tnc3-firmware/TNC/AudioInput.hpp

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4.3 KiB
C++

// Copyright 2015 Rob Riggs <rob@mobilinkd.com>
// All rights reserved.
#ifndef MOBILINKD__TNC__AUDIO__INPUT_HPP_
#define MOBILINKD__TNC__AUDIO__INPUT_HPP_
#include "main.h"
#include "stm32l4xx_hal.h"
#include "cmsis_os.h"
#include <tuple>
#include <atomic>
#ifdef __cplusplus
extern "C" {
#endif
extern osMessageQId hdlcInputQueueHandle;
extern osMessageQId audioInputQueueHandle;
extern osMessageQId adcInputQueueHandle;
extern TIM_HandleTypeDef htim6;
extern ADC_HandleTypeDef hadc1;
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef*);
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef*);
/**
* This is the long-running audio input task/thread. The ADC can be
* connected to one of 2 inputs:
*
* - AMPLIFIED_AUDIO_IN, ADC1_IN7 -- this is the input used by the demodulator.
* - BATTERY_VOLTAGE -- this is 1/2 raw battery voltage (nominal 1.6-2.1V).
* This input should not be enabled unless BAT_DIVIDER is enabled and
* pulled low.
*
* These inputs can be measured in a couple of different ways:
* - Vavg -- for the average DC level of the signal
* - Vpp -- for the peak-to-peak level of the signal
*
* The outputs can be routed five ways:
*
* 1. KISS output via serial (data or hardware frames)
* 2. AX.25 output via serial (data frames)
* 3. Text output via serial (measurements)
* 4. To another process
* 5. /dev/null
*
* The usual case is that the AMPLIFIED_AUDIO_IN is routed to the
* DEMODULATOR and that output is sent to the serial port as KISS
* output.
*
* Each process monitors the adcState and loops while in that state
* that matches its process. Each combination of ADC source,
* measurement/demodulation and output will have a different adcState.
*
* @param argument is ignored.
*/
void startAudioInputTask(void const * argument);
void TNC_Error_Handler(int dev, int err);
#ifdef __cplusplus
}
namespace mobilinkd { namespace tnc { namespace audio {
constexpr const uint32_t SAMPLE_RATE = 26400;
enum AdcState {
STOPPED, // STOP MODE, wait for comparator
DEMODULATOR, // Demod
STREAM_RAW_INPUT_LEVEL, // Unamplified input levels
STREAM_AMPLIFIED_INPUT_LEVEL, // Amplified input levels
POLL_AMPLIFIED_INPUT_LEVEL, // Amplified input levels
POLL_BATTERY_LEVEL, // Battery level
STREAM_OUTPUT_LEVEL, // Amplified & filtered output levels
AUTO_ADJUST_INPUT_LEVEL, // Automatically adjust input levels
CONFIGURE_INPUT_LEVELS, // Set configured input levels
UPDATE_SETTINGS, // Update the device settings
IDLE, // No DMA; sleep for 10ms
POLL_TWIST_LEVEL,
STREAM_AVERAGE_TWIST_LEVEL,
STREAM_INSTANT_TWIST_LEVEL
};
const size_t ADC_BUFFER_SIZE = 88;
const size_t DMA_TRANSFER_SIZE = ADC_BUFFER_SIZE / 2;
extern uint32_t adc_buffer[]; // Two int16_t samples per element.
inline void stopADC() {
if (HAL_ADC_Stop_DMA(&hadc1) != HAL_OK)
CxxErrorHandler();
if (HAL_TIM_Base_Stop(&htim6) != HAL_OK)
CxxErrorHandler();
}
inline void startADC(uint32_t channel) {
ADC_ChannelConfTypeDef sConfig;
sConfig.Channel = channel;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.SamplingTime = ADC_SAMPLETIME_12CYCLES_5;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
CxxErrorHandler();
if (HAL_TIM_Base_Start(&htim6) != HAL_OK)
CxxErrorHandler();
if (HAL_ADC_Start_DMA(&hadc1, adc_buffer, ADC_BUFFER_SIZE * 2) != HAL_OK)
CxxErrorHandler();
}
inline void restartADC() {
if (HAL_TIM_Base_Start(&htim6) != HAL_OK)
CxxErrorHandler();
if (HAL_ADC_Start_DMA(&hadc1, adc_buffer, ADC_BUFFER_SIZE * 2) != HAL_OK)
CxxErrorHandler();
}
/// Vpp, Vavg, Vmin, Vmax
typedef std::tuple<uint16_t, uint16_t, uint16_t, uint16_t> levels_type;
levels_type readLevels(uint32_t channel, uint32_t samples = 2640);
float readTwist();
void demodulatorTask();
void streamRawInputLevels();
void streamAmplifiedInputLevels();
void pollAmplifiedInputLevel();
void pollBatteryLevel();
void streamOutputLevels();
void stop();
void pollInputTwist();
void streamAverageInputTwist();
void streamInstantInputTwist();
}}} // mobilinkd::tnc::audio
#endif // __cplusplus
#endif // MOBILINKD__TNC__AUDIO__INPUT_HPP_