Enable VREFBUF on STM32L476Vxx (100 pin LQFP) Solved !

[julien-minet]

Hello,

I searched for a long time how to activate VREFBUF on an L476Vxx (100 pin TQFP). On my board i want to use the internal reference at 2.5V and run the ADCs and DACs. I worked from the definition of the NUCLEO_L476RG board. On this board it is not necessary to activate VREFBUF but on a 100 pin package the activation of VREFBUF becomes mandatory to operate the DACs and ADCs (with the internal reference). The modification is not clean and I don't know how to integrate it into micropython. Currently the code has been added in the stm32/main.c file

At the beginning of the file:

#define VBUFREF
#include "../../lib/stm32lib/STM32L4xx_HAL_Driver/Inc/stm32l4xx_ll_system.h"

and then just after the comment

// At this point everything is fully configured and initialized.
mp_printf(&mp_plat_print, "L476VGT6: VREFBUF overwrite init\n");
SET_BIT(RCC->APB2ENR, RCC_APB2ENR_SYSCFGEN); // needed to modify VREFBUF
LL_VREFBUF_SetVoltageScaling(LL_VREFBUF_VOLTAGE_SCALE1);
LL_VREFBUF_DisableHIZ();
LL_VREFBUF_Enable();

Is there a clean solution to integrate this code into micropython?
Sincerely,
Julian