Hi, I have a STM32G030J6 with a trimpot connected to PA0 (NRST), but I need to disable NRST function. Based on pdf (UM2568) I write this:
<code>
uint32_t nrstmode;
/* Enable Flash access anyway */
__HAL_RCC_FLASH_CLK_ENABLE();
/* Unlock flash */
FLASH->KEYR = FLASH_KEY1;
FLASH->KEYR = FLASH_KEY2;
while((FLASH->CR & FLASH_CR_LOCK) != 0x00);
/* unlock option byte registers */
FLASH->OPTKEYR = 0x08192A3B;
FLASH->OPTKEYR = 0x4C5D6E7F;
while((FLASH->CR & FLASH_CR_OPTLOCK) == FLASH_CR_OPTLOCK);
HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 3, 0xFFFF);
/* get current user option bytes */
nrstmode = (FLASH->OPTR & ~FLASH_OPTR_NRST_MODE);
/* Select sub demo mode */
nrstmode |= OB_RESET_MODE_GPIO;
//nrstmode |= OB_RESET_MODE_INPUT_OUTPUT;
/* Program option bytes */
FLASH->OPTR = nrstmode;
/* Write operation */
FLASH->CR |= FLASH_CR_OPTSTRT;
while((FLASH->SR & FLASH_SR_BSY1) != 0);
/* Force OB Load */
FLASH->CR |= FLASH_CR_OBL_LAUNCH;
</code>
But now my chip is in a infinite reset loop, and I can't connect my st-link to erase/program.
