debug_port.cc
// Copyright 2016 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.
//
// -----------------------------------------------------------------------------
//
// UART driver for conversing with the factory testing program.

#include "plaits/drivers/debug_port.h"

namespace plaits {

void DebugPort::Init() {
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
  
  // Initialize TX and RX pins.
  GPIO_InitTypeDef gpio_init;
  gpio_init.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
  gpio_init.GPIO_Speed = GPIO_Speed_2MHz;
  gpio_init.GPIO_Mode = GPIO_Mode_AF;
  gpio_init.GPIO_OType = GPIO_OType_PP;
  gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOB, &gpio_init);
  
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_7);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_7);
  
  // Initialize USART.
  USART_InitTypeDef usart_init;
  usart_init.USART_BaudRate = 9600;
  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_Mode_Rx;
  USART_Init(USART3, &usart_init);
  
  USART_Cmd(USART3, ENABLE);
}

}  // namespace plaits