usart.c

/*
 * EGG Electric Unicycle firmware
 *
 * Copyright (C) Casainho, 2015, 2106.
 *
 * Released under the GPL License, Version 3
 */

#include "stm32f10x.h"
#include "gpio.h"
#include "stm32f10x_usart.h"

void usart1_bluetooth_init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  // USART for bluetooth module pins
  GPIO_InitStructure.GPIO_Pin = USART_RX__PIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(USART_RX__PORT, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = USART_TX__PIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(USART_TX__PORT, &GPIO_InitStructure);

  /* Enable GPIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO, ENABLE);

  USART_InitTypeDef USART_InitStructure;
  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USART1, &USART_InitStructure);

  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);
}

unsigned char usart1_send_char (unsigned char c)
{
  while (USART_GetFlagStatus (USART1, USART_FLAG_TXE) == RESET);

  USART_SendData (USART1, c);

  return (c);
}

void usart1_send_str (unsigned char *data)
{
  unsigned char i = 0, r;

  while ((r = data[i++]))
    usart1_send_char (r);
}

unsigned char usart1_receive_char (void)
{
  while (USART_GetFlagStatus (USART1, USART_FLAG_RXNE) == RESET);

  return (USART_ReceiveData (USART1));
}