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/**
* @file dac.cpp
* @brief Manages signal creation using the DAC.
*
* Copyright (C) 2020 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 "adc.hpp" // ADC::getTimerDivisor
#include "dac.hpp"
DACDriver *DAC::m_driver[2] = {
&DACD1, &DACD2
};
GPTDriver *DAC::m_timer = &GPTD7;
int DAC::m_timer_user_count = 0;
const DACConfig DAC::m_config = {
.init = 0,
.datamode = DAC_DHRM_12BIT_RIGHT,
.cr = 0
};
const DACConversionGroup DAC::m_group_config = {
.num_channels = 1,
.end_cb = nullptr,
.error_cb = nullptr,
.trigger = DAC_TRG(2)
};
const GPTConfig DAC::m_timer_config = {
.frequency = 36000000,
.callback = nullptr,
.cr2 = TIM_CR2_MMS_1, /* TRGO */
.dier = 0
};
void DAC::begin()
{
palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG);
dacStart(m_driver[0], &m_config);
dacStart(m_driver[1], &m_config);
gptStart(m_timer, &m_timer_config);
}
void DAC::start(int channel, dacsample_t *buffer, size_t count)
{
if (channel >= 0 && channel < 2) {
dacStartConversion(m_driver[channel], &m_group_config, buffer, count);
if (m_timer_user_count == 0)
gptStartContinuous(m_timer, ADC::getTimerDivisor());
m_timer_user_count++;
}
}
void DAC::stop(int channel)
{
if (channel >= 0 && channel < 2) {
dacStopConversion(m_driver[channel]);
if (--m_timer_user_count == 0)
gptStopTimer(m_timer);
}
}
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