STM32L412RB - Programming

[ronnabh]

Hi, 

Is there an option to program the STM32L412RB with DFU / Serial interface? 
I was programming the STM32F407 with DFU and Serial before and now I want to use the STM32L412RB and program it the same way. 
I can't find any information on the BOOT1 pin in this MCU to enter the system memory boot mode

Thank you in advance for your help, 

Ron. 

[Andrew Neil]

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@ronnabh wrote:

I can't find any information on the BOOT1 pin in this MCU to enter the system memory boot mode

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Here:

https://www.st.com/resource/en/datasheet/stm32l412rb.pdf#page=18

via: https://www.st.com/en/microcontrollers-microprocessors/stm32l412rb.html#documentation

So BOOT1 is an Option Bit - not a pin

[STTwo-32]

Hello @ronnabh and welcome to the ST Community. 
For the STM32L412RB, you will follow the pattern 16 for Bootloader activation (you can find it on the table 2 of the AN2606) no BOOT1 pin to use . Also the paragraph 68 of the AN2606 should give you all details you need.

Best Regards.

STTwo-32

[ronnabh]

Hi, 

Thank you both very much this is very helpful, 

How do I control the Boot1 (bit) ? 

[STTwo-32]

the nBOOT1 is the bit 23 of the FLASH_OPTR register. So, you can set and reset it throw code. Also, you can connect to the STM32CubeProgrammer and go to the option bytes menu to set/reset the nBOOT1 bit. 

Best Regards.

STTwo-32