// Copyright 2013 Emilie Gillet.
//
// Author: Emilie Gillet (emilie.o.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.
//
// Modified for DAC8562 Heikki Paananen (info@asamalab.com)

#include "peaks/drivers/dac.h"

namespace peaks {
  
void Dac::Init() {
  // Initialize SS pin.
  GPIO_InitTypeDef gpio_init;
  gpio_init.GPIO_Pin = kPinSS;
  gpio_init.GPIO_Speed = GPIO_Speed_2MHz;
  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_10MHz;
  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);
  
  wrote_both_channels_ = false;
  
/*
  // Using external 2.5V reference, 2x gain.
  while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));
  GPIO_SetBits(GPIOB, kPinSS);
  GPIO_ResetBits(GPIOB, kPinSS);
  SPI_I2S_SendData(SPI2, 0x2800);
  SPI_I2S_SendData(SPI2, 0x0000);
  while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));
  GPIO_SetBits(GPIOB, kPinSS);
  GPIO_ResetBits(GPIOB, kPinSS);
  SPI_I2S_SendData(SPI2, 0x0200);
  SPI_I2S_SendData(SPI2, 0x0000);
*/
  // Inactivate LDAC
  while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));
  GPIO_SetBits(GPIOB, kPinSS);
  GPIO_ResetBits(GPIOB, kPinSS);
  SPI_I2S_SendData(SPI2, 0x0300);
  SPI_I2S_SendData(SPI2, 0x0300);
}

void Dac::Write(uint16_t channel_1) {
  while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));
  GPIO_SetBits(GPIOB, kPinSS);
  GPIO_ResetBits(GPIOB, kPinSS);
  SPI_I2S_SendData(SPI2, 0x1800 | (channel_1 >> 8));
  SPI_I2S_SendData(SPI2, channel_1 << 8);
}

}  // namespace peaks