uart_api.c

См. документацию.

#include "uart_api.h"
 
void UART_SendByte(USART_TypeDef* uart_inst,uint8_t b)
{
    uart_inst->DR = b;
 
    while (!(uart_inst->SR & USART_SR_TC))
    {
    }
}
 
void UART_SendString(USART_TypeDef* uart_inst,const uint8_t *str)
{
    uint16_t k;
 
    k=0;
    while ((str[k]!=0) && (k<UART_MAX_STRING_LENGTH))
    {
        UART_SendByte(uart_inst,str[k]);
        k++;
    }
}
 
uint8_t UART_WaitRxByte(USART_TypeDef* uart_inst)
{
    while (!(uart_inst->SR & USART_SR_RXNE))
    {
    }
 
    return uart_inst->DR;
}
 
void init_uart(USART_TypeDef* uart_inst,const uint32_t baudrate,const uint32_t sys_clk,uint8_t enable_rxne_int)
{
    const float temp_float_baudrate = ((float)sys_clk)/(16.0*baudrate);
    const uint32_t temp_baud_whole = (uint32_t)temp_float_baudrate;
    const uint32_t temp_baud_frac = (temp_float_baudrate - ((float)temp_baud_whole))*16.0;
 
    uart_inst->BRR = (temp_baud_whole<<4) | temp_baud_frac;
 
    if (enable_rxne_int)
    {
        uart_inst->CR1 = USART_CR1_RE | USART_CR1_TE | USART_CR1_RXNEIE | USART_CR1_UE;
    }
    else
    {
        uart_inst->CR1 = USART_CR1_RE | USART_CR1_TE | USART_CR1_UE;
    }
 
    uart_inst->SR = 0;
}