Continuous waveform transmission with the STM32WL55JC sub-GHz radio.

[KImlay]

Hi,

I am developing on the Nucleo-wl55jc2 development board and I am trying to program the sub-GHz radio to transmit a continuous wave (not sending data packets, just a waveform). I have attached my code below along with a zip of the project. This code has been simplified from the 'SUBGHZ_Tx_Mode' example program that can be generated using the example selector when generating a new project.

I have tested both the 'SUBGHZ_Tx_Mode' example program and my code with a spectrum analyzer and a software-defined radio, and have not been able to pick up a transmission on either.

Any help is appreciated.

- Kevin

#define RADIO_MODE_STANDBY_RC        0x02
#define RADIO_MODE_BITFIELD          0x70
 
uint8_t RadioCmdSetFreq[4] = {0x1D, 0xCD, 0x65, 0x00};	// 500,000,000
uint8_t RadioResult = 0x00;
uint8_t RadioParam  = 0x00;
uint8_t RadioMode   = 0x00;
uint8_t RadioStatus = 0x00;
 
int main(void)
{
    HAL_Init();
    MX_SUBGHZ_Init();
 
    /* Set Sleep Mode */
	if (HAL_SUBGHZ_ExecSetCmd(&hsubghz, RADIO_SET_SLEEP, &RadioParam, 1) != HAL_OK)
	{
		Error_Handler();
	}
 
	/* Set Standby Mode */
	if (HAL_SUBGHZ_ExecSetCmd(&hsubghz, RADIO_SET_STANDBY, &RadioParam, 1) != HAL_OK)
	{
		Error_Handler();
	}
 
	/* Retrieve Status from SUBGHZ Radio */
	if (HAL_SUBGHZ_ExecGetCmd(&hsubghz, RADIO_GET_STATUS, &RadioResult, 1) != HAL_OK)
	{
		Error_Handler();
	}
	else
	{
		/* Format Mode and Status receive from SUBGHZ Radio */
		RadioMode   = ((RadioResult & RADIO_MODE_BITFIELD) >> 4);
 
		/* Check if SUBGHZ Radio is in RADIO_MODE_STANDBY_RC mode */
		if(RadioMode != RADIO_MODE_STANDBY_RC)
		{
			Error_Handler();
		}
	}
 
	/* Set transmit frequency */
	if (HAL_SUBGHZ_ExecSetCmd(&hsubghz, RADIO_SET_RFFREQUENCY, RadioCmdSetFreq, 4) != HAL_OK)
	{
		Error_Handler();
	}
 
	/* Set Tx Mode with continuous wave */
	if (HAL_SUBGHZ_ExecSetCmd(&hsubghz, RADIO_SET_TXCONTINUOUSWAVE, NULL, 0) != HAL_OK)
	{
		Error_Handler();
	}
 
    while (1)
    { }
}

static void MX_SUBGHZ_Init(void)
{
  hsubghz.Init.BaudratePrescaler = SUBGHZSPI_BAUDRATEPRESCALER_8;
  if (HAL_SUBGHZ_Init(&hsubghz) != HAL_OK)
  {
    Error_Handler();
  }
}