/**
 * @file dac.cpp
 * @brief Manages signal creation using the DAC.
 *
 * Copyright (C) 2021 Clyne Sullivan
 *
 * Distributed under the GNU GPL v3 or later. You should have received a copy of
 * the GNU General Public License along with this program.
 * If not, see <https://www.gnu.org/licenses/>.
 */

#include "dac.hpp"
#include "sclock.hpp"

DACDriver *DAC::m_driver[2] = {
    &DACD1, &DACD2
};

const DACConfig DAC::m_config = {
    .init = 2048,
    .datamode = DAC_DHRM_12BIT_RIGHT,
    .cr = 0
};

static int dacIsDone = -1;
static void dacEndCallback(DACDriver *dacd)
{
    if (dacd == &DACD2)
        dacIsDone = dacIsBufferComplete(dacd) ? 1 : 0;
}

const DACConversionGroup DAC::m_group_config = {
    .num_channels = 1,
    .end_cb = dacEndCallback,
    .error_cb = nullptr,
#if defined(TARGET_PLATFORM_H7)
    .trigger = 5 // TIM6_TRGO
#elif defined(TARGET_PLATFORM_L4)
    .trigger = 0 // TIM6_TRGO
#endif
};

void DAC::begin()
{
    palSetPadMode(GPIOA, 4, PAL_STM32_MODE_ANALOG);
    palSetPadMode(GPIOA, 5, PAL_STM32_MODE_ANALOG);

    dacStart(m_driver[0], &m_config);
    dacStart(m_driver[1], &m_config);
}

void DAC::start(int channel, dacsample_t *buffer, size_t count)
{
    if (channel >= 0 && channel < 2) {
        if (channel == 1)
            dacIsDone = -1;
        dacStartConversion(m_driver[channel], &m_group_config, buffer, count);
        SClock::start();
    }
}

int DAC::sigGenWantsMore()
{
    if (dacIsDone != -1) {
        int tmp = dacIsDone;
        dacIsDone = -1;
        return tmp;
    } else {
        return -1;
    }
}

int DAC::isSigGenRunning()
{
    return m_driver[1]->state == DAC_ACTIVE;
}

void DAC::stop(int channel)
{
    if (channel >= 0 && channel < 2) {
        dacStopConversion(m_driver[channel]);
        SClock::stop();
    }
}