#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
 
PUTCHAR_PROTOTYPE
{
    HAL_UART_Transmit(&UartHandle, (uint8_t *)&ch, 1, 0xFFFF);
 
    return ch;
}

typedef enum  
{ 
    LOG_LEVEL_OFF=0,
    LOG_LEVEL_INFO, 
    LOG_LEVEL_DEVELOP, 
    LOG_LEVEL_ALL, 
}LOG_LEVEL; 
 
#define log_develop(level,...) do {      if(level>=LOG_LEVEL_DEVELOP)      {     printf("\nFILE:%s LINE:%d,FUNC:%s  ", __FILE__, __LINE__ ,__func__);     printf(##__VA_ARGS__);      } } while (0) 
 
#define log_info(level, ...)  do {     if(level>=LOG_LEVEL_INFO)     printf(##__VA_ARGS__ );  } while (0) 
 
#define log_debug(level, ...) do {      if(level>=LOG_LEVEL_ALL)     printf(##__VA_ARGS__ ); } while (0)

LOG_LEVEL loglevel;//定义打印等级，可以根据自己的实际设定，一般在调试阶段我们设定为LOG_LEVEL_ALL，即所有信息可见。

bool RegionUS915TxConfig( TxConfigParams_t* txConfig, int8_t* txPower, TimerTime_t* txTimeOnAir )
{
    RadioModems_t modem;
    int8_t phyDr = DataratesUS915[txConfig->Datarate];
    int8_t txPowerLimited = LimitTxPower( txConfig->TxPower, NvmCtx.Bands[NvmCtx.Channels[txConfig->Channel].Band].TxMaxPower, txConfig->Datarate, NvmCtx.ChannelsMask );
    uint32_t bandwidth = GetBandwidth( txConfig->Datarate );
    int8_t phyTxPower = 0;
 
    // Calculate physical TX power
    phyTxPower = RegionCommonComputeTxPower( txPowerLimited, txConfig->MaxEirp, txConfig->AntennaGain );
 
    // Setup the radio frequency
    Radio.SetChannel( NvmCtx.Channels[txConfig->Channel].Frequency );
 
    if( txConfig->Datarate == DR_7 )
    { // High Speed FSK channel
        modem = MODEM_FSK;
        Radio.SetTxConfig( modem, phyTxPower, 25000, bandwidth, phyDr * 1000, 0, 5, false, true, 0, 0, false, 4000 );
    }
    else
    {
        modem = MODEM_LORA;
        Radio.SetTxConfig( modem, phyTxPower, 0, bandwidth, phyDr, 1, 8, false, true, 0, 0, false, 4000 );
    }
 
    // Setup maximum payload lenght of the radio driver
    Radio.SetMaxPayloadLength( modem, txConfig->PktLen );
    // Get the time-on-air of the next tx frame
    *txTimeOnAir = Radio.TimeOnAir( modem, txConfig->PktLen );
 
    *txPower = txPowerLimited;
    
    log_info (loglevel, "[%.3fMHz, SF%d ,%ddBm ,%dbyte]",  
                                 Channels[txConfig->Channel].Frequency/1e6, 
                 phyDr, 
                 phyTxPower, 
                     txConfig->PktLen );
    return true;
}
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版权声明：本文为CSDN博主「freemote」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/freemote/article/details/104927220