dac.cc
// Copyright 2013 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 DAC.

#include "yarns/drivers/dac.h"

#include <algorithm>

namespace yarns {

using namespace std;

const uint16_t kPinSS = GPIO_Pin_12;

void Dac::Init() {
  // Initialize SS pin.
  GPIO_InitTypeDef gpio_init;
  gpio_init.GPIO_Pin = kPinSS;
  gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
  gpio_init.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &gpio_init);
  
  // Initialize MOSI and SCK pins.
  gpio_init.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
  gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
  gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &gpio_init);
  
  // Initialize SPI
  SPI_InitTypeDef spi_init;
  spi_init.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  spi_init.SPI_Mode = SPI_Mode_Master;
  spi_init.SPI_DataSize = SPI_DataSize_16b;
  spi_init.SPI_CPOL = SPI_CPOL_High;
  spi_init.SPI_CPHA = SPI_CPHA_1Edge;
  spi_init.SPI_NSS = SPI_NSS_Soft;
  spi_init.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
  spi_init.SPI_FirstBit = SPI_FirstBit_MSB;
  spi_init.SPI_CRCPolynomial = 7;
  SPI_Init(SPI2, &spi_init);
  SPI_Cmd(SPI2, ENABLE);
  
  fill(&value_[0], &value_[kNumChannels], 0);
  fill(&update_[0], &update_[kNumChannels], false);
  active_channel_ = 0;
}

}  // namespace yarns