126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/*
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* This file is part of Cleanflight.
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*
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* Cleanflight is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Cleanflight is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Cleanflight. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdarg.h>
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#include <platform.h>
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#ifdef TRANSPONDER
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#include "build/build_config.h"
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#include "config/parameter_group.h"
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#include "config/parameter_group_ids.h"
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#include "drivers/transponder_ir.h"
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#include "drivers/usb_io.h"
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#include "fc/config.h"
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#include "io/transponder_ir.h"
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PG_REGISTER_WITH_RESET_TEMPLATE(transponderConfig_t, transponderConfig, PG_TRANSPONDER_CONFIG, 0);
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PG_RESET_TEMPLATE(transponderConfig_t, transponderConfig,
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.data = { 0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC } // Note, this is NOT a valid transponder code, it's just for testing production hardware
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);
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static bool transponderInitialised = false;
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static bool transponderRepeat = false;
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// timers
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static timeUs_t nextUpdateAtUs = 0;
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#define JITTER_DURATION_COUNT (sizeof(jitterDurations) / sizeof(uint8_t))
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static uint8_t jitterDurations[] = {0,9,4,8,3,9,6,7,1,6,9,7,8,2,6};
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void transponderUpdate(timeUs_t currentTimeUs)
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{
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static uint32_t jitterIndex = 0;
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if (!(transponderInitialised && transponderRepeat && isTransponderIrReady())) {
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return;
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}
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const bool updateNow = (timeDelta_t)(currentTimeUs - nextUpdateAtUs) >= 0L;
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if (!updateNow) {
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return;
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}
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// TODO use a random number genenerator for random jitter? The idea here is to avoid multiple transmitters transmitting at the same time.
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uint32_t jitter = (1000 * jitterDurations[jitterIndex++]);
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if (jitterIndex >= JITTER_DURATION_COUNT) {
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jitterIndex = 0;
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}
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nextUpdateAtUs = currentTimeUs + 4500 + jitter;
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#ifdef REDUCE_TRANSPONDER_CURRENT_DRAW_WHEN_USB_CABLE_PRESENT
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// reduce current draw when USB cable is plugged in by decreasing the transponder transmit rate.
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if (usbCableIsInserted()) {
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nextUpdateAtUs = currentTimeUs + (1000 * 1000) / 10; // 10 hz.
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}
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#endif
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transponderIrTransmit();
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}
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void transponderInit(void)
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{
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transponderInitialised = transponderIrInit();
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if (!transponderInitialised) {
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return;
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}
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transponderIrUpdateData(transponderConfig()->data);
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}
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void transponderStopRepeating(void)
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{
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transponderRepeat = false;
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}
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void transponderStartRepeating(void)
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{
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if (!transponderInitialised) {
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return;
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}
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transponderRepeat = true;
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}
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void transponderUpdateData(void)
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{
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if (!transponderInitialised) {
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return;
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}
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transponderIrUpdateData(transponderConfig()->data);
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}
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void transponderTransmitOnce(void) {
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if (!transponderInitialised) {
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return;
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}
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transponderIrTransmit();
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}
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#endif
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