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#include <stm32l476xx.h>
#include <gpio.h>
void serial_init(void)
{
gpio_mode(GPIOA, 2, ALTERNATE);
gpio_mode(GPIOA, 3, ALTERNATE);
GPIOA->AFR[0] &= ~(0x0000FF00);
GPIOA->AFR[0] |= 0x00007700;
RCC->APB1ENR1 |= RCC_APB1ENR1_USART2EN;
// start usart device
USART2->BRR = 80000000L / 115200L;
USART2->CR1 |= USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;
}
void serial_put(int c)
{
while (!(USART2->ISR & USART_ISR_TXE));
USART2->TDR = c & 0xFF;
}
char serial_get(void)
{
while (!(USART2->ISR & USART_ISR_RXNE));
return USART2->RDR & 0xFF;
}
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