Output power not valid with SX126xWaitOnBusy

[ecrin4102]

The sx1261 seems to be timing sensitive during configuration. I have multiple strange behaviors like low power output or bad frequency.

I'm using a custom bord with stm32l152 and I measure output power with an R&S Spectrum Rider FPH (spectrometer 5kHz->3Ghz).

My program mainly come from the ping pong example.

Config 1 :

SX126xWaitOnBusy not implemented
Delay of 1s before and after Radio.SetChannel
==> Works correctly, the power is 14dB and frequency is 868Mhz

Config 2:

SX126xWaitOnBusy implemented
No delay
==> Frequency is OK, but power is reduce to -15dB

Config 3:

SX126xWaitOnBusy not implemented
No delay
==> Power output is Ok but frequency is set to 915Mhz

Here most important part of my code:

Main.c

Radio.Init( &RadioEvents );

      // Delays are mandatory without SX126xWaitOnBusy
//HAL_Delay(1000);
Radio.SetChannel( RF_FREQUENCY );
//HAL_Delay(1000);

Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
LORA_SPREADING_FACTOR, LORA_CODINGRATE,
LORA_PREAMBLE_LENGTH,LORA_FIX_LENGTH_PAYLOAD,
LORA_CRC, 0, 0, LORA_IQ_INVERSION, TX_TIMEOUT_VALUE );

Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD,
LORA_RX_LENGTH_PAYLOAD, LORA_CRC, 0, 0, LORA_IQ_INVERSION, RX_CONTINUOUS );

while (1){
  SetTrame(BufferTx, LORA_TX_LENGTH_PAYLOAD);
  Radio.Send(BufferTx, LORA_TX_LENGTH_PAYLOAD);
  RadioStatus_t status = SX126xGetStatus();
}

sx126X-board.c

void SX126xReset( void ){
	GPIO_InitTypeDef GPIO_InitStruct;

	GPIO_InitStruct.Pin = SX_NRESET_Pin;
	GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
	HAL_GPIO_Init(SX_NRESET_GPIO_Port, &GPIO_InitStruct);
	HAL_Delay(10);

	HAL_GPIO_WritePin(SX_NRESET_GPIO_Port, SX_NRESET_Pin, GPIO_PIN_RESET);
	GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
	HAL_GPIO_Init(SX_NRESET_GPIO_Port, &GPIO_InitStruct);
	HAL_Delay(10);

	GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
	HAL_GPIO_Init(SX_NRESET_GPIO_Port, &GPIO_InitStruct);
}

void SX126xWaitOnBusy( void ){
	while( HAL_GPIO_ReadPin(SX_BUSY_GPIO_Port, SX_BUSY_Pin) == 1 );
}

Anyone have this issue ?