radio.c

/* Copyright 2023 Dual Tachyon
 * https://github.com/DualTachyon
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 */

#include "app/dtmf.h"
#include "helper/measurements.h"
#include <string.h>
#if defined(ENABLE_FMRADIO)
#include "app/fm.h"
#endif
#include "audio.h"
#include "bsp/dp32g030/gpio.h"
#include "dcs.h"
#include "driver/bk4819.h"
#include "driver/eeprom.h"
#include "driver/gpio.h"
#include "driver/system.h"
#include "frequencies.h"
#include "functions.h"
#include "helper/battery.h"
#include "misc.h"
#include "radio.h"
#include "settings.h"

VFO_Info_t *gTxVfo;
VFO_Info_t *gRxVfo;
VFO_Info_t *gCurrentVfo;

DCS_CodeType_t gCurrentCodeType;
DCS_CodeType_t gSelectedCodeType;
uint8_t gSelectedCode;

STEP_Setting_t gStepSetting;

VfoState_t VfoState[2];

const char *modulationTypeOptions[5] = {" FM", " AM", "SSB", "BYP", "RAW"};
const char *vfoStateNames[] = {
    "NORMAL", "BUSY", "BAT LOW", "DISABLE", "TIMEOUT", "ALARM", "VOL HIGH",
};
const char *powerNames[] = {"LOW", "MID", "HIGH"};
const char *bwNames[3] = {"  25k", "12.5k", "6.25k"};
const char *deviationNames[] = {"", "+", "-"};

bool RADIO_CheckValidChannel(uint16_t Channel, bool bCheckScanList,
                             uint8_t VFO) {
  uint8_t Attributes;
  uint8_t PriorityCh1;
  uint8_t PriorityCh2;

  if (!IS_MR_CHANNEL(Channel)) {
    return false;
  }

  // Check channel is valid
  Attributes = gMR_ChannelAttributes[Channel];
  if ((Attributes & MR_CH_BAND_MASK) > BAND7_470MHz) {
    return false;
  }

  if (bCheckScanList) {
    switch (VFO) {
    case 0:
      if ((Attributes & MR_CH_SCANLIST1) == 0) {
        return false;
      }
      PriorityCh1 = gEeprom.SCANLIST_PRIORITY_CH1[0];
      PriorityCh2 = gEeprom.SCANLIST_PRIORITY_CH2[0];
      break;
    case 1:
      if ((Attributes & MR_CH_SCANLIST2) == 0) {
        return false;
      }
      PriorityCh1 = gEeprom.SCANLIST_PRIORITY_CH1[1];
      PriorityCh2 = gEeprom.SCANLIST_PRIORITY_CH2[1];
      break;
    default:
      return true;
    }
    if (PriorityCh1 == Channel) {
      return false;
    }
    if (PriorityCh2 == Channel) {
      return false;
    }
  }

  return true;
}

uint8_t RADIO_FindNextChannel(uint8_t Channel, int8_t Direction,
                              bool bCheckScanList, uint8_t VFO) {
  uint8_t i;

  for (i = 0; i <= MR_CHANNEL_LAST; i++) {
    if (Channel == 0xFF) {
      Channel = MR_CHANNEL_LAST;
    } else if (Channel > MR_CHANNEL_LAST) {
      Channel = MR_CHANNEL_FIRST;
    }
    if (RADIO_CheckValidChannel(Channel, bCheckScanList, VFO)) {
      return Channel;
    }
    Channel += Direction;
  }

  return 0xFF;
}

void RADIO_InitInfo(VFO_Info_t *pInfo, uint8_t ChannelSave, uint8_t Band,
                    uint32_t Frequency) {
  memset(pInfo, 0, sizeof(*pInfo));
  pInfo->Band = Band;
  pInfo->SCANLIST1_PARTICIPATION = true;
  pInfo->SCANLIST2_PARTICIPATION = true;
  pInfo->STEP_SETTING = STEP_25_0kHz;
  pInfo->StepFrequency = 2500;
  pInfo->CHANNEL_SAVE = ChannelSave;
  pInfo->FrequencyReverse = false;
  pInfo->OUTPUT_POWER = OUTPUT_POWER_HIGH;
  pInfo->ConfigRX.Frequency = Frequency;
  pInfo->ConfigTX.Frequency = Frequency;
  pInfo->pRX = &pInfo->ConfigRX;
  pInfo->pTX = &pInfo->ConfigTX;
  pInfo->FREQUENCY_OF_DEVIATION = 1000000;

  RADIO_ConfigureSquelchAndOutputPower(pInfo);
}

void RADIO_ConfigureChannel(uint8_t VFO, uint32_t Arg) {
  VFO_Info_t *pRadio;
  uint8_t Channel;
  uint8_t Attributes;
  uint8_t Band;
  bool bParticipation2;
  uint16_t Base;
  uint8_t Data[8];
  uint8_t Tmp;
  uint32_t Frequency;

  pRadio = &gEeprom.VfoInfo[VFO];

  Channel = gEeprom.ScreenChannel[VFO];
  if (IS_VALID_CHANNEL(Channel)) {
    if (IS_MR_CHANNEL(Channel)) {
      Channel = RADIO_FindNextChannel(Channel, RADIO_CHANNEL_UP, false, VFO);
      if (Channel == 0xFF) {
        Channel = gEeprom.FreqChannel[VFO];
        gEeprom.ScreenChannel[VFO] = gEeprom.FreqChannel[VFO];
      } else {
        gEeprom.ScreenChannel[VFO] = Channel;
        gEeprom.MrChannel[VFO] = Channel;
      }
    }
  } else {
    Channel = 205;
  }

  Attributes = gMR_ChannelAttributes[Channel];
  if (Attributes == 0xFF) {
    uint8_t Index;

    if (IS_MR_CHANNEL(Channel)) {
      Channel = gEeprom.FreqChannel[VFO];
      gEeprom.ScreenChannel[VFO] = gEeprom.FreqChannel[VFO];
    }
    Index = Channel - FREQ_CHANNEL_FIRST;
    RADIO_InitInfo(pRadio, Channel, Index, FrequencyBandTable[Index].lower);
    return;
  }

  Band = Attributes & MR_CH_BAND_MASK;
  if (Band > BAND7_470MHz) {
    Band = BAND6_400MHz;
  }

  if (IS_MR_CHANNEL(Channel)) {
    gEeprom.VfoInfo[VFO].Band = Band;
    gEeprom.VfoInfo[VFO].SCANLIST1_PARTICIPATION =
        !!(Attributes & MR_CH_SCANLIST1);
    bParticipation2 = !!(Attributes & MR_CH_SCANLIST2);
  } else {
    Band = Channel - FREQ_CHANNEL_FIRST;
    gEeprom.VfoInfo[VFO].Band = Band;
    bParticipation2 = true;
    gEeprom.VfoInfo[VFO].SCANLIST1_PARTICIPATION = true;
  }
  gEeprom.VfoInfo[VFO].SCANLIST2_PARTICIPATION = bParticipation2;
  gEeprom.VfoInfo[VFO].CHANNEL_SAVE = Channel;

  if (IS_MR_CHANNEL(Channel)) {
    Base = Channel * 16;
  } else {
    Base = 0x0C80 + ((Channel - FREQ_CHANNEL_FIRST) * 32) + (VFO * 16);
  }

  if (Arg == 2 || Channel >= FREQ_CHANNEL_FIRST) {
    EEPROM_ReadBuffer(Base + 8, Data, 8);

    Tmp = Data[3] & 0x0F;
    if (Tmp > 2) {
      Tmp = 0;
    }
    gEeprom.VfoInfo[VFO].FREQUENCY_DEVIATION_SETTING = Tmp;
    gEeprom.VfoInfo[VFO].AM_CHANNEL_MODE = (Data[3] >> 4) & 0b111;

    Tmp = Data[6];
    if (Tmp > STEP_100_0kHz) {
      Tmp = STEP_0_01kHz;
    }
    gEeprom.VfoInfo[VFO].STEP_SETTING = Tmp;
    gEeprom.VfoInfo[VFO].StepFrequency = StepFrequencyTable[Tmp];

    Tmp = Data[7];
    if (Tmp > 10) {
      Tmp = 0;
    }
    gEeprom.VfoInfo[VFO].SCRAMBLING_TYPE = Tmp;
    gEeprom.VfoInfo[VFO].ConfigRX.CodeType = (Data[2] >> 0) & 0x0F;
    gEeprom.VfoInfo[VFO].ConfigTX.CodeType = (Data[2] >> 4) & 0x0F;

    Tmp = Data[0];
    switch (gEeprom.VfoInfo[VFO].ConfigRX.CodeType) {
    case CODE_TYPE_CONTINUOUS_TONE:
      if (Tmp >= 50) {
        Tmp = 0;
      }
      break;
    case CODE_TYPE_DIGITAL:
    case CODE_TYPE_REVERSE_DIGITAL:
      if (Tmp >= 104) {
        Tmp = 0;
      }
      break;
    default:
      gEeprom.VfoInfo[VFO].ConfigRX.CodeType = CODE_TYPE_OFF;
      Tmp = 0;
      break;
    }
    gEeprom.VfoInfo[VFO].ConfigRX.Code = Tmp;

    Tmp = Data[1];
    switch (gEeprom.VfoInfo[VFO].ConfigTX.CodeType) {
    case CODE_TYPE_CONTINUOUS_TONE:
      if (Tmp >= 50) {
        Tmp = 0;
      }
      break;
    case CODE_TYPE_DIGITAL:
    case CODE_TYPE_REVERSE_DIGITAL:
      if (Tmp >= 104) {
        Tmp = 0;
      }
      break;
    default:
      gEeprom.VfoInfo[VFO].ConfigTX.CodeType = CODE_TYPE_OFF;
      Tmp = 0;
      break;
    }
    gEeprom.VfoInfo[VFO].ConfigTX.Code = Tmp;

    if (Data[4] == 0xFF) {
      gEeprom.VfoInfo[VFO].FrequencyReverse = false;
      gEeprom.VfoInfo[VFO].CHANNEL_BANDWIDTH = 0;
      gEeprom.VfoInfo[VFO].OUTPUT_POWER = 2;
      gEeprom.VfoInfo[VFO].BUSY_CHANNEL_LOCK = false;
    } else {
      gEeprom.VfoInfo[VFO].FrequencyReverse = !!(Data[4] & 0x01);
      gEeprom.VfoInfo[VFO].CHANNEL_BANDWIDTH = !!(Data[4] & 0x02);
      gEeprom.VfoInfo[VFO].OUTPUT_POWER = (Data[4] >> 2) & 0x03;
      gEeprom.VfoInfo[VFO].BUSY_CHANNEL_LOCK = !!(Data[4] & 0x10);
    }
    if (Data[5] == 0xFF) {
      gEeprom.VfoInfo[VFO].DTMF_DECODING_ENABLE = false;
      gEeprom.VfoInfo[VFO].DTMF_PTT_ID_TX_MODE = 0;
    } else {
      gEeprom.VfoInfo[VFO].DTMF_DECODING_ENABLE = !!(Data[5] & 1);
      gEeprom.VfoInfo[VFO].DTMF_PTT_ID_TX_MODE = (Data[5] >> 0x01) & 0x03;
    }

    struct {
      uint32_t Frequency;
      uint32_t Offset;
    } Info;

    EEPROM_ReadBuffer(Base, &Info, 8);

    pRadio->ConfigRX.Frequency = Info.Frequency;
    if (Info.Offset >= 100000000) {
      Info.Offset = 1000000;
    }
    gEeprom.VfoInfo[VFO].FREQUENCY_OF_DEVIATION = Info.Offset;
  }

  Frequency = pRadio->ConfigRX.Frequency;

  Band = FREQUENCY_GetBand(Frequency);

  if (Frequency < FrequencyBandTable[Band].lower) {
    pRadio->ConfigRX.Frequency = FrequencyBandTable[Band].lower;
  } else if (Frequency > FrequencyBandTable[Band].upper) {
    pRadio->ConfigRX.Frequency = FrequencyBandTable[Band].upper;
  } else if (Channel >= FREQ_CHANNEL_FIRST) {
    pRadio->ConfigRX.Frequency = FREQUENCY_FloorToStep(
        pRadio->ConfigRX.Frequency, gEeprom.VfoInfo[VFO].StepFrequency,
        FrequencyBandTable[Band].lower);
  }

  if (Frequency >= 10800000 && Frequency <= 13599990) {
    gEeprom.VfoInfo[VFO].FREQUENCY_DEVIATION_SETTING = FREQUENCY_DEVIATION_OFF;
  } else if (!IS_MR_CHANNEL(Channel)) {
    Frequency =
        FREQUENCY_FloorToStep(gEeprom.VfoInfo[VFO].FREQUENCY_OF_DEVIATION,
                              gEeprom.VfoInfo[VFO].StepFrequency, 0);
    gEeprom.VfoInfo[VFO].FREQUENCY_OF_DEVIATION = Frequency;
  }
  RADIO_ApplyOffset(pRadio);
  memset(gEeprom.VfoInfo[VFO].Name, 0, sizeof(gEeprom.VfoInfo[VFO].Name));
  if (IS_MR_CHANNEL(Channel)) {
    // 16 bytes allocated but only 12 used
    EEPROM_ReadBuffer(0x0F50 + (Channel * 0x10), gEeprom.VfoInfo[VFO].Name + 0,
                      8);
    EEPROM_ReadBuffer(0x0F58 + (Channel * 0x10), gEeprom.VfoInfo[VFO].Name + 8,
                      2);
  }

  if (!gEeprom.VfoInfo[VFO].FrequencyReverse) {
    gEeprom.VfoInfo[VFO].pRX = &gEeprom.VfoInfo[VFO].ConfigRX;
    gEeprom.VfoInfo[VFO].pTX = &gEeprom.VfoInfo[VFO].ConfigTX;
  } else {
    gEeprom.VfoInfo[VFO].pRX = &gEeprom.VfoInfo[VFO].ConfigTX;
    gEeprom.VfoInfo[VFO].pTX = &gEeprom.VfoInfo[VFO].ConfigRX;
  }

  if (gEeprom.VfoInfo[VFO].AM_CHANNEL_MODE) {
    gEeprom.VfoInfo[VFO].ModulationType = gEeprom.VfoInfo[VFO].AM_CHANNEL_MODE;
    gEeprom.VfoInfo[VFO].SCRAMBLING_TYPE = 0;
    gEeprom.VfoInfo[VFO].DTMF_DECODING_ENABLE = false;
    gEeprom.VfoInfo[VFO].ConfigRX.CodeType = CODE_TYPE_OFF;
    gEeprom.VfoInfo[VFO].ConfigTX.CodeType = CODE_TYPE_OFF;
  } else {
    gEeprom.VfoInfo[VFO].ModulationType = false;
  }

  RADIO_ConfigureSquelchAndOutputPower(pRadio);
}

void RADIO_ConfigureSquelchAndOutputPower(VFO_Info_t *pInfo) {
  uint8_t Txp[3];
  uint16_t Base;
  FREQUENCY_Band_t Band;

  Band = FREQUENCY_GetBand(pInfo->pRX->Frequency);
  if (Band < BAND4_174MHz) {
    Base = 0x1E60;
  } else {
    Base = 0x1E00;
  }

  if (gEeprom.SQUELCH_LEVEL == 0) {
    pInfo->SquelchOpenRSSIThresh = 0x00;
    pInfo->SquelchOpenNoiseThresh = 0x7F;
    pInfo->SquelchCloseGlitchThresh = 0xFF;
    pInfo->SquelchCloseRSSIThresh = 0x00;
    pInfo->SquelchCloseNoiseThresh = 0x7F;
    pInfo->SquelchOpenGlitchThresh = 0xFF;
  } else {
    Base += gEeprom.SQUELCH_LEVEL;
    EEPROM_ReadBuffer(Base + 0x00, &pInfo->SquelchOpenRSSIThresh, 1);
    EEPROM_ReadBuffer(Base + 0x10, &pInfo->SquelchCloseRSSIThresh, 1);
    EEPROM_ReadBuffer(Base + 0x20, &pInfo->SquelchOpenNoiseThresh, 1);
    EEPROM_ReadBuffer(Base + 0x30, &pInfo->SquelchCloseNoiseThresh, 1);
    EEPROM_ReadBuffer(Base + 0x40, &pInfo->SquelchCloseGlitchThresh, 1);
    EEPROM_ReadBuffer(Base + 0x50, &pInfo->SquelchOpenGlitchThresh, 1);

    if (pInfo->SquelchOpenNoiseThresh >= 0x80) {
      pInfo->SquelchOpenNoiseThresh = 0x7F;
    }
    if (pInfo->SquelchCloseNoiseThresh >= 0x80) {
      pInfo->SquelchCloseNoiseThresh = 0x7F;
    }
  }

  Band = FREQUENCY_GetBand(pInfo->pTX->Frequency);
  EEPROM_ReadBuffer(0x1ED0 + (Band * 0x10) + (pInfo->OUTPUT_POWER * 3), Txp, 3);
  pInfo->TXP_CalculatedSetting = FREQUENCY_CalculateOutputPower(
      Txp[0], Txp[1], Txp[2], FrequencyBandTable[Band].lower,
      (FrequencyBandTable[Band].upper - FrequencyBandTable[Band].lower) / 2,
      FrequencyBandTable[Band].upper, pInfo->pTX->Frequency);
}

uint32_t GetOffsetedF(VFO_Info_t *pInfo, uint32_t f) {
  switch (pInfo->FREQUENCY_DEVIATION_SETTING) {
  case FREQUENCY_DEVIATION_OFF:
    break;
  case FREQUENCY_DEVIATION_ADD:
    f += pInfo->FREQUENCY_OF_DEVIATION;
    break;
  case FREQUENCY_DEVIATION_SUB:
    f -= pInfo->FREQUENCY_OF_DEVIATION;
    break;
  }

  return Clamp(f, FrequencyBandTable[0].lower,
               FrequencyBandTable[ARRAY_SIZE(FrequencyBandTable) - 1].upper);
}

void RADIO_ApplyOffset(VFO_Info_t *pInfo) {
  pInfo->ConfigTX.Frequency = GetOffsetedF(pInfo, pInfo->ConfigRX.Frequency);
}

static void RADIO_SelectCurrentVfo(void) {
  if (gEeprom.CROSS_BAND_RX_TX == CROSS_BAND_OFF) {
    gCurrentVfo = gRxVfo;
  } else {
    gCurrentVfo = &gEeprom.VfoInfo[gEeprom.TX_CHANNEL];
  }
}

void RADIO_SelectVfos(void) {
  if (gEeprom.CROSS_BAND_RX_TX == CROSS_BAND_CHAN_B) {
    gEeprom.TX_CHANNEL = 1;
  } else if (gEeprom.CROSS_BAND_RX_TX == CROSS_BAND_CHAN_A) {
    gEeprom.TX_CHANNEL = 0;
  } else if (gEeprom.DUAL_WATCH == DUAL_WATCH_CHAN_B) {
    gEeprom.TX_CHANNEL = 1;
  } else if (gEeprom.DUAL_WATCH == DUAL_WATCH_CHAN_A) {
    gEeprom.TX_CHANNEL = 0;
  }

  gTxVfo = &gEeprom.VfoInfo[gEeprom.TX_CHANNEL];
  if (gEeprom.CROSS_BAND_RX_TX == CROSS_BAND_OFF) {
    gEeprom.RX_CHANNEL = gEeprom.TX_CHANNEL;
  } else {
    if (gEeprom.TX_CHANNEL == 0) {
      gEeprom.RX_CHANNEL = 1;
    } else {
      gEeprom.RX_CHANNEL = 0;
    }
  }

  gRxVfo = &gEeprom.VfoInfo[gEeprom.RX_CHANNEL];
  RADIO_SelectCurrentVfo();
}

void RADIO_SetupRegisters(bool bSwitchToFunction0) {
  BK4819_FilterBandwidth_t Bandwidth;
  uint16_t Status;
  uint16_t InterruptMask;
  uint32_t Frequency;

  GPIO_ClearBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);
  gEnableSpeaker = false;
  BK4819_ToggleGpioOut(BK4819_GPIO0_PIN28_GREEN, false);

  Bandwidth = gRxVfo->CHANNEL_BANDWIDTH;
  if (Bandwidth != BK4819_FILTER_BW_WIDE) {
    Bandwidth = BK4819_FILTER_BW_NARROW;
  }
  BK4819_SetFilterBandwidth(Bandwidth);

  BK4819_ToggleGpioOut(BK4819_GPIO1_PIN29_RED, false);
  BK4819_SetupPowerAmplifier(0, 0);
  BK4819_ToggleGpioOut(BK4819_GPIO5_PIN1, false);

  while (1) {
    Status = BK4819_ReadRegister(BK4819_REG_0C);
    if ((Status & 1U) == 0) { // INTERRUPT REQUEST
      break;
    }
    BK4819_WriteRegister(BK4819_REG_02, 0);
    SYSTEM_DelayMs(1);
  }
  BK4819_WriteRegister(BK4819_REG_3F, 0);
  BK4819_WriteRegister(BK4819_REG_7D, gEeprom.MIC_SENSITIVITY_TUNING | 0xE94F);
  Frequency = gRxVfo->pRX->Frequency;
  BK4819_SetFrequency(Frequency);
  BK4819_SetupSquelch(
      gRxVfo->SquelchOpenRSSIThresh, gRxVfo->SquelchCloseRSSIThresh,
      gRxVfo->SquelchOpenNoiseThresh, gRxVfo->SquelchCloseNoiseThresh,
      gRxVfo->SquelchCloseGlitchThresh, gRxVfo->SquelchOpenGlitchThresh);
  BK4819_PickRXFilterPathBasedOnFrequency(Frequency);
  BK4819_ToggleGpioOut(BK4819_GPIO6_PIN2, true);
  BK4819_WriteRegister(BK4819_REG_48, 0xB3A8);

  InterruptMask = 0 | BK4819_REG_3F_SQUELCH_FOUND | BK4819_REG_3F_SQUELCH_LOST;

  if (IS_NOT_NOAA_CHANNEL(gRxVfo->CHANNEL_SAVE)) {
    if (!gRxVfo->ModulationType) {
      uint8_t CodeType;
      uint8_t Code;

      CodeType = gSelectedCodeType;
      Code = gSelectedCode;
      if (gCssScanMode == CSS_SCAN_MODE_OFF) {
        CodeType = gRxVfo->pRX->CodeType;
        Code = gRxVfo->pRX->Code;
      }
      switch (CodeType) {
      case CODE_TYPE_DIGITAL:
      case CODE_TYPE_REVERSE_DIGITAL:
        BK4819_SetCDCSSCodeWord(DCS_GetGolayCodeWord(CodeType, Code));
        InterruptMask = 0 | BK4819_REG_3F_CxCSS_TAIL |
                        BK4819_REG_3F_CDCSS_FOUND | BK4819_REG_3F_CDCSS_LOST |
                        BK4819_REG_3F_SQUELCH_FOUND |
                        BK4819_REG_3F_SQUELCH_LOST;
        break;
      case CODE_TYPE_CONTINUOUS_TONE:
        BK4819_SetCTCSSFrequency(CTCSS_Options[Code]);
        BK4819_Set55HzTailDetection();
        InterruptMask = 0 | BK4819_REG_3F_CxCSS_TAIL |
                        BK4819_REG_3F_CTCSS_FOUND | BK4819_REG_3F_CTCSS_LOST |
                        BK4819_REG_3F_SQUELCH_FOUND |
                        BK4819_REG_3F_SQUELCH_LOST;
        break;
      default:
        BK4819_SetCTCSSFrequency(670);
        BK4819_Set55HzTailDetection();
        InterruptMask = 0 | BK4819_REG_3F_CxCSS_TAIL |
                        BK4819_REG_3F_SQUELCH_FOUND |
                        BK4819_REG_3F_SQUELCH_LOST;
        break;
      }
      if (gRxVfo->SCRAMBLING_TYPE == 0 || !gSetting_ScrambleEnable) {
        BK4819_DisableScramble();
      } else {
        BK4819_EnableScramble(gRxVfo->SCRAMBLING_TYPE - 1);
      }
    }
  } else {
    BK4819_SetCTCSSFrequency(2625);
    InterruptMask = 0 | BK4819_REG_3F_CTCSS_FOUND | BK4819_REG_3F_CTCSS_LOST |
                    BK4819_REG_3F_SQUELCH_FOUND | BK4819_REG_3F_SQUELCH_LOST;
  }

  if (gEeprom.VOX_SWITCH
#if defined(ENABLE_FMRADIO)
      && !gFmRadioMode
#endif
      && IS_NOT_NOAA_CHANNEL(gCurrentVfo->CHANNEL_SAVE) &&
      !gCurrentVfo->ModulationType) {
    BK4819_EnableVox(gEeprom.VOX1_THRESHOLD, gEeprom.VOX0_THRESHOLD);
    InterruptMask |= 0 | BK4819_REG_3F_VOX_FOUND | BK4819_REG_3F_VOX_LOST;
  } else {
    BK4819_DisableVox();
  }
  if (gRxVfo->ModulationType || !gRxVfo->DTMF_DECODING_ENABLE) {
    BK4819_DisableDTMF();
  } else {
    BK4819_EnableDTMF();
    InterruptMask |= BK4819_REG_3F_DTMF_5TONE_FOUND;
  }
  BK4819_WriteRegister(BK4819_REG_3F, InterruptMask);
  BK4819_WriteRegister(0x40, (BK4819_ReadRegister(0x40) & ~(0b11111111111)) |
                                 0b10110101010);

  FUNCTION_Init();

  if (bSwitchToFunction0) {
    FUNCTION_Select(FUNCTION_FOREGROUND);
  }
}

void RADIO_SetTxParameters(void) {
  BK4819_FilterBandwidth_t Bandwidth;

  GPIO_ClearBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);

  gEnableSpeaker = false;

  BK4819_ToggleGpioOut(BK4819_GPIO6_PIN2, false);
  Bandwidth = gCurrentVfo->CHANNEL_BANDWIDTH;
  if (Bandwidth != BK4819_FILTER_BW_WIDE) {
    Bandwidth = BK4819_FILTER_BW_NARROW;
  }
  BK4819_SetFilterBandwidth(Bandwidth);
  BK4819_SetFrequency(gCurrentVfo->pTX->Frequency);
  BK4819_PrepareTransmit();
  SYSTEM_DelayMs(10);

  BK4819_PickRXFilterPathBasedOnFrequency(gCurrentVfo->pTX->Frequency);
  BK4819_ToggleGpioOut(BK4819_GPIO5_PIN1, true);
  SYSTEM_DelayMs(5);

  BK4819_SetupPowerAmplifier(gCurrentVfo->TXP_CalculatedSetting,
                             gCurrentVfo->pTX->Frequency);
  SYSTEM_DelayMs(10);

  switch (gCurrentVfo->pTX->CodeType) {
  case CODE_TYPE_CONTINUOUS_TONE:
    BK4819_SetCTCSSFrequency(CTCSS_Options[gCurrentVfo->pTX->Code]);
    break;
  case CODE_TYPE_DIGITAL:
  case CODE_TYPE_REVERSE_DIGITAL:
    BK4819_SetCDCSSCodeWord(DCS_GetGolayCodeWord(gCurrentVfo->pTX->CodeType,
                                                 gCurrentVfo->pTX->Code));
    break;
  default:
    BK4819_ExitSubAu();
    break;
  }
}

void RADIO_SetVfoState(VfoState_t State) {
  if (State == VFO_STATE_NORMAL) {
    VfoState[0] = VFO_STATE_NORMAL;
    VfoState[1] = VFO_STATE_NORMAL;
#if defined(ENABLE_FMRADIO)
    gFM_ResumeCountdown = 0;
#endif
  } else {
    if (State == VFO_STATE_VOL_HIGH) {
      VfoState[0] = VFO_STATE_VOL_HIGH;
      VfoState[1] = VFO_STATE_TX_DISABLE;
    } else {
      uint8_t Channel;

      if (gEeprom.CROSS_BAND_RX_TX == CROSS_BAND_OFF) {
        Channel = gEeprom.RX_CHANNEL;
      } else {
        Channel = gEeprom.TX_CHANNEL;
      }
      VfoState[Channel] = State;
    }
#if defined(ENABLE_FMRADIO)
    gFM_ResumeCountdown = 5;
#endif
  }
  gUpdateDisplay = true;
}

void RADIO_PrepareTX(void) {
  if (gEeprom.DUAL_WATCH != DUAL_WATCH_OFF) {
    gDualWatchCountdown = 360;
    gScheduleDualWatch = false;
    if (!gRxVfoIsActive) {
      gEeprom.RX_CHANNEL = gEeprom.TX_CHANNEL;
      gRxVfo = &gEeprom.VfoInfo[gEeprom.TX_CHANNEL];
    }
    gRxVfoIsActive = true;
  }
  RADIO_SelectCurrentVfo();
#if defined(ENABLE_TX1750)
  if (gAlarmState == ALARM_STATE_OFF
      || gAlarmState == ALARM_STATE_TX1750
  ) {
#else
  if (1) {
#endif
    VfoState_t State;

    if (FREQUENCY_Check(gCurrentVfo)) {
      if (gCurrentVfo->BUSY_CHANNEL_LOCK &&
          gCurrentFunction == FUNCTION_RECEIVE) {
        State = VFO_STATE_BUSY;
      } else if (gBatteryDisplayLevel == 0) {
        State = VFO_STATE_BAT_LOW;
      } else if (gBatteryDisplayLevel == 6) {
        State = VFO_STATE_VOL_HIGH;
      } else {
        goto Skip;
      }
    } else {
      State = VFO_STATE_TX_DISABLE;
    }
    RADIO_SetVfoState(State);
#if defined(ENABLE_TX1750)
    gAlarmState = ALARM_STATE_OFF;
#endif
    AUDIO_PlayBeep(BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL);
    gDTMF_ReplyState = DTMF_REPLY_NONE;
    return;
  }

Skip:
  if (gDTMF_ReplyState == DTMF_REPLY_ANI) {
    if (gDTMF_CallMode == DTMF_CALL_MODE_DTMF) {
      gDTMF_IsTx = true;
      gDTMF_CallState = DTMF_CALL_STATE_NONE;
      gDTMF_TxStopCountdown = 6;
    } else {
      gDTMF_CallState = DTMF_CALL_STATE_CALL_OUT;
      gDTMF_IsTx = false;
    }
  }
  FUNCTION_Select(FUNCTION_TRANSMIT);
#if defined(ENABLE_TX1750)
  if (gAlarmState == ALARM_STATE_OFF) {
    gTxTimerCountdown = gEeprom.TX_TIMEOUT_TIMER * 120;
  } else {
    gTxTimerCountdown = 0;
  }
#else
  gTxTimerCountdown = gEeprom.TX_TIMEOUT_TIMER * 120;
#endif
  gTxTimeoutReached = false;
  gFlagEndTransmission = false;
  gRTTECountdown = 0;
  gDTMF_ReplyState = DTMF_REPLY_NONE;
}

void RADIO_EnableCxCSS(void) {
  switch (gCurrentVfo->pTX->CodeType) {
  case CODE_TYPE_DIGITAL:
  case CODE_TYPE_REVERSE_DIGITAL:
    BK4819_EnableCDCSS();
    SYSTEM_DelayMs(200);
    break;
  case CODE_TYPE_CONTINUOUS_TONE:
    BK4819_EnableCTCSS();
    SYSTEM_DelayMs(200);
    break;
  default:
    break;
  }
}

void RADIO_PrepareCssTX(void) {
  RADIO_PrepareTX();
  SYSTEM_DelayMs(200);
  RADIO_EnableCxCSS();
  RADIO_SetupRegisters(true);
}

void RADIO_SendEndOfTransmission(void) {
  if (gEeprom.ROGER == ROGER_MODE_ROGER) {
    BK4819_PlayRoger();
  } else if (gEeprom.ROGER == ROGER_MODE_MDC) {
    BK4819_PlayRogerMDC();
  }
  if (gDTMF_CallState == DTMF_CALL_STATE_NONE &&
      (gCurrentVfo->DTMF_PTT_ID_TX_MODE == PTT_ID_EOT ||
       gCurrentVfo->DTMF_PTT_ID_TX_MODE == PTT_ID_BOTH)) {
    if (gEeprom.DTMF_SIDE_TONE) {
      GPIO_SetBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);
      gEnableSpeaker = true;
      SYSTEM_DelayMs(60);
    }
    BK4819_EnterDTMF_TX(gEeprom.DTMF_SIDE_TONE);
    BK4819_PlayDTMFString(
        gEeprom.DTMF_DOWN_CODE, 0, gEeprom.DTMF_FIRST_CODE_PERSIST_TIME,
        gEeprom.DTMF_HASH_CODE_PERSIST_TIME, gEeprom.DTMF_CODE_PERSIST_TIME,
        gEeprom.DTMF_CODE_INTERVAL_TIME);
    GPIO_ClearBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);
    gEnableSpeaker = false;
  }
  BK4819_ExitDTMF_TX(true);
}