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76 lines
1.8 KiB
C++
76 lines
1.8 KiB
C++
/**
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* @file dac.cpp
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* @brief Manages signal creation using the DAC.
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*
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* Copyright (C) 2020 Clyne Sullivan
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*
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* Distributed under the GNU GPL v3 or later. You should have received a copy of
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* the GNU General Public License along with this program.
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* If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "adc.hpp"
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#include "dac.hpp"
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constexpr static const auto dacd = &DACD1;
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constexpr static const auto dacd2 = &DACD2;
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constexpr static const auto gptd = &GPTD7;
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constexpr static const DACConfig dac_config = {
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.init = 0,
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.datamode = DAC_DHRM_12BIT_RIGHT,
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.cr = 0
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};
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constexpr static const DACConversionGroup dac_group_config = {
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.num_channels = 1,
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.end_cb = nullptr,
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.error_cb = nullptr,
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.trigger = DAC_TRG(2)
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};
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constexpr static const GPTConfig gpt_config = {
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.frequency = 36000000,
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.callback = nullptr,
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.cr2 = TIM_CR2_MMS_1, /* TRGO */
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.dier = 0
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};
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static unsigned int dacs_running = 0;
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namespace dac
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{
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void init()
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{
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palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
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palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG);
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dacStart(dacd, &dac_config);
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dacStart(dacd2, &dac_config);
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gptStart(gptd, &gpt_config);
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}
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void write_start(unsigned int channel, dacsample_t *buffer, size_t count)
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{
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if (channel < 2) {
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dacStartConversion(channel == 0 ? dacd : dacd2, &dac_group_config, buffer, count);
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if (dacs_running == 0)
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gptStartContinuous(gptd, adc::get_gpt_divisor());
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dacs_running |= 1 << channel;
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}
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}
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void write_stop(unsigned int channel)
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{
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if (channel < 2) {
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dacStopConversion(channel == 0 ? dacd : dacd2);
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dacs_running &= ~(1 << channel);
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if (dacs_running == 0)
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gptStopTimer(gptd);
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}
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}
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}
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