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[example] Add Nucleo-L552ZE-Q DAC DMA example
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/* | ||
* Copyright (c) 2021, Christopher Durand | ||
* | ||
* This file is part of the modm project. | ||
* | ||
* This Source Code Form is subject to the terms of the Mozilla Public | ||
* License, v. 2.0. If a copy of the MPL was not distributed with this | ||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
*/ | ||
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#include <modm/board.hpp> | ||
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#include <numbers> | ||
#include <cmath> | ||
#include <array> | ||
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using namespace Board; | ||
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constexpr auto computeSinTable(float frequency = 1.f) | ||
{ | ||
std::array<uint16_t, 100> data{}; | ||
constexpr auto HalfOutput = ((1 << 12) - 1) / 2; // 12 bit dac | ||
for (size_t i = 0; i < data.size(); ++i) { | ||
constexpr auto pi = std::numbers::pi_v<float>; | ||
data[i] = HalfOutput * (1 + sin(i * (2 * pi * frequency / data.size()))); | ||
} | ||
return data; | ||
} | ||
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constexpr auto sinTable1 = computeSinTable(1.0f); | ||
constexpr auto sinTable2 = computeSinTable(2.0f); | ||
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// DAC1 channel 1 on GpioA4: switch between 10 kHz and 20 kHz sine signal after DMA transfer complete | ||
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void setupDac() | ||
{ | ||
using Dac = Dac1Dma; | ||
using DacChannel = Dac::Channel1<Dma1::Channel1>; | ||
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Dac::connect<GpioOutputA4::Out1>(); | ||
Dac::initialize(); | ||
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DacChannel::configure(sinTable1.data(), sinTable1.size(), DmaBase::CircularMode::Disabled); | ||
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// trigger source 3: timer 4 for DAC1, see reference manual | ||
DacChannel::setTriggerSource(3); | ||
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// switch between signals when transfer completed | ||
static bool toggleBit = false; | ||
Dma1::Channel1::setTransferCompleteIrqHandler([]() { | ||
DacChannel::stopDma(); | ||
toggleBit = !toggleBit; | ||
if (toggleBit) { | ||
DacChannel::setData(sinTable1.data(), sinTable1.size()); | ||
} else { | ||
DacChannel::setData(sinTable2.data(), sinTable2.size()); | ||
} | ||
DacChannel::startDma(); | ||
}); | ||
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Dma1::Channel1::enableInterruptVector(); | ||
Dma1::Channel1::enableInterrupt(Dma1::InterruptEnable::TransferComplete | | ||
Dma1::InterruptEnable::TransferError); | ||
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DacChannel::startDma(); | ||
DacChannel::enableDacChannel(); | ||
} | ||
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int main() | ||
{ | ||
Board::initialize(); | ||
Leds::setOutput(); | ||
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MODM_LOG_INFO << "DAC DMA Demo" << modm::endl; | ||
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Dma1::enable(); | ||
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setupDac(); | ||
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// configure timer 4 as trigger for DACs | ||
// 110 MHz / 110 = 1 MHz => 1 Msps DAC output | ||
Timer4::enable(); | ||
Timer4::setMode(Timer4::Mode::UpCounter); | ||
Timer4::setPrescaler(1); | ||
Timer4::setOverflow(110 - 1); | ||
Timer4::applyAndReset(); | ||
Timer4::start(); | ||
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// Enable trigger out for timer 4 | ||
TIM4->CR2 |= TIM_CR2_MMS_1; | ||
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while (true) | ||
{ | ||
Leds::toggle(); | ||
modm::delay_ms(500); | ||
} | ||
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return 0; | ||
} |
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<library> | ||
<extends>modm:nucleo-l552ze-q</extends> | ||
<options> | ||
<option name="modm:build:build.path">../../../build/nucleo_l552-ze/dac_dma</option> | ||
</options> | ||
<modules> | ||
<module>modm:debug</module> | ||
<module>modm:platform:dac:1</module> | ||
<module>modm:platform:dma</module> | ||
<module>modm:platform:timer:4</module> | ||
<module>modm:build:scons</module> | ||
</modules> | ||
</library> |