Hello. I am using a STM32F070CBT6 uC with the FG-code $36, meaning it should contain bootloader version V10.3.
The chip marking is:
{
STM32
F070CBT6
AA067 019C
TWN AA 016
ST (e3) 2
}
By breaking when the bootloader is running, the HSITRIM register reads as 0 which is compatible with the bug mentioned in AN2606 section 10.3 regarding bootloader version 10.2, but that should have been updated/corrected to 0x16 in bootloader version V10.3 (?)
Registers read while in bootloader (all RCC registers not listed was set to 0)
RCC:CR = 0x30b4403
RCC:CFGR = 0x19000a
RCC:AHBENR = 0x60014
RCC:APB2ENR = 0x1
RCC:APB1ENR = 0x10800100
RCC:BDCR = 0x18
RCC:CSR = 0x1c800000
RCC:CFGR2 = 0x2
RCC:CFGR3 = 0x80
RCC:CR2 = 0x6b80
Bootloader id: 0xA3 (read from address 0x1FFFF6A6)
When accessing the bootloader over USART we get the following information.
stm32flash 0.5
http://stm32flash.sourceforge.net/
Interface serial_posix: 57600 8E1
Version : 0x31
Option 1 : 0x00
Option 2 : 0x00
Device ID : 0x0448 (STM32F070xB/F071xx/F72xx)
- RAM : 16KiB (6144b reserved by bootloader)
- Flash : 128KiB (size first sector: 2x2048)
- Option RAM : 16b
- System RAM : 12KiB
We have a 16,0000MHz crystal connected to pin 5 and 6. (Nothing connected to pin 3 and 4, these are floating)
When we flash our own firmware (via USART) the USB port works flawlessly. But when starting the bootloader to be able to flash via USB, it simply doesn't work - we believe due to the fact that HSITRIM=0.
Do we have the correct boot loader version, and if so - why does it not work when using it?
Please, greatful for any help we can get on this issue.
Best regards /Bjorn
