Posted on January 22, 2015 at 09:46
Can`t start the STM32F407VG chip in bootloader mode via USB. On the Discovery board all works fine if i set the boot0 and boot1 pins to boot from system memory. The device is enumerated in Windows as STM Device in DFU mode.
On our custom board with the same chip, same external crystal (8MHz), and mainly same USB schematics (excluding EMI filter), after setting boot0 and boot1 pins to boot from system memory, the device fails to enumerate and is detected as Unknown device. (But the USB HID class in our software works fine).
Tried to jump to bootloader using following function, invoked after reset and system initialization:
void
BootLoader(
void
)
{
void
(*SysMemBootJump)(
void
) = (
void
(*)(
void
)) (*((uint32_t *) 0x1FFF0004));
__set_PRIMASK(1);
RCC_DeInit();
SysTick->CTRL = 0;
SysTick->LOAD = 0;
SysTick->VAL = 0;
//RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);
__set_MSP(0x20001000);
SysMemBootJump();
}
after that our device and Discovery board fails to enumerate and is detected as Unknown device.
Is there any special care to be taken for the bootloader to detect and use USB in DFU mode?
