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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/**
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* @file main.cpp
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* @brief Program entry point.
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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 "ch.h"
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#include "hal.h"
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#include "adc.hpp"
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#include "dac.hpp"
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#include "usbserial.hpp"
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#include <array>
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static_assert(sizeof(adcsample_t) == sizeof(uint16_t));
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#if CACHE_LINE_SIZE > 0
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CC_ALIGN(CACHE_LINE_SIZE)
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#endif
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static std::array<adcsample_t, CACHE_SIZE_ALIGN(adcsample_t, 2048)> adc_samples;
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static std::array<dacsample_t, CACHE_SIZE_ALIGN(dacsample_t, 2048)> dac_samples;
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int main()
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{
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halInit();
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chSysInit();
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palSetPadMode(GPIOA, 5, PAL_MODE_OUTPUT_PUSHPULL); // LED
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adc_init();
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dac_init();
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usbserial_init();
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static unsigned int dac_sample_count = 2048;
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while (true) {
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if (usbserial_is_active()) {
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// Expect to receive a byte command 'packet'.
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if (char cmd[3]; usbserial_read(&cmd, 1) > 0) {
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switch (cmd[0]) {
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case 'r': // Read in analog signal
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if (usbserial_read(&cmd[1], 2) < 2)
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break;
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if (auto count = std::min(static_cast<unsigned int>(cmd[1] | (cmd[2] << 8)), adc_samples.size()); count > 0) {
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adc_read(&adc_samples[0], count);
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usbserial_write(adc_samples.data(), count * sizeof(adcsample_t));
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}
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break;
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case 'W':
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if (usbserial_read(&cmd[1], 2) < 2)
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break;
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if (auto count = std::min(static_cast<unsigned int>(cmd[1] | (cmd[2] << 8)), dac_samples.size()); count > 0)
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dac_sample_count = count;
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else
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dac_write_stop();
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break;
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case 'w':
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if (usbserial_read(&dac_samples[0], 2 * dac_sample_count) != 2 * dac_sample_count)
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break;
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dac_write_start(&dac_samples[0], dac_sample_count);
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break;
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case 'i': // Identify ourself as an stmdsp device
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usbserial_write("stmdsp", 6);
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break;
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default:
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break;
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}
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}
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}
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chThdSleepMilliseconds(1);
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}
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}
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