootloader works with STM32 Flash Loader Demonstrator software
*/
}
