uart_logger.cc
// Copyright 2012 Olivier Gillet.
//
// Author: Olivier Gillet (ol.gillet@gmail.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// 
// See http://creativecommons.org/licenses/MIT/ for more information.
//
// -----------------------------------------------------------------------------
//
// Driver for dumping log messages to the UART (TX pin).

#include "braids/drivers/uart_logger.h"

#include <string.h>

namespace braids {

void UartLogger::Init(uint32_t baud_rate) {
  // Initialize TX pin.
  GPIO_InitTypeDef gpio_init;
  gpio_init.GPIO_Pin = GPIO_Pin_9;
  gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
  gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &gpio_init);
  
  // Initialize USART.
  USART_InitTypeDef usart_init;
  usart_init.USART_BaudRate = baud_rate;
  usart_init.USART_WordLength = USART_WordLength_8b;
  usart_init.USART_StopBits = USART_StopBits_1;
  usart_init.USART_Parity = USART_Parity_No;
  usart_init.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  usart_init.USART_Mode = USART_Mode_Tx;
  
  USART_Init(USART1, &usart_init);
  USART_Cmd(USART1, ENABLE);
  
}

void UartLogger::Trace(uint8_t byte) {
  while (!(USART1->SR & USART_FLAG_TXE));
  USART1->DR = byte;
}

}  // namespace braids