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/**
* @file main.cpp
* @brief Program entry point.
*
* 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 "ch.h"
#include "hal.h"
#include "adc.hpp"
#include "dac.hpp"
#include "elf_load.hpp"
#include "usbserial.hpp"
#include <array>
static_assert(sizeof(adcsample_t) == sizeof(uint16_t));
static_assert(sizeof(dacsample_t) == sizeof(uint16_t));
#if CACHE_LINE_SIZE > 0
CC_ALIGN(CACHE_LINE_SIZE)
#endif
static std::array<adcsample_t, CACHE_SIZE_ALIGN(adcsample_t, 2048)> adc_samples;
#if CACHE_LINE_SIZE > 0
CC_ALIGN(CACHE_LINE_SIZE)
#endif
static std::array<dacsample_t, CACHE_SIZE_ALIGN(dacsample_t, 2048)> dac_samples;
static uint8_t elf_file_store[2048];
static uint8_t elf_exec_store[2048];
static elf::entry_t elf_entry = nullptr;
static volatile bool signal_operate_done = false;
static void signal_operate(adcsample_t *buffer, size_t count);
int main()
{
halInit();
chSysInit();
palSetPadMode(GPIOA, 5, PAL_MODE_OUTPUT_PUSHPULL); // LED
adc::init();
dac::init();
usbserial::init();
static unsigned int dac_sample_count = 2048;
while (true) {
if (usbserial::is_active()) {
// Expect to receive a byte command 'packet'.
if (char cmd[3]; usbserial::read(&cmd, 1) > 0) {
switch (cmd[0]) {
case 'r': // Read in analog signal
if (usbserial::read(&cmd[1], 2) < 2)
break;
if (auto count = std::min(static_cast<unsigned int>(cmd[1] | (cmd[2] << 8)), adc_samples.size()); count > 0) {
adc::read(&adc_samples[0], count);
usbserial::write(adc_samples.data(), count * sizeof(adcsample_t));
}
break;
case 'R':
dac_samples.fill(0);
adc::read_start(signal_operate, &adc_samples[0], adc_samples.size());
dac::write_start(&dac_samples[0], dac_samples.size());
break;
case 's':
while (!signal_operate_done);
usbserial::write(dac_samples.data(), dac_samples.size() * sizeof(adcsample_t));
break;
case 'S':
dac::write_stop();
adc::read_stop();
break;
case 'e':
if (usbserial::read(&cmd[1], 2) < 2)
break;
if (unsigned int count = cmd[1] | (cmd[2] << 8); count < sizeof(elf_file_store)) {
usbserial::read(elf_file_store, count);
elf_entry = elf::load(elf_file_store, elf_exec_store);
}
break;
case 'W':
if (usbserial::read(&cmd[1], 2) < 2)
break;
if (auto count = std::min(static_cast<unsigned int>(cmd[1] | (cmd[2] << 8)), dac_samples.size()); count > 0)
dac_sample_count = count;
else
dac::write_stop();
break;
case 'w':
if (usbserial::read(&dac_samples[0], 2 * dac_sample_count) != 2 * dac_sample_count)
break;
dac::write_start(&dac_samples[0], dac_sample_count);
break;
case 'i': // Identify ourself as an stmdsp device
usbserial::write("stmdsp", 6);
break;
default:
break;
}
}
}
chThdSleepMilliseconds(1);
}
}
void signal_operate(adcsample_t *buffer, size_t count)
{
if (elf_entry)
elf_entry(buffer, count);
auto dac_buffer = &dac_samples[buffer == &adc_samples[0] ? 0 : 1024];
std::copy(buffer, buffer + count, dac_buffer);
signal_operate_done = buffer == &adc_samples[1024];
}
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