kopia lustrzana https://github.com/mobilinkd/tnc3-firmware
133 wiersze
3.5 KiB
C++
133 wiersze
3.5 KiB
C++
// Copyright 2020 Rob Riggs <rob@mobilinkd.com>
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// All rights reserved.
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#pragma once
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#include "PTT.hpp"
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#include "KissHardware.hpp"
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#include "stm32l4xx_hal.h"
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#include "cmsis_os.h"
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#include <cstdint>
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extern osMessageQId hdlcOutputQueueHandle;
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extern osMessageQId dacOutputQueueHandle;
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extern TIM_HandleTypeDef htim7;
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extern DAC_HandleTypeDef hdac1;
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namespace mobilinkd { namespace tnc {
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/**
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* The modulator has three distinct interfaces. The configuration interface
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* which is used to initialize the modulator, the bit sending interface used
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* by the HDLC encoder to transmit the bits, and the modulation interface
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* used by the DAC DMA engine to get the analog values output by the modem.
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*/
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struct Modulator
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{
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virtual ~Modulator() {}
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/**
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* Implement all functionality required to configure the hardware and
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* the modulator. For example, configuring the timer used by the DAC
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* should be done here.
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*/
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virtual void init(const kiss::Hardware& hw) = 0;
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/**
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* Implement all functionality required to deactivate the hardware and
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* the modulator. For example, disabling the timer used by the DAC
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* should be done here.
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*/
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virtual void deinit() = 0;
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virtual void set_gain(uint16_t level) = 0;
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/**
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* Set the PTT controller used by the modulator. It is only legal
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* to call this when the modulator is stopped.
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*
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* @param ptt
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*/
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virtual void set_ptt(PTT* ptt) = 0;
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/**
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* Send a single bit.
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*
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* @param bit
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*/
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virtual void send(bool bit) = 0;
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/// The next three functions are called by the DAC DMA interrupt handler.
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/**
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* Fill the first half of the DAC DMA buffer.
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*
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* @warning This function is called in an interrupt context.
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*
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* @param bit
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*/
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virtual void fill_first(bool bit) = 0;
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/**
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* Fill the second half of the DAC DMA buffer.
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*
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* @warning This function is called in an interrupt context.
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*
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* @param bit
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*/
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virtual void fill_last(bool bit) = 0;
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/**
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* The DAC bit buffer is empty. There are no more bits to process.
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*
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* @warning This function is called in an interrupt context.
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*/
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virtual void empty() = 0;
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virtual void abort() = 0;
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virtual float bits_per_ms() const = 0;
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protected:
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/**
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* Stop the DMA conversion and the timer. Configure DAC for no
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* trigger and set the DAC level to exactly mid-level.
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*
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* @note The DAC is set to mid-level to ensure the audio coupling
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* capacitor is kept biased to ensure that there is no DC level
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* ramp when we start conversions. This is bad for FSK.
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*/
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void stop_conversion()
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{
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HAL_DAC_Stop_DMA(&hdac1, DAC_CHANNEL_1);
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HAL_TIM_Base_Stop(&htim7);
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DAC_ChannelConfTypeDef sConfig;
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sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
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sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
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sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
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sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_ENABLE;
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sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
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if (HAL_DAC_ConfigChannel(&hdac1, &sConfig, DAC_CHANNEL_1) != HAL_OK)
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{
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CxxErrorHandler();
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}
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if (HAL_DAC_SetValue(&hdac1, DAC_CHANNEL_1, DAC_ALIGN_12B_R, 2048) != HAL_OK)
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{
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CxxErrorHandler();
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}
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if (HAL_DAC_Start(&hdac1, DAC_CHANNEL_1) != HAL_OK)
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{
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CxxErrorHandler();
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}
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}
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};
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}} // mobilinkd::tnc
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