Solved
Setting up a UART caused device reset
I am trying to build a uart implementation from scratch to learn the Stm32, but such a code implementation seems to cause my Stm32F030 to go into Reset_Handler state.
What might be wrong with my code? Thanks in advance!
void uar2_rx_tx_init(void)
{
USART2->CR1 = (USART_CR1_TE | USART_CR1_UE | USART_CR1_RE | USART_CR1_RXNEIE | USART_CR1_TCIE | USART_CR1_TXEIE);
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
RCC-> APB1ENR |= UART2EN;
GPIOA->MODER ^= ~(1U<<6);
GPIOA->MODER |= (1U<<7);
GPIOA->AFR[0] |= (1U<<12);
GPIOA->AFR[0] &= ~(1U<<13);
GPIOA->AFR[0] &= ~(1U<<14);
GPIOA->AFR[0] &= ~(1U<<15);
//USART2->CR3 |= RCC_CFGR3_USART2SW_SYSCLK;
uart_set_baudrate(USART2, APB_FREQ, UART_BAUDRATE);
}
uint16_t uart2_read(void) {
while(!(USART2->ISR & USART_CR1_RXNEIE))
{
}
return USART2->RDR;
}
static void uart_set_baudrate( USART_TypeDef *USARTx, uint32_t PeriphClk, uint32_t BaduRate)
{
USARTx->BRR = compute_set_baudrate(PeriphClk, BaduRate);
//USARTx->BRR = 0x45;
}
static uint32_t compute_set_baudrate(uint32_t PeriphClk, uint32_t BaudRate)
{
return ((PeriphClk + (BaudRate/2U)) / BaudRate) ;
}