/******************************************************************************
 * The MIT License
 *
 * Copyright (c) 2010 Bryan Newbold.
 *
 * 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.
 *****************************************************************************/

/**
 * @file dac.h
 * @brief Digital to analog converter header file
 */

/* See notes/dac.txt for more info */

#ifndef _DAC_H_
#define _DAC_H_

#include "rcc.h"

#ifdef __cplusplus
extern "C"{
#endif

/*
 * Register maps
 */

/** DAC register map. */
typedef struct dac_reg_map {
    __io uint32 CR;      /**< Control register */
    __io uint32 SWTRIGR; /**< Software trigger register */
    __io uint32 DHR12R1; /**< Channel 1 12-bit right-aligned data
                              holding register */
    __io uint32 DHR12L1; /**< Channel 1 12-bit left-aligned data
                              holding register */
    __io uint32 DHR8R1;  /**< Channel 1 8-bit left-aligned data
                              holding register */
    __io uint32 DHR12R2; /**< Channel 2 12-bit right-aligned data
                              holding register */
    __io uint32 DHR12L2; /**< Channel 2 12-bit left-aligned data
                              holding register */
    __io uint32 DHR8R2;  /**< Channel 2 8-bit left-aligned data
                              holding register */
    __io uint32 DHR12RD; /**< Dual DAC 12-bit right-aligned data
                              holding register */
    __io uint32 DHR12LD; /**< Dual DAC 12-bit left-aligned data
                              holding register */
    __io uint32 DHR8RD;  /**< Dual DAC 8-bit left-aligned data holding
                              register */
    __io uint32 DOR1;    /**< Channel 1 data output register */
    __io uint32 DOR2;    /**< Channel 2 data output register */
} dac_reg_map;

/** DAC register map base address */
#define DAC_BASE                ((struct dac_reg_map*)0x40007400)

/*
 * Devices
 */

/** DAC device type. */
typedef struct dac_dev {
    dac_reg_map *regs; /**< Register map */
} dac_dev;

extern const dac_dev *DAC;

/*
 * Register bit definitions
 */

/* Control register */
/* Channel 1 control */
#define DAC_CR_EN1                   BIT(0) /* Enable */
#define DAC_CR_BOFF1                 BIT(1) /* Output buffer disable */
#define DAC_CR_TEN1                  BIT(2) /* Trigger enable */
#define DAC_CR_TSEL1             (0x7 << 3) /* Trigger selection */
#define DAC_CR_WAVE1             (0x3 << 6) /* Noise/triangle wave enable */
#define DAC_CR_MAMP1             (0xF << 8) /* Mask/amplitude selector */
#define DAC_CR_DMAEN1               BIT(12) /* DMA enable */
/* Channel 2 control */
#define DAC_CR_EN2                  BIT(16) /* Enable */
#define DAC_CR_BOFF2                BIT(17) /* Output buffer disable */
#define DAC_CR_TEN2                 BIT(18) /* Trigger enable */
#define DAC_CR_TSEL2            (0x7 << 19) /* Trigger selection */
#define DAC_CR_WAVE2            (0x3 << 22) /* Noise/triangle wave generation*/
#define DAC_CR_MAMP2            (0xF << 24) /* Mask/amplitude selector */
#define DAC_CR_DMAEN2               BIT(28) /* DMA enable */

/* Software trigger register */
#define DAC_SWTRIGR_SWTRIG1          BIT(0) /* Channel 1 software trigger */
#define DAC_SWTRIGR_SWTRIG2          BIT(1) /* Channel 2 software trigger */

/* Channel 1 12-bit right-aligned data holding register */
#define DAC_DHR12R1_DACC1DHR     0x00000FFF

/* Channel 1 12-bit left-aligned data holding register */
#define DAC_DHR12L1_DACC1DHR     0x0000FFF0

/* Channel 1 8-bit left-aligned data holding register */
#define DAC_DHR8R1_DACC1DHR      0x000000FF

/* Channel 2 12-bit right-aligned data holding register */
#define DAC_DHR12R2_DACC2DHR     0x00000FFF

/* Channel 2 12-bit left-aligned data holding register */
#define DAC_DHR12L2_DACC2DHR     0x0000FFF0

/* Channel 2 8-bit left-aligned data holding register */
#define DAC_DHR8R2_DACC2DHR      0x000000FF

/* Dual DAC 12-bit right-aligned data holding register */
#define DAC_DHR12RD_DACC1DHR     0x00000FFF
#define DAC_DHR12RD_DACC2DHR     0x0FFF0000

/* Dual DAC 12-bit left-aligned data holding register */
#define DAC_DHR12LD_DACC1DHR     0x0000FFF0
#define DAC_DHR12LD_DACC2DHR     0xFFF00000

/* Dual DAC 8-bit left-aligned data holding register */
#define DAC_DHR8RD_DACC1DHR      0x000000FF
#define DAC_DHR8RD_DACC2DHR      0x0000FF00

/* Channel 1 data output register */
#define DAC_DOR1_DACC1DOR        0x00000FFF

/* Channel 1 data output register */
#define DAC_DOR2_DACC2DOR        0x00000FFF

/*
 * Convenience functions
 */

/* We take the dev argument in these convenience functions for
 * future-proofing */

#define DAC_CH1                         0x1
#define DAC_CH2                         0x2
void dac_init(const dac_dev *dev, uint32 flags);

void dac_write_channel(const dac_dev *dev, uint8 channel, uint16 val);
void dac_enable_channel(const dac_dev *dev, uint8 channel);
void dac_disable_channel(const dac_dev *dev, uint8 channel);

#ifdef __cplusplus
} // extern "C"
#endif

#endif